<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0123-3475</journal-id>
<journal-title><![CDATA[Revista Colombiana de Biotecnología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. colomb. biotecnol]]></abbrev-journal-title>
<issn>0123-3475</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Biotecnología, Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0123-34752010000100013</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Las lipasas: enzimas con potencial para el desarrollo de biocatalizadores inmovilizados por adsorción interfacial]]></article-title>
<article-title xml:lang="en"><![CDATA[Lipases: enzymes having the potential for developing immobilised biocatalysts by interfacial adsorption]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Bacerio]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreno-Medina]]></surname>
<given-names><![CDATA[Víctor Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[del Monte Martínez]]></surname>
<given-names><![CDATA[Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de La Habana Facultad de Biología Centro de Estudio de Proteínas]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de La Habana Facultad de Biología Centro de Estudio de Proteínas]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad de La Habana Facultad de Biología Centro de Estudio de Proteínas]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2010</year>
</pub-date>
<volume>12</volume>
<numero>1</numero>
<fpage>113</fpage>
<lpage>140</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0123-34752010000100013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0123-34752010000100013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0123-34752010000100013&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las lipasas son enzimas con propiedades funcionales muy interesantes que permiten su utilización práctica en diversos campos de las industrias agroquímica, farmacéutica, de detergentes y alimentaria, así como en química fina. Entre las aplicaciones más importantes de estas moléculas se encuentran: la resolución de mezclas racémicas, la obtención de compuestos ópticamente puros y la bioconversión de principios activos. En este trabajo se presenta una amplia revisión del tema, que abarca desde aspectos estructurales y funcionales de las lipasas, hasta la inmovilización de estas enzimas mediante adsorción interfacial y su empleo en biotecnología]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Lipases are enzymes having very interesting functional properties thereby enabling their practical use in different fields related to agro-chemical, pharmaceutical and food industries, as well as in fine chemistry. The most relevant applications for these molecules would be racemic mixture resolution, obtaining optically-pure compounds and the bioconversion of active principles. This work presents a broad review of the topic, ranging from lipases’ structural and functional features to these enzymes’ immobilisation by interfacial adsorption and their use in biotechnology]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[activación interfacial]]></kwd>
<kwd lng="es"><![CDATA[adsorción interfacial]]></kwd>
<kwd lng="es"><![CDATA[bioconversión]]></kwd>
<kwd lng="es"><![CDATA[esterasas]]></kwd>
<kwd lng="en"><![CDATA[Bioconversion]]></kwd>
<kwd lng="en"><![CDATA[esterases]]></kwd>
<kwd lng="en"><![CDATA[interfacial activation]]></kwd>
<kwd lng="en"><![CDATA[interfacial adsorption]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <font face="verdana" size="2">     <p align=right><font face="verdana" size="2"><b>ART&Iacute;CULO DE REVISI&Oacute;N</b></font></p>      <p><font size="3"><b>Las lipasas: enzimas con potencial para el desarrollo de biocatalizadores inmovilizados por adsorci&oacute;n interfacial</b></font></p>       <p><font size="2">Lipases: enzymes having the potential for developing immobilised biocatalysts by interfacial adsorption </font></p>      <p><i>Jorge Gonz&aacute;lez-Bacerio<sup>1</sup> , V&iacute;ctor Ricardo Moreno-Medina<sup>2</sup> , Alberto del Monte Mart&iacute;nez<sup>3</sup> , </i></p>  <hr>      <p><sup>1</sup>Bioqu&iacute;mico, profesor, Centro de Estudio de Prote&iacute;nas, Facultad de Biolog&iacute;a, Universidad de La Habana, Cuba. <a href="mailto:jogoba@fbio.uh.cu">jogoba@fbio.uh.cu</a>    <br>   <sup>2</sup>Microbi&oacute;logo, Centro de Estudio de Prote&iacute;nas, Facultad de Biolog&iacute;a, Universidad de La Habana.    <br>   <sup>3</sup>Autor de correspondencia, bioqu&iacute;mico, profesor e investigador, Centro de Estudio de Prote&iacute;nas, Facultad de Biolog&iacute;a, Universidad de La Habana. <a href="mailto:adelmonte@fbio.uh.cu">adelmonte@fbio.uh.cu</a>        <p>Recibido: septiembre 16 de 2009 Aprobado: junio 23 de 2010  <hr>      <p><b>Resumen</b></p>       ]]></body>
<body><![CDATA[<p>Las lipasas son enzimas con propiedades funcionales muy interesantes que permiten su utilizaci&oacute;n pr&aacute;ctica en diversos campos de las industrias agroqu&iacute;mica, farmac&eacute;utica, de detergentes y alimentaria, as&iacute; como en qu&iacute;mica fina. Entre las aplicaciones m&aacute;s importantes de estas mol&eacute;culas se encuentran: la resoluci&oacute;n de mezclas rac&eacute;micas, la obtenci&oacute;n de compuestos &oacute;pticamente puros y la bioconversi&oacute;n de principios activos. En este trabajo se presenta una amplia revisi&oacute;n del tema, que abarca desde aspectos estructurales y funcionales de las lipasas, hasta la inmovilizaci&oacute;n de estas enzimas mediante adsorci&oacute;n interfacial y su empleo en biotecnolog&iacute;a.</p> <b>Palabras clave</b>: activaci&oacute;n interfacial, adsorci&oacute;n interfacial, bioconversi&oacute;n, esterasas.</p>       <p><b>Abstract</b></p>       <p>Lipases are enzymes having very interesting functional properties thereby enabling their practical use in different fields related to agro-chemical, pharmaceutical and food industries, as well as in fine chemistry. The most relevant applications for these molecules would be racemic mixture resolution, obtaining optically-pure compounds and the bioconversion of active principles. This work presents a broad review of the topic, ranging from lipases’ structural and functional features to these enzymes’ immobilisation by interfacial adsorption and their use in biotechnology.</p>       <p><b>Key words</b>: Bioconversion, esterases, interfacial activation, interfacial adsorption.</p>  <hr>     <p><b>Introducci&oacute;n</b></p>       <p>Las lipasas (glicerol-&eacute;ster hidrolasas; EC 3.1.1.3) son enzimas que catalizan la hidr&oacute;lisis de los enlaces &eacute;ster presentes en los acilgliceroles in vivo. Adem&aacute;s, pueden catalizar la hidr&oacute;lisis o s&iacute;ntesis de un grupo amplio de &eacute;steres carbox&iacute;licos (Bornscheuer <i>et al</i>. 1994). Estas enzimas est&aacute;n ampliamente distribuidas en la naturaleza, y se encuentran en microorganismos, plantas y animales (Berner y Hammond, 1970; Mukherjee, 1996; Ruiz <i>et al</i>., 2007). Una caracter&iacute;stica peculiar de las lipasas es que son enzimas solubles en agua que act&uacute;an sobre sustratos insolubles y agregados, por lo que operan unidas a interfaces l&iacute;pido-agua. Bajo estas condiciones, se produce un incremento de la actividad catal&iacute;tica, respecto a las soluciones con concentraciones por debajo de la concentraci&oacute;n micelar cr&iacute;tica, fen&oacute;meno conocido como activaci&oacute;n interfacial (Sarda y Desnuelle, 1958).</p>       <p>Entre las aplicaciones m&aacute;s exitosas de las enzimas est&aacute;n aquellas que se consiguen con sus formas inmovilizadas. Esto se debe a las ventajas que confiere la inmovilizaci&oacute;n, entre las que se encuentran: la posibilidad de recuperar la enzima del medio de reacci&oacute;n, la obtenci&oacute;n de un producto no contaminado con la enzima, y el incremento de la estabilidad operacional del biocatalizador (Guis&aacute;n <i>et al</i>., 1996a; Malcata, 1996; Kneževic <i>et al</i>., 2004). Uno de los protocolos de inmovilizaci&oacute;n m&aacute;s difundidos para las lipasas es la adsorci&oacute;n selectiva sobre soportes hidrof&oacute;bicos que reproducen las interfaces formadas por los sustratos naturales de estas enzimas (Malcata <i>et al</i>., 1992; Fern&aacute;ndez-Lafuente <i>et al</i>., 1998). En este caso, la inmovilizaci&oacute;n se produce a trav&eacute;s de un mecanismo de adsorci&oacute;n interfacial (Reis <i>et al</i>., 2009), basado en la activaci&oacute;n de estas enzimas en interfaces.</p>       <p>Las lipasas han suscitado un inter&eacute;s creciente para la industria debido a su versatilidad, estereoselectividad, estabilidad frente a solventes org&aacute;nicos y capacidad de sintetizar compuestos org&aacute;nicos en mezclas de reacci&oacute;n con baja actividad de agua (Segura <i>et al</i>., 2004; Dandavate <i>et al</i>., 2009). Bajo determinadas condiciones, las lipasas pueden catalizar reacciones qu&iacute;micas distintas de la hidr&oacute;lisis, como esterificaci&oacute;n, interesterificaci&oacute;n, alcoholisis, acidolisis y aminolisis (Balcão <i>et al</i>., 1996; Pandey <i>et al</i>., 1999). Estas hidrolasas se han empleado ampliamente como aditivos para detergentes, en las industrias alimentaria, papelera, qu&iacute;mica y energ&eacute;tica; as&iacute; como para la producci&oacute;n de cosm&eacute;ticos, en tratamientos ambientales y en el dise&ntilde;o de biosensores (MacRae y Hammond, 1995). Es notable el impacto que han tenido las lipasas en la producci&oacute;n de f&aacute;rmacos m&aacute;s selectivos y efectivos, con efectos secundarios menores, y en la obtenci&oacute;n de pesticidas de menor toxicidad, todo ello mediante la s&iacute;ntesis de compuestos &oacute;pticamente puros y la resoluci&oacute;n de mezclas rac&eacute;micas (Kirchner <i>et al</i>., 1985; Yoshimura <i>et al</i>., 2002; Zarev&uacute;cka y Wimmer, 2008). Es por ello que cobra vital importancia profundizar en el conocimiento sobre las caracter&iacute;sticas funcionales de estas enzimas, a fin de determinar las condiciones m&aacute;s ventajosas de aprovechamiento de sus propiedades, para lograr la optimizaci&oacute;n de los procesos en que son empleadas.</p>       <p>En este trabajo se presentan los resultados de una amplia revisi&oacute;n en la literatura especializada sobre las lipasas. En primer lugar, se ofrecen las caracter&iacute;sticas estructurales m&aacute;s importantes de estas enzimas en relaci&oacute;n con las peculiares propiedades funcionales que estas determinan. A continuaci&oacute;n se presenta la inmovilizaci&oacute;n de lipasas como tecnolog&iacute;a dirigida a la obtenci&oacute;n de biocatalizadores m&aacute;s eficientes, con &eacute;nfasis en la inmovilizaci&oacute;n por adsorci&oacute;n interfacial: uno de los procedimientos de inmovilizaci&oacute;n m&aacute;s difundidos para estas prote&iacute;nas. Por &uacute;ltimo, se resumen las principales aplicaciones biotecnol&oacute;gicas de las lipasas.</p>       <p><b>Masa molecular y punto isoel&eacute;ctrico</b></p>       ]]></body>
<body><![CDATA[<p>La mayor&iacute;a de las lipasas presenta masas moleculares entre 27 y 60 kDa. Sin embargo, se conocen algunos ejemplos de lipasas con masas moleculares ubicadas fuera de este intervalo. Los puntos isoel&eacute;ctricos que se han informado para la mayor parte de las enzimas e isoenzimas de diversos or&iacute;genes se encuentran entre 3,8 y 7,3 (<a href="#t1">tabla 1</a>).</p>      <p align="center"><a name="t1"><img src="img/revistas/biote/v12n1/v12n1a13t1.JPG">       <p><b>Plegamiento y amino&aacute;cidos catal&iacute;ticos</b></p>       <p>La lipasas presentan un dominio estructural can&oacute;nico compuesto por ocho cadenas &Beta; que forman una hoja &Beta;. Estas cadenas est&aacute;n conectadas por h&eacute;lices &alpha;, que quedan empaquetadas a ambos lados de la hoja &Beta;. Este n&uacute;cleo central es el responsable directo de la actividad catal&iacute;tica y define el plegamiento a/&Beta;-hidrolasa, com&uacute;n para muchas hidrolasas de or&iacute;genes filogen&eacute;ticos y funciones catal&iacute;ticas diferentes (Ollis <i>et al</i>., 1992).</p>       <p>La actividad funcional de las lipasas se sustenta en la tr&iacute;ada de amino&aacute;cidos cl&aacute;sica: nucle&oacute;filo-&aacute;cido-histidina (Alam <i>et al</i>., 2002; Mead <i>et al</i>., 2002), dilucidada inicialmente para las proteasas ser&iacute;nicas (Carter y Wells, 1988). Los elementos de la tr&iacute;ada se ubican en lazos muy bien conservados del dominio catal&iacute;tico. El nucle&oacute;filo, generalmente una serina, se localiza en un giro que conecta una cadena &Beta; con una h&eacute;lice a (Petersen, 1996), en el contexto secuencial peque&ntilde;o-x-nucle&oacute;filo-x-peque&ntilde;opeque&ntilde;o; donde x es cualquier amino&aacute;cido y “peque&ntilde;o” se refiere a un amino&aacute;cido poco voluminoso (Ransac <i>et al</i>., 1996). Solo la histidina est&aacute; completamente conservada en la tr&iacute;ada de las lipasas (Derewenda <i>et al</i>., 1994a), cuyo arreglo topol&oacute;gico y secuencial es la imagen especular de la tr&iacute;ada de las proteasas ser&iacute;nicas (Ollis <i>et al</i>., 1992) (<a href="#f1">figura 1</a>).</p>       <p align="center"><a name="f1"><img src="img/revistas/biote/v12n1/v12n1a13f1.JPG">       <p><b>Centro activo</b></p>       <p>El centro activo de las lipasas permanece protegido por una cubierta que impide la entrada del sustrato. Este solo tiene acceso cuando la enzima se encuentra en su conformaci&oacute;n activa y la cubierta se ha desplazado (Derewenda <i>et al</i>., 1994b; Miled <i>et al</i>., 2003). Esta cubierta puede ser una h&eacute;lice a anfif&iacute;lica (Lotti y Alberghina, 1996) o un lazo (Hui y Howles, 2002). La estructura nativa de las lipasas es un sistema din&aacute;mico de interconversi&oacute;n entre la estructura cerrada, que predomina en ambientes homog&eacute;neos, y la estructura abierta, que se estabiliza en las interfaces l&iacute;pido-agua (Grochulski <i>et al</i>., 1994a; Guis&aacute;n <i>et al</i>., 1996a). Las estructuras tridimensionales de algunas lipasas en sus conformaciones activas se han determinado por cristalograf&iacute;a y difracci&oacute;n de rayos X (Derewenda <i>et al</i>., 1994b; Kim <i>et al</i>., 1997; Tyndall <i>et al</i>., 2002; Ericsson <i>et al</i>., 2008).</p>       <p>Adem&aacute;s del centro activo principal, las lipasas pancre&aacute;ticas humana y porcina, y otras de origen microbiano, presentan en su regi&oacute;n C-terminal lo que parece ser un sitio catal&iacute;tico m&iacute;nimo. Este pudiera ser responsable de la actividad enzim&aacute;tica frente a sustratos hidrosolubles como los &eacute;steres del <i>p</i>-nitrofenol (De Caro <i>et al</i>. 1986). Por otra parte, esta actividad tambi&eacute;n pudiera explicarse por las transiciones conformacionales que experimentan estas enzimas, aun en ambientes homog&eacute;neos, dadas por la interconversi&oacute;n estructura cerrada-estructura abierta (Kim <i>et al</i>., 1997).</p>       <p>En su conformaci&oacute;n activa, las lipasas presentan en su centro activo un grupo de residuos hidrof&oacute;bicos dispuestos alrededor de la serina catal&iacute;tica que constituyen una regi&oacute;n electrof&iacute;lica conocida como cavidad oxiani&oacute;nica (Grochulski <i>et al</i>., 1994b). Adem&aacute;s, aparece una superficie significativamente apolar alrededor de la entrada al centro activo que se conoce como zona de contacto lip&iacute;dico (Okkels <i>et al</i>., 1996). Tambi&eacute;n est&aacute;n presentes algunas mol&eacute;culas de agua que participan en interacciones importantes para mantener una conformaci&oacute;n del sitio activo catal&iacute;ticamente competente (Triantafyllou <i>et al</i>., 1993).</p>       ]]></body>
<body><![CDATA[<p><b>Activaci&oacute;n interfacial</b></p>       <p>De manera general, las lipasas son enzimas que requieren de activaci&oacute;n interfacial para desplegar al m&aacute;ximo su actividad catal&iacute;tica (Malcata, 1996; Ransac <i>et al</i>., 1996). Este fen&oacute;meno consiste en el incremento de la actividad enzim&aacute;tica en presencia de interfaces l&iacute;pidoagua (Sarda y Desnuelle, 1958; Chahinian et al., 2002). Se entiende por interface a la superficie imaginaria que separa dos porciones del espacio homog&eacute;neas y distintas f&iacute;sicamente. A nivel molecular, una interface consiste en un conjunto de dos capas adyacentes de mol&eacute;culas ordenadas con diferente car&aacute;cter hidrof&oacute;bicohidrof&iacute;lico (Malcata, 1996).</p>       <p>Cuando la enzima entra en contacto con una interface, el ambiente diel&eacute;ctrico en la superficie proteica se modifica, en el sentido de potenciar las interacciones electrost&aacute;ticas. Ello posibilita que la cubierta del centro activo se desplace (Grochulski <i>et al</i>., 1994a; Petersen, 1996; Foresti y Ferreira, 2004), y se produce una reestructuraci&oacute;n en la conformaci&oacute;n de la mol&eacute;cula (Jensen <i>et al</i>., 2002; Aloulou <i>et al</i>., 2006; Lin <i>et al</i>., 2007). Como resultado, los amino&aacute;cidos catal&iacute;ticos quedan expuestos al solvente en una orientaci&oacute;n adecuada, y alrededor de &eacute;stos se conforma la cavidad oxiani&oacute;nica, por exposici&oacute;n de determinados residuos hidrof&oacute;bicos e internalizaci&oacute;n de otros hidrof&iacute;licos (Ransac et al., 1996). Adem&aacute;s, se estructura la zona de contacto lip&iacute;dico en la vecindad del centro activo y de la cubierta m&oacute;vil (Grochulski <i>et al</i>., 1994a; Jensen <i>et al</i>., 2002). Todo esto incrementa la afinidad de la enzima por sus sustratos lip&iacute;dicos y contribuye a la estabilizaci&oacute;n del estado de transici&oacute;n durante el ciclo catal&iacute;tico (Malcata, 1996; Ransac <i>et al</i>., 1996; Mead <i>et al</i>., 2002).</p>       <p>Las caracter&iacute;sticas f&iacute;sico-qu&iacute;micas del sustrato tambi&eacute;n contribuyen de manera significativa a la activaci&oacute;n interfacial (Egmond, 1996). En el estado agregado, los triacilglic&eacute;ridos exhiben un grado de ordenamiento elevado, que minimiza el n&uacute;mero de estados conformacionales que pueden presentar estas mol&eacute;culas en soluci&oacute;n acuosa, debido a la gran flexibilidad de sus cadenas de &aacute;cidos grasos. Este efecto tiene implicaciones favorables para el reconocimiento enzima-sustrato (Petersen, 1996) (<a href="#f2">figura 2</a>).</p>      <p align="center"><a name="f2"><img src="img/revistas/biote/v12n1/v12n1a13f2.JPG">       <p><b>Agregaci&oacute;n molecular</b></p>       <p>Dado el car&aacute;cter hidrof&oacute;bico de la zona de contacto lip&iacute;dico cercana al centro activo, no es descartable su interacci&oacute;n con otras sustancias de su misma naturaleza presentes en el medio, incluyendo las zonas hidrof&oacute;bicas de otras mol&eacute;culas de enzima. Estas interacciones conducir&iacute;an a la formaci&oacute;n de agregados (Snellman <i>et al</i>., 2002) con baja o ninguna actividad catal&iacute;tica, debido al bloqueo de los centros activos por las propias mol&eacute;culas enzim&aacute;ticas. El fen&oacute;meno de agregaci&oacute;n en soluciones acuosas ha sido demostrado experimentalmente por varios grupos de investigadores (Flaschel y Renken, 1991; Guis&aacute;n <i>et al</i>., 1996b; Palomo <i>et al</i>., 2003), los que obtuvieron un r&aacute;pido descenso de la actividad enzim&aacute;tica al aumentar la concentraci&oacute;n de enzima (Pedersen <i>et al</i>., 2006).</p>       <p><b>Especificidad y selectividad</b></p>       <p>Si bien las lipasas han sido definidas como enzimas espec&iacute;ficas para catalizar la separaci&oacute;n hidrol&iacute;tica de los &aacute;cidos grasos de cadena larga presentes en los acilgliceroles (Snellman <i>et al</i>., 2002), los cuales son sus sustratos naturales, muy pocas lipasas son espec&iacute;ficas en sus reacciones. Por este motivo, el t&eacute;rmino especificidad se ha ido reemplazando en la literatura por el de selectividad, el cual describe mucho mejor el comportamiento reactivo de estas hidrolasas. En &uacute;ltima instancia, la determinaci&oacute;n de la especificidad de una lipasa depende de la sensibilidad del m&eacute;todo empleado para ello (Jensen y Hamosh, 1996).</p>       <p>Las lipasas pueden ser selectivas por la clase de l&iacute;pido (Bornscheuer <i>et al</i>., 1994; Li <i>et al</i>., 2009) y por la posici&oacute;n (Berner y Hammond, 1970) y el tipo de &aacute;cido graso (Snellman <i>et al</i>., 2002; Zouari <i>et al</i>., 2005). Estas enzimas pueden ser adem&aacute;s estereoselectivas (Cygler <i>et al</i>., 1995), y alcanzan a distinguir entre enanti&oacute;meros, frente a sustratos rac&eacute;micos, o entre grupos enantiot&oacute;picos, para triacilglic&eacute;ridos proquirales (Bornscheuer 2002). Por &uacute;ltimo, pueden establecerse ciertas combinaciones entre los tipos de selectividades anteriores (Jensen <i>et al</i>., 1994).</p>       ]]></body>
<body><![CDATA[<p><b>Efecto de la concentraci&oacute;n de sustrato sobre la actividad enzim&aacute;tica</b></p>       <p>El efecto de la concentraci&oacute;n de sustrato sobre la actividad lipasa ha sido ensayado con diferentes sustratos para enzimas de diversas fuentes. En la <a href="#t2">tabla 2</a> se presentan algunos resultados que se han informado para lipasas en sus formas solubles.</p>     <p align="center"><a name="t2"><img src="img/revistas/biote/v12n1/v12n1a13t2.JPG">       <p>El efecto de la concentraci&oacute;n de sustrato sobre la actividad enzim&aacute;tica tambi&eacute;n se ha evaluado para lipasas inmovilizadas. En esos casos, se obtienen valores aparentes de los par&aacute;metros cin&eacute;ticos, ya que estos se encuentran sesgados por las condiciones de la inmovilizaci&oacute;n (Tutar <i>et al</i>., 2009).</p>       <p><b>Efecto del pH y la temperatura sobre la actividad enzim&aacute;tica</b></p>       <p>Las condiciones &oacute;ptimas de pH dependen, entre otros factores, del sustrato (Berner y Hammond, 1970) y del tamp&oacute;n empleados (Ch&aacute;vez <i>et al</i>., 1990). El pH &oacute;ptimo para las lipasas se encuentra generalmente en el intervalo entre 7,0 y 9,0 (<a href="#t3">tabla 3</a>), cuando la actividad enzim&aacute;tica se ensaya frente a sus sustratos espec&iacute;ficos, como el aceite de oliva, la tributirina, otros triacilglic&eacute;ridos peque&ntilde;os y la triole&iacute;na (R&uacute;a <i>et al</i>., 1993; Prazeres et al., 1996). No obstante, para algunas lipasas, el pH &oacute;ptimo se encuentra en la regi&oacute;n ac&iacute;dica. Asimismo, se han encontrado lipasas con la mayor actividad a valores de pH m&aacute;s alcalinos (<a href="#t3">tabla 3</a>).</p>       <p align="center"><a name="t3"><img src="img/revistas/biote/v12n1/v12n1a13t3.JPG">        <p>Tambi&eacute;n puede suceder que se obtenga m&aacute;s de un valor de pH &oacute;ptimo, manteniendo invariables las dem&aacute;s condiciones del ensayo (Kiyotani <i>et al</i>., 1983). Esto suele ocurrir para lipasas obtenidas a partir de extractos crudos o para mezclas heterog&eacute;neas con actividad lipol&iacute;tica (Berner y Hammond, 1970). La inmovilizaci&oacute;n puede variar el valor de pH &oacute;ptimo de las lipasas con respecto a sus formas solubles (Wei y Wu, 2008), en dependencia del grado de exposici&oacute;n resultante de sus centros activos (Balcão <i>et al</i>., 1996).</p>       <p>La temperatura &oacute;ptima para una enzima depende, entre otros factores, del sustrato con el que se trabaje, ya que los ligandos ejercen un efecto protector frente a la desnaturalizaci&oacute;n t&eacute;rmica (Ch&aacute;vez <i>et al</i>., 1990). La temperatura &oacute;ptima para las lipasas puede encontrarse en el intervalo entre 35 y 50 °C, aunque existen lipasas termoestables que exhiben valores de temperatura &oacute;ptima superiores a 50 °C (<a href="#t1">tabla 1</a>).</p>       <p>El medio en el que se encuentre la enzima tambi&eacute;n influye en el valor de temperatura &oacute;ptima. De este modo, las lipasas presentes en preparados crudos, con altas concentraciones de otras prote&iacute;nas contaminantes distintas de las proteasas, ser&aacute;n m&aacute;s estables y exhibir&aacute;n valores aparentes de temperatura &oacute;ptima superiores (Ch&aacute;vez <i>et al</i>., 1990). La inmovilizaci&oacute;n puede producir incrementos en los valores de temperatura &oacute;ptima de las lipasas solubles (Palomo <i>et al</i>., 2004; Wei y Wu, 2008), debido a su efecto sobre la estabilidad enzim&aacute;tica (Balcão <i>et al</i>., 1996).</p>       ]]></body>
<body><![CDATA[<p><b>Inhibidores, inhibici&oacute;n y efecto de aditivos sobre la actividad enzim&aacute;tica</b></p>       <p>Las lipasas son inhibidas por los organofosfatos (Kordel y Schmid, 1991; Cavalier <i>et al</i>., 2000), como el dietil-/-nitrofenilfosfato y el diisopropil-fluorofosfato (Bhardwaj et al., 2001), por las carbodiimidas en presencia de nucle&oacute;filos, como el glicin-etil &eacute;ster, y por el iodo. Tambi&eacute;n son inhibidores de lipasas los &aacute;cidos bor&oacute;nicos y el fenil-metil-sulfonilfluoruro (Dandavate <i>et al</i>., 2009), as&iacute; como los metales pesados, el EDTA (Snellman <i>et al</i>., 2002; Dandavate <i>et al</i>., 2009), algunos terpenos (Morikawa <i>et al</i>., 2009), los iones hal&oacute;genos, los alcaloides, el cloroformo, el n-hexanol, el dietil-fenil carbonato, el bromoformo, varias lactonas (Colowick y Kaplan, 1955; Kordel y Schmid, 1991) y algunos 1,2-etilen-di-N-alquilcarbamatos en presencia de detergentes (Lin et al., 2007). Algunos cationes met&aacute;licos pueden producir inhibici&oacute;n (Wu <i>et al</i>., 1996; Snellman <i>et al</i>., 2002; Park <i>et al</i>., 2008; Dandavate <i>et al</i>., 2009).</p>       <p>Los inhibidores de naturaleza proteica son m&aacute;s espec&iacute;ficos por su lipasa blanco, como es el caso del aislado a partir de la harina de trigo, que inhibi&oacute; a la lipasa pancre&aacute;tica, pero no fue capaz de inhibir completamente la actividad lipasa de <i>Candida cylindracea</i> y no ejerci&oacute; ning&uacute;n efecto sobre otras lipasas aisladas de micobacterias (Tani <i>et al</i>., 1994). Algunas prote&iacute;nas hidrof&oacute;bicas, como la alb&uacute;mina de suero bovino, inhiben a las lipasas mediante su uni&oacute;n competitiva a las interfaces (Larsson y Erlanson-Albertsson, 1983). Para varias lipasas se han informado los fen&oacute;menos de inhibici&oacute;n por exceso de sustrato, frente a triole&iacute;na (Biesiot y Capuzzo, 1990; Prazeres <i>et al</i>., 1996), e inhibici&oacute;n por producto, causado por los &aacute;cidos grasos (Larsson y Erlanson-Albertsson, 1983). Los detergentes (Tsai <i>et al</i>., 1996; Brockman, 2000) y las emulsiones de varios solventes org&aacute;nicos (Sugiura e Isobe, 1975) pueden actuar como inhibidores de las lipasas. Algunos autores han informado inhibici&oacute;n competitiva causada por concentraciones elevadas de detergentes (Kimura <i>et al</i>., 1982).</p>       <p>La actividad lipasa puede ser afectada de diferentes maneras por la presencia de iones met&aacute;licos en la preparaci&oacute;n, los que pueden estabilizar o desestabilizar la estructura de estas enzimas en soluci&oacute;n (Tyndall <i>et al</i>., 2002). Muchas lipasas requieren del ion Ca<sup>2+</sup> para mantener una conformaci&oacute;n estable y/o catal&iacute;ticamente competente (Amada <i>et al</i>., 2001; Snellman <i>et al</i>., 2002). Adem&aacute;s del efecto inhibitorio ya mencionado, los cationes met&aacute;licos tambi&eacute;n pueden actuar como activadores de las lipasas (Kimura <i>et al</i>., 1982; Snellman <i>et al</i>., 2002; Dandavate <i>et al</i>., 2009). El efecto activador del Ca2+ puede manifestarse como un incremento de la Vm&aacute;x y/o un decremento de la KM (Kimura <i>et al</i>., 1982). Algunos iones provocan efectos opuestos en lipasas diferentes (Wu <i>et al</i>., 1996; Snellman <i>et al</i>., 2002). Tambi&eacute;n pueden influir sobre la actividad de estas enzimas el tamp&oacute;n (Alston y Freedman, 2001), el solvente (Sugiura e Isobe, 1975; Triantafyllou <i>et al</i>., 1993; Sharma <i>et al</i>., 2002; Dandavate <i>et al</i>., 2009) y la fuerza i&oacute;nica del medio (Mead <i>et al</i>., 2002). El efecto inhibitorio del EDTA se basa en su capacidad de quelar el Ca2+.</p>       <p>Los detergentes o surfactantes son aditivos de primera importancia para la actividad lipol&iacute;tica (Dandavate <i>et al</i>., 2009), puesto que intervienen en la formaci&oacute;n de micelas a partir de la dispersi&oacute;n de los grandes agregados hidrof&oacute;bicos en que se organizan espont&aacute;neamente los sustratos naturales de estas enzimas en soluci&oacute;n acuosa. Esto trae como consecuencia un incremento notable del &aacute;rea superficial disponible para la interacci&oacute;n enzima-sustrato, con el consiguiente efecto sobre la velocidad de la reacci&oacute;n (Egmond, 1996). Estas sustancias pueden adem&aacute;s formar micelas invertidas en solventes org&aacute;nicos con un contenido de agua moderado, lo que puede traducirse en una mayor actividad y estabilizaci&oacute;n de las mol&eacute;culas enzim&aacute;ticas ubicadas en su interior (Shome <i>et al</i>., 2007). Los detergentes tambi&eacute;n pueden influir sobre las propiedades estereoselectivas de las lipasas (Tsai <i>et al</i>., 1996).</p>       <p>Sin embargo, el efecto de los detergentes no es homog&eacute;neo para todas las enzimas, ni &eacute;stas son afectadas del mismo modo por todos los surfactantes (Aloulou <i>et al</i>., 2007). Adem&aacute;s, la influencia de estos compuestos sobre la actividad lipasa es dependiente de la dosis (Sonesson <i>et al</i>., 2006). Las sales biliares son activadores fundamentales para las lipasas pancre&aacute;ticas de mam&iacute;feros en presencia de colipasa (Kimura <i>et al</i>., 1982; Larsson y Erlanson-Albertsson, 1983), y resultan inhibitorias para otras lipasas (Barnescu <i>et al</i>., 1997). El SDS, conocido por su efecto desnaturalizante sobre las prote&iacute;nas, activa a determinadas lipasas e inhibe a otras (Wu <i>et al</i>., 1996). Algunos detergentes no i&oacute;nicos previenen la formaci&oacute;n de agregados enzim&aacute;ticos (Palomo <i>et al</i>., 2003) y estabilizan estructuralmente a la mol&eacute;cula (Guis&aacute;n <i>et al</i>., 1996b). El Triton-X100 es un detergente no i&oacute;nico conocido por su capacidad de estimular la actividad de las lipasas (Sharma <i>et al</i>., 2002).</p>       <p><b>M&eacute;todos de determinaci&oacute;n de la actividad enzim&aacute;tica</b></p>       <p>La actividad esterasa m&aacute;s general puede determinarse empleando como sustratos los &eacute;steres de cadena ac&iacute;lica del <i>p</i>-nitrofenol o del &alpha;/&Beta;-naftol, siguiendo la liberaci&oacute;n de la base alcoh&oacute;lica por m&eacute;todos espectrofotom&eacute;tricos. Deben considerarse los distintos coeficientes de extinci&oacute;n del p-nitrofenol a diferentes valores de pH, la ausencia de absorbancia a pH &aacute;cido, y la ocurrencia de hidr&oacute;lisis espont&aacute;nea a pH b&aacute;sico (De Caro <i>et al</i>., 1986; Gupta <i>et al</i>., 2003).</p>       <p>Se han desarrollado numerosos ensayos para cuantificar la actividad hidrol&iacute;tica de las lipasas en distintas muestras biol&oacute;gicas. &eacute;stos permiten monitorear tanto el consumo de los sustratos como la liberaci&oacute;n de los productos en el tiempo (Beisson <i>et al</i>., 2000). La desaparici&oacute;n de los sustratos puede seguirse por nefelometr&iacute;a o turbidimetr&iacute;a (von Tigerstrom y Stelmaschuk, 1989). Sin embargo, algunas variantes de estos m&eacute;todos experimentan interferencias debidas a la complejidad de ciertas mezclas. El consumo de los sustratos tambi&eacute;n puede ser monitoreado por m&eacute;todos espectrofotom&eacute;tricos (Goujard <i>et al</i>., 2009), tensiometr&iacute;a interfacial (Aloulou <i>et al</i>., 2007), microscop&iacute;a de fuerza at&oacute;mica (Prim <i>et al</i>., 2006) y espectroscop&iacute;a infrarroja. Los &uacute;ltimos tres m&eacute;todos requieren un equipamiento costoso.</p>       <p>El an&aacute;lisis de la velocidad de liberaci&oacute;n de los &aacute;cidos grasos puede efectuarse indirectamente mediante el seguimiento de los protones liberados durante la hidr&oacute;lisis enzim&aacute;tica. El m&eacute;todo de pH-stat, que se fundamenta en la valoraci&oacute;n de la disminuci&oacute;n del pH en el tiempo, es una de las t&eacute;cnicas m&aacute;s utilizadas bajo este principio (Bertolini <i>et al</i>., 1995). Los &aacute;cidos grasos liberados por la actividad de la lipasa se ionizan en soluci&oacute;n acuosa mediante la p&eacute;rdida de protones y la mezcla de reacci&oacute;n tiende a acidificarse. La velocidad de liberaci&oacute;n de los &aacute;cidos grasos es proporcional a la velocidad de liberaci&oacute;n de los protones y, por tanto, a la velocidad de acidificaci&oacute;n del medio. Si se a&ntilde;ade NaOH a la misma velocidad a la que se liberan los protones, el pH de la mezcla se mantiene constante en el tiempo. Este ensayo consiste en registrar la velocidad a la que es necesario a&ntilde;adir el NaOH titulante a la mezcla de reacci&oacute;n, a fin de mantener el pH en un valor fijo. Esta velocidad es proporcional a la velocidad de hidr&oacute;lisis enzim&aacute;tica de los enlaces &eacute;ster del sustrato y, por tanto, su medici&oacute;n permite determinar la actividad de la enzima. La t&eacute;cnica de pH-stat se ha empleado para cuantificar la actividad lipasa en plantas, suero, plasma y secreci&oacute;n duodenal. El ensayo presenta un l&iacute;mite de detecci&oacute;n en el orden de 0,1 µmol/min y solo puede desarrollarse en un intervalo restringido de valores de pH, los que deben igualar o exceder el valor aparente de pKa de los &aacute;cidos grasos liberados, ya que &eacute;stos deben encontrarse parcialmente ionizados (Beisson <i>et al</i>., 2000).</p>       ]]></body>
<body><![CDATA[<p>Otra forma de medir la liberaci&oacute;n de protones durante el avance de la reacci&oacute;n es mediante el empleo de indicadores coloreados, cuyos espectros de absorci&oacute;n cambian con la variaci&oacute;n del pH. Estos m&eacute;todos son poco espec&iacute;ficos y pueden detectar cualquier enzima que acidifique el medio (Lobo de Ara&uacute;jo y Radvanyi, 1987). Tambi&eacute;n es posible medir directamente la disminuci&oacute;n en el pH, pero esta variante es muy poco sensible y los cambios de pH pueden quedar enmascarados por la acci&oacute;n del tamp&oacute;n (Tan y Tan, 1988).</p>       <p>La cuantificaci&oacute;n de los &aacute;cidos grasos liberados durante el transcurso de la reacci&oacute;n se ha abordado utilizando m&eacute;todos colorim&eacute;tricos que apelan a reactivos cromog&eacute;nicos cuyas absorbancias var&iacute;an al interactuar con estas mol&eacute;culas. Para garantizar una se&ntilde;al de fondo lo m&aacute;s baja posible, los triacilglic&eacute;ridos empleados como sustratos no deben contener cantidades elevadas de &aacute;cidos grasos libres acompa&ntilde;antes. Tambi&eacute;n se han desarrollado ensayos fluorim&eacute;tricos (Knotz <i>et al</i>., 2006), basados en la interacci&oacute;n entre los &aacute;cidos grasos liberados y determinados fluor&oacute;foros. Estos m&eacute;todos son muy sensibles y costosos. La cromatograf&iacute;a en placa fina permite cuantificar los &aacute;cidos grasos liberados mediante t&eacute;cnicas densitom&eacute;tricas o autorradiogr&aacute;ficas. Este m&eacute;todo es discontinuo y consume mucho tiempo. La separaci&oacute;n entre el sustrato y los productos radiactivos tambi&eacute;n puede realizarse mediante HPLC, centrifugaci&oacute;n o extracci&oacute;n con solventes. El ensayo radioisot&oacute;pico es muy espec&iacute;fico y sensible, y su l&iacute;mite de detecci&oacute;n es del orden de los picomoles. Su inconveniente principal radica en el empleo de triacilglic&eacute;ridos sint&eacute;ticos marcados radiactivamente (Beisson et al., 2000).</p>       <p>Esta variedad de ensayos enzim&aacute;ticos proporciona amplias posibilidades al investigador en este campo, pero al mismo tiempo dificulta la comparaci&oacute;n entre los resultados obtenidos en distintos laboratorios mediante el empleo de m&eacute;todos diferentes. Esto se debe a que las condiciones del ensayo influyen sobre la velocidad de la reacci&oacute;n catalizada enzim&aacute;ticamente (Ch&aacute;vez <i>et al</i>., 1990).</p>       <p><b>Inmovilizaci&oacute;n</b></p>       <p>Las ventajas derivadas de la inmovilizaci&oacute;n de enzimas tambi&eacute;n son aplicables a las lipasas. Debido a la hidrofobicidad marcada que presentan los sustratos naturales de estas enzimas, las mezclas de reacci&oacute;n en las que ellas operan deben contener un solvente org&aacute;nico o un agente emulsificante apropiados, que traen consigo la ruptura de la homogeneidad del medio. Bajo estas condiciones, es deseable que la lipasa constituya una fase independiente dentro del sistema de reacci&oacute;n, a fin de prevenir la contaminaci&oacute;n de los productos con cierto nivel de actividad enzim&aacute;tica residual. Esta aspiraci&oacute;n tecnol&oacute;gica puede alcanzarse con la inmovilizaci&oacute;n, la que adem&aacute;s extiende el tiempo de vida &uacute;til del reactor (Balcão <i>et al</i>., 1996; Kneževic <i>et al</i>., 2004). Se ha desarrollado una variedad amplia de protocolos de inmovilizaci&oacute;n para las lipasas (<a href="#t4">tabla 4</a>).</p>        <p align="center"><a name="t4"><img src="img/revistas/biote/v12n1/v12n1a13t4.JPG">      <p><b>Inmovilizaci&oacute;n por adsorci&oacute;n interfacial</b></p>       <p>Uno de los protocolos de inmovilizaci&oacute;n m&aacute;s difundidos para las lipasas es la adsorci&oacute;n selectiva sobre soportes con cierto grado de hidrofobicidad (Fern&aacute;ndez-Lafuente <i>et al</i>., 1998). Seg&uacute;n la propuesta de Bastida <i>et al</i>. (1998), los soportes hidrof&oacute;bicos mimetizan las interfaces formadas por los sustratos naturales de las lipasas, por lo que estas enzimas se adsorben fuertemente sobre ellos en una forma abierta e hiperactivada, involucrando la zona de contacto lip&iacute;dico (Okkels et al., 1996). Esta interacci&oacute;n no es un efecto de asociaciones hidrof&oacute;bicas, ya que se produce a fuerzas i&oacute;nicas bajas (Bastida <i>et al</i>., 1998; Fern&aacute;ndez-Lafuente <i>et al</i>., 1998; Sabuquillo <i>et al</i>., 1998; Snellman <i>et al</i>., 2002) y las lipasas son prote&iacute;nas muy hidrof&iacute;licas (Fern&aacute;ndez- Lafuente <i>et al</i>., 1998). Por tanto, este es un mecanismo de adsorci&oacute;n interfacial, basado en la activaci&oacute;n interfacial y propio solo de prote&iacute;nas con actividad superficial como las lipasas.</p>       <p>Entre las bondades que presenta el m&eacute;todo de inmovilizaci&oacute;n por adsorci&oacute;n interfacial pueden citarse la sencillez de la t&eacute;cnica, la ausencia de reactivos caros y t&oacute;xicos, la capacidad para retener o incrementar la actividad espec&iacute;fica (Malcata et al., 1992; Palomo <i>et al</i>., 2004; Cunha <i>et al</i>., 2009), la potenciaci&oacute;n de la estereoselectividad de la lipasa (Bastida <i>et al</i>., 1998; Fern&aacute;ndez-Lafuente et al., 1998), y la posibilidad de recuperar el soporte, debido a la reversibilidad parcial de las interacciones (Balcão <i>et al</i>., 1996).</p>       <p>Entre los soportes m&aacute;s utilizados para estos fines se encuentran aquellos basados en la activaci&oacute;n de la agarosa con grupos hidrof&oacute;bicos como butilo, fenilo y octilo (Bastida <i>et al</i>., 1998; Sabuquillo <i>et al</i>., 1998; Fern&aacute;ndez- Lafuente <i>et al</i>., 1998; Cunha <i>et al</i>., 2009). La fortaleza de la adsorci&oacute;n de las lipasas sobre octyl-agarosa es de tal magnitud, que se requieren altas concentraciones de detergente, urea o guanidina para romper las interacciones (Fern&aacute;ndez- Lafuente <i>et al</i>., 1998).</p>       ]]></body>
<body><![CDATA[<p><b>Aplicaciones biotecnol&oacute;gicas</b></p>       <p>Las enzimas son catalizadores biol&oacute;gicos extraordinariamente espec&iacute;ficos y de gran poder catal&iacute;tico. La aplicaci&oacute;n industrial de la tecnolog&iacute;a enzim&aacute;tica es particularmente interesante en procesos que requieren condiciones de reacci&oacute;n suaves, en t&eacute;rminos de pH, temperatura y presi&oacute;n, debido a la labilidad de la mezcla. Estas mol&eacute;culas se requieren en cantidades peque&ntilde;as, pueden distinguir entre grupos funcionales de reactividad similar y son capaces de modificar un sustrato dado dentro de una mezcla compleja, llegando a discriminar incluso entre dos is&oacute;meros &oacute;pticos en el caso de compuestos quirales. En la literatura especializada puede encontrarse abundante documentaci&oacute;n sobre el empleo de enzimas en la obtenci&oacute;n de principios activos (Klibanov, 1990).</p>       <p>Las lipasas son enzimas con una aplicaci&oacute;n amplia en diferentes procesos industriales, particularmente en sus formas inmovilizadas. Ellas se emplean en la producci&oacute;n de detergentes y de saborizantes naturales (Pandey <i>et al</i>., 1999), en la hidr&oacute;lisis de aceites y grasas (Taylor, 1996), en la producci&oacute;n de papel (Jaeger y Reetz, 1998) y en la elaboraci&oacute;n de cosm&eacute;ticos (Benjamin y Pandey, 1998). Debido a su capacidad de catalizar la s&iacute;ntesis de determinados compuestos en medios org&aacute;nicos con actividad de agua controlada (Dandavate <i>et al</i>., 2009; Gupta y Khare, 2009), las lipasas se han empleado en la producci&oacute;n de intermediarios para la s&iacute;ntesis org&aacute;nica (Vaidya, 1996), as&iacute; como de penicilinas (Savidge, 1984).</p>       <p>Las lipasas han sido utilizadas extensivamente en la obtenci&oacute;n de compuestos &oacute;pticamente puros (Yoshimura <i>et al</i>., 2002) y en la resoluci&oacute;n de mezclas rac&eacute;micas (Kirchner et al., 1985; Felluga <i>et al</i>., 2009), aprovechando sus propiedades estereoespec&iacute;ficas (Bornscheuer, 2002; Segura <i>et al</i>., 2004). Esta aplicaci&oacute;n tiene un impacto considerable en la producci&oacute;n de f&aacute;rmacos m&aacute;s selectivos y efectivos, con efectos secundarios menores, y en la obtenci&oacute;n de pesticidas con menor incidencia en el medio ambiente (Zarev&uacute;cka y Wimmer, 2008). Esto se debe a que la actividad funcional de los compuestos quirales es debida generalmente a uno de los enanti&oacute;meros, mientras que el otro es inocuo o perjudicial, y puede reducir la actividad del primero, provocar reacciones colaterales indeseadas, o simplemente aportar una contribuci&oacute;n innecesaria a la dosis terap&eacute;utica con su presencia en la mezcla (Ariens, 1984).</p>       <p><b>Conclusiones</b></p>       <p>Las lipasas son enzimas extraordinariamente vers&aacute;tiles que han recibido considerable atenci&oacute;n en biotecnolog&iacute;a desde hace m&aacute;s de tres d&eacute;cadas. Esto se debe a las peculiares propiedades funcionales que exhiben estas mol&eacute;culas, dado su car&aacute;cter de enzimas interfaciales. La activaci&oacute;n en interfaces, una especificidad de sustrato amplia y una selectividad basada en m&uacute;ltiples determinantes estructurales, una sensibilidad de la actividad enzim&aacute;tica muy rica frente a numerosos y variados efectores, la posibilidad de inmovilizaci&oacute;n con altas retenciones de la actividad funcional, la estabilidad operacional de los biocatalizadores inmovilizados, la estabilidad en solventes org&aacute;nicos, y la capacidad de desarrollar la cat&aacute;lisis en medios con baja actividad de agua, son algunos de los aspectos m&aacute;s atractivos de las lipasas que han determinado su papel protag&oacute;nico en numerosos procedimientos de la tecnolog&iacute;a enzim&aacute;tica. Profundizar en las bondades y limitaciones de estas enzimas como biocatalizadores, contribuye a la optimizaci&oacute;n de los procesos biotecnol&oacute;gicos en los que ellas participan y, por tanto, a una mejor aplicaci&oacute;n de las lipasas para la obtenci&oacute;n de bioproductos de utilidad humana.</p>       <p><b>Referencias bibliogr&aacute;ficas</b></p>       <!-- ref --><p>1 Alam, M., Vance, D. E., Lehner, R. 2002. Structure-function analysis of human triacylglycerol hydrolase by site-directed mutagenesis: identification of the catalytic triad and a glycosylation site. Biochem 41 (21): 6679-87.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000080&pid=S0123-3475201000010001300001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>2 Aloulou, A., Puccinelli, D., De Caro, A. 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