<?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>0120-548X</journal-id>
<journal-title><![CDATA[Acta Biológica Colombiana]]></journal-title>
<abbrev-journal-title><![CDATA[Acta biol.Colomb.]]></abbrev-journal-title>
<issn>0120-548X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia, Facultad de Ciencias, Departamento de Biología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-548X2010000100020</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[DINÁMICA DEL COMPLEJO DEL PORO NUCLEAR]]></article-title>
<article-title xml:lang="en"><![CDATA[DINAMICS OF NUCLEAR PORE COMPLEX]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[GEYDAN]]></surname>
<given-names><![CDATA[TD]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[GARZÓN-CORAL]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[FAJARDO]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[SPINEL]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional de Colombia Centro Internacional de Física Laboratorio de Biofísica]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>30</day>
<month>04</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>30</day>
<month>04</month>
<year>2010</year>
</pub-date>
<volume>15</volume>
<numero>1</numero>
<fpage>281</fpage>
<lpage>288</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-548X2010000100020&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-548X2010000100020&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-548X2010000100020&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El complejo del poro nuclear (CPN) es un conjunto supra-molecular compuesto de múltiples copias de 30 familias de proteínas diferentes, siendo 456 nucleoporinas (Nups) en total que atraviesan la envoltura nuclear de todos los organismos pertenecientes al dominio Eukaria. El CPN es la compuerta del núcleo por lo tanto, todas las macromoléculas deben atravesarla para transitar del núcleo al citoplasma y viceversa. Durante los últimos años, se han propuesto varios modelos para explicar la regulación y el transporte de macromoléculas a través del CPN. En este escrito se describe la estructura, los mecanismos y procesos involucrados durante el transporte a través del CPN, y cómo estos procesos son regulados por interacciones macromoleculares altamente dinámicas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The nuclear pore complex (NPC) is a large supramolecular assemble made up of multiple copies of about 30 different families proteins, so in total 456 nucleoporines (Nups) span the nuclear envelope of all Eukariotic organisms. The NPC is considered the gate through which all macromolecules must pass in order to achieve nucleo-cytoplasmic transport. The aim of this review is to describe the structure, mechanisms and processes involved during the transportation of molecules and how of these processes are regulated by highly dynamic macromolecular interactions with molecules of the NPC which have been described during the past years.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Complejo del poro nuclear (CPN)]]></kwd>
<kwd lng="es"><![CDATA[transporte macromolecular]]></kwd>
<kwd lng="es"><![CDATA[nucleoproteínas]]></kwd>
<kwd lng="es"><![CDATA[(Nups)]]></kwd>
<kwd lng="en"><![CDATA[Nuclear pore complex (CPN)]]></kwd>
<kwd lng="en"><![CDATA[macromolecular transport]]></kwd>
<kwd lng="en"><![CDATA[nucleoproteins (Nups)]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">      <p align="center"><font size="4"> <b>DIN&Aacute;MICA DEL COMPLEJO DEL PORO NUCLEAR </b></font></P >      <P align="center"   >DINAMICS OF NUCLEAR PORE COMPLEX</P >     <P   >GEYDAN TD<sup>1</sup> MSc Est-PhD, GARZ&Oacute;N-CORAL C<sup>1</sup>, FAJARDO C<sup>1</sup> MSc, SPINEL C<sup>1</sup> PhD. <sup>1</sup>Laboratorio de Biof&iacute;sica, Centro Internacional de F&iacute;sica, Universidad Nacional de Colombia. Cr 30 No. 45 03, Bogot&aacute;, Colombia.<a href="mailto:cmspinelgäunal.edu.co">cmspinelgäunal.edu.co </a> </P >     <P   >Presentado 29 de septiembre de 2008, aceptado 2 de septiembre de 2009, correciones 30 de septiembre de 2009 </P ><hr size="1">     <P   >RESUMEN </P >     <P   > El complejo del poro nuclear (CPN) es un conjunto supra-molecular compuesto de m&uacute;ltiples copias de 30 familias de prote&iacute;nas diferentes, siendo 456 nucleoporinas (Nups) en total que atraviesan la envoltura nuclear de todos los organismos pertenecientes al dominio <I>Eukaria</I>. El CPN es la compuerta del n&uacute;cleo por lo tanto, todas las macromol&eacute;culas deben atravesarla para transitar del n&uacute;cleo al citoplasma y viceversa. Durante los &uacute;ltimos a&ntilde;os, se han propuesto varios modelos para explicar la regulaci&oacute;n y el transporte de macromol&eacute;culas a trav&eacute;s del CPN. En este escrito se describe la estructura, los mecanismos y procesos involucrados durante el transporte a trav&eacute;s del CPN, y c&oacute;mo estos procesos son regulados por interacciones macromoleculares altamente din&aacute;micas. </P >     <P   >Palabras clave: Complejo del poro nuclear (CPN), transporte macromolecular, nucleoprote&iacute;nas (Nups) </P ><hr size="1">     <P   >ABSTRACT </P >     <P   > The nuclear pore complex (NPC) is a large supramolecular assemble made up of multiple copies of about 30 different families proteins, so in total 456 nucleoporines (Nups) span the nuclear envelope of all <I>Eukariotic</I> organisms. The NPC is considered the gate through which all macromolecules must pass in order to achieve nucleo-cytoplasmic transport. The aim of this review is to describe the structure, mechanisms and processes involved during the transportation of molecules and how of these processes are regulated by highly dynamic macromolecular interactions with molecules of the NPC which have been described during the past years. </P >     ]]></body>
<body><![CDATA[<P   >Key words: Nuclear pore complex (CPN), macromolecular transport, nucleoproteins (Nups) </P ><hr size="1">     <P   >INTRODUCCI&Oacute;N </P >     <P   > En las &uacute;ltimas dos d&eacute;cadas, el estudio del CPN ha permitido entender la estructura y la funci&oacute;n de esta macromol&eacute;cula de las c&eacute;lulas eucari&oacute;ticas. Con estos conocimiento se ha podido: prevenir la invasi&oacute;n viral en plantas y animales (Krischevsky <I>et &aacute;l.</I>, 2006), determinar la expresi&oacute;n anormal de las prote&iacute;nas (Nups) que lo conforman cuando tienen relaci&oacute;n directa con enfermedades como la hepatitis B y C (Knoess <I>et &aacute;l.</I>, 2006). Utilizar la expresi&oacute;n de algunas prote&iacute;nas del CPN como tratamientos antitumorales (Rabut et &aacute;l., 2004; Liu et &aacute;l, 2005; Cronshaw y Matunis, 2004). Entender el transporte a trav&eacute;s del CPN y c&oacute;mo las Nups lo conforman e interact&uacute;an, permitir&aacute; encontrar mejores tratamientos para las enfermedades relacionadas con esta estructura celular. </P >     <P   >ESTRUCTURA </P >     <P   >En vertebrados hay 2.000 a 4.000 CPN por n&uacute;cleo y en levaduras dif&iacute;cilmente supera los 200 (Adam, 2001). La envoltura nuclear (EN) delimita el n&uacute;cleo y est&aacute; constituida por las membranas: externa (<a href="img/revistas/abc/v15n1/v15n1a20f1.jpg" target="_blank">Figura 1B</a> M-Ext) e interna (Fig. 1M-Int) que se unen por el dominio de membrana donde se aloja el CPN (<a href="img/revistas/abc/v15n1/v15n1a20f1.jpg" target="_blank">Figura 1B</a> M-CPN). El CPN posee una estructura de “rueda o rueca” proteica de ~50 a ~60 megakilodaltons (Bednenko <I>et &aacute;l.</I>, 2003; Lim y Fahrenkrog, 2006) que corresponde al armaz&oacute;n central del CPN compuesto en su periferia por 16 columnas de 4 Nups (<a href="img/revistas/abc/v15n1/v15n1a20f1.jpg" target="_blank">Fig 1</a> indicadas por las flechas que muestran los anillos). Estas columnas forman 2 anillos centrales situados en el ecuador del CPN, un anillo citoplasm&aacute;tico y un anillo nuclear, estos anillos se encuentran interrelacionados por Nups de uni&oacute;n o microesp&iacute;culas (<a href="img/revistas/abc/v15n1/v15n1a20f1.jpg" target="_blank">Figura 1B</a>). Del anillo citoplasm&aacute;tico se proyectan ocho filamentos de car&aacute;cter proteico hacia el citoplasma (<a href="img/revistas/abc/v15n1/v15n1a20f1.jpg" target="_blank">Figura 1B</a>); y del anillo nuclear se proyectan ocho filamentos que se unen a un anillo distal proteico, formando la canastilla nuclear hacia el nucleoplasma (<a href="img/revistas/abc/v15n1/v15n1a20f1.jpg" target="_blank">Figura 1B</a>) (Ryan y Wente, 2000, Alberts <I>et &aacute;l.</I>, 2002; Spinel, 2002; Schwartz, 2005; Lim y Fahrenkrog, 2006; Alber <I>et &aacute;l</I>., 2007). </P >     <P   >El CPN es fijado en los poros de la EN por glicoNups y Nups transmembranosas (<a href="img/revistas/abc/v15n1/v15n1a20f1.jpg" target="_blank">Figura 1A y B</a> gluNups) que interact&uacute;a con los anillos internos del CPN (Newmeyer<I> et &aacute;l.</I>, 1993; Pant&eacute; y Aebi, 1993; Nehrbass <I>et &aacute;l.</I>, 1996; Antonin <I>et &aacute;l</I>., 2005) y con el anillo de membrana ubicado en el espacio perinuclear de la EN (Somerharju <I>et &aacute;l</I>., 1999; Alber <I>et &aacute;l.</I>, 2007). Este posicionamiento geogr&aacute;fico se incrementa por el contacto de las l&aacute;minas del n&uacute;cleo-esqueleto con el anillo nuclear (Fahrenkrog <I>et &aacute;l</I>., 2004). En el interior de la rueca se ubican las regiones ricas en fenilalanina-glicina (FG) formando un hidrogel hidrof&oacute;bico (Fig. 1B FG) en el canal del CPN (Alber <I>et &aacute;l</I>., 2007; Terry <I>et &aacute;l</I>., 2007), y reforzado por repeticiones de glicina-leucina-fenilalanina-glicina (cuerpos GLFG) de otras Nups (Lim y Fahrenkrog, 2006). Hay Nups o secuencias de Nups fundamentales para mantener la estructura del CPN, por ejemplo, si se elimina una de las 9 Nups 107 a 160, se desorganiza el CPN (Vasu y Forbes, 2001; Fahrenkrog <I>et &aacute;l</I>., 2002; Bednenko <I>et &aacute;l</I>., 2003; Harel <I>et &aacute;l</I>., 2003; Walther <I>et &aacute;l</I>., 2003; Schwartz, 2005); mientras que otras secuencias no son indispensable, como las regiones FG que pueden suprimirse 50% y no se desorganiza el CPN (Strawn <I>et &aacute;l</I>., 2004). Es a trav&eacute;s de las condiciones hidrof&oacute;bicas centrales del CPN que se realiza el transporte de mol&eacute;culas bajo un control extraordinario. </P >     <P   >TRANSPORTE A TRAV&Eacute;S DEL CPN </P >     <P   > El transporte n&uacute;cleo-citoplasma es realizado por complejos transportadores que interact&uacute;an transitoriamente con las regiones FG de las Nups. Las prote&iacute;nas transportadoras con su cargo pueden reemplazar las uniones l&aacute;biles entre dominios FG por uniones con ellos mismos, o los dominios FG no interact&uacute;an entre s&iacute; acarreando los transportadores (Rout <I>et &aacute;l.</I>, 2000; Sekimoto <I>et &aacute;l.</I>, 1997, Nakielny y Dreyfuss, 1999; Ribbeck y G&ouml;rlich, 2001; Poon y Jans, 2005; Frey <I>et &aacute;l.</I>, 2006; Terry <I>et &aacute;l.</I>, 2007). </P >     <P   >La importaci&oacute;n y la exportaci&oacute;n de mol&eacute;culas o cargos a trav&eacute;s del CPN es realizada por carioferinas &beta; (kap) conocidas como importinas &alpha;&#61472; y &beta;, o exportinas cuando median le transporte hacia el necleoplasma o citoplasma respectivamente ( Pemberton y Paschal, 2005 ). Ellas reconocen se&ntilde;ales en la mol&eacute;cula de importaci&oacute;n la NLS (secuencia de localizaci&oacute;n nuclear; <a href="img/revistas/abc/v15n1/v15n1a20f2.jpg" target="_blank">Fig 2</a> (S)) y en el de la exportaci&oacute;n la NES (secuencias de exportaci&oacute;n nuclear; <a href="img/revistas/abc/v15n1/v15n1a20f2.jpg" target="_blank">Fig 2</a> (N)) que a diferencia de las NLS son poco conservadas (Pemberton y Paschal, 2005; Terry <I>et &aacute;l.</I>, 2007). Excepcionalmente hay transporte sin intervenci&oacute;n de las carioferinas como las histonas o subunidades ribosomales (Sekimoto <I>et &aacute;l.</I>, 1997, Nakielny y Dreyfuss, 1999; Poon y Jans, 2005). Cambios intra o intermoleculares transitorios, como la fosforilaci&oacute;n o la formaci&oacute;n de enlaces disulf&uacute;ricos pueden o no ocultar las se&ntilde;ales NES o NLS (Beinke y Ley, 2004; Poon y Jans, 2005) </P >     <P   >El proceso de importaci&oacute;n es general, la importina-&alpha; se une a la se&ntilde;al NLS <a href="img/revistas/abc/v15n1/v15n1a20f2.jpg" target="_blank">Fig 2</a> (S)) de la mol&eacute;cula a importar y a la importina-&beta; (Fig. 2B) ( Yoneda, 2000 ; Goldfarb <I>et &aacute;l</I>., 2004). En el n&uacute;cleo la importina-&beta; se una a la RanGTP (Fig. 2 (GTP)) y regresa al citoplasma a trav&eacute;s del CPN (Fig. 2C) (Goldfarb <I>et &aacute;l.</I>, 2004; Mosammaparast y Pemberton, 2004). Mientras que la importina-&alpha; se une a una prote&iacute;na denominada complejo CAS (<a href="img/revistas/abc/v15n1/v15n1a20f2.jpg" target="_blank">Fig 2D</a> (CA)) y a otra RanGTP, as&iacute; este complejo es exportado al citoplasma. Una RanGTPasa (RanGAP) anclada al anillo citopl&aacute;smico del CNP convierte las RanGTP en RanGDP disociando los complejos antes de alcanzar el citoplasma, manteniendo un gradiente RanGDP en citoplasma y RanGTP en el n&uacute;cleo (Fig. 2 (gradiente RanGTP)). A su vez, la RanGDP se une al factor de transporte NTF2 (Fig. 2E (GDP-NT)) y es importado al nucleoplasma donde r&aacute;pidamente las RanGDP son convertidas en RanGTP por una RanSintetasa (RCC1) que fosforila la RanGDP, o por una intercambiadora (RanGEF) de GDP por GTP de las Ran; las RanGEF y RCC1se ubican en la cromatina (<a href="img/revistas/abc/v15n1/v15n1a20f2.jpg" target="_blank">Fig 2</a> (F)). As&iacute;, se disocia el NTF2 de la RanGTP, &eacute;stas &uacute;ltimas vuelven a participar en otro ciclo de importaci&oacute;n-exportaci&oacute;n (Pemberton y Paschal, 2005 ; Mosammaparast y Pemberton, 2004): </P >     ]]></body>
<body><![CDATA[<P   >La exportaci&oacute;n de mol&eacute;culas tiene pasos similares a los descritos para la importaci&oacute;n. Una exportina (CRM1 o XPO1) (<a href="img/revistas/abc/v15n1/v15n1a20f2.jpg" target="_blank">Fig 2</a> Ex)) se une a la RanGTP y se una a la se&ntilde;al NES (<a href="img/revistas/abc/v15n1/v15n1a20f2.jpg" target="_blank">Fig 2</a> (N)) de la mol&eacute;cula a exportar, luego se acoplan con el factor de exportaci&oacute;n NXT1 (<a href="img/revistas/abc/v15n1/v15n1a20f2.jpg" target="_blank">Fig 2</a> (Nx)) y a la fosfoprote&iacute;na b&aacute;sica reguladora de la Ran (RanBRP); este complejo se acopla en la canastilla del CPN y es exportado al citoplasma (<a href="img/revistas/abc/v15n1/v15n1a20f2.jpg" target="_blank">Fig 2A</a>). En el citoplasma, prote&iacute;nas citos&oacute;licas reguladoras de uni&oacute;n a Ran (RanBP1 y RanBP2) junto con la RanGAP (<a href="img/revistas/abc/v15n1/v15n1a20f2.jpg" target="_blank">Fig 2</a> (RanBRP)), hidrolizan la RanGTP en RanGDP, y el complejo es disociado liberando la mol&eacute;cula exportada en el citoplasma (<a href="img/revistas/abc/v15n1/v15n1a20f2.jpg" target="_blank">Fig 2A</a> (N)). La exportina y el factor de exportaci&oacute;n son reciclados hacia el necleoplasma por las interacciones directas con las Nups (Matsuura y Stewart, 2004; Ossareh-Nazari <I>et &aacute;l</I>., 2001; Goldfarb <I>et &aacute;l</I>., 2004). </P >     <P   >El gradiente de las prote&iacute;nas Ran a trav&eacute;s del CPN (<a href="img/revistas/abc/v15n1/v15n1a20f2.jpg" target="_blank">Fig 2</a> (gradiente RanGTP)) es esencial y asegura la direcci&oacute;n correcta del transporte ( Yoneda, 2000 ; Terry <I>et &aacute;l</I>., 2007; Trinkle-Mulcahy y Lamond, 2007). La conformaci&oacute;n del CPN y su interacci&oacute;n con la mol&eacute;cula a transportar modulan la exportaci&oacute;n de receptores de glucocorticoides y del inhibidor de la prote&iacute;na quinasa dependiente del AMPc independiente de RanGTP (Erickson <I>et &aacute;l.</I>, 2006; Paulillo <I>et &aacute;l.</I>, 2006). </P >     <P   >En la exportaci&oacute;n del &aacute;cido ribonucl&eacute;ico (ARNm, ARNt), o de ribonucleoprote&iacute;nas (part&iacute;culas U o <I>splisosomes</I>, subunidades ribosomales) participan adem&aacute;s prote&iacute;nas adaptadoras. Para la exportaci&oacute;n de la part&iacute;cula U se forma el complejo: exportina (CRM1/XPO1)/prote&iacute;na adaptadora/CBC (<I>cap-binding complex</I>) que reconocen al ARNsn de la part&iacute;cula U. La exportaci&oacute;n se activa por fosforilaci&oacute;n de la prote&iacute;na adaptadora y una Nup reconoce la se&ntilde;al NES del ARNsn independiente de RanGTP (Darzacq <I>et &aacute;l</I>., 2005). Para el ARNt, la exportina t (una XPO) reconoce el brazo aminoacil para facilitar la exportaci&oacute;n dependiente de RanGTP. La exportaci&oacute;n de las sub-unidades ribosomales depende de RanGTP y es independiente de exportinas, pero su mecanismo no se conoce. El ARNm puede ser exportado dependiente o independientemente de RanGTP. Cuando es dependiente hay dos exportinas (Transportina 2 o complejo CRM1/XPO1) que en ambos casos reconocen secuencias ricas en AU del ARNm, pero cuando interviene el complejo CRM1/XPO1 necesita dos prote&iacute;nas adaptadoras (pp32 y April) para el reconocimiento (Nakielny y Dreyfuss, 1999). Si la exportaci&oacute;n del ARNm es independiente de RanGTP el receptor (TAP en levadura y Mex67p en eucariotes superiores) se asocia con la prote&iacute;na adaptadora (p15) a la cola poli-A del ARNm (Taura <I>et &aacute;l</I>., 2005; Dinamaano y Ullman, 2004). En todos los casos, la prote&iacute;na adaptadora provee la secuencia NES para permitir la exportaci&oacute;n del ARNm. </P >     <P   >AGRADECIMIENTOS </P >     <P   > Ante todo, agradecemos a todos los estudiantes que asisten pacientemente a los cursos de biolog&iacute;a celular del Departamento de Biolog&iacute;a y a esta dependencia de la Universidad Nacional de Colombia. Al laboratorio de Biof&iacute;sica del Centro Internacional de F&iacute;sica. A quienes financian nuestros proyectos: Direcci&oacute;n de investigaci&oacute;n de la sede Bogot&aacute; de la Universidad Nacional de Colombia, Banco de la Rep&uacute;blica y Colciencias y programa Ecos Nord. Por &uacute;ltimo, un especial agradecimiento a la Unidad de transportadores en imagenier&iacute;a y radioterapia oncol&oacute;gica de la Universidad de Niza Spohia-Ant&iacute;polis y a la Bi&oacute;loga Carolina Ochoa. </P >     <P   >BIBLIOGRAF&Iacute;A </P >     <!-- ref --><P   > ADAM S.The nuclear pore complex. 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<person-group person-group-type="author">
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<article-title xml:lang="en"><![CDATA[The nuclear pore complex]]></article-title>
<source><![CDATA[Genome Biol]]></source>
<year>2001</year>
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