Abstract

SERRANO RIANO, Julieth; SASTOQUE RIVERA, Luz Ángela; MONTOYA CASTANO, Dolly  and  MORENO SARMIENTO4, Nubia. Analysis of polyhydroxyalkanoate synthases (PhaC1 and PhaC2) in a strain of Pseudomonas fluorescens IBUN S1602 isolated from Colombian soil. Rev. colomb. biotecnol [online]. 2011, vol.13, n.2, pp.84-96. ISSN 0123-3475.

The strain Pseudomonas fluorescens IBUN S1602 forms the group of isolates from colombian sugarcane soil´s, which accumulates polyhydroxyalkanoate biopolymer (PHA) and was selected as promising for commercial scale by having affinity for economic and alternative substrates such as glycerol, oils, whey, among others. Given the importance of the synthase enzyme in the synthesis of PHAs, was realized the molecular analysis of genes phaC1 and phaC2 which encode type II synthases (PhaC1 y PhaC2). To obtain the amplimers required in the sequencing, was used the PCR technique under standardized conditions for primers designed based on the updated review in databases. Were identified two fragments of 1680 bp and 1683 bp for phaC1 and phaC2. Comparative analysis of the resulting protein sequences of these genes shows that the IBUN S1602 synthases containing the region α/β hydrolase and 8 conserved amino acid residues that are characteristic of synthases examined worldwide. Enzyme structure was analyzed at the primary level and was predicted the secondary. It is concluded that synthase strain Pseudomonas fluorescens IBUN S1602 has high homology with type II synthases that are reported for Pseudomonas. The results contribute to basic understanding of the biosynthesis of PHA, and will allow in the future, increasing the quality of PHA due to modulation of the level of synthase is expressed in a recombinant organism, in order to vary the weight molecular biopolymer, an essential property in the study of industrial applications.

Keywords : polyhydroxyalkanaotes; PHA synthase; bioinformatics; biopolymer; PhaC1; PhaC2..

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