1887

Abstract

Eleven different cyanobacteria were investigated with respect to their capabilities to synthesize poly-3-hydroxybutyrate [poly(3HB)] and the type of poly-β-hydroxyalkanoic acid (PHA) synthase accounting for the synthesis of this polyester. Several methods, including (i) Southern blot analysis using a -specific DNA probe, (ii) Western blot analysis using specific polyclonal anti-PhaE antibodies raised in this study against PhaE of sp. strain PCC 6803, (iii) generation and sequence analysis of PCR products using -specific oligonucleotides as primers, and/or (iv) cloning and sequence analysis of PHA synthase structural genes, were used to provide evidence for the presence of a type-III PHA synthase in the following cyanobacteria: sp. strains MA19 and PCC 6715, PCC 6912, SAG 1403-2, sp. strains PCC 7424, PCC 8303 and PCC 8801, and sp. strain PCC 7428. The screening was compared with corresponding studies using crude protein extracts and genomic DNA of sp. strain PCC 6803, as a positive control, which is so far the only cyanobacterium for which molecular data of the PHA synthase genes are available. No evidence for the presence of a type-III PHA synthase could be obtained for only three of the eleven investigated cyanobacteria ( sp. strain PCC 7437, sp. strain PCC 8955 and sp. strain PCC 6501). The entire PHA synthase structural genes of the two thermophilic cyanobacteria sp. strain MA19 and PCC 6912, and in addition a central region of the gene of sp. strain PCC 8303, were cloned, sequenced and also heterologously expressed in .

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2001-11-01
2019-10-23
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