Biosynthesis of poly(3-hydroxybutyrate-co-3-hydroxyalkanoates) by recombinant Escherichia coli from glucose

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<jats:title>Abstract</jats:title> <jats:p>Pseudomonas sp. 61-3 accumulates two types of polyhydroxyalkanoates (PHAs), poly(3-hydroxybutyrate) [P(3HB)], and poly(3HB-co-3-hydroxyalkanoates) [P(3HB-co-3HA)], and some proteins associated with their PHA granules have been identified. To date, PhaFPs (GA36) and PhaIPs (GA18) were identified from P(3HB-co-3HA) granules. In this study, the gene encoding GA24 associated with P(3HB) granule was identified as phbPPs. PhbPPs was composed of 192 amino acids with a calculated molecular mass of 20.4 kDa and was assumed to be a phasin. phbFPs gene and unknown ORF were also found on phb locus. PhbFPs was anticipated to be the transcriptional repressor of phbPPs gene. PhbPPs was bound to the P(3HB-co-3HA) granules with 3HB composition of more than 87 mol%, and PhaIPs and PhaFPs were bound to the P(3HB-co-3HA) granules with 3HA (C6–C12) composition of more than 13 mol% in the producing cells, suggesting that localization of these proteins is attributed to the monomer compositions of the copolymers.</jats:p>

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