Production and characterization of medium-chain-length polyhydroxyalkanoate with high 3-hydroxytetradecanoate monomer content by fadB and fadA knockout mutant of Pseudomonas putida KT2442.

Abstract:

:Medium-chain-length polyhydroxyalkanoates (mcl-PHA) consisting of 3-hydroxyhexanoate (HHx), 3-hydroxyoctanoate (HO), 3-hydroxydecanoate, 3-hydroxydodecanoate, and high-content 3-hydroxytetradecanoate (HTD) was produced by knockout mutant Pseudomonas putida KT2442 termed P. putida KTOY06. When grown on 6 to14 g/L single-carbon-source tetradecanoic acid, P. putida KTOY06, which beta-oxidation pathway was weakened by deleting genes of 3-ketoacyl-coenzyme A (CoA) thiolase (fadA) and 3-hydroxyacyl-CoA dehydrogenase (fadB), for the first time, produced several mcl-PHA including 31 to 49 mol% HTD as a major monomer. HHx contents in these mcl-PHAs remained approximately constant at less than 3 mol%. In addition, large amounts of oligo-HTD were detected in cells, indicating the limited ability of P. putida KTOY06 in polymerizing long-chain-length 3-hydroxyalkanoates. The mcl-PHA containing high HTD monomer contents was found to have both higher crystallinity and improved tensile strength compared with that of typical mcl-PHA.

authors

Liu W,Chen GQ

doi

10.1007/s00253-007-1092-8

subject

Has Abstract

pub_date

2007-10-01 00:00:00

pages

1153-9

issue

5

eissn

0175-7598

issn

1432-0614

journal_volume

76

pub_type

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