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An updated overview on the regulatory circuits of polyhydroxyalkanoates synthesis.

ABSTRACT: Polyhydroxyalkanoates (PHA) are a promising and sustainable alternative to the petroleum-based synthetic plastics. Regulation of PHA synthesis is receiving considerable importance as engineering the regulatory factors might help developing strains with improved PHA-producing abilities. PHA synthesis is dedicatedly regulated by a number of regulatory networks. They tightly control the PHA content, granule size and their distribution in cells. Most PHA-accumulating microorganisms have multiple regulatory networks that impart a combined effect on PHA metabolism. Among them, several factors ranging from global to specific regulators, have been identified and characterized till now. This review is an attempt to categorically summarize the diverse regulatory circuits that operate in some important PHA-producing microorganisms. However, in several organisms, the detailed mechanisms involved in the regulation of PHA synthesis is not well-explored and hence further research is needed. The information presented in this review might help researcher to identify the prevailing research gaps in PHA regulation.

SUBMITTER: Mitra R

PROVIDER: S-EPMC9049629 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature

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An updated overview on the regulatory circuits of polyhydroxyalkanoates synthesis.

Mitra Ruchira R Xu Tong T Chen Guo-Qiang GQ Xiang Hua H Han Jing J

Microbial biotechnology 20210902 5

Polyhydroxyalkanoates (PHA) are a promising and sustainable alternative to the petroleum-based synthetic plastics. Regulation of PHA synthesis is receiving considerable importance as engineering the regulatory factors might help developing strains with improved PHA-producing abilities. PHA synthesis is dedicatedly regulated by a number of regulatory networks. They tightly control the PHA content, granule size and their distribution in cells. Most PHA-accumulating microorganisms have multiple reg ...[more]

PMID: 34473895

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Project description:Pseudomonas putida KT2440 is a well-known model organism for the medium-chain-length (mcl) polyhydroxyalkanoate (PHA) accumulation. (R)-Specific enoyl-coenzyme A hydratase (PhaJ) was considered to be the main supplier of monomers for PHA synthesis by converting the β-oxidation intermediate, trans-2-enoyl-CoA to (R)-3-hydroxyacyl-CoA when fatty acids (FA) are used. Three PhaJ homologues, PhaJ1, PhaJ4 and MaoC, are annotated in P. putida KT2440. To investigate the relationship of fatty acids-PHA metabolism and the role of each PhaJ in PHA biosynthesis in P. putida KT2440, a series of P. putida KT2440 knockouts was obtained. PHA content and monomer composition in wild type (WT) and mutants under different growth conditions were analysed. PhaJ4 was the main monomer supplier for PHA synthesis with FA as sole carbon and energy source, with preference towards C8 and C10 substrate, whereas PhaJ1 showed preference for the C6 substrate. However, when all three PhaJ homologues were deleted, the mutant still accumulated PHA up to 10.7% of the cell dry weight (CDW). The deletion of (R)-3-hydroxydecanoyl-ACP:CoA transacylase (PhaG), which connects de novo FA and PHA synthesis pathways, while causing a further 1.8-fold decrease in PHA content, did not abolish PHA accumulation. Further proteome analysis revealed quinoprotein alcohol dehydrogenases PedE and PedH as potential monomer suppliers, but when these were deleted, the PHA level remained at 2.2-14.8% CDW depending on the fatty acid used and whether nitrogen limitation was applied. Therefore, it is likely that some other non-specific dehydrogenases supply monomers for PHA synthesis, demonstrating the redundancy of PHA metabolism. KEY POINTS: • β-oxidation intermediates are converted to PHA monomers by hydratases PhaJ1, PhaJ4 and MaoC in Pseudomonas putida KT2440. • When these are deleted, the PHA level decreases, but it is not abolished. • PHA non-specific enzyme(s) also contributes to PHA metabolism in KT2440.

Dataset Information

An updated overview on the regulatory circuits of polyhydroxyalkanoates synthesis.

Publications

An updated overview on the regulatory circuits of polyhydroxyalkanoates synthesis.

Similar Datasets

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