The effect of multiple phaJ deletions Pseudomonas putida KT2440 on polyhydroxyalkanoates synthesis (part2)
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ABSTRACT: Pseudomonas putida KT2440 is a well-known model organism for the medium chain length (mcl) PHA accumulation. (R)-Specific enoyl-coenzyme A hydratase (PhaJ) was considered to be the main supplier of monomers for PHA synthesis by converting the -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 WT and mutants under different growth conditions were analysed. However, when all three PhaJ homologues were deleted, the mutant still accumulated PHA up to 10.7 % of the cell dry weight (CDW). To identify other potential PHA monomer suppliers by analysing the proteome of the phaJ1maoCphaJ4. The deletion of (R)-3-hydroxydecanoyl-ACP:CoA transacylase (PhaG), which connects de novo FA and PHA synthesis pathways, while causing further 1.8-fold decrease in PHA content, did not abolish PHA accumulation. Further proteome analysis revealed quinoprotein alcohol dehydrogeanses PedE and PedH as potential monomer suppliers, but when these were deleted PHA level remained at 2.2 – 14.8 % CDW depending on the fatty acid used, and whether nitrogen limitation was applied. To identify the other non-specific dehydrogenases supply monomers for PHA synthesis, we analysed the proteome of the sextuple mutant under nitrogen limiting and non-limiting conditions.
INSTRUMENT(S): timsTOF Pro
ORGANISM(S): Pseudomonas Putida Kt2440
SUBMITTER: Si Liu
LAB HEAD: Kevin E. O’Connor
PROVIDER: PXD037937 | Pride | 2023-05-10
REPOSITORIES: Pride
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