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- W2106974324 abstract "Phasins play an important role in the formation of poly(3-hydroxybutyrate) [poly(3HB)] granules and affect their size. Recently, three homologues of the phasin protein PhaP1 were identified in Ralstonia eutropha strain H16. The functions of PhaP2, PhaP3 and PhaP4 were examined by analysis of R. eutropha H16 deletion strains (DeltaphaP1, DeltaphaP2, DeltaphaP3, DeltaphaP4, DeltaphaP12, DeltaphaP123 and DeltaphaP1234). When cells were grown under conditions permissive for poly(3HB) accumulation, the wild-type strain and all single-phasin negative mutants (DeltaphaP2, DeltaphaP3 and DeltaphaP4), with the exception of DeltaphaP1, showed similar growth and poly(3HB) accumulation behaviour, and also the size and number of the granules were identical. The single DeltaphaP1 mutant and the DeltaphaP12, DeltaphaP123 and DeltaphaP1234 mutants showed an almost identical growth behaviour; however, they accumulated poly(3HB) at a significantly lower level than wild-type and the single DeltaphaP2, DeltaphaP3 or DeltaphaP4 mutants. Gel-mobility-shift assays and DNaseI footprinting experiments demonstrated the capability of the transcriptional repressor PhaR to bind to a DNA region +36 to +46 bp downstream of the phaP3 start codon. The protected sequence exhibited high similarity to the binding sites of PhaR upstream of phaP1, which were identified recently. In contrast, PhaR did not bind to the upstream or intergenic regions of phaP2 and phaP4, thus indicating that the expression of these two phasins is regulated in a different way. Our current model for the regulation of phasins in R. eutropha strain H16 was extended and confirmed." @default.
- W2106974324 created "2016-06-24" @default.
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- W2106974324 date "2005-03-01" @default.
- W2106974324 modified "2023-10-18" @default.
- W2106974324 title "Influence of homologous phasins (PhaP) on PHA accumulation and regulation of their expression by the transcriptional repressor PhaR in Ralstonia eutropha H16" @default.
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- W2106974324 doi "https://doi.org/10.1099/mic.0.27613-0" @default.
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