The two-component system PhoPR of Clostridium acetobutylicum is involved in phosphate-dependent gene regulation.

ABSTRACT: The phoPR gene locus of Clostridium acetobutylicum ATCC 824 comprises two genes, phoP and phoR. Deduced proteins are predicted to represent a response regulator and sensor kinase of a phosphate-dependent two-component regulatory system. We analyzed the expression patterns of phoPR in P(i)-limited chemostat cultures and in response to P(i) pulses. A basic transcription level under high-phosphate conditions was shown, and a significant increase in mRNA transcript levels was found when external P(i) concentrations dropped below 0.3 mM. In two-dimensional gel electrophoresis experiments, a 2.5-fold increase in PhoP was observed under P(i)-limiting growth conditions compared to growth with an excess of P(i). At least three different transcription start points for phoP were determined by primer

SUBMITTER: Fiedler T 

PROVIDER: S-EPMC2566200 | biostudies-literature | 2008 Oct

REPOSITORIES: biostudies-literature