PMID: 2108123Apr 1, 1990Paper

Roles of CfxA, CfxB, and external electron acceptors in regulation of ribulose 1,5-bisphosphate carboxylase/oxygenase expression in Rhodobacter sphaeroides

Journal of Bacteriology
P L HallenbeckS Kaplan

Abstract

The Rhodobacter sphaeroides genome contains two unlinked genetic regions each encoding a series of proteins involved in CO2 fixation which include phosphoribulokinase (prkA and prkB) and ribulose 1,5-bisphosphate carboxylase/oxygenase (rbcLS and rbcR) (P. L. Hallenbeck and S. Kaplan, Photosynth. Res. 19:63-71, 1988; F. R. Tabita, Microbiol. Rev. 52:155-189, 1988). We examined the effect of CO2 in the presence and absence of an alternate electron acceptor, dimethyl sulfoxide, on the expression of rbcR and rbcLS in photoheterotrophically grown R. sphaeroides. The expression of both rbcR and rbcLS was shown to depend on the CO2 concentration when succinate was used as the carbon source. It was also demonstrated that CO2 fixation is critical for photoheterotrophic growth but could be replaced by the alternative reduction of dimethyl sulfoxide to dimethyl sulfide. Dimethyl sulfoxide severely depressed both rbcR and rbcLS expression in cells grown photoheterotrophically at CO2 concentrations of 0.05% or greater. However, cells grown photoheterotrophically in the absence of exogenous CO2 but in the presence of dimethyl sulfoxide had intermediate levels of expression of rbcL and rbcR, suggesting partially independent control by limitin...Continue Reading

References

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Citations

Dec 31, 1997·FEMS Microbiology Reviews·B Kusian, B Bowien
Aug 23, 2011·Applied and Environmental Microbiology·Wayne S KonturTimothy J Donohue
Jan 19, 1999·Annual Review of Microbiology·J M ShivelyW G Meijer
Oct 18, 2011·Applied and Environmental Microbiology·Tobias J Erb
Jun 19, 2010·Proceedings of the National Academy of Sciences of the United States of America·James B McKinlay, Caroline S Harwood
Jul 21, 2005·Journal of Bacteriology·Christine L TavanoTimothy J Donohue
Mar 13, 2002·Journal of Bacteriology·Mary A Tichi, F Robert Tabita
Feb 1, 1997·Journal of Bacteriology·J L Gibson, F R Tabita

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