PMID: 8611589Feb 15, 1996Paper

The membrane-bound cytochrome cy of Rhodobacter capsulatus can serve as an electron donor to the photosynthetic reaction of Rhodobacter sphaeroides

Biochimica Et Biophysica Acta
F E JenneyF Daldal

Abstract

Rhodobacter capsulatus has two different pathways for reduction of the photo-oxidized reaction center, one using water-soluble cytochrome c2, the other via membrane-associated cytochrome cy. Rhodobacter sphaeroides differs in that it lacks a cytochrome cy homologue capable of functioning in photosynthetic electron transfer; cytochrome c2 is thus the sole electron carrier, and is required for photosynthetic (Ps+) growth. Genetic evidence indicates that cytochrome cy of R. capsulatus can complement a Ps- cytochrome-c2-deficient mutant of R sphaeroides (Jenny, F.E. and Daldal, F (1993). EMBO J. 12, 1283-1292). Here, we show that it transfers electrons from cytochrome bc1 complex to the reaction center in R. sphaeroides, albeit at a lower rate than that catalyzed by the endogenous cytochrome c2. When cytochrome cy is expressed in R. sphaeroides in the presence of cytochrome c2, there is an increase in the amount of photo-oxidizable c-type cytochrome. In the absence of cytochrome c2, electron transfer via cytochrome cy shows significantly different kinetics for reaction center reduction and cytochrome c oxidation. These findings further establish that cytochrome cy, the electron carrier permitting soluble cytochrome c2-independent p...Continue Reading

References

Feb 1, 1992·Archives of Biochemistry and Biophysics·M CaffreyF Daldal
Dec 17, 1987·Biochimica Et Biophysica Acta·R C Prince, F Daldal
Mar 15, 1994·Biochemistry·J A García-HorsmanR B Gennis
Apr 1, 1986·Proceedings of the National Academy of Sciences of the United States of America·F DaldalR C Prince

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Citations

Apr 14, 1999·Proceedings of the National Academy of Sciences of the United States of America·H MyllykallioF Daldal
Jan 5, 2011·BMC Microbiology·Anish BavishiMadhusudan Choudhary
Sep 18, 1997·Microbiology and Molecular Biology Reviews : MMBR·L Thöny-Meyer

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