PMID: 6058May 14, 1976

pH dependence of the oxidation-reduction potential of cytochrome c2

Biochimica Et Biophysica Acta
G W PettigrewM D Kamen

Abstract

The pH dependence of the spectra and of the oxidation-reduction potential of three cytochromes c2, from Rhodopseudomonas capsulata, Rhodopseudomonas sphaeroides and Rhodomicrobium vannielii, were studied. A single alkaline pK was observed for the spectral changes in all three ferricytochromes. In Rps. capsulata cytochrome c2 this spectroscopic pK corresponds to the pK observed in the dependence of oxidation-reduction potential on pH. For the other two cytochromes the oxidation-reduction potential showed a complex dependency on pH which can be fitted to theoretical curves involving three ionizations. The third ionization corresponds to the ionization observed in the spectroscopic studies but the first two occur without changes in the visible spectra. The possible structural bases for these ionizations are discussed.

References

Sep 9, 1975·Biochimica Et Biophysica Acta·E StellwagenH Wilgus
Jul 1, 1974·Proceedings of the National Academy of Sciences of the United States of America·H Wilgus, E Stellwagen
Aug 1, 1972·Proceedings of the National Academy of Sciences of the United States of America·R J Kassner
Dec 3, 1971·Biochemical and Biophysical Research Communications·R K Gupta, S H Koenig
Jan 1, 1967·Biochimica Et Biophysica Acta·J A Orlando
Jan 15, 1972·FEBS Letters·R M. KellerK Wüthrich
May 1, 1955·Biochimica Et Biophysica Acta·M D Kamen, L P VERNON
Apr 24, 1952·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·H E DAVENPORT, R HILL
Dec 17, 2011·Current Medicinal Chemistry·K C ShengV Apostolopoulos

Citations

Nov 1, 2008·Journal of Bioenergetics and Biomembranes·Haibo ZhangChristopher C Moser
May 1, 1988·Proceedings of the National Academy of Sciences of the United States of America·L P Yu, G M Smith
Mar 22, 1988·Biochemistry·L P Yu, G M Smith
Sep 1, 1982·European Journal of Biochemistry·J J MouraA V Xavier

Related Concepts

Cytochrome c Group
Hydrogen-Ion Concentration
Mathematics
Mitochondria
Oxidation-Reduction
Potentiometry
Rhodopseudomonas
Rhodobacter sphaeroides
Rhodospirillaceae

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