The redox potential of cytochrome c-552 from Euglena gracilis: A thermodynamic study

Tzipora Goldkorn, Abel Schejter

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

The redox potentials for cytochrome c-552 at different ionic strengths, pH 7, have been determined, together with the thermodynamic parameters of the redox reaction. The effects of the electrostatic media on the redox potential of cytochrome c-552 do not depend on the nature of the ions employed. At 25 °C and pH 7 the observed potentials depend on the ionic strength, I, according to the equation: Eobs o = 0.280 + .525 (I 1 2(I + I 1 2)). The significance of the ionic strength dependence of the redox potentials and their derived thermodynamic parameters are discussed and compared to those of mammalian cytochrome c. It is concluded that the redox potentials for ionic strength approaching zero are not affected by the overall net charge of the proteins; at finite ionic strengths, the protein charges play a very important role in determining the observed redox potentials.

Original languageEnglish (US)
Pages (from-to)39-45
Number of pages7
JournalArchives of Biochemistry and Biophysics
Volume177
Issue number1
DOIs
StatePublished - 1976
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

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