Redox-Bohr effect in the nine haem cytochrome from Desulfovibrio desulfuricans 27774

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Abstract

Redox titrations followed by visible spectroscopy were performed at various pH values with the nine-haem cytochrome c from Desulfovibrio desulfuricans ATCC 27774 (Dd27774). Macroscopic midpoint reduction potentials of the haems and pKaox and pKared values of acid-base centres that interact with the redox centres were estimated by using a thermodynamic model, in which the haems are grouped in three sets, and two acid-base centres are considered. The results show that this cytochrome displays redox-Bohr effects in the physiological pH range and that electrostatic effects dominate the macroscopic interactions between the acid-base and redox centres.

Original languageEnglish
Pages (from-to)248-252
Number of pages5
JournalInorganica Chimica Acta
Volume339
DOIs
Publication statusPublished - 15 Nov 2002

Keywords

  • Desulfovibrio desulfuricans
  • Electrostatic models
  • Energy transduction
  • Nine-haem cytochome c
  • Redox titrations
  • Redox-Bohr effect

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