Enthalpy/entropy driven activation of the first interquinone electron transfer in bacterial photosynthetic reaction centers embedded in vesicles of physiologically important phospholipids

Francesco Milano, Márta Dorogi, Kornélia Szebényi, László Nagy, Péter Maróti, György Váró, Livia Giotta, Angela Agostiano, Massimo Trotta

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Abstract

The thermodynamics and kinetics of light-induced electron transfer in bacterial photosynthetic RCs are sensitive to physiologically important lipids (phosphatidylcholine, cardiolipin and phosphatidylglycerol) in the environment. The analysis of the temperature-dependence of the rate of the P+QA-QB→ P+QAQB- interquinone electron transfer revealed high enthalpy change of activation in zwitterionic or neutral micelles and vesicles and low enthalpy change of activation in vesicles constituted of negatively charged phospholipids. The entropy change of activation was compensated by the changes of enthalpy, thus the free energy change of activation (≈ 500 meV) did not show large variation in vesicles of different lipids.

Original languageEnglish
Pages (from-to)18-22
Number of pages5
JournalBioelectrochemistry
Volume70
Issue number1
DOIs
Publication statusPublished - Jan 1 2007

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Keywords

  • Interquinone electron transfer
  • Liposomes
  • Reaction centers

ASJC Scopus subject areas

  • Biophysics
  • Physical and Theoretical Chemistry
  • Electrochemistry

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