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, P. Maróti, G. Váró, Livia Giotta, Angela Agostiano, Massimo Trotta

Research output: Contribution to journalArticle

9 Citations (Scopus)

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 2007

Fingerprint

Photosynthetic Reaction Center Complex Proteins
Phospholipids
Entropy
Enthalpy
electron transfer
enthalpy
Chemical activation
activation
Electrons
entropy
Lipids
Phosphatidylglycerols
Cardiolipins
Micelles
Phosphatidylcholines
Thermodynamics
lipids
Light
Temperature
Free energy

Keywords

  • Interquinone electron transfer
  • Liposomes
  • Reaction centers

ASJC Scopus subject areas

  • Biophysics
  • Electrochemistry
  • Physical and Theoretical Chemistry

Cite this

Enthalpy/entropy driven activation of the first interquinone electron transfer in bacterial photosynthetic reaction centers embedded in vesicles of physiologically important phospholipids. / Milano, Francesco; Dorogi, Márta; Szebényi, Kornélia; Nagy, László; Maróti, P.; Váró, G.; Giotta, Livia; Agostiano, Angela; Trotta, Massimo.

In: Bioelectrochemistry, Vol. 70, No. 1, 01.2007, p. 18-22.

Research output: Contribution to journalArticle

Milano, Francesco ; Dorogi, Márta ; Szebényi, Kornélia ; Nagy, László ; Maróti, P. ; Váró, G. ; Giotta, Livia ; Agostiano, Angela ; Trotta, Massimo. / Enthalpy/entropy driven activation of the first interquinone electron transfer in bacterial photosynthetic reaction centers embedded in vesicles of physiologically important phospholipids. In: Bioelectrochemistry. 2007 ; Vol. 70, No. 1. pp. 18-22.
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AU - Nagy, László

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