ELECTRON TRANSFER REACTIONS OCCURRING UPON LASER FLASH PHOTOLYSIS OF PHOSPHOLIPID BILAYER SYSTEMS CONTAINING CHLOROPHYLL, BENZOQUINONE AND CYTOCHROMEc‐II. ELECTRICALLY NEUTRAL AND POSITIVELY‐CHARGED VESICLES*

1 May 1988

journal article
research article
Published by Wiley in Photochemistry and Photobiology

Vol. 47 (5) , 751-758
https://doi.org/10.1111/j.1751-1097.1988.tb02775.x

Abstract

Abstract—The primary and secondary electron transfer reactions which occurred upon laser flash photolysis of electrically neutral and positively‐charged lipid bilayer vesicles containing chlorophyll, benzoquinone and cytochromecwere determined by time‐resolved difference spectral and kinetic measurements, and compared with previous results obtained with negatively‐charged vesicles (Y. Fang and G. Tollin,Photochem. Photobiol. 1988). The extent to which oxidized cytochromeccould function as an electron acceptor from triplet state chlorophyll, and reduced cytochromeccould act as an electron donor to chlorophyll cation radical, decreased from negatively‐charged to electrically neutral to positively‐charged vesicles, in agreement with expectations based on changes in the ability of cytochromecto bind to the bilayer. In all three types of vesicles, cytochromecreduction by benzoquinone anion radical occurred in the aqueous phase.

Keywords

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ELECTRON TRANSFER REACTIONS OCCURRING UPON LASER FLASH PHOTOLYSIS OF PHOSPHOLIPID BILAYER SYSTEMS CONTAINING CHLOROPHYLL, BENZOQUINONE AND CYTOCHROME c‐I. NEGATIVELY‐CHARGED VESICLES*
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