Primary electron transfer kinetics in bacterial reaction centers with modified bacteriochlorophylls at the monomeric sites BA,B.

Finkele, Ulrich and Lauterwasser, Christoph and Struck, A. and Scheer, Hugo and Zinth, Wolfgang (1992): Primary electron transfer kinetics in bacterial reaction centers with modified bacteriochlorophylls at the monomeric sites BA,B. In: Proceedings of the National Academy of Science of the United States of America, Vol. 89, No. 20: pp. 9514-9518

Abstract

The primary electron transfer has been investigated by femtosecond time-resolved absorption spectroscopy in two chemically modified reaction centers (RC) of Rhodobacter sphaeroides, in which the monomeric bacteriochlorophylls BA and BB have both been exchanged by 13(2)-hydroxybacteriochlorophyll a or [3-vinyl]-13(2)-hydroxybacteriochlorophyll a. The kinetics of the primary electron transfer are not influenced by the 13(2)-hydroxy modification. In RCs containing [3-vinyl]-13(2)-hydroxybacteriochlorophyll a the primary rate is reduced by a factor of 10.

• Item Type: Article
• Collections: Physics; Biology
• Subjects: 500 Science > 570 Life sciences; biology