Primary electron transfer kinetics in bacterial reaction centers with modified bacteriochlorophylls at the monomeric sites BA,B.
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.
Finkele
U
U
Physik Department, Technischen Universität München, Germany.
Lauterwasser
C
C
Struck
A
A
Scheer
H
H
Zinth
W
W
D001429:Bacteriochlorophylls / Q000737:chemistry* / Q000378:metabolism; D001665:Binding Sites; D004579:Electron Transport; D007700:Kinetics; D010084:Oxidation-Reduction; D010788:Photosynthesis; D012242:Rhodobacter sphaeroides; D013057:Spectrum Analysis; D013329:Structure-Activity Relationship
D001429:Bacteriochlorophylls