Finkele, Ulrich and Lauterwasser, Christoph and Zinth, Wolfgang and Gray, Kevin A. and Oesterhelt, Dieter
Role of tyrosine M210 in the initial charge separation of reaction centers of Rhodobacter sphaeroides.
In: Biochemistry, No. 29: pp. 8517-8521
Femtosecond spectroscopy was used in combination with site-directed mutagenesis to study the
influence of tyrosine M210 (YM210) on the primary electron transfer in the reaction center of Rhodobacter
sphaeroides. The exchange of YM210 to phenylalanine caused the time constant of primary electron transfer
to increase from 3.5 f 0.4 ps to 16 f 6 ps while the exchange to leucine increased the time constant even
more to 22 f 8 ps. The results suggest that tyrosine M210 is important for the fast rate of the primary