Initial electron transfer in photosynthetic reaction centers of Rhodobacter capsulatus mutants

The stimulated emission decay time constants were measured for a series of Rhodobacter capsulatus reaction centers with site-specific mutations at the symmetry related locations M208 and L181. We report the first mutant (Phe L181 → Tyr) that exhibits an initial electron transfer rate faster than the...

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Bibliographic Details
Published in:Chemical physics letters 1991-01, Vol.176 (3), p.366-372
Main Authors: Chan, Chi-Kin, X-Q Chen, Lin, DiMagno, Theodore J., Hanson, Deborah K., Nance, Sharron L., Schiffer, Marianne, Norris, James R., Fleming, Graham R.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
General aspects
Theories. Reviews
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Summary:The stimulated emission decay time constants were measured for a series of Rhodobacter capsulatus reaction centers with site-specific mutations at the symmetry related locations M208 and L181. We report the first mutant (Phe L181 → Tyr) that exhibits an initial electron transfer rate faster than the native organism at 295 K, and determine that the tyrosine at position M208 cannot be fully responsible for the unidirectionality of electron transfer.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(91)90045-B