期刊
FEBS LETTERS
卷 540, 期 1-3, 页码 234-240出版社
WILEY
DOI: 10.1016/S0014-5793(03)00270-9
关键词
reaction centre; photosynthesis; electron transfer; inactive branch; mutagenesis; spectroscopy
资金
- Biotechnology and Biological Sciences Research Council [B18667] Funding Source: researchfish
- Biotechnology and Biological Sciences Research Council [B18667] Funding Source: Medline
Photo-excitation of membrane-bound Rhodobacter sphaeroides reaction centres containing the mutation Ala M260 to Trp (AM260W) resulted in the accumulation of a radical pair state involving the photo-oxidised primary electron donor (P). This state had a lifetime of hundreds of milliseconds and its formation was inhibited by stigmatellin. The absence of the Q(A) ubiquinone in the AM260W reaction centre suggests that this long-lived radical pair state is P(+)Q(B)(-), although the exact reduction/protonation state of the Q(B) quinone remains to be confirmed. The blockage of active branch (A-branch) electron transfer by the AM260W mutation implies that this P(+)Q(B)(-) state is formed by electron transfer along the so-called inactive branch (B-branch) of reaction centre cofactors. We discuss how further mutations may affect the yield of the P(+)Q(B)(-) state, including a double alanine mutation (EL212A/DL213A) that probably has a direct effect on the efficiency of the low yield electron transfer step from the anion of the B-branch bacteriopheophytin (H-B(-)) to the QB ubiquinone. (C) 2003 Federation of European Biochemical Societies. Published by Elsevier Science B.V. All rights reserved.
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