Reaction Center of Photosystem II with No Peripheral Pigments in D2 Allows Secondary Electron Transfer in D1

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• 作者：Juan B. Arellano ; Sergio Gonz&aacute ; lez-Pé ; rez ; Frantisek Vacha ; Thor Bernt Mel ; K. Razi Naqvi
• 刊名：Biochemistry
• 出版年：2007
• 出版时间：December 25, 2007
• 年：2007
• 卷：46
• 期：51
• 页码：15027 - 15032
• 全文大小：149K
• 年卷期：v.46,no.51(December 25, 2007)
• ISSN：1520-4995

文摘

A pigment-deficient reaction center of photosystem II (PSII)-with all the core pigments (twomolecules of chlorophyll a and one of pheophytin a in each D protein) but with only one molecule eachof peripheral chlorophyll a (Chlz) and -carotene (Car)-has been investigated by pump-probe spectroscopy.The data imply that Car and Chlz are both bound to D1. The absence of Car and Chlz in D2 allows theunprecedented observation of secondary electron transfer in D1 of PSII reaction centers at room temperature.The absorption band of the Car cation in D1 () peaks around 910 nm (as against 990 nm for ),and its positive hole is shared by Chlz_D1, whereas can disappear by capturing an electron fromChlz_D2.