The role of TyrD in the electron transfer kinetics in Photosystem II

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• 作者：Malwina Szczepaniak ; Miwa Sugiura ; Alfred R. Holzwarth
• 关键词：Photosystem II ; Electron transfer ; Fluorescence kinetics ; Charge separation ; Tyrosine D ; Photosynthesis ; Picosecond kinetics ; Ultrafast spectroscopy
• 刊名：Biochimica et Biophysica Acta (BBA)/Bioenergetics
• 出版年：2008
• 出版时间：December 2008
• 年：2008
• 卷：1777
• 期：12
• 页码：1510-1517
• 全文大小：885 K

文摘

Redox-active tyrosine (Tyr) D is indirectly involved in controlling the primary electron transfer in PSII. The presence of the oxidized TyrD renders P680⁺ more oxidizing by localizing the charge more on P_D1 and thus facilitates trapping of the excitation energy in PSII. We also conclude that the mechanism of the primary charge separation and stabilization is altered upon Q_A reduction.