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甲醇为探针研究活性光系统Ⅱ次级电子给体Tyr_Z与底物水分子作用机制 被引量:2

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摘要 光系统Ⅱ(PSⅡ)次级电子给体TyrZ担负调控原初电荷分离和水的催化氧化功能.目前有两类TyrZ调控机理模型被提出:一类是TyrZ通过与底物水分子直接作用调控水氧化;另一类是TyrZ处于疏水环境中,不与底物水分子直接作用,而是借助与His190之间氢键强度的变化调控水氧化.本文利用低温电子顺磁共振技术研究与水分子类似的甲醇分子对活性PSⅡ中TyrZ氧化还原特性的影响,发现当Mn簇处于S2和S0态时,甲醇分子的存在能够明显促进TyrZ的低温氧化和TyrZ·的低温还原.理论计算显示:(1)当甲醇分子与Tyr直接作用时会导致Tyr氧化变难;(2)伴随环境极性降低,Tyr的氧化变得容易.综合这些结果,我们推测在活性PSⅡ中甲醇分子不与TyrZ直接作用,甲醇对TyrZ的低温氧化及TyrZ·的低温还原的促进作用可能是由于甲醇分子替换PSⅡ内部的水分子,降低了TyrZ-His190周围环境的极性,使TyrZ与His190之间的氢键强度增加所致.鉴于甲醇分子与水的类似性,以上结果支持我们最近提出的活性PSⅡ中TyrZ不与水分子直接作用的观点.
出处 《科学通报》 EI CAS CSCD 北大核心 2010年第1期26-30,共5页 Chinese Science Bulletin
基金 中国科学院和国家自然科学基金资助项目(批准号:20403024 30570423 20973186)
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同被引文献19

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