Structural-functional role of chloride in photosystem II.

Structural-functional role of chloride in photosystem II.
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DOI:
10.1021/bi200685w
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发表时间:
2011-07-26
期刊:
影响因子:
2.9
通讯作者:
Batista, Victor S.
Batista, Victor S.
中科院分区:
生物学3区
文献类型:
--
作者:
Rivalta, Ivan;Amin, Muhamed;Luber, Sandra;Vassiliev, Serguei;Pokhrel, Ravi;Umena, Yasufumi;Kawakami, Keisuke;Shen, Jian-Ren;Kamiya, Nobuo;Bruce, Doug;Brudvig, Gary W.;Gunner, M. R.;Batista, Victor S.

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光系统II(PSII)中的氯离子结合是光合水氧化的必要条件。然而,氯离子的功能作用和可能的结合位点,在氧的演变,仍然存在争议。本文根据PSII在1.9 nm分辨率下的X射线晶体结构中揭示的氯离子结合位点,研究了氯离子的功能。我们发现,氯耗尽诱导D2-K317和D1-D 61之间的盐桥的形成,可以抑制质子转移到管腔。
Chloride binding in photosystem II (PSII) is essential for photosynthetic water oxidation. However, the functional roles of chloride and possible binding sites, during oxygen evolution, remain controversial. This paper examines the functions of chloride based on its binding site revealed in the X-ray crystal structure of PSII at 1.9 Å resolution. We find that chloride depletion induces formation of a salt-bridge between D2-K317 and D1-D61 that could suppress proton transfer to the lumen.
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