钙扩展X射线吸收精细结构谱确定了光系统II放氧复合体中的锰-钙簇。
Calcium EXAFS establishes the Mn-Ca cluster in the oxygen-evolving complex of photosystem II.
作者信息
Cinco Roehl M, McFarlane Holman Karen L, Robblee John H, Yano Junko, Pizarro Shelly A, Bellacchio Emanuele, Sauer Kenneth, Yachandra Vittal K
机构信息
Physical Biosciences Division, Melvin Calvin Laboratory, Lawrence Berkeley National Laboratory, Berkeley, California 94720-5230, USA.
出版信息
Biochemistry. 2002 Oct 29;41(43):12928-33. doi: 10.1021/bi026569p.
Abstract
The proximity of Ca to the Mn cluster of the photosynthetic water-oxidation complex is demonstrated by X-ray absorption spectroscopy. We have collected EXAFS data at the Ca K-edge using active PS II membrane samples that contain approximately 2 Ca per 4 Mn. These samples are much less perturbed than previously investigated Sr-substituted samples, which were prepared after Ca depletion. The new Ca EXAFS clearly shows backscattering from Mn at 3.4 A, a distance that agrees with that surmised from previously recorded Mn EXAFS. This result is also consistent with earlier related experiments at the Sr K-edge, using samples that contained functional Sr, that show Mn is approximately 3.5 A distant from Sr. The totality of the evidence clearly advances the notion that the catalytic center of oxygen evolution is a Mn-Ca heteronuclear cluster.
摘要
通过X射线吸收光谱法证明了钙与光合水氧化复合物的锰簇的接近性。我们使用每4个锰含有约2个钙的活性PS II膜样品，在钙K边收集了扩展X射线吸收精细结构（EXAFS）数据。这些样品比之前研究的锶替代样品受到的干扰要小得多，后者是在钙耗尽后制备的。新的钙EXAFS清楚地显示了在3.4埃处来自锰的背散射，这个距离与之前记录的锰EXAFS推测的距离一致。这个结果也与早期在锶K边进行的相关实验一致，这些实验使用的样品含有功能性锶，显示锰与锶的距离约为3.5埃。所有证据清楚地支持了氧进化催化中心是锰 - 钙异核簇的观点。
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