纯化的光系统II膜组分中锰氧气释放复合物的扩展X射线吸收精细结构（EXAFS）研究。S1和S2状态。
An e.x.a.f.s. study of the manganese O2-evolving complex in purified Photosystem II membrane fractions. The S1 and S2 states.
作者信息
MacLachlan D J, Hallahan B J, Ruffle S V, Nugent J H, Evans M C, Strange R W, Hasnain S S
机构信息
Department of Biology, University College London, U.K.
出版信息
Biochem J. 1992 Jul 15;285 ( Pt 2)(Pt 2):569-76. doi: 10.1042/bj2850569.
Abstract
Manganese K-edge X-ray spectra have been obtained for Photosystem II samples isolated using Triton X-100 detergent and samples further purified by n-heptyl beta-D-thioglucoside detergent treatment to remove light-harvesting polypeptides and low-affinity calcium. The structure of the manganese complex is very similar for the two detergent preparations used. Analysis of the e.x.a.f.s. spectra for samples in the S1 and S2 states indicate changes in bond lengths for the shells of oxygen/nitrogen atoms. For the S1 state, oxygen shells at 0.181 and 0.193 nm (1.81 and 1.93 A) were observed and one manganese shell at 0.270 nm (2.70A). In the S2 state the oxygen bond lengths are longer at 0.184 and 0.200 nm (1.84 and 2.00 A). Additionally a shell of scatterers at 0.37 nm (3.7 A) was observed in both states which could be fitted to models with calcium scatterers at this distance.
摘要
已获得使用Triton X-100去污剂分离的光系统II样品以及通过正庚基-β-D-硫代葡萄糖苷去污剂处理进一步纯化以去除捕光多肽和低亲和力钙的样品的锰K边X射线光谱。对于所使用的两种去污剂制剂，锰配合物的结构非常相似。对处于S1和S2状态的样品的扩展X射线吸收精细结构（e.x.a.f.s.）光谱分析表明，氧/氮原子壳层的键长发生了变化。对于S1状态，观察到氧壳层在0.181和0.193纳米（1.81和1.93埃），以及一个锰壳层在0.270纳米（2.70埃）。在S2状态下，氧键长更长，为0.184和0.200纳米（1.84和2.00埃）。此外，在两种状态下均观察到一个位于0.37纳米（3.7埃）的散射体壳层，该壳层可以与在此距离处有钙散射体的模型相拟合。
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