植物の生長調節
Online ISSN : 2189-6305
Print ISSN : 1346-5406
クロロフィルのかたちは機能にどう影響を及ぼすか : Photosystem IIを例に
斉藤 圭亮石北 央
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2015 年 50 巻 2 号 p. 133-138

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We investigated the degrees of chlorin ring deformations of the special pair chlorophylls P_<D1>/P_<D2> in the Photosystem II (PSII) crystal structure, using a quantum mechanical/molecular mechanical approach. We found that (i) the out-of-plane distortion of the PD1 chlorin ring can be described predominantly by a large "doming mode" arising from the axial ligand D1-His198. In contrast, (ii) the deformation of PD2 was caused by a "saddling mode" arising from the D2-Trp191 side chain and the axial ligand D2-His197. However, (iii) the redox potential difference between P_<D1> and P_<D2> was predominantly determined by the PSII electrostatic environment rather than by the degree of the chlorin-ring distortion. (iv) The chlorin ring deformation appears to simply originate from the local steric protein environment of PSII.

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© 2015 一般社団法人植物化学調節学会
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