FLASH-INDUCED XANES SPECTROSCOPY FOR THE CA-DEPLETED MN-CLUSTER IN THE PHOTOSYNTHETIC O2-EVOLVING ENZYME

被引：16

作者：

ONO, TA

NOGUCHI, T

INOUE, Y

KUSUNOKI, M

YAMAGUCHI, H

OYANAGI, H

机构：

[1] MEIJI UNIV,SCH SCI & TECHNOL,KAWASAKI,KANAGAWA 214,JAPAN

[2] ELECTROTECH LAB,TSUKUBA,IBARAKI 305,JAPAN

来源：

FEBS LETTERS | 1993年 / 330卷 / 01期

基金：

日本科学技术振兴机构;

关键词：

O2; EVOLUTION; MN-CLUSTER; PHOTOSYSTEM-II; X-RAY ABSORPTION; CALCIUM; EPR;

D O I：

10.1016/0014-5793(93)80912-E

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Flash-induced changes of the Mn K-edge absorption spectra have been studied in the oxygen-evolving complex depleted of Ca. The Mn K-edge energy for the Ca-depleted S1-state was lower by 1.5 eV than that for the normal S1-state. The K-edge energy upshifted by 1 eV after one flash, indicative of an oxidation of Mn. After two flashes, the K-edge was elevated as well by 0.4 eV, and then reached a steady-state high level after continuous illumination where the K-edge energy was higher by 0.9 eV than that after one flash. The results indicate that the Mn-cluster and/or its direct ligand could be oxidized up to two electrons but further events are blocked.

引用

页码：28 / 30

页数：3

共 23 条

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