X-RAY-DETECTION OF THE PERIOD-4 CYCLING OF THE MANGANESE CLUSTER IN PHOTOSYNTHETIC WATER OXIDIZING ENZYME

被引:199
作者
ONO, T
NOGUCHI, T
INOUE, Y
KUSUNOKI, M
MATSUSHITA, T
OYANAGI, H
机构
[1] MEIJI UNIV,SCH SCI & TECHNOL,KANAGAWA 214,JAPAN
[2] NATL LAB HIGH ENERGY PHYS,PHOTON FACTORY,TSUKUBA,IBARAKI 305,JAPAN
[3] ELECTROTECH LAB,SAKURA,IBARAKI 305,JAPAN
关键词
D O I
10.1126/science.258.5086.1335
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
X-ray absorption near-edge structure spectra of the manganese (Mn) cluster in physiologically native intermediate states of photosynthetic water oxidation induced by short laser flash were measured with a compact heat-insulated chamber equipped with an x-ray detector near the sample surface. The half-height energy of the Mn K-edge showed a period-four oscillation dependent on cycling of the Joliot-Kok's oxygen clock. The flash number-dependent shift in the Mn K-edge suggests that the Mn cluster is oxidized by one electron upon the S0-to-S1, S1-to-S2, and S2-to-S3 transitions and then reduced upon the S3-to-S0 transition that releases molecular oxygen.
引用
收藏
页码:1335 / 1337
页数:3
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