REGULATION BY LOCALIZED PROTONS OF PHOTOSYSTEM-II PHOTOCHEMICAL EFFICIENCY

被引：7

作者：

EHRENHEIM, AM ^{[1
]}

VIANELLI, A ^{[1
]}

FINAZZI, G ^{[1
]}

FORTI, G ^{[1
]}

机构：

[1] UNIV MILAN, CNR,CTR BIOL CELLULARE & MOLEC PIANTE, DIPARTIMENTO BIOL,VIA CELORIA 26, I-20133 MILAN, ITALY

来源：

BIOCHIMICA ET BIOPHYSICA ACTA | 1992年 / 1100卷 / 03期

关键词：

LIGHT HARVESTING; REACTION CENTER; LOCALIZED PROTON; PROTON EFFECT; PHOTOSYSTEM-II;

D O I：

10.1016/0167-4838(92)90485-V

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：

In a previous report (Ehrenheim et al. (1991) Biochim. Biophys. Acta 1059, 106-110) it was shown that membrane-localized protons inhibit energy utilization at the Photosystem II reaction centre. We report here that the stimulation of PS II energy utilization due to the removal of such protons by nigericin is dependent on the wavelength of the actinic modulated light. Maximal fluorescence is not affected by nigericin. The effectiveness of the different uncouplers is related to their lipophilicity. These observations led us to conclude that electron-transport-dependent localization of protons in the membrane lowers the efficiency of energy transfer to the PS II reaction centre. It is also shown that the effect of uncouplers on PS II is not related to inhibition of electron recycling around PS II or cation-dependent energy spillover.

引用

页码：299 / 302

页数：4

共 18 条

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