Low-temperature electron transfer suggests two types of Q(A) in intact photosystem II

doi:10.1016/j.bbabio.2009.12.001

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	Low-temperature electron transfer suggests two types of Q(A) in intact photosystem II
	Bao, Han; Zhang, Chunxi; Ren, Yanan; Zhao, Jingquan
刊名	BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
	2010-03-01
卷号	1797 期号:3 页码:339-346
关键词	Photosystem Ii q(a) Tyr(z) Side-path Electron Donor Electron Transfer Epr
ISSN号	0005-2728
DOI	10.1016/j.bbabio.2009.12.001
英文摘要	The correlation between the reduction of Q(A) and the oxidation of Tyr(z) or Car/Chl(z)/Cyt(b559) in spinach PSII enriched membranes induced by visible light at 10 K is studied by using electron paramagnetic resonance spectroscopy. Similar g = 1.95-1.86 Q(A)(-center dot)EPR signals are observed in both Mn-depleted and intact samples, and both signals are long lived at low temperatures. The presence of PPBQ significantly diminished the light induced EPR signals from Q(A)(-center dot), Car(+center dot)/Chl(+center dot) and oxidized Cyt(b559), while enhancing the amplitude of the S(1)Tyr(z)(center dot) EPR signal in the intact PSII sample. The quantification and stability of the g = 1.95-1.86 EPR signal and signals arising from the oxidized Tyrz and the side-path electron donors, respectively, indicate that the EPR-detectable g = 1.95-1.86 Q(A)(-center dot) signal is only correlated to reaction centers undergoing oxidation of the side-path electron donors (Car/Chl(z)/Cyt(b559)), but not of Tyr(z). These results imply that two types of Q(A)(-center dot) probably exist in the intact PSII sample. The structural difference and possible function of the two types of QA are discussed. (C) 2009 Elsevier B.V. All rights reserved.
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000274772900002
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/70579]
专题	中国科学院化学研究所
通讯作者	Zhang, Chunxi
作者单位	Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Lab Photochem, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Bao, Han,Zhang, Chunxi,Ren, Yanan,et al. Low-temperature electron transfer suggests two types of Q(A) in intact photosystem II[J]. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS,2010,1797(3):339-346.
APA	Bao, Han,Zhang, Chunxi,Ren, Yanan,&Zhao, Jingquan.(2010).Low-temperature electron transfer suggests two types of Q(A) in intact photosystem II.BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS,1797(3),339-346.
MLA	Bao, Han,et al."Low-temperature electron transfer suggests two types of Q(A) in intact photosystem II".BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1797.3(2010):339-346.