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	Molecular reorganization induced by Ca2+ of plant photosystem I reconstituted into phosphatidylglycerol liposomes
	Wu, F ; Yang, SL ; Su, XH ; Gong, YD ; Kuang, TY
	2010-05-11 ; 2010-05-11
关键词	Ca2+ molecular organization phosphatidylglycerol photosystem I pigment protein secondary structure LIGHT-HARVESTING COMPLEX PROTEIN SECONDARY STRUCTURE CIRCULAR-DICHROISM CHLAMYDOMONAS-REINHARDTII CHLOROPHYLL-PROTEINS SPECTROSCOPY ABSORPTION ANTENNA OLIGOMERIZATION ORGANIZATION Biochemistry & Molecular Biology Biophysics
中文摘要	The interaction of divalent cations with biomembranes is important for a number of biological processes. In this study, the regulatory effect of Ca2+ on the interaction between plant spinach photosystem I (PSI) particles and negatively charged lipid phosphatidylglycerol (PG) was investigated by circular dichroism (CD) spectroscopy. It was found that in the absence of CaCl2, PG causes an increase in alpha-helix and a decrease in disordered conformations of protein secondary structures of PSI, the P-sheet and turns being almost unaffected. Meanwhile, the same effect also enhances the excitonic interactions relating to Ch1 a and Ch1 b from the PSI core complex and external antenna light-harvesting complex (LHCI). By contrast, in the presence of CaCl2, PG hardly interferes with the structure of the proteins' skeleton of PSI, but it can depress the excitonic interactions for Chl b of LHCI and for PSI core complex Chl a at (-) 433.5 nm of the CD signal which is accompanied by a blue shift of its peak. It is most likely that the neutralization of the phosphate groups in the PSI-PG complex and the negative surface charges of PSI, and partial dehydration in the vicinity of the ester C=O region of the PG polar head group by the Ca-ions modify the interaction between PSI and PG, thereby inducing molecular reorganization of protein and pigments within both the external antenna LHCI and PSI core complex in proteoliposomes. (c) 2005 Elsevier Ireland Ltd. All rights reserved.
语种	英语 ; 英语
出版者	ELSEVIER IRELAND LTD ; CLARE ; ELSEVIER HOUSE, BROOKVALE PLAZA, EAST PARK SHANNON, CO, CLARE, 00000, IRELAND
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/26576]
专题	清华大学
推荐引用方式 GB/T 7714	Wu, F,Yang, SL,Su, XH,et al. Molecular reorganization induced by Ca2+ of plant photosystem I reconstituted into phosphatidylglycerol liposomes[J],2010, 2010.
APA	Wu, F,Yang, SL,Su, XH,Gong, YD,&Kuang, TY.(2010).Molecular reorganization induced by Ca2+ of plant photosystem I reconstituted into phosphatidylglycerol liposomes..
MLA	Wu, F,et al."Molecular reorganization induced by Ca2+ of plant photosystem I reconstituted into phosphatidylglycerol liposomes".(2010).

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