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	Systematic characterization of the covalent interactions between (-)-epigallocatechin gallate and peptides under physiological conditions by mass spectrometry
	Cao, Dong1,2; Zhang, Yangjun1; Zhang, Huihui; Zhong, Liangwei3; Qian, Xiaohong1,2
刊名	Rapid communications in mass spectrometry
	2009-04-01
卷号	23期号:8页码:1147-1157
ISSN号	0951-4198
DOI	10.1002/rcm.3985
通讯作者	Qian, xiaohong(qianxh1@yahoo.com.cn)
英文摘要	(-)-epigallocatechin gallate (egcg) is a major bioactive component in leaves of green tea, and has been widely investigated for its anti-tumor activity. the interaction between egcg and the key peptides or proteins (e.g. glutathione, enzymes) in vivo is thought to be involved in the toxicity and anti-cancer mechanism of egcg. however, the true anti-tumor mechanism of egcg is not clear, and few studies have focused on the reactivity of egcg toward peptides or proteins under physiological conditions (ph 7.4, 37 degrees c). in this work, the covalent interactions between egcg and model peptides containing one or more nucleophilic residues (i.e. arg, cys, met, and alpha-nh(2) of the n-terminus of peptides) under physiological condition were fully characterized using mass spectrometry. it was found that egcg can react with the thiol groups of peptides to form adducts under physiological conditions (ph 7.4, 37 degrees c), even in the absence of the peroxidase/hydrogen peroxide system. besides the thiol groups of peptides, it is firstly reported that egcg also reacts with a-nh(2) of the n-terminus or arginine residues of model peptides to form schiff base adducts, and the methionine residues of model peptides can be easily oxidized by hydrogen peroxide (h(2)o(2)) generated during the process of egcg auto-oxidation to form methionine sulfoxide products. the preference for the reaction of nucleophlic residues of peptides with egcg was determined to have the following order: cys > alpha-nh(2) of the n-terminus > arg. the neutral loss ions of [m+h-170](+) and [m+h-138](+) were detected in all tandem mass spectra of the egcg adducts of peptides, which indicates that these two neutral loss ions can be considered as the characteristic neutral loss ions of peptides modified by egcg. results of the present research provide insights into the toxicology and anti-tumor mechanism of egcg in vivo. copyright (c) 2009 john wiley & sons, ltd.
WOS关键词	TEA POLYPHENOL (-)-EPIGALLOCATECHIN-3-GALLATE ; CELLS IN-VITRO ; GREEN TEA ; CATECHINS ; INHIBITION ; GROWTH ; VIVO ; EPIGALLOCATECHIN-3-GALLATE ; IDENTIFICATION ; THEAFLAVINS
WOS研究方向	Chemistry ; Spectroscopy
WOS类目	Chemistry, Analytical ; Spectroscopy
语种	英语
出版者	JOHN WILEY & SONS LTD
WOS记录号	WOS:000264944500008
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2397309
专题	中国科学院大学
通讯作者	Qian, Xiaohong
作者单位	1.Beijing Inst Radiat Med, Beijing Proteome Res Ctr, State Key Lab Proteom, Beijing 102206, Peoples R China 2.Univ Beijing Inst Technol, Dept Life Sci & Technol, Beijing 100081, Peoples R China 3.Chinese Acad Sci, Grad Univ, Coll Life Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Cao, Dong,Zhang, Yangjun,Zhang, Huihui,et al. Systematic characterization of the covalent interactions between (-)-epigallocatechin gallate and peptides under physiological conditions by mass spectrometry[J]. Rapid communications in mass spectrometry,2009,23(8):1147-1157.
APA	Cao, Dong,Zhang, Yangjun,Zhang, Huihui,Zhong, Liangwei,&Qian, Xiaohong.(2009).Systematic characterization of the covalent interactions between (-)-epigallocatechin gallate and peptides under physiological conditions by mass spectrometry.Rapid communications in mass spectrometry,23(8),1147-1157.
MLA	Cao, Dong,et al."Systematic characterization of the covalent interactions between (-)-epigallocatechin gallate and peptides under physiological conditions by mass spectrometry".Rapid communications in mass spectrometry 23.8(2009):1147-1157.

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