Role of cysteine residues in the enhancement of chaperone function in methylglyoxal-modified human αA-crystallin

被引：0
作者：
Santosh R. Kanade
NagaRekha Pasupuleti
Ram H. Nagaraj
机构：
[1] Case Western Reserve University,Department of Ophthalmology and Visual Sciences
来源：
Molecular and Cellular Biochemistry | 2009年 / 322卷
关键词：
Crystallin; Chaperone; Methylglyoxal; Hemithioacetal; Cysteine; Site-directed mutagenesis;
D O I：
暂无
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学科分类号：
摘要：
We have previously demonstrated that the reaction of a physiological dicarbonyl, methylglyoxal (MGO) enhances the chaperone function of human αA-crystallin. MGO can react with cysteine, arginine, and lysine residues in proteins. Although the role of arginine and lysine residues in the enhancement of chaperone function has been investigated, the role of cysteine residues is yet to be determined. In this study, we have investigated the effect of MGO modification on the structure and chaperone function of αA-crystallin mutant proteins in which C131 and C142 were replaced either individually or simultaneously with isoleucine. MGO-modification resulted in improved chaperone function in all three αA-crystallin mutants, including the cysteine-free double mutant. The enhanced chaperone function was due to increased surface hydrophobicity and increased binding of client proteins. These results suggest that the two cysteine residues, even though they could be modified, do not take part in the MGO-induced improvement in the chaperone function of human αA-crystallin.
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页码：185 / 191
页数：6
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