期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 288, 期 1, 页码 99-109出版社
ELSEVIER
DOI: 10.1074/jbc.M112.416354
关键词
-
资金
- National Institutes of Health [EY021193]
- China Scholarship Council
Some mutants of human gamma D-crystallin are closely linked to congenital cataracts, although the detailed molecular mechanisms of mutant-associated cataract formation are generally not known. Here we report on a recently discovered gamma D-crystallin mutant (W42R) that has been linked to autosomal dominant, congenital cataracts in a Chinese family. The mutant protein is much less soluble and stable than wild-type gamma D-crystallin. We solved the crystal structure of W42R at 1.7 angstrom resolution, which revealed only minor differences from the wild-type structure. Interestingly, the W42R variant is highly susceptible to protease digestion, suggesting the presence of a small population of partially unfolded protein. This partially unfolded species was confirmed and quantified by NMR spectroscopy. Hydrogen/deuterium exchange experiments revealed chemical exchange between the folded and unfolded species. Exposure of wild-type gamma D-crystallin to UV caused damage to the N-terminal domain of the protein, resulting in very similar proteolytic susceptibility as observed for the W42R mutant. Altogether, our combined data allowed us to propose a model for W42R pathogenesis, with the W42R mutant serving as a mimic for photodamaged gamma D-crystallin involved in age-related cataract.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据