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pubmed-article:3409984pubmed:abstractTextMixed disulfide between lens crystallin and glutathione has been observed in human cataracts and could be formed in vitro by thiol-disulfide exchange reaction. The glutathionyl crystallins have been reported to become partially unfolded. The present paper reports the conformational destabilization by the mixed disulfide formation in calf alpha- and gamma-II crystallin. The conformational stability was studied by the denaturants urea and guanidine hydrochloride (Gdn-HCl), and by proteolytic degradation. The denaturation curves of both urea and Gdn-HCl shift to lower denaturant concentration for crystallins of glutathione mixed disulfide. The decrease in conformational stability is estimated to be 0.22- and 0.92 kcal mol-1 for modified alpha- and gamma-II crystallin, respectively. Proteolytic digestion also shows a faster rate of degradation for the modified crystallins. These results indicate that mixed disulfide destabilizes the crystallin conformation. The destabilization may make crystallins more susceptible to changes as observed in aging lenses.lld:pubmed
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pubmed-article:3409984pubmed:authorpubmed-author:LiangJ NJNlld:pubmed
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pubmed-article:3409984pubmed:pagination17-25lld:pubmed
pubmed-article:3409984pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:3409984pubmed:year1988lld:pubmed
pubmed-article:3409984pubmed:articleTitleDestabilization of lens protein conformation by glutathione mixed disulfide.lld:pubmed
pubmed-article:3409984pubmed:affiliationHowe Laboratory of Ophthalmology, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston 02114.lld:pubmed
pubmed-article:3409984pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:3409984pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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