Linked Life Data

4064730

Source:http://linkedlifedata.com/resource/pubmed/id/4064730

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pubmed-article:4064730pubmed:abstractTextIn the bovine lens the gamma IV-crystallin fraction is a principal determinant of the phase separation and opacification temperature, Tc (Siezen et al, Proc. Natl. Acad. Sci. USA 82, 1985, 1701). We have now measured the effect on Tc of purified gamma IV-crystallin solutions produced by a variety of reagents which affect protein-protein, protein-water and water-water interactions. Ionic strengths less than physiological increase Tc dramatically, while higher ionic strength has very little effect. Calcium ion concentrations up to 8 mM produce no change in Tc. Glycerol and acrylamide both depress Tc linearly with reagent concentrations; Tc depression of gamma IV-crystallin by these compounds is quantitatively the same as for whole lens. Sulfhydryl reducing agents such as glutathione and dithiothreitol lower Tc, while hydrogen peroxide increases Tc. Changes in opacification temperature of gamma IV-crystallin produced by oxidizing and reducing agents are time-dependent and highly non-linear with reagent concentration. Our results clearly show that bovine gamma IV-crystallin is an important target protein for various reagents which are known perturbants of the opacification temperature of whole lens. The relevance of these findings to human diabetic and senile cataract formation is discussed.lld:pubmed
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pubmed-article:4064730pubmed:articleTitleControlled modulation of the phase separation and opacification temperature of purified bovine gamma IV-crystallin.lld:pubmed
pubmed-article:4064730pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:4064730pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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