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- W2057703032 abstract "Incubation of the material secreted by activated platelets leads to the formation of disulfide-linked dimers and multimers of one of the proteins, thrombospondin. To determine whether these complexes formed as a result of thiol-disulfide exchange (no change in the number of thiols) or of oxidation of thiols (a decrease in the number of thiols), the number of thiols in TSP was measured during formation of multimers. The number of thiols increased from about 3/mol to 4.8/mol. The half-time for the disappearance of monomers of thrombospondin was fourfold greater than the half-time for appearance of new thiols. The appearance of new thiols, as well as the formation of multimers, was inhibited by Ca2+. The appearance of new thiols was reversible; addition of Ca2+ reversed the process, and at pH 8, but not at pH 6 or 7, the appearance of new thiols spontaneously reversed. No new thiols formed during incubation of partially purified thrombospondin or after the supernatant solution had been treated with activated thiol-Sepharose to remove reactive thiol compounds. It is concluded that thrombospondin has a disulfide bond that is unstable in the absence of Ca2+. It can be attacked by a thiol of another molecule of thrombospondin to form disulflde-linked multimers, by a thiol of the same molecule of thrombospondin to generate isomerization of disulfide bonds or, as observed in this study, by another secreted thiol compound to give a mixed disulfide and a new thiol." @default.
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- W2057703032 date "1991-05-01" @default.
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- W2057703032 title "Reduction of a disulfide bond of thrombospondin in the supernatant solution of activated platelets" @default.
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- W2057703032 doi "https://doi.org/10.1016/0003-9861(91)90077-v" @default.
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