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- W2159438500 abstract "In this study we used previously characterized monoclonal antibodies to acrosin (ACR.2) and to an acrosomal matrix antigen (ACR.4) to analyze the acrosin-binding activity of a 28-kDa putative acrosin-binding protein from the acrosomal matrix. The 28-kDa protein bound proacrosin and the 49-kDa form of acrosin (α-acrosin) but it did not bind the 36-kDa acrosin form (β-acrosin). The acrosin-binding activity of the 28-kDa protein was stimulated by Ca2+, inhibited by Mg2+, and removed by disulphide bond reduction. Induction of the acrosome reaction by a calcium ionophore resulted in proteolytic cleavage of the 28-kDa protein, giving rise to a 12-kDa degradation product that was the only form of ACR.4 antigen released to incubation media; the release of the ACR.4 antigen was closely correlated with that of acrosin. The release of α-acrosin to incubation media was accelerated in the presence of ACR.4 antibody. In a cell-free system, a limited cleavage of the purified 28-kDa protein into immunoreactive degradation products was catalyzed by acrosin but not by trypsin or chymotrypsin. The data suggest that the 28-kDa acrosomal protein helps to maintain acrosomal matrix integrity and controls the acrosin release from acrosome-reacted cells." @default.
- W2159438500 created "2016-06-24" @default.
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- W2159438500 date "1993-08-01" @default.
- W2159438500 modified "2023-10-18" @default.
- W2159438500 title "Protein—Protein Interactions Controlling Acrosin Release and Solubilization during the Boar Sperm Acrosome Reaction" @default.
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- W2159438500 doi "https://doi.org/10.1095/biolreprod49.2.408" @default.
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