An acrosomal protein, sp32, in mammalian sperm is a binding protein specific for two proacrosins and an acrosin intermediate

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An acrosomal protein, sp32, in mammalian sperm is a binding protein specific for two proacrosins and an acrosin intermediate.

An acrosomal protein, sp32, was completely purified from acid extracts of ejaculated porcine sperm. Purified sp32 gave a single 32-kDa protein band on SDS-polyacrylamide gel electrophoresis and was characterized as a binding protein specific for 55-, 53-, and 49-kDa forms of (pro)acrosin. This protein was not capable of binding a 43-kDa acrosin intermediate and 35-kDa mature acrosin. sp32 signi...

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Expression and tyrosine phosphorylation of sp32 regulate the activation of the boar proacrosin/acrosin system.

The current study investigated the relationship between the level of expression and tyrosine phosphorylation of the sperm protein 32 (sp32) and the activation of the boar proacrosin/acrosin system. The acrosomal membrane proteins of boar sperm for use in different treatment experiments (i.e., fresh sperm, freezing and thawing, capacitation, and acrosome reaction) were separated, stained by Coom...

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Remodeling of the plasma membrane in preparation for sperm–egg recognition: roles of acrosomal proteins

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Mature mammalian oocytes undergo a prolonged series of cytoplasmic calcium (Ca(2+)) oscillations at fertilization that are the cause of oocyte activation. The Ca(2+) oscillations in mammalian oocytes are driven via inositol 1,4,5-trisphosphate (IP3) generation. Microinjection of the sperm-derived phospholipase C-zeta (PLCζ), which generates IP3, causes the same pattern of Ca(2+) oscillations as...

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ژورنال

عنوان ژورنال: Journal of Biological Chemistry

سال: 1994

ISSN: 0021-9258

DOI: 10.1016/s0021-9258(17)37000-x