Biol Reprod 2009 SSR Annual Meeting Abstracts
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Biology of Reproduction, Vol 46, 366-378, Copyright © 1992 by Society for the Study of Reproduction

ARTICLES

Characterization of rabbit testis beta-galactosidase and arylsulfatase A: purification and localization in spermatozoa during the acrosome reaction

BS Nikolajczyk and MG O'Rand
Department of Cell Biology and Anatomy, University of North Carolina, Chapel Hill 27599.

Examination of the role of carbohydrates in specific recognition between spermatozoa and zona pellucida has focussed on understanding the interaction of sperm hydrolases or lectin-like molecules with zona pellucida ligands. To elucidate the role of specific spermatozoan hydrolases in gamete interaction, rabbit testis beta-galactosidase and arylsulfatase A were purified, characterized, and localized in spermatozoa. beta-Galactosidase and arylsulfatase A co-purified after affinity, size, or reverse-phase chromatography. N-Terminal amino acid analysis and enzymatic characterization suggested that neither enzyme is a testis-specific isozyme. Size chromatography indicated that both enzymes aggregated into macromolecular complexes at pH 4.0, while both dissociated at pH 8.0. beta-Galactosidase and arylsulfatase A co- localized on the sperm surface and in the acrosome and postacrosomal regions of spermatozoa. Throughout the zona-induced acrosome reaction, both enzymes remained associated with the detached acrosomal cap and postacrosomal region of acrosome-reacted spermatozoa. Because the acrosome is an acidic subcellular compartment, internal beta- galactosidase and arylsulfatase A are probably aggregated in acrosome- intact spermatozoa and dissociate as they are exposed to pH increases during the acrosome reaction.


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