[No authors listed]
Acrosomal assembly during spermatogenesis and acrosome reaction during sperm-oocyte interaction are unique events of vesicle synthesis, transport, and fusion leading to fertilization. SNARE complex formation is essential for membrane fusion, and vesicle-associated (v-) SNARE intertwines with target membrane (t-) SNARE to form a coiled coil that bridges two membranes and facilitates fusion. We detected messages of Vam6P and SNAP in mammalian testis and epididymis. Vam6P and SNAP were detected in a temporally organized fashion on the spermatozoa from testis and epididymis, which showed accumulation on the principal acrosomal domains during capacitation. Vam6P and SNAP were shed off from the principal acrosomal domain after acrosome reaction, but the equatorial and the post-acrosomal domains retained these proteins. Antibodies to VAMP and SNAP inhibited sperm-zona pellucida interaction, suggesting their possible involvement in sperm membrane vesiculation.
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