A 70 kDa protein is transferred from the outer acrsomal to the plasma membrane during capacitation

Bull sperm plasma and outer acrosomal membranes were analyzed by SDS-PAGE. Analysis of the plasma membrane proteins revealed the presence of a 70 kDa band the prominence of which is enhanced after capacitation. This protein was found to bind to zona pellucida intact oocytes. PAGE analysis of outer a...

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Bibliographic Details
Published in:FEBS letters 1995-01, Vol.357 (1), p.98-102
Main Authors: Spungin, Ben, Margalit, Ilana, Breitbart, Haim
Format: Article
Language:English
Subjects:
Cell recognition
Fertilization
Membrane remodelling
Ova
Protein trafficking
Sperm
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Summary:Bull sperm plasma and outer acrosomal membranes were analyzed by SDS-PAGE. Analysis of the plasma membrane proteins revealed the presence of a 70 kDa band the prominence of which is enhanced after capacitation. This protein was found to bind to zona pellucida intact oocytes. PAGE analysis of outer acrosomal membrane proteins also reveals the presence of a 70 kDa band, but its prominence decreases after capacitation. This protein also binds to zona pellucida intact oocytes. Futhermore, the 70 kDa outer acrosomal membrane protein is recognized in Western blot analysis by antibodies to plasma membrane proteins and vice versa. The results indicate that the 70 kDa acrosomal and plasma membrane proteins are the same. This 70 kDa protein would thus be a zona pellucida binding protein which is initially stored in the outer acrosomal membrane and transferred to the plasma membrane during capacitation, enabling it to function in egg-sperm binding.
ISSN:0014-5793
1873-3468
DOI:10.1016/0014-5793(94)01336-Y