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

FEBS Letters

Breitbart, Haim¹  Margalit, Ilana¹  Spungin, Ben¹ 

[1] Department of Life Sciences, Bar-Ilan University, Ramat Gan 52900, Israel

关键词: Sperm;    Ova;    Fertilization;    Protein trafficking;    Membrane remodelling;    Cell recognition;   

DOI  :  10.1016/0014-5793(94)01336-Y

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

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.

【 授权许可】

Unknown