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Characterization of low Mr zona pellucida binding proteins from boar spermatozoa and seminal plasma
R V Parry1, P J Barker, R Jones
1AFRC Institute of Animal Physiology & Genetics Research, Babraham, Cambridge, England.
Abstract:
A group of low Mr (16 kDa-23 kDa) glycoproteins on ejaculated boar spermatozoa have been shown to have high affinity for homologous zona pellucida glycoproteins (ZPGPs). These ZPGP binding proteins are derived from seminal plasma as shown by their absence from epididymal spermatozoa and their presence in seminal plasma as identified by N-terminal amino acid sequence analysis. They bind to ZPGPs by a polysulphate recognition mechanism similar to that found for proacrosin-ZPGP interactions. The haemagglutination activity of boar seminal plasma is also associated with these low Mr glycoproteins. It is suggested that they play a role in regulating the rate of sperm capacitation and survival in the female reproductive tract.
Insights
Low molecular weight glycoproteins from boar seminal plasma bind to zona pellucida glycoproteins (ZPGPs). These proteins, crucial for sperm-egg interaction, may regulate sperm capacitation and survival.
Area of Science:
- Reproductive biology
- Glycobiology
- Sperm-zona pellucida interactions
Background:
- Ejaculated boar spermatozoa possess low molecular weight (16-23 kDa) glycoproteins.
- These glycoproteins exhibit high affinity for homologous zona pellucida glycoproteins (ZPGPs).
Purpose of the Study:
- To characterize the origin and binding mechanism of low molecular weight glycoproteins on boar spermatozoa.
- To investigate the role of these glycoproteins in sperm-egg interactions and reproductive function.
Main Methods:
- Analysis of boar spermatozoa and seminal plasma.
- N-terminal amino acid sequence analysis.
- Characterization of glycoprotein binding to ZPGPs.
Main Results:
- Low molecular weight glycoproteins are derived from seminal plasma, not epididymal spermatozoa.
- These proteins bind to ZPGPs via a polysulphate recognition mechanism.
- Haemagglutination activity of boar seminal plasma is linked to these glycoproteins.
Conclusions:
- Seminal plasma glycoproteins play a significant role in boar sperm-zona pellucida binding.
- These molecules may regulate sperm capacitation and survival in the female reproductive tract.