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Calmodulin-binding proteins in bovine semen

P Manjunath1, L Chandonnet, L Baillargeon

  • 1Department of Medicine, University of Montreal, Quebec, Canada.

Journal of Reproduction and Fertility
|January 1, 1993
PubMed
Summary

Bovine seminal plasma proteins bind calmodulin, influencing sperm function. This interaction, particularly with BSP proteins, suggests a role in sperm capacitation and acrosome reaction, crucial for fertility.

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Area of Science:

  • Reproductive Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Calmodulin is a key calcium-binding protein regulating cellular processes.
  • Bovine seminal plasma (BSP) proteins are implicated in sperm function and fertility.
  • Calcium ions (Ca2+) play a critical role in sperm capacitation and the acrosome reaction.

Purpose of the Study:

  • To identify and characterize calmodulin-binding proteins in bovine spermatozoa and seminal plasma.
  • To investigate the interaction between bovine seminal plasma (BSP) proteins and calmodulin.
  • To explore the potential role of BSP proteins and their interaction with calmodulin in sperm capacitation and the acrosome reaction.

Main Methods:

  • 125I-labelled calmodulin gel overlay assay to detect calmodulin-binding proteins.
  • Analysis of calmodulin-binding proteins in epididymal and ejaculated spermatozoa.
  • Investigation of calmodulin binding to purified BSP proteins (BSP-A1, BSP-A2, BSP-A3, BSP-30 kDa) in the presence and absence of Ca2+.
  • Limited proteolysis of BSP proteins followed by calmodulin-binding analysis.

Main Results:

  • Several calmodulin-binding proteins (12 to >200 kDa) were identified in bovine spermatozoa.
  • In seminal plasma, specific proteins (15, 16 kDa) showed Ca2+-dependent binding, while others (6-17 kDa) bound more calmodulin without Ca2+.
  • Purified BSP proteins (BSP-A1, -A2, -A3, BSP-30 kDa) bound calmodulin irrespective of Ca2+ presence.
  • Tryptic peptides of BSP proteins exhibited enhanced calmodulin-binding activity, particularly in the absence of calcium.

Conclusions:

  • BSP proteins interact with calmodulin in a manner influenced by calcium.
  • Low molecular mass BSP-related polypeptides in seminal plasma exhibit significant calmodulin-binding activity.
  • BSP proteins are suggested to be involved in sperm capacitation and the acrosome reaction, potentially mediated by calmodulin interactions.

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