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Related Experiment Videos

Angiotensin converting enzyme from capacitated rabbit spermatozoa: two distinct forms.

U S Singh1, A K Srivastava

  • 1Division of Biochemistry and Food Science, Indian Veterinary Research Institute, Izatnagar.

Andrologia
|July 1, 1988
PubMed
Summary

Rabbit sperm contain high concentrations of angiotensin converting enzyme (ACE). This enzyme is released during in vitro capacitation, with two forms identified: a high molecular weight, low activity form and a low molecular weight, high activity form.

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Area of Science:

  • Reproductive Biology
  • Enzymology

Background:

  • Angiotensin converting enzyme (ACE) is found in high concentrations within rabbit sperm cells.
  • Spermatozoa undergo capacitation, a process essential for fertilization.

Purpose of the Study:

  • To investigate the release and forms of ACE during in vitro sperm capacitation.
  • To characterize the enzymatic activity of different ACE forms.

Main Methods:

  • In vitro capacitation of rabbit spermatozoa.
  • Purification of ACE from the minimum capacitation medium.
  • Analysis of enzyme activity and molecular weight of purified ACE forms.

Main Results:

  • ACE is released from spermatozoa during in vitro capacitation.

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  • Two distinct forms of ACE were purified: one with higher molecular weight and low activity, and another with lower molecular weight and higher activity.
  • Evidence suggests a conversion from the higher to the lower molecular weight form during capacitation.

    • Conclusions:

    • Spermatozoa release ACE during in vitro capacitation.
    • ACE exists in at least two forms with differing enzymatic activities.
    • A molecular transformation of ACE may occur during sperm capacitation, potentially influencing sperm function.