What question did this study set out to answer?

To delineate the structural properties, activation mechanism, and functional role of acrosomal proteins, particularly acrosin, during sperm-egg penetration.

April 27, 2009Andrologia

Cell biology of acrosomal proteins: Zellbiologie akrosomaler Proteine

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Authors

ETEdda Töpfer‐PetersenUniversity of Veterinary Medicine Hannover, Foundation DČD. ČechováCharles University AHAgnes HenschenMax Planck Institute for Developmental Biology

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Implication

Mechanistic review uncovers proacrosin activation and zona pellucida binding in spermatozoa, indicating a cyclic digestion process essential for egg penetration.

Key Points

To delineate the structural properties, activation mechanism, and functional role of acrosomal proteins, particularly acrosin, during sperm-egg penetration.
Characterized the molecular domains of acrosin, focusing on the proteinase catalytic triad, membrane-associating hydrophobic domains, and carbohydrate-binding regions.
Evaluated the proteolytic conversion of the inactive 53–55 kDa proacrosin precursor into the active high-molecular-mass enzyme.
Proacrosin exists as an inactive 53–55 kDa precursor that is activated via a single proteolytic cleavage between Arg23 and Val24 to produce functional acrosin.
Activation occurs concurrently with the acrosome reaction and is regulated on and by the zona pellucida.
Zona penetration is proposed to require repetitive cycles of sperm binding, enzymatic digestion, and release coordinated with forward motility.

Cite This Study

Töpfer‐Petersen et al. (2009) studied this question.

synapsesocial.com/papers/6a93bb9a40aff459acebc99e https://doi.org/10.1111/j.1439-0272.1990.tb02077.x

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Implication

Mechanistic review uncovers proacrosin activation and zona pellucida binding in spermatozoa, indicating a cyclic digestion process essential for egg penetration.

Cell biology of acrosomal proteins: Zellbiologie akrosomaler Proteine

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Member takes

Implication

Key Points

Cite This Study

Cell biology of acrosomal proteins: Zellbiologie akrosomaler Proteine

Discussion

Member takes

Implication

Key Points

Cite This Study

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