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Structural function of the basic nuclear proteins in ram spermatids.

M Loir, M Lanneau

Journal of Ultrastructure Research

|March 1, 1984

Summary

Ram sperm chromatin packaging relies on proteins and disulfide bonds. Initially, noncovalent interactions are key, but disulfide bonds in spermatidal proteins and protamine progressively stabilize sperm chromatin during maturation.

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Area of Science:

Reproductive Biology
Molecular Biology
Biochemistry

Background:

Spermiogenesis involves extensive chromatin remodeling for sperm function.
Cysteine-rich spermatidal proteins and protamine are crucial for this process.
Understanding their roles in chromatin packaging and stabilization is vital.

Purpose of the Study:

To investigate the function of cysteine-containing spermatidal proteins and protamine.
To elucidate their roles in chromatin packaging and stabilization during ram spermiogenesis.

Main Methods:

Investigated nuclear stability via sonication resistance after protein extraction.
Analyzed chromatin decondensation and ultrastructure using electron microscopy.
Examined the effect of dithiothreitol on disulfide bond reduction and chromatin structure.

Main Results:

Extraction of histones and spermatidal proteins decreased nuclear stability and decondensed chromatin.
Protamine-containing chromatin remained stable after acid, salt, or heparin extraction.
Dithiothreitol treatment decondensed nuclei, revealing 35-A filaments, with stabilization increasing with maturation.
Disulfide bonding progressively stabilized chromatin, becoming primary in protamine-containing nuclei.

Conclusions:

Noncovalent interactions are important early in chromatin reorganization.
Disulfide bonds between spermatidal proteins and protamine progressively stabilize sperm chromatin.
This progressive disulfide bonding is essential for mature sperm chromatin structure and stability.

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