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  • Title: [Basic nuclear proteins of transition during spermiogenesis in Scylliorhinus caniculus].
    Author: Chauvière M, Martinage A, Sautière P, Chevaillier P.
    Journal: Reprod Nutr Dev; 1990; 30(3):349-54. PubMed ID: 2397031.
    Abstract:
    During dog-fish spermiogenesis, 2 basic nuclear protein transitions occur: the first from histones to spermatid-specific proteins S1 and S2, the second leading to protamines. S1, the most abundant transition protein, is a polypeptide containing 87 residues (Mr = 11,179 Da) whereas S2, the minor transition protein, contains 80 residues (Mr = 9,726 Da). The 2 proteins are mainly characterized by an asymmetry of the molecule, a very high content of basic residues, a relatively high level of hydrophobic residues and a cluster of acidic residues in the carboxy-terminal quarter of the molecule. The 2 proteins are phosphorylated on serine residues and the degree of phosphorylation is relatively important in protein S1. The 2 transition proteins are structurally unrelated to testis histones or sperm protamines and cannot be considered either as their proteolytic degradation products or as their precursors.
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