Localization of Zinc in a Dense Fiber-Connecting Piece Fraction of Rat Sperm Tails Chemically Analogous to Hair Keratin

    September 1975 in “ Biology of Reproduction ”
    Harold I. Calvin, Frances H.-F. Hwang, Herma Wohlrab
    TLDR Most zinc in rat sperm is in the tail, linked to structures similar to hair keratin.
    The study examined the distribution of zinc in mature rat sperm, finding that over 90% of zinc was located in the tail, primarily in -S-S-crosslinked structures resistant to disintegration in SDS. Zinc was associated with -SH groups, and its concentration decreased in both the heads and tails during epididymal passage. In the sperm head, a minor fraction of zinc was also linked to -S-S-bonded structures. In isolated tails, over 75% of zinc was retained in a subfraction mainly composed of dense fibers. The protein mixture from these structures had a similar amino acid composition to wool and guinea pig hair, suggesting a possible common phylogenetic origin and similar zinc interactions during assembly.
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