Abstract
Two highly basic proteins which appear during cuttlefish spermiogenesis have been isolated from testis chromatin and from sperm nuclei. (1) Protein T is a spermatid-specific protein which is transiently associated to DNA and disappears in spermatozoa. It is rich in arginine (approx. 60%) and is phosphorylated at different levels. (2) Protein Sp is a typical protamine which appears in the late stage of spermiogenesis and constitutes the major basic nuclear component in mature spermatozoa. It is very rich in arginine (approx. 77%) and contains only four different amino acids. Phosphorylated in the testis, it is completely dephosphorylated in the spermatozoa. It is suggested that protein T could be a precursor of protein Sp.
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Schedule a callMore From: Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology
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