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- W2167646111 abstract "Highly purified plasma membranes, isolated by an aqueous two-phase polymer method from goat epididymal spermatozoa, were found to possess a kinase activity that causes phosphorylation of serine and threonine residues of several endogenous plasma membrane proteins. Cyclic AMP, cyclic GMP, Ca(2+)-calmodulin, phosphatidylserine-diolein, polyamines and heparin had no appreciable effect on this kinase. Autoradiographic analysis showed that the profile of the phosphorylation of membrane proteins by this endogenous cAMP-independent protein kinase underwent marked modulation during the transit of spermatozoa through the epididymis. In caput sperm plasma membrane, 18, 21, 43, 52, 74 and 90 kDa proteins were phosphorylated, whereas, in the corpus and cauda epididymal spermatozoa, a differential phosphorylation pattern was observed with respect to the 90, 74, 21 and 18 kDa proteins. The rate of phosphorylation of the 74 kDa protein decreased markedly during the early phase of sperm maturation (caput to distal corpus epididymides) whereas there was little change in kinase activity in sperm plasma membrane. In contrast, the rates of phosphorylation of the 18 and 21 kDa proteins increased during the terminal phase (distal corpus to distal cauda epididymides) of sperm maturity, although the kinase activity of membrane decreased significantly during this phase. The modulation of the phosphorylated states of these specific membrane proteins may play an important role in the maturation of epididymal spermatozoa." @default.
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- W2167646111 date "1999-01-01" @default.
- W2167646111 modified "2023-10-10" @default.
- W2167646111 title "Maturation-dependent modification of the protein phosphorylation profile of isolated goat sperm plasma membrane" @default.
- W2167646111 doi "https://doi.org/10.1530/jrf.0.1150029" @default.
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