Apr 23, 1976

Subcellular localizations of guanylate cyclase and 3',5'-cyclic nucleotide phosphodiesterase in sea urchin sperm

Biochimica Et Biophysica Acta
M Sano


The subcellular localizations of guanylate cyclase and 3',5'-cyclic nucleotide phosphodiesterase in sea urchin sperm were examined. Both the specific and total activities of these two enzymes were much higher in sperm flagella (tails) than in the heads. In addition to the observation that guanylate cyclase in the flagella was particulate-bound and solubilized by Triton X-100, more than 80% of the cyclase activity in the flagella was found in the plasma membrane fraction, whereas the activity of cyclic nucleotide phosphodiesterase was observed in both the axonemal and plasma membrane fractions. The observations indicated that the cyclase in the flagella appeared to be associated with the plasma membrane. Cyclic nucleotide phosphodiesterase in the plasma membrane fraction as well as the axonemal fraction hydrolyzed both cyclic GMP and cyclic AMP; however, the rates of hydrolysis for cyclic GMP were obviously higher than those for cyclic AMP. The enzymic properties of guanylate cyclase and cyclic nucleotide phosphodiesterase in sperm flagella were also briefly described.

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Mentioned in this Paper

Enzymes, antithrombotic
Cyclic GMP Measurement (Lab Test)
Phosphoric diester hydrolase
Membrane Fraction
Cyclic AMP
Sea urchin (invertebrate)
Cyclic Adenosine Monophosphate Measurement
Enzymes for Treatment of Wounds and Ulcers
Subcellular Fractions

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