Dec 10, 1984

A peptide associated with eggs causes a mobility shift in a major plasma membrane protein of spermatozoa

The Journal of Biological Chemistry
N SuzukiD L Garbers


A peptide (resact) associated with the eggs of the sea urchin, Arbacia punctulata, which stimulates sperm respiration rates by 5-10-fold, was purified and its amino acid sequence was determined. The sequence was found to be Cys-Val-Thr-Gly-Ala-Pro-Gly-Cys-Val-Gly-Gly-Gly-Arg-Leu-NH2. The peptide was subsequently synthesized by solid phase methods, amidated at the carboxyl-terminal Leu, and shown to be identical to the isolated, native material. The peptide half-maximally stimulated A. punctulata spermatozoan respiration at 0.5 nM and half-maximally elevated cyclic GMP concentrations at 25 nM at an extracellular pH of 6.6. The increase in oxygen consumption was coupled with a stimulation of motility. However, at elevated extracellular pH (pH 8.0), resact failed to appreciably stimulate respiration while the elevations of cyclic GMP continued to occur. Resact did not cross-react with sperm cells obtained from Lytechinus pictus or Strongylocentrotus purpuratus; a peptide (speract) obtained from S. purpuratus eggs (Gly-Phe-Asp-Leu-Asn-Gly-Gly-Gly-Val-Gly) which activates S. purpuratus sperm respiration did not stimulate A. punctulata spermatozoa. Resact caused a shift in the apparent molecular weight (160,000-150,000) of a major sp...Continue Reading

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Mentioned in this Paper

Cell Motility
Aethalura punctulata
Cyclic GMP Measurement (Lab Test)
Arbacia punctulata
Cell Respiration

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