The Journal of Membrane Biology

, Volume 115, Issue 1, pp 83–93 | Cite as

Reassociation of cortical secretory vesicles with sea urchin egg plasma membrane: Assessment of binding specificity

  • Robert C. Jackson
  • Paul A. Modern
Articles

Summary

An assay has been developed for quantitating the reassociation of cortical secretory vesicles (CVs) with fragments of sea urchin egg plasma membrane attached to glass slides (PM lawns). Binding ofS. pupuratus CVs to homologous PM lawns increased with time and CV concentration. The observation that CV binding was blocked by chymotrypsin digestion of the PM fragments suggested that a PM protein(s) is required for reassociation. The possibility that the extent of CV lysis that occurred during CV preparation (15.4±3.8% as assessed by ovoperoxidase assay) influenced reassociation was investigated by determining the effect of CV content proteins (isolated as fertilization product) on binding. Various concentrations of fertilization product (up to equivalent amounts of fertilization product and CV protein) had no effect on CV binding. The specificity of binding was investigated by assessing the ability of CVs to bind to PM lawns prepared from human red blood cells, and by determining the ability of heterologous vesicles to bind to egg PM fragments. PM lawns from HRBCs did not support CV binding; however, PM lawns prepared from the eggs of several species of sea urchin did bindS. pupuratus CVs. Vesicles from a partially purified preparation of yolk platelets bound to egg PM lawns with low efficiency (1/7 that of CVs), but immunofluorescence analysis with an anti-hyalin monoclonal antibody demonstrated that 74±9% of the bound vesicles were CVs that contaminated the yolk platelet preparation. Dioleoylphosphatidyl choline liposomes were also unable to bind to egg PM lawns. These results are consistent with hypothesis that CV binding to egg PM lawns is a specific, protein-mediated event.

Key Words

sea urchin egg exocytosis plasma membrane secretory vesicles 

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Copyright information

© Springer-Verlag New York Inc 1990

Authors and Affiliations

  • Robert C. Jackson
    • 1
  • Paul A. Modern
    • 1
  1. 1.Department of BiochemistryDartmouth Medical SchoolHanover

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