Reconstitution of Calcium-triggered Membrane Fusion Using “Reserve” Granules*

Calcium-gated secretion of proteins involves the transfer of “reserve” granules, exocytotic vesicles that are cytoplasmic and, hence, plasma membrane-naive, from the cell interior to the surface membrane where they dock prior to fusion. Docking and subsequent priming steps are thought to require cytoplasmic factors. These steps are believed to induce fusion competence. We have tested this hypothesis by isolating reserve granules from sea urchin eggs and determining under which conditions these granules will fuse. We find that isolated reserve granules, lacking soluble cofactors, support calcium-dependent membrane fusion in vitro. Preincubation with adenosine 5′-3-O-(thio)triphosphate and guanosine 5′-3-O-(thio)triphosphate did not prevent fusion. Thus, isolated reserve granules have all the necessary components required for calcium-gated fusion prior to docking.

• Publication year

  1998

• Venue

  Journal of Biological Chemistry

• Publication date

  1998-01-23

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1074/jbc.273.4.2445PMID 9442095
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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