Title : Self-association of synexin in the presence of calcium. Correlation with synexin-induced membrane fusion and examination of the structure of synexin aggregates.

Pub. Date : 1979 Jan 25

PMID : 762079






4 Functional Relationships(s)
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1 253, 2858-2866) that synexin, an adrenal medullary protein that causes Ca2+-dependent aggregation of isolated chromaffin granules, might be the intracellular receptor for Ca2+ in the process of exocytosis. chromaffin annexin A7 Homo sapiens
2 The curve has a Hill coefficient of 2.3 and is half-maximal at 200 micron Ca2+, which correlates exactly with the Ca2+ titration curve for the aggregation of chromaffin granules by synexin. chromaffin annexin A7 Homo sapiens
3 We suggest that synexin exists as a soluble monomer in the cytoplasm of the resting chromaffin cell and that when the cell is stimulated to secrete, the increase in the intracellular concentrations of Ca2+ causes synexin to form rods, similar to those formed in vitro, which bind to chromaffin granule and plasma membranes, joining them together to form the "pentalaminar" fusion complexes characteristic of the first step in exocytosis. chromaffin annexin A7 Homo sapiens
4 We suggest that synexin exists as a soluble monomer in the cytoplasm of the resting chromaffin cell and that when the cell is stimulated to secrete, the increase in the intracellular concentrations of Ca2+ causes synexin to form rods, similar to those formed in vitro, which bind to chromaffin granule and plasma membranes, joining them together to form the "pentalaminar" fusion complexes characteristic of the first step in exocytosis. chromaffin annexin A7 Homo sapiens