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J Biol Chem, Vol. 273, Issue 35, 22217-22223, August 28, 1998
From the Department of Molecular Biology, Holland Laboratory,
American Red Cross, Rockville, Maryland 20855 and the
§ Center for Molecular Medicine, Maine Medical Center
Research Institute, South Portland, Maine 04106
By using p65 synaptotagmin-1 and fibroblast
growth factor (FGF)-1:
Synaptotagmin-1 Is Required for Fibroblast Growth Factor-1
Release
-galactosidase (
-gal) NIH 3T3 cell
co-transfectants, we demonstrate that a proteolytic fragment consisting
of the extravesicular domain of synaptotagmin-1 is released into the
extracellular compartment in response to temperature stress with
similar kinetics and pharmacological properties as FGF-1:
-gal. Using
a deletion mutant that lacks 95 amino acids from the extravesicular
domain of synaptotagmin-1, neither synaptotagmin-1 nor FGF-1:
-gal
are able to access the stress-induced release pathway. Furthermore, the
p40 extravesicular fragment of synaptotagmin-1 is constitutively
released in p40 synaptotagmin-1 NIH 3T3 cell transfectants, and this
release is potentiated when the cells are subjected to temperature
stress. These data demonstrate that the p40 fragment derived from
synaptotagmin-1 is able to utilize the FGF-1 non-classical exocytotic
pathway and that the release of FGF-1 is dependent on
synaptotagmin-1.
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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