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Tissue distribution of SNAP-23 and its subcellular localization in 3T3-L1 cells
P P Wong1, N Daneman, A Volchuk
1Division of Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada.
Biochemical and Biophysical Research Communications
|January 3, 1997
Summary
SNAP-23, a protein involved in vesicle transport, is widely expressed in various tissues and cell types, primarily on cell membranes. This suggests a role for the SNARE complex in vesicular traffic beyond the nervous system.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- The SNARE hypothesis describes protein complexes mediating vesicular traffic.
- SNAP-25 is a key component of this complex in the nervous system.
- SNAP-23 is a related protein found in non-neuronal cells.
Purpose of the Study:
- To generate isoform-specific antibodies for SNAP-23.
- To detect the expression and localization of endogenous SNAP-23.
- To investigate SNAP-23's role in vesicular traffic.
Main Methods:
- Antibody generation against SNAP-23.
- Western blotting and immunohistochemistry for protein detection.
- Subcellular fractionation to determine protein localization.
Main Results:
- SNAP-23 is expressed in liver, lung, kidney, spleen, muscle, and heart, but not significantly in brain.
- Abundant SNAP-23 found in fibroblast, muscle, and fat cell lines.
- SNAP-23 is membrane-bound, predominantly associated with plasma membranes, and not found in the cytosolic fraction.
- SNAP-23 levels remain stable during 3T3-L1 fibroblast differentiation into adipocytes.
Conclusions:
- A tripartite SNARE complex exists outside the nervous system.
- SNAP-23 is a widely distributed protein involved in vesicular transport.
- This study supports SNAP-23's role in vesicle traffic across diverse cell types.