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SCAMP 37, a new marker within the general cell surface recycling system
1Department of Anatomy and Cell Biology, University of Virginia Health Sciences Center, Charlottesville 22908.
The EMBO Journal
|October 1, 1993
Summary
Secretory carrier membrane proteins (SCAMPs) are key components in recycling cell surface receptors. Their broad distribution suggests SCAMPs are fundamental markers for cell surface recycling pathways.
Area of Science:
- Cell Biology
- Molecular Biology
- Membrane Trafficking
Background:
- Secretory carrier membrane proteins (SCAMPs) are found in post-Golgi membranes.
- SCAMPs are involved in recycling carriers to the cell surface.
- SCAMPs are present in various cell types, including fibroblasts and neurons.
Purpose of the Study:
- To investigate the distribution and function of SCAMPs in different cellular pathways.
- To analyze the primary sequence and structural motifs of SCAMP 37.
- To determine the role of SCAMPs in cell surface recycling.
Main Methods:
- Subcellular localization studies in fibroblasts and neurons.
- Analysis of SCAMP distribution in endocytosis, recycling, and regulated transport pathways.
- Primary sequence analysis of SCAMP 37, identifying structural motifs.
Main Results:
- SCAMPs are concentrated in compartments for endocytosis and recycling of cell surface receptors.
- In neurons, SCAMPs are components of regulated carriers like synaptic vesicles and secretion granules.
- SCAMP 37 sequence reveals a novel polypeptide with calcium binding domain, leucine zipper, and zinc fingers.
- SCAMPs are broadly distributed across tissues and localize within specific recycling pathways.
Conclusions:
- SCAMPs are general markers for membranes involved in cell surface recycling.
- The structural features of SCAMPs suggest a fundamental role in membrane trafficking.
- SCAMPs play a crucial role in diverse cellular transport pathways, particularly in cell surface recycling.