RGD Reference Report - Novel SCAMPs lacking NPF repeats: ubiquitous and synaptic vesicle-specific forms implicate SCAMPs in multiple membrane-trafficking functions. - Rat Genome Database

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Novel SCAMPs lacking NPF repeats: ubiquitous and synaptic vesicle-specific forms implicate SCAMPs in multiple membrane-trafficking functions.

Authors: Fernandez-Chacon, R  Sudhof, TC 
Citation: Fernandez-Chacon R and Sudhof TC, J Neurosci 2000 Nov 1;20(21):7941-50.
RGD ID: 68303
Pubmed: PMID:11050114   (View Abstract at PubMed)
PMCID: PMC6772721   (View Article at PubMed Central)

In vertebrates, secretory carrier membrane proteins (SCAMPs) 1-3 constitute a family of putative membrane-trafficking proteins composed of cytoplasmic N-terminal sequences with NPF repeats, four central transmembrane regions (TMRs), and a cytoplasmic tail. SCAMPs probably function in endocytosis by recruiting EH-domain proteins to the N-terminal NPF repeats but may have additional functions mediated by their other sequences. We now demonstrate that SCAMPs form a much larger and more heterogeneous protein family than envisioned previously, with an evolutionary conservation extending to invertebrates and plants. Two novel vertebrate SCAMPs (SCAMPs 4 and 5), single SCAMP genes in Caenorhabditis elegans and Drosophila melanogaster, and multiple SCAMPs in Arabidopsis thaliana were identified. Interestingly, the novel SCAMPs 4 and 5 lack the N-terminal NPF repeats that are highly conserved in all other SCAMPs. RNA and Western blotting experiments showed that SCAMPs 1-4 are ubiquitously coexpressed, whereas SCAMP 5 is only detectable in brain where it is expressed late in development coincident with the elaboration of mature synapses. Immunocytochemistry revealed that SCAMP 5 exhibits a synaptic localization, and subcellular fractionations demonstrated that SCAMP 5 is highly enriched in synaptic vesicles. Our studies characterize SCAMPs as a heterogeneous family of putative trafficking proteins composed of three isoforms that are primarily synthesized outside of neurons (SCAMPs 2-4), one isoform that is ubiquitously expressed but highly concentrated on synaptic vesicles (SCAMP 1), and one brain-specific isoform primarily localized to synaptic vesicles (SCAMP 5). The conservation of the TMRs in all SCAMPs with the variable presence of N-terminal NPF repeats suggests that in addition to the role of some SCAMPs in endocytosis mediated by their NPF repeats, all SCAMPs perform a "core" function in membrane traffic mediated by their TMRs.




Biological Process

  
Object Symbol
Species
Term
Qualifier
Evidence
With
Notes
Source
Original Reference(s)
Scamp2Ratendocytosis  TAS  RGD 
Scamp2Ratintracellular protein transport  TAS  RGD 

Cellular Component

  
Object Symbol
Species
Term
Qualifier
Evidence
With
Notes
Source
Original Reference(s)
Scamp5Ratsynaptic vesicle  IDA  RGD 
Scamp1Ratsynaptic vesicle membrane is_active_inIDA PMID:11050114SynGO 
Scamp1Ratsynaptic vesicle membrane is_active_inIEP PMID:11050114SynGO 
Scamp5Ratsynaptic vesicle membrane is_active_inIDA PMID:11050114SynGO 
Scamp5Ratsynaptic vesicle membrane is_active_inIEP PMID:11050114SynGO 


Genes (Rattus norvegicus)
Scamp1  (secretory carrier membrane protein 1) Scamp2  (secretory carrier membrane protein 2) Scamp5  (secretory carrier membrane protein 5)

Gene Scamp2 secretory carrier membrane protein 2 Mus musculus
Gene Scamp3 secretory carrier membrane protein 3 Mus musculus
Gene Scamp4 secretory carrier membrane protein 4 Mus musculus
Gene Scamp5 secretory carrier membrane protein 5 Mus musculus
Gene Scamp3 secretory carrier membrane protein 3 Rattus norvegicus