Regulation and specificity of membrane trafficking are required to maintain organelle integrity while performing essential cellular transport. Membrane fusion events in all eukaryotic cells are facilitated by the formation of specific SNARE (soluble N-ethylmaleimide-sensitive fusion protein-attachment protein receptor) complexes between proteins on opposing lipid bilayers. Although regulation of SNARE complex assembly is not well understood, it is clear that two conserved protein families, the Sx (syntaxin) and the SM (Sec1p/Munc18) proteins, are central to this process. Sxs are a subfamily of SNARE proteins; in addition to the coiled-coil SNARE motif, Sxs possess an N-terminal, autonomously folded, triple-helical (Habc) domain. For some Sxs, it has been demonstrated that this Habc domain exerts an autoinhibitory effect on SNARE complex assembly by making intramolecular contacts with the SNARE motif. SM proteins regulate membrane fusion through interactions with their cognate Sxs. One hypothesis for SM protein function is that they facilitate a switch of the Sx from a closed to an open conformation, thus lifting the inhibitory action of the Habc domain and freeing the SNARE motif to participate in SNARE complexes. However, whether these regulatory mechanisms are conserved throughout the Sx/SM protein families remains contentious as it is not clear whether the closed conformation represents a universal feature of Sxs.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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