title: Identification of a novel SNAP25 interacting protein (SIP30).
abstract: Soluble N -ethylmaleimide-sensitive factor attachment protein receptors (SNAREs), including synaptosome-associated proteins of 25 kDa (SNAP25), syntaxins, and vesicle-associated membrane proteins (VAMP), are essential for regulated exocytosis of synaptic vesicles in neurotransmission. We identified a cDNA coding for a novel protein of 266 amino acids that we have named SIP30 (S NAP25 interacting protein of 30 kDa). SIP30 is expressed abundantly in brain and slightly in testis and kidney. In brain, SIP30 is highly expressed in the inferior and superior colliculi, which contain important relay nuclei of the auditory and visual systems. GST-pull-down and immunoprecipitation assays showed direct binding of SIP30 to SNAP25. Although SIP30 does not directly interact with syntaxin based on pull-down assays, syntaxin does co-immunoprecipitate with SIP30 suggesting that syntaxin is indirectly associated with SIP30, perhaps through SNAP25.
authors.affiliation: Laboratory of Neurochemistry, NIDCD, National Institutes of Health, Bethesda, Maryland 20892, USA.
authors.forename: Ho-Ki
authors.initials: HK
authors.lastname: Lee
authors.forename: Saaid
authors.initials: S
authors.lastname: Safieddine
authors.forename: Ronald S
authors.initials: RS
authors.lastname: Petralia
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Wenthold
mesh_terms: D000595:Amino Acid Sequence / Q000235:genetics; D000818:Animals; D001483:Base Sequence / Q000235:genetics; D001921:Brain / Q000378:metabolism; D002352:Carrier Proteins / Q000235:genetics* / Q000378:metabolism*; D002460:Cell Line; D002868:Chromosomal Proteins, Non-Histone; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D006168:Guinea Pigs; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008565:Membrane Proteins / Q000502:physiology; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins / Q000235:genetics* / Q000378:metabolism* / Q000502:physiology*; D009925:Organ of Corti / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D050825:Synaptosomal-Associated Protein 25; D014018:Tissue Distribution
chemical_list: D002352:Carrier Proteins; D002868:Chromosomal Proteins, Non-Histone; D018076:DNA, Complementary; D008565:Membrane Proteins; D009419:Nerve Tissue Proteins; C494208:SNAP25 protein, human; C494210:Snap25 protein, rat; D050825:Synaptosomal-Associated Protein 25; C459407:Zwint protein, rat