Syntaxin-1A is a member of the syntaxin superfamily. Syntaxins are nervous system-specific proteins implicated in the docking of synaptic vesicles with the presynaptic plasma membrane. Syntaxins possess a single C-terminal transmembrane domain, a SNARE [Soluble NSF (N-ethylmaleimide-sensitive fusion protein)-Attachment protein REceptor] domain (known as H3), and an N-terminal regulatory domain (Habc). Syntaxins bind synaptotagmin in a calcium-dependent fashion and interact with voltage dependent calcium and potassium channels via the C-terminal H3 domain. Syntaxin-1A is a key protein in ion channel regulation and synaptic exocytosis.
Background References
1. Petro CD. et. al. Shiga Toxin Type 1a (Stx1a) Reduces the Toxicity of the More Potent Stx2a In Vivo and In Vitro. Infect Immun. 2019 Mar.
2. Wang M. et. al. STX1A gene variations contribute to the susceptibility of children attention-deficit/hyperactivity disorder: a case-control association study.Eur Arch Psychiatry Clin Neurosci. 2019 Sep.
Sequence Similarity
Belongs to the syntaxin family.
Tissue Specificity
Isoform 1 is highly expressed in embryonic spinal chord and ganglia and in adult cerebellum and cerebral cortex. Isoform 2 is expressed in heart, liver, fat, skeletal muscle, kidney and brain.
Post-translational Modification
Phosphorylated by CK2 (By similarity). Phosphorylation at Ser-188 by DAPK1 significantly decreases its interaction with STXBP1.; Sumoylated, sumoylation is required for regulation of synaptic vesicle endocytosis.
Wash buffer: 1× TBST Endogenous peroxidase blocking: 3% H₂O₂, 10 minutes at room temperature. Blocking: 1% BSA + 10% normal goat serum, 10 minutes at room temperature. Primary antibody: ET7110-68, 1/2,000, 1 hour at room temperature. Secondary antibody: HA1119, 20 minutes at room temperature. Negative expression of Syntaxin 1a protein in heart is consistent with the predicted expression pattern.
Western blot analysis of Syntaxin 1a on different lysates with Rabbit anti-Syntaxin 1a antibody (ET7110-68) at 1/1,000 dilution.
Lane 1: Rat cerebellum tissue lysate Lane 2: Mouse cerebellum tissue lysate
Exposure time: 30 seconds; ECL: K1801
Blocking: 5% NFDM/TBST, 1 hour at room temperature Primary antibody: ET7110-68, 1/1,000 2 hour at room temperature Secondary antibody: Goat anti-Rabbit IgG-HRP (HA1001), 1/50,000 in 5% NFDM/TBST, 1 hour at room temperature
Predicted band size: 33.0 kDa Observed band size: 37 kDa
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