By Western blot, this antibody detects an ~67 kDa protein representing Munc-18 from rat whole brain extract.
Use at an assay dependent concentration. PubMed: 18487653
May participate in the regulation of synaptic vesicle docking and fusion, possibly through interaction with GTP-binding proteins. Essential for neurotransmission and binds syntaxin, a component of the synaptic vesicle fusion machinery probably in a 1:1 ratio. Can interact with syntaxins 1, 2, and 3 but not syntaxin 4. May play a role in determining the specificity of intracellular fusion reactions.
Brain and spinal cord. Highly enriched in axons.
Defects in STXBP1 are the cause of epileptic encephalopathy early infantile type 4 (EIEE4) [MIM:612164]. Affected individuals have neonatal or infantile onset of seizures, suppression-burst pattern on EEG, profound mental retardation, and MRI evidence of hypomyelination.
ICC/IF image of ab3451 stained PC12 cells. The cells were 4% PFA fixed (10 min) and then incubated in 1%BSA / 10% normal goat serum / 0.3M glycine in 0.1% PBS-Tween for 1h to permeabilise the cells and block non-specific protein-protein interactions. The cells were then incubated with the antibody (ab3451, 5µg/ml) overnight at +4°C. The secondary antibody (green) was Alexa Fluor® 488 anti-rabbit IgG (H+L) used at a 1/1000 dilution for 1h. Alexa Fluor® 594 WGA was used to label plasma membranes (red) at a 1/200 dilution for 1h. DAPI was used to stain the cell nuclei (blue) at a concentration of 1.43µM.
Immunohistochemistry (PFA perfusion fixed frozen sections) - Anti-Munc18-1 antibody (ab3451)Image from Wagnon JL et al., PLoS Genet 8(11): e1003067.. Fig 6.; doi: 10.1371/journal.pgen.1003067. Epub 2012 Nov 29.
Immunohistochemical analysis of PFA-perfusion fixed mouse brain tissue, staining Munc18-1 with ab3451.
Tissue was post-fixed in 4% paraformaldehyde overnight at 4°C. Sections were incubated in a blocking buffer of 0.3% Triton-X-100, 1% BSA and 10% NGS in PBS for 2 hours at room temperature, before incubating with primary antibody (1/100) for 2 days at 4°C. An AlexaFluor®-conjugated anti-rabbit IgG (1/1000) was used as the secondary antibody.
Wagnon JL et al. CELF4 regulates translation and local abundance of a vast set of mRNAs, including genes associated with regulation of synaptic function. PLoS Genet8:e1003067 (2012).
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Kim K et al. Munc18b is an essential gene in mice whose expression is limiting for secretion by airway epithelial and mast cells. Biochem J446:383-94 (2012).
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