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In the current study, we have made the unexpected observation that congenital deficiency of the STXBP2 protein may also affect the expression of STXBP1. Further analysis identified an unsuspected functional role for STXBP1 in secretory granule-mediated NK and T-cell cytotoxicity.
Loss of Munc18-2/Stxbp2 recapitulated the pathologic features observed in patients with MUNC18-2 deficiency.
Neonatal platelets exhibit low levels of the Stx11-Munc18b complex (essential component of the SNARE machinery) and of beta1-tubulin. These developmental deficiencies are associated with defects in platelet adhesion, spreading and secretion.
Among these nine polymorphisms, rs188212047 [G/T (L212F)] of STXBP2 was significantly (dominant model; P = 4.84 x 10-8; odds ratio, 2.94) associated with myocardial infarction. STXBP2 may thus be a novel susceptibility locus for myocardial infarction in Japanese.
STXBP2 Gene Polymorphism is associated with Hemophagocytic Lymphohistocytosis.
Mutation in STXBP2 gene is associated with hemophagocytic lymphohistiocytosis.
Data show that Munc18b overexpression increased fusion of not only newcomer secretory granule (SG), but also predocked SGs in type-2 diabetes (T2D) human and Goto-Kakizaki Rat Islets.
two novel mutations of STXBP2: c.184A>G and c.577A>C. c.184A>G (p.Asn62Asp) was located within a highly conserved region of the STXBP2 protein and predicted to be deleterious.
mutations result in severe chronic active Epstein-Barr virus disease
red blood cells express Munc18-2 and that erythroid cells from patients with FHL-5 exhibit intrinsic defects caused by STXBP2/Munc18-2 mutations.
Munc18-2(R65Q) and Munc18-2(R65W) retain the ability to interact with and stabilize STX11. However, presence of Munc18-2(R65Q/W) in patient-derived lymphocytes and forced expression in control CTLs and NK cells diminishes degranulation and cytotoxicity.
Data show that all but one patient with atypical familial hemophagocytic lymphohistiocytosis carried at least one splice-site mutation in UNC13D or STXBP2.
Munc18-2 binds the N-terminal peptide of Stx11 with a ~20-fold higher affinity than Stx3, suggesting a potential role in selective binding.
We report that FHL-5 neutrophils have a profound defect in granule mobilization, resulting in inadequate bacterial killing, in particular, of gram-negative Escherichia coli, but not of Staphylococcus aureus.
Mutations in STXBP2 do not only affect cytotoxic T lymphocytes but also cause changes in the intestinal and renal epithelium resulting in severe, osmotic diarrhea and renal proximal tubular dysfunction
Double knockdown of Munc18-1 and Munc18-2 in mast cells eliminates both IgE-dependent and ionomycin-induced degranulation and causes a significant reduction in syntaxin-11 without altering expressions of the other syntaxin isoforms examined.
Novel mutation in STXBP2 prevents IL-2-induced natural killer cell cytotoxicity in familial hemophagocytic lymphohistiocytosis.
We report the largest cohort of patients with FHL5 so far, describe an extended disease spectrum, and demonstrate for the first time a clear genotype-phenotype correlation.
Munc18b is functionally coupled to the assembly of exocytic SNARE complexes and increases exocytosis by interacting with the N-peptide and closed-conformation C-terminus of Stx3, thereby neutralizing the secretion-inhibitory effect of this SNARE.
Missense and splice-site sequence variants in PRF1, MUNC13-4, and STXBP2 were found in 25 (14%) of the adult patients. The A91V-PRF1 genotype was found in 12 of these patients (48%).
results indicate that Munc18-2, but not Munc18-1 or Munc18-3, is essential for regulated exocytosis in platelets and platelet participation in thrombosis and hemostasis.
observed an almost complete absence of exocytosis in Munc18-2-deficient MCs but intact exocytosis in MCs lacking Munc18-1 or Munc18-3
SNARE zippering requires activation by SNARE-like peptides in Sec1/Munc18 proteins
Munc18b as an essential gene that is a limiting component of the exocytic machinery of epithelial cells and mast cell.
Munc18-1 and Munc18-2 display distinct subcellular compartmentalization and can coordinate the insulin exocytotic process differently as a consequence of the actual [Ca(2+)](i).
This gene encodes a member of the STXBP/unc-18/SEC1 family. The encoded protein is involved in intracellular trafficking, control of SNARE (soluble NSF attachment protein receptor) complex assembly, and the release of cytotoxic granules by natural killer cells. Mutations in this gene are associated with familial hemophagocytic lymphohistiocytosis. Alternatively spliced transcript variants encoding different isoforms have been noted for this gene.
syntaxin-binding protein 2
, protein unc-18 homolog B
, protein unc-18 homolog 2
, syntaxin binding protein Munc18-2
, unc-18 homolog 2
, Sec1 homolog