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Glucose-dependent de-SUMOylation of tomosyn1 at K298 releases syntaxin1A (show STX1A Proteins) and controls the amplification of exocytosis in concert with a recently-identified tomosyn1-interacting partner; the Ca(2+)-binding protein (show PVALB Proteins) secretagogin (show SCGN Proteins), which dissociates from tomosyn1 in response to Ca(2 (show CA2 Proteins)+)-raising stimuli and is required for insulin (show INS Proteins) granule trafficking and exocytosis downstream of Ca(2 (show CA2 Proteins)+) influx.
Significant alterations in protein expression were identified in each neuronal ceroid lipofuscinoses (NCLs), including reduced STXBP1 in CLN1 (show PPT1 Proteins) disease brain. Given the confounding variable of post-mortem changes, additional validation is required, but this study provides a useful starting set of candidate NCL (show CLN5 Proteins) biomarkers for further evaluation.
Mutated STXBP1 gene associated with early-onset Epileptic Encephalopathy and severe psychomotor development retardation that occurs within 3 months of age.
Mutations in STXBP1 encoding the syntaxin binding protein 1 can produce a phenotype similar to that of KCNQ2 (show KCNQ2 Proteins) mutations
9q33.3q34.11 microdeletion including STXBP1 gene identified in four patients with intellectual disability, epilepsy, nail (show CD244 Proteins) dysplasia and bone malformations.
We report the case of a 19-month-old child with Ohtahara syndrome who displays a previously unreported mutation in STXBP1 This mutation is located in a donor splice site and eliminates exon 14, resulting in a truncated protein
We conducted a cohort study to analyze STXBP1 in 42 patients with epileptic encephalopathy. We identified four novel mutations: two splicing mutations, a frameshift mutation, and a nonsense mutation.
Reduced expression of STXBP1 leads to changes in the expression and localization of syntaxin-1 (show STX1A Proteins) in pluripotent stem cells from epileptic encephalopathy patient.
Seizure severity and intellectual disability were connected to STXBP1 encephalopathy patients.
partial STXBP1 loss of function robustly impairs neurotransmitter release in human neurons, and suggest that heterozygous STXBP1 mutations cause early epileptic encephalopathy specifically through a presynaptic impairment.
SFK-dependent Munc18-1 phosphorylation may constitute a potent, previously unknown mechanism to shut down synaptic transmission, via direct occlusion of a Synaptobrevin/VAMP2 binding groove and subsequent hindrance of conformational changes in domain 3a responsible for vesicle priming.
This study demonstrated that the disruption of Munc18-1 function may result in the abnormal corticogenesis, leading to neurodevelopmental disorders with MUNC18-1 gene abnormalities.
Findings suggest that synaptic impairments of the dorsal telencephalic and subcortical excitatory neurons cause learning deficits and enhanced aggression in Stxbp1+/- mice, respectively.
proteins, such as syntaxin-1, Munc18-1, or SNAP-25, modulate alpha-synuclein neuropathy and/or are dysregulated in Alzheimer's disease, understanding this type of neurodegeneration may provide new links between synaptic defects and neurodegeneration in humans
This results of study concluded that a conformational change within helix 12 is responsible for the essential postdocking role of Munc18-1 in neurosecretion.
In this studying the Munc18-1-/- nervous system, we demonstrate that synaptic activity is dispensable for the early formation of spinal motor circuits at the levels of axon guidance, differentiation of transcriptional identity, and mRNA expression.
Vamp2 (show VAMP2 Proteins) mutations that impair Munc18-1 binding inhibit spontaneous as well as evoked neurotransmitter release, providing evidence for the Vamp2 (show VAMP2 Proteins)-regulating function of Munc18-1 in synaptic exocytosis.
A dynamic PKC phosphorylation/de-phosphorylation cycle of Munc18-1 drives short-term enhancement of transmitter release during post-tetanic potentiation.
miR-218 and miR-322 directly interact with Stxbp1 by targeting the 3'UTR of its mRNA.
Munc18-1 levels correlate with synaptic strength.
Epilepsy, Behavioral Abnormalities, and Physiological Comorbidities in Syntaxin-Binding Protein 1 (STXBP1) Mutant Zebrafish.
This gene encodes a syntaxin-binding protein. The encoded protein appears to play a role in release of neurotransmitters via regulation of syntaxin, a transmembrane attachment protein receptor. Mutations in this gene have been associated with infantile epileptic encephalopathy-4. Alternatively spliced transcript variants have been described.
, neuronal SEC1
, protein unc-18 homolog 1
, protein unc-18 homolog A
, syntaxin-binding protein 1
, UNC-18 homolog
, minisatellite 10g detected by probe MMS10
, unc-18 homolog
, syntaxin 1-binding protein
, syntaxin binding protein 1
, Ras opposite
, syntaxin-binding protein 1-like