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3.75 A resolution cryo-electron microscopy structure of the membrane-associated helical polymer of human dynamin-1 in the GMPPCP-bound state
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Cellular fluorescein hyperfluorescence is dynamin-dependent.
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The twin siblings exhibit mild to moderate intellectual disability and autistic symptoms but no epileptic encephalopathy. Exome sequencing revealed a genetic variant, c.1603A>G (p.Lys535Glu), in the PH domain of dynamin 1. The twin sisters studied here share the de novo variant, c.1603A>G (p.Lys535Glu) in exon 15 of DNM1, classified as likely pathogenic.
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The data show that the dynamin-amphiphysin helices are rearranged to form clusters upon GTP hydrolysis and membrane constriction occurs at protein-uncoated regions flanking the clusters.
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Together, these observations suggest that while endophilin helps shape endocytic tubules and recruit dynamin to endocytic sites, it can also block membrane fission when present in excess by inhibiting inter-dynamin interactions.
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The authors show that in fibroblasts, dynamin GTP hydrolysis occurs as stochastic bursts, which are randomly distributed relatively to the peak of dynamin assembly. Thus, dynamin disassembly is not coupled to GTPase activity, supporting that the GTP energy is primarily spent in constriction.
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Dynamin isoforms differentially regulate the endocytosis and apoptotic signaling downstream of TRAIL-death receptor (TRAIL-DR) complexes in cancer cells. TRAIL stimulation activates ryanodine receptor-mediated calcium release from endoplasmic reticulum stores, leading to calcineurin-mediated dephosphorylation and activation of Dyn1, TRAIL-DR endocytosis, and increased resistance to TRAIL-induced apoptosis.
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Three genes in our epilepsy cohort (COQ4, DNM1, and PURA), accounting for 14% (3/21) of all novel genetic etiologies identified in patients with epilepsy, were subsequently confirmed in independent publications.
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Study delineates the phenotypic spectrum of DNM1 encephalopathy, an emerging disease of synaptic vesicle fission characterized by severe to profound developmental delay, infantile-onset epilepsy beginning with infantile spasms, and movement disorder. The genetic landscape of DNM1 encephalopathy is notable for the recurrent c.709C>T (p.Arg237Trp) variant and localization of mutations to specific domains of the protein.
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CLCb/Dyn1-dependent adaptive clathrin-mediated endocytosis selectively altered EGF receptor trafficking.
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interation of DG with laminin and dynamin is involved in the regulation of AQP4 internalization
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Down-regulation of Dyn1 activity enhances extracellular Nme1 in human colon tumor cell lines.
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Hypoxic down-regulation of constitutive endocytosis is HIF-independent, and involves caveolin-1-mediated inhibition of dynamin-dependent, membrane raft endocytosis.
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study reports 2 patients with early onset epileptic encephalopathy possessing de novo DNM1 mutations; detected the novel mutation c.127G>A (p.Gly43Ser) in a patient with Lennox-Gastaut syndrome, and a recurrent mutation c.709C>T (p.Arg237Trp) in a patient with West syndrome
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The rare variants in DNM1 were significantly associated with smoking status.
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Data indicate that stimulation of the dynamin GTPase activity by SH3 domains is determined by its middle domain.
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molecular simulations corroborate the bimodal character of dynamin action and indicate radial and axial forces as dominant, although not independent, drivers of hemi-fission and fission membrane- transformations, respectively
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Data indicate the dynamics of a dynamin 1-catalysed GTP hydrolysis and tube-severing reaction in real time using fluorescence microscopy.
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This study identified and confirmed DNM1 protein changes within the postsynaptic density in schizophrenia.
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findings support a role for HTT on dynamin 1 function and ER homoeostasis. Proteolysis-induced alteration of this function may be relevant to disease.
