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10.1091/mbc.E16-08-0617

http://scihub22266oqcxt.onion/10.1091/mbc.E16-08-0617
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suck abstract from ncbi


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pmid28100639
      Mol+Biol+Cell 2017 ; 28 (6 ): 792-808
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  • Munc13-4 functions as a Ca(2+) sensor for homotypic secretory granule fusion to generate endosomal exocytic vacuoles #MMPMID28100639
  • Woo SS ; James DJ ; Martin TF
  • Mol Biol Cell 2017[Mar]; 28 (6 ): 792-808 PMID28100639 show ga
  • Munc13-4 is a Ca(2+)-dependent SNARE (soluble N-ethylmaleimide-sensitive factor attachment protein receptor)- and phospholipid-binding protein that localizes to and primes secretory granules (SGs) for Ca(2+)-evoked secretion in various secretory cells. Studies in mast cell-like RBL-2H3 cells provide direct evidence that Munc13-4 with its two Ca(2+)-binding C2 domains functions as a Ca(2+) sensor for SG exocytosis. Unexpectedly, Ca(2+) stimulation also generated large (>2.4 ?m in diameter) Munc13-4(+)/Rab7(+)/Rab11(+) endosomal vacuoles. Vacuole generation involved the homotypic fusion of Munc13-4(+)/Rab7(+) SGs, followed by a merge with Rab11(+) endosomes, and depended on Ca(2+) binding to Munc13-4. Munc13-4 promoted the Ca(2+)-stimulated fusion of VAMP8-containing liposomes with liposomes containing exocytic or endosomal Q-SNAREs and directly interacted with late endosomal SNARE complexes. Thus Munc13-4 is a tethering/priming factor and Ca(2+) sensor for both heterotypic SG-plasma membrane and homotypic SG-SG fusion. Total internal reflection fluorescence microscopy imaging revealed that vacuoles were exocytic and mediated secretion of ?-hexosaminidase and cytokines accompanied by Munc13-4 diffusion onto the plasma membrane. The results provide new molecular insights into the mechanism of multigranular compound exocytosis commonly observed in various secretory cells.
  • |Animals [MESH]
  • |Calcium/metabolism [MESH]
  • |Carrier Proteins/metabolism [MESH]
  • |Cell Line [MESH]
  • |Endosomes/metabolism/physiology [MESH]
  • |Exocytosis/physiology [MESH]
  • |Membrane Fusion/physiology [MESH]
  • |Protein Transport [MESH]
  • |Proteins/genetics/*metabolism/*physiology [MESH]
  • |Rats [MESH]
  • |SNARE Proteins/metabolism [MESH]
  • |Secretory Vesicles/physiology [MESH]
  • |Soluble N-Ethylmaleimide-Sensitive Factor Attachment Proteins/metabolism [MESH]


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