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2017 ; 216
(7
): 2151-2166
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BAIAP3, a C2 domain-containing Munc13 protein, controls the fate of dense-core
vesicles in neuroendocrine cells
#MMPMID28626000
Zhang X
; Jiang S
; Mitok KA
; Li L
; Attie AD
; Martin TFJ
J Cell Biol
2017[Jul]; 216
(7
): 2151-2166
PMID28626000
show ga
Dense-core vesicle (DCV) exocytosis is a SNARE (soluble
N-ethylmaleimide-sensitive fusion attachment protein receptor)-dependent
anterograde trafficking pathway that requires multiple proteins for regulation.
Several C2 domain-containing proteins are known to regulate Ca(2+)-dependent DCV
exocytosis in neuroendocrine cells. In this study, we identified others by
screening all (?139) human C2 domain-containing proteins by RNA interference in
neuroendocrine cells. 40 genes were identified, including several encoding
proteins with known roles (CAPS [calcium-dependent activator protein for
secretion 1], Munc13-2, RIM1, and SYT10) and many with unknown roles. One of the
latter, BAIAP3, is a secretory cell-specific Munc13-4 paralog of unknown
function. BAIAP3 knockdown caused accumulation of fusion-incompetent DCVs in BON
neuroendocrine cells and lysosomal degradation (crinophagy) of insulin-containing
DCVs in INS-1 ? cells. BAIAP3 localized to endosomes was required for Golgi
trans-Golgi network 46 (TGN46) recycling, exhibited Ca(2+)-stimulated
interactions with TGN SNAREs, and underwent Ca(2+)-stimulated TGN recruitment.
Thus, unlike other Munc13 proteins, BAIAP3 functions indirectly in DCV exocytosis
by affecting DCV maturation through its role in DCV protein recycling. Ca(2+)
rises that stimulate DCV exocytosis may stimulate BAIAP3-dependent retrograde
trafficking to maintain DCV protein homeostasis and DCV function.