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2016 ; 45
(1
): 94-105
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Ubiquitination of Innate Immune Regulator TRAF3 Orchestrates Expulsion of
Intracellular Bacteria by Exocyst Complex
#MMPMID27438768
Miao Y
; Wu J
; Abraham SN
Immunity
2016[Jul]; 45
(1
): 94-105
PMID27438768
show ga
Although the intracellular trafficking system is integral to most physiologic
activities, its role in mediating immune responses to infection has remained
elusive. Here, we report that infected bladder epithelial cells (BECs) mobilized
the exocyst complex, a powerful exporter of subcellular vesicles, to rapidly
expel intracellular bacteria back for clearance. Toll-like receptor (TLR) 4
signals emanating from bacteria-containing vesicles (BCVs) were found to trigger
K33-linked polyubiquitination of TRAF3 at Lys168, which was then detected by
RalGDS, a guanine nucleotide exchange factor (GEF) that precipitated the assembly
of the exocyst complex. Although this distinct modification of TRAF3 served to
connect innate immune signaling to the cellular trafficking apparatus, it
crucially ensured temporal and spatial accuracy in determining which among the
many subcellular vesicles was recognized and selected for expulsion in response
to innate immune signaling.