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2017 ; 114
(9
): E1698-E1706
Nephropedia Template TP
gab.com Text
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English Wikipedia
Galectin-3 directs antimicrobial guanylate binding proteins to vacuoles furnished
with bacterial secretion systems
#MMPMID28193861
Feeley EM
; Pilla-Moffett DM
; Zwack EE
; Piro AS
; Finethy R
; Kolb JP
; Martinez J
; Brodsky IE
; Coers J
Proc Natl Acad Sci U S A
2017[Feb]; 114
(9
): E1698-E1706
PMID28193861
show ga
Many invasive bacteria establish pathogen-containing vacuoles (PVs) as
intracellular niches for microbial growth. Immunity to these infections is
dependent on the ability of host cells to recognize PVs as targets for host
defense. The delivery of several host defense proteins to PVs is controlled by
IFN-inducible guanylate binding proteins (GBPs), which themselves dock to PVs
through poorly characterized mechanisms. Here, we demonstrate that GBPs detect
the presence of bacterial protein secretion systems as "patterns of pathogenesis"
associated with PVs. We report that the delivery of GBP2 to Legionella-containing
vacuoles is dependent on the bacterial Dot/Icm secretion system, whereas the
delivery of GBP2 to Yersinia-containing vacuoles (YCVs) requires hypersecretion
of Yersinia translocon proteins. We show that the presence of bacterial secretion
systems directs cytosolic carbohydrate-binding protein Galectin-3 to PVs and that
the delivery of GBP1 and GBP2 to Legionella-containing vacuoles or YCVs is
substantially diminished in Galectin-3-deficient cells. Our results illustrate
that insertion of bacterial secretion systems into PV membranes stimulates
Galectin-3-dependent recruitment of antimicrobial GBPs to PVs as part of a
coordinated host defense program.