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2017 ; 2
(ä): 17027
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Cyclic-di-GMP regulates lipopolysaccharide modification and contributes to
Pseudomonas aeruginosa immune evasion
#MMPMID28263305
McCarthy RR
; Mazon-Moya MJ
; Moscoso JA
; Hao Y
; Lam JS
; Bordi C
; Mostowy S
; Filloux A
Nat Microbiol
2017[Mar]; 2
(ä): 17027
PMID28263305
show ga
Pseudomonas aeruginosa is a Gram-negative bacterial pathogen associated with
acute and chronic infections. The universal cyclic-di-GMP second messenger is
instrumental in the switch from a motile lifestyle to resilient biofilm as in the
cystic fibrosis lung. The SadC diguanylate cyclase is associated with this
patho-adaptive transition. Here, we identify an unrecognized SadC partner, WarA,
which we show is a methyltransferase in complex with a putative kinase, WarB. We
established that WarA binds to cyclic-di-GMP, which potentiates its
methyltransferase activity. Together, WarA and WarB have structural similarities
with the bifunctional Escherichia coli lipopolysaccharide (LPS) O antigen
regulator WbdD. Strikingly, WarA influences P. aeruginosa O antigen modal
distribution and interacts with the LPS biogenesis machinery. LPS is known to
modulate the immune response in the host, and by using a zebrafish infection
model, we implicate WarA in the ability of P. aeruginosa to evade detection by
the host.