共 33 条
3-O-deacylation of lipid A by PagL, a PhoP/PhoQ-regulated deacylase of Salmonella typhimurium, modulates signaling through Toll-like receptor 4
被引:127
作者:

Kawasaki, K
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机构: Univ Washington, Dept Microbiol, Seattle, WA 98195 USA

Ernst, RK
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h-index: 0
机构: Univ Washington, Dept Microbiol, Seattle, WA 98195 USA

Miller, SI
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机构:
Univ Washington, Dept Microbiol, Seattle, WA 98195 USA Univ Washington, Dept Microbiol, Seattle, WA 98195 USA
机构:
[1] Univ Washington, Dept Microbiol, Seattle, WA 98195 USA
[2] Univ Washington, Dept Med, Seattle, WA 98195 USA
[3] Univ Washington, Dept Genome Sci, Seattle, WA 98195 USA
关键词:
D O I:
10.1074/jbc.M401275200
中图分类号:
Q5 [生物化学];
Q7 [分子生物学];
学科分类号:
071010 ;
081704 ;
摘要:
Toll-like receptor 4 (TLR4)-mediated responses, which are induced by the lipid A portion of lipopolysaccharide, are important for host defense against Salmonellae infection. A variety of different data indicate that the acylation state of lipid A can alter TLR4-mediated responses. The S. typhimurium virulence gene product PhoP/PhoQ signals the presence of host microenvironments to regulate the expression of a lipid A 3-O-deacylase, PagL, and a lipid A palmitoyltransferase, PagP. We now demonstrate that 3-O-deacylation and palmitoylation of lipid A decreases its ability to induce TLR4-mediated signaling. Deacylated lipid A, deacylated and palmitoylated lipid A, palmitoylated lipid A, and unmodified lipid A species were purified from Escherichia coli heterologously expressing PagL and/or PagP. The purified lipid A preparations showed spectra of a single lipid A species on mass spectrometry and gave a single band on thin layer chromatography. The activity of purified lipid A species was examined using human and mouse cell lines that express recombinant human TLR4. Compared with unmodified lipid A, the modified lipid A species are 30-100-fold less active in the ability to induce NF-kappaB-dependent reporter activation. These results suggest that the lipid A modifications reduce TLR4-signaling as part of Salmonellae adaptation to host environments.
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页码:20044 / 20048
页数:5
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