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Alpha-kinase 1 is a cytosolic innate immune receptor for bacterial ADP-Heptose

Ping Zhou  Yang She  Na Dong  Peng Li  Huabin He  Alessio Borio  Qingcui Wu  Shan Lu  Xiaojun Ding  Yong Cao  Yue Xu  Wenqing Gao  Mengqiu Dong  Jingjin Ding  Da-Cheng Wang  Alla Zamyatina  Feng Shao  
【摘要】:Immune recognition of pathogen-associated molecular patterns(PAMPs) by pattern recognition receptors often activates proinflammatory NF-kappaB signalling. Here we combined a transposon screen in Yersinia pseudotuberculosis with biochemical analyses and identified ADP-beta-D-manno-heptose(ADP-Hep), which mediates type Ⅲ secretion systemdependent NF-kappaB activation and cytokine expression. ADP-Hep, but not other heptose metabolites, could enter host cytosol to activate NF-kappaB. A CRISPR-Cas9 screen showed that activation of NF-kappaB by ADP-Hep involves an ALPK1(alpha-kinase 1)-TIFA(TRAF-interacting protein with forkhead-associated domain) axis. ADP-Hep directly binds the N-terminal domain of ALPK1, stimulating its kinase domain to phosphorylate and activate TIFA. The crystal structure of the N-terminal domain of ALPK1 and ADP-Hep in complex revealed the atomic mechanism of this ligand-receptor recognition process. HBP was transformed by host adenylyltransferases into ADP-heptose 7-P, which could activate ALPK1 to a lesser extent than ADP-Hep. ADP-Hep(but not HBP) alone or during bacterial infection induced Alpk1-dependent inflammation in mice. Our findings identify ALPK1 and ADP-Hep as a pattern recognition receptor and an effective immunomodulator, respectively.

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