National Natural Science Foundation of China (NSFC)
81925024
中国
National Natural Science Foundation of China (NSFC)
21974002
中国
National Natural Science Foundation of China (NSFC)
22174003
中国
Ministry of Science and Technology (MoST, China)
2017YFA0503900
中国
引用
ジャーナル: Nature / 年: 2024 タイトル: Legionella effector LnaB is a phosphoryl-AMPylase that impairs phosphosignalling. 著者: Ting Wang / Xiaonan Song / Jiaxing Tan / Wei Xian / Xingtong Zhou / Mingru Yu / Xiaofei Wang / Yan Xu / Ting Wu / Keke Yuan / Yu Ran / Bing Yang / Gaofeng Fan / Xiaoyun Liu / Yan Zhou / Yongqun Zhu / 要旨: AMPylation is a post-translational modification in which AMP is added to the amino acid side chains of proteins. Here we show that, with ATP as the ligand and actin as the host activator, the ...AMPylation is a post-translational modification in which AMP is added to the amino acid side chains of proteins. Here we show that, with ATP as the ligand and actin as the host activator, the effector protein LnaB of Legionella pneumophila exhibits AMPylase activity towards the phosphoryl group of phosphoribose on PR-Ub that is generated by the SidE family of effectors, and deubiquitinases DupA and DupB in an E1- and E2-independent ubiquitination process. The product of LnaB is further hydrolysed by an ADP-ribosylhydrolase, MavL, to Ub, thereby preventing the accumulation of PR-Ub and ADPR-Ub and protecting canonical ubiquitination in host cells. LnaB represents a large family of AMPylases that adopt a common structural fold, distinct from those of the previously known AMPylases, and LnaB homologues are found in more than 20 species of bacterial pathogens. Moreover, LnaB also exhibits robust phosphoryl AMPylase activity towards phosphorylated residues and produces unique ADPylation modifications in proteins. During infection, LnaB AMPylates the conserved phosphorylated tyrosine residues in the activation loop of the Src family of kinases, which dampens downstream phosphorylation signalling in the host. Structural studies reveal the actin-dependent activation and catalytic mechanisms of the LnaB family of AMPylases. This study identifies, to our knowledge, an unprecedented molecular regulation mechanism in bacterial pathogenesis and protein phosphorylation.