8JO3

Cryo-EM structure of a Legionella effector complexed with actin and AMP


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.66 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: in silico
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Legionella effector LnaB is a phosphoryl AMPylase that impairs phosphosignalling.

Wang, T.Song, X.Tan, J.Xian, W.Zhou, X.Yu, M.Wang, X.Xu, Y.Wu, T.Yuan, K.Ran, Y.Yang, B.Fan, G.Liu, X.Zhou, Y.Zhu, Y.

(2024) Nature 631: 393-401

  • DOI: https://doi.org/10.1038/s41586-024-07573-z
  • Primary Citation of Related Structures:  
    8JO3, 8JO4, 8XEP

  • PubMed Abstract: 

    AMPylation is a post-translational modification in which AMP is added to the amino acid side chains of proteins 1,2 . 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 R42 -Ub that is generated by the SidE family of effectors, and deubiquitinases DupA and DupB in an E1- and E2-independent ubiquitination process 3-7 . The product of LnaB is further hydrolysed by an ADP-ribosylhydrolase, MavL, to Ub, thereby preventing the accumulation of PR R42 -Ub and ADPR R42 -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 8,9 , 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.


  • Organizational Affiliation

    Department of Gastroenterology of the Second Affiliated Hospital, School of Medicine and College of Animal Sciences, Life Sciences Institute, Zhejiang University, Hangzhou, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Substrate of the Dot/Icm secretion system436Legionella sainthelensiMutation(s): 0 
Gene Names: CAB17_03485
UniProt
Find proteins for A0A2H5FI52 (Legionella sainthelensi)
Explore A0A2H5FI52 
Go to UniProtKB:  A0A2H5FI52
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A2H5FI52
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Actin, alpha skeletal muscle377Oryctolagus cuniculusMutation(s): 0 
EC: 3.6.4
UniProt
Find proteins for P68135 (Oryctolagus cuniculus)
Explore P68135 
Go to UniProtKB:  P68135
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP68135
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.66 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIXdev_4694:

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China81925024
National Natural Science Foundation of China (NSFC)China21974002
National Natural Science Foundation of China (NSFC)China22174003
Ministry of Science and Technology (MoST, China)China2017YFA0503900

Revision History  (Full details and data files)

  • Version 1.0: 2024-05-01
    Type: Initial release
  • Version 1.1: 2024-07-03
    Changes: Data collection, Database references
  • Version 1.2: 2024-07-24
    Changes: Data collection, Database references