Crystal structure of Legionella effector sdeD (lpg2509)

Experimental Data Snapshot

  • Resolution: 1.51 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.169 

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This is version 1.5 of the entry. See complete history


Mechanism of phosphoribosyl-ubiquitination mediated by a single Legionella effector.

Akturk, A.Wasilko, D.J.Wu, X.Liu, Y.Zhang, Y.Qiu, J.Luo, Z.Q.Reiter, K.H.Brzovic, P.S.Klevit, R.E.Mao, Y.

(2018) Nature 557: 729-733

  • DOI: https://doi.org/10.1038/s41586-018-0147-6
  • Primary Citation of Related Structures:  
    6B7M, 6B7O, 6B7P, 6B7Q

  • PubMed Abstract: 

    Ubiquitination is a post-translational modification that regulates many cellular processes in eukaryotes 1-4 . The conventional ubiquitination cascade culminates in a covalent linkage between the C terminus of ubiquitin (Ub) and a target protein, usually on a lysine side chain 1,5 . Recent studies of the Legionella pneumophila SidE family of effector proteins revealed a ubiquitination method in which a phosphoribosyl ubiquitin (PR-Ub) is conjugated to a serine residue on substrates via a phosphodiester bond 6-8 . Here we present the crystal structure of a fragment of the SidE family member SdeA that retains ubiquitination activity, and determine the mechanism of this unique post-translational modification. The structure reveals that the catalytic module contains two distinct functional units: a phosphodiesterase domain and a mono-ADP-ribosyltransferase domain. Biochemical analysis shows that the mono-ADP-ribosyltransferase domain-mediated conversion of Ub to ADP-ribosylated Ub (ADPR-Ub) and the phosphodiesterase domain-mediated ligation of PR-Ub to substrates are two independent activities of SdeA. Furthermore, we present two crystal structures of a homologous phosphodiesterase domain from the SidE family member SdeD 9 in complexes with Ub and ADPR-Ub. The structures suggest a mechanism for how SdeA processes ADPR-Ub to PR-Ub and AMP, and conjugates PR-Ub to a serine residue in substrates. Our study establishes the molecular mechanism of phosphoribosyl-linked ubiquitination and will enable future studies of this unusual type of ubiquitination in eukaryotes.

  • Organizational Affiliation

    Weill Institute for Cell and Molecular Biology and Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
383Legionella pneumophilaMutation(s): 0 
Find proteins for Q6RCQ7 (Legionella pneumophila)
Explore Q6RCQ7 
Go to UniProtKB:  Q6RCQ7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6RCQ7
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.51 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.169 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 154.349α = 90
b = 154.349β = 90
c = 89.568γ = 120
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01-GM094347

Revision History  (Full details and data files)

  • Version 1.0: 2018-04-18
    Type: Initial release
  • Version 1.1: 2018-06-06
    Changes: Data collection, Database references
  • Version 1.2: 2018-06-13
    Changes: Data collection, Database references
  • Version 1.3: 2019-02-20
    Changes: Author supporting evidence, Data collection
  • Version 1.4: 2020-01-01
    Changes: Author supporting evidence
  • Version 1.5: 2024-03-13
    Changes: Data collection, Database references, Refinement description