Structure of virulence factor SghA from Agrobacterium tumefaciens

Experimental Data Snapshot

  • Resolution: 1.92 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.176 

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Agrobacteria reprogram virulence gene expression by controlled release of host-conjugated signals.

Wang, C.Ye, F.Chang, C.Liu, X.Wang, J.Wang, J.Yan, X.F.Fu, Q.Zhou, J.Chen, S.Gao, Y.G.Zhang, L.H.

(2019) Proc Natl Acad Sci U S A 116: 22331-22340

  • DOI: https://doi.org/10.1073/pnas.1903695116
  • Primary Citation of Related Structures:  
    6RJK, 6RJM, 6RJO, 6RK2

  • PubMed Abstract: 

    It is highly intriguing how bacterial pathogens can quickly shut down energy-costly infection machinery once successful infection is established. This study depicts that mutation of repressor SghR increases the expression of hydrolase SghA in Agrobacterium tumefaciens , which releases plant defense signal salicylic acid (SA) from its storage form SA β-glucoside (SAG). Addition of SA substantially reduces gene expression of bacterial virulence. Bacterial vir genes and sghA are differentially transcribed at early and later infection stages, respectively. Plant metabolite sucrose is a signal ligand that inactivates SghR and consequently induces sghA expression. Disruption of sghA leads to increased vir expression in planta and enhances tumor formation whereas mutation of sghR decreases vir expression and tumor formation. These results depict a remarkable mechanism by which A. tumefaciens taps on the reserved pool of plant signal SA to reprogram its virulence upon establishment of infection.

  • Organizational Affiliation

    Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, 510642 Guangzhou, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
490Agrobacterium tumefaciens A6Mutation(s): 0 
Gene Names: sghA
Find proteins for A0A2I4PGZ0 (Agrobacterium tumefaciens A6)
Explore A0A2I4PGZ0 
Go to UniProtKB:  A0A2I4PGZ0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A2I4PGZ0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.92 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.176 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.24α = 90
b = 80.39β = 90
c = 184.62γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling
Cootmodel building

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Research Foundation (Singapore)SingaporeNRF-RF2009-RF001-267
National Basic Research Program of China (973 Program)China2015CB150600

Revision History  (Full details and data files)

  • Version 1.0: 2019-10-09
    Type: Initial release
  • Version 1.1: 2019-10-23
    Changes: Data collection, Database references
  • Version 1.2: 2019-11-06
    Changes: Data collection, Database references
  • Version 1.3: 2024-01-24
    Changes: Author supporting evidence, Data collection, Database references, Refinement description