Salmonella enterica SadA 1049-1304 fused to GCN4 adaptors (SadAK9-cfI)

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.225 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Complete Fiber Structures of Complex Trimeric Autotransporter Adhesins Conserved in Enterobacteria.

Hartmann, M.D.Grin, I.Dunin-Horkawicz, S.Deiss, S.Linke, D.Lupas, A.N.Hernandez Alvarez, B.

(2012) Proc Natl Acad Sci U S A 109: 20907

  • DOI: https://doi.org/10.1073/pnas.1211872110
  • Primary Citation of Related Structures:  
    2YNY, 2YNZ, 2YO0, 2YO1, 2YO2, 2YO3

  • PubMed Abstract: 

    Trimeric autotransporter adhesins (TAAs) are modular, highly repetitive surface proteins that mediate adhesion to host cells in a broad range of Gram-negative pathogens. Although their sizes may differ by more than one order of magnitude, they all follow the same basic head-stalk-anchor architecture, where the head mediates adhesion and autoagglutination, the stalk projects the head from the bacterial surface, and the anchor provides the export function and attaches the adhesin to the bacterial outer membrane after export is complete. In complex adhesins, head and stalk domains may alternate several times before the anchor is reached. Despite extensive sequence divergence, the structures of TAA domains are highly constrained, due to the tight interleaving of their constituent polypeptide chains. We have therefore taken a "domain dictionary" approach to characterize representatives for each domain type by X-ray crystallography and use these structures to reconstruct complete TAA fibers. With SadA from Salmonella enterica, EhaG from enteropathogenic Escherichia coli (EHEC), and UpaG from uropathogenic E. coli (UPEC), we present three representative structures of a complex adhesin that occur in a conserved genomic context in Enterobacteria and is essential in the infection process of uropathogenic E. coli. Our work proves the applicability of the dictionary approach to understanding the structure of a class of proteins that are otherwise poorly tractable by high-resolution methods and provides a basis for the rapid and detailed annotation of newly identified TAAs.

  • Organizational Affiliation

    Department of Protein Evolution, Max Planck Institute for Developmental Biology, 72076 Tübingen, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GENERAL CONTROL PROTEIN GCN4, PUTATIVE INNER MEMBRANE PROTEIN322Saccharomyces cerevisiaeSalmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 16 
Find proteins for P03069 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P03069 
Go to UniProtKB:  P03069
Find proteins for Q8ZL64 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore Q8ZL64 
Go to UniProtKB:  Q8ZL64
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP03069Q8ZL64
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on CL

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.225 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54α = 90
b = 54β = 90
c = 306.98γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-12-12
    Type: Initial release
  • Version 1.1: 2013-01-09
    Changes: Database references
  • Version 1.2: 2017-03-15
    Changes: Source and taxonomy
  • Version 1.3: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description