Solution structure of the LysM region of the E. coli Intimin periplasmic domain

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 95 
  • Conformers Submitted: 23 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


The Intimin periplasmic domain mediates dimerisation and binding to peptidoglycan.

Leo, J.C.Oberhettinger, P.Chaubey, M.Schutz, M.Kuhner, D.Bertsche, U.Schwarz, H.Gotz, F.Autenrieth, I.B.Coles, M.Linke, D.

(2015) Mol Microbiol 95: 80-100

  • DOI: https://doi.org/10.1111/mmi.12840
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Intimin and Invasin are prototypical inverse (Type Ve) autotransporters and important virulence factors of enteropathogenic Escherichia coli and Yersinia spp. respectively. In addition to a C-terminal extracellular domain and a β-barrel transmembrane domain, both proteins also contain a short N-terminal periplasmic domain that, in Intimin, includes a lysin motif (LysM), which is thought to mediate binding to peptidoglycan. We show that the periplasmic domain of Intimin does bind to peptidoglycan both in vitro and in vivo, but only under acidic conditions. We were able to determine a dissociation constant of 0.8 μM for this interaction, whereas the Invasin periplasmic domain, which lacks a LysM, bound only weakly in vitro and failed to bind peptidoglycan in vivo. We present the solution structure of the Intimin LysM, which has an additional α-helix conserved within inverse autotransporter LysMs but lacking in others. In contrast to previous reports, we demonstrate that the periplasmic domain of Intimin mediates dimerisation. We further show that dimerisation and peptidoglycan binding are general features of LysM-containing inverse autotransporters. Peptidoglycan binding by the periplasmic domain in the infection process may aid in resisting mechanical and chemical stress during transit through the gastrointestinal tract.

  • 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
Intimin115Escherichia coliMutation(s): 1 
Gene Names: eaeeaeAE2348C_3939
Find proteins for P19809 (Escherichia coli O127:H6 (strain E2348/69 / EPEC))
Explore P19809 
Go to UniProtKB:  P19809
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP19809
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 95 
  • Conformers Submitted: 23 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-11-12
    Type: Initial release
  • Version 1.1: 2015-01-14
    Changes: Database references
  • Version 1.2: 2023-06-14
    Changes: Data collection, Database references, Other