Structure of the tetrameric building block of the Salmonella Typhimurium PrgI Type three secretion system needle

Experimental Data Snapshot

  • Conformers Calculated: 640 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with the lowest energy 

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Atomic structure and handedness of the building block of a biological assembly.

Loquet, A.Habenstein, B.Chevelkov, V.Vasa, S.K.Giller, K.Becker, S.Lange, A.

(2013) J Am Chem Soc 135: 19135-19138

  • DOI: https://doi.org/10.1021/ja411362q
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Noncovalent supramolecular assemblies possess in general several unique subunit-subunit interfaces.The basic building block of such an assembly consists of several subunits and contains all unique interfaces. Atomic-resolution structures of monomeric subunits are typically accessed by crystallography or solution NMR and fitted into electron microscopy density maps. However, the structure of the intact building block in the assembled state remains unknown with this hybrid approach. Here, we present the solid-state NMR atomic structure of the building block of the type III secretion system needle. The building block structure consists of a homotetrameric subunit complex with three unique supramolecular interfaces. Side-chain positions at the interfaces were solved at atomic detail. The high-resolution structure reveals unambiguously the helical handedness of the assembly, determined to be right-handed for the type III secretion system needle.Additionally, the axial rise per subunit could be extracted from the tetramer structure and independently validated by mass-per-length measurements.

  • Organizational Affiliation

    Department of NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry , Am Fassberg 11, 37077 Göttingen, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein PrgI
A, B, C, D
80Salmonella enterica subsp. enterica serovar Typhimurium str. LT2Mutation(s): 0 
Gene Names: prgISTM2873
Find proteins for P41784 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P41784 
Go to UniProtKB:  P41784
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP41784
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Conformers Calculated: 640 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-12-25
    Type: Initial release
  • Version 1.1: 2014-01-15
    Changes: Database references, Experimental preparation