Trigger Factor

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.239 

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This is version 1.5 of the entry. See complete history


The crystal structure of ribosomal chaperone trigger factor from Vibrio cholerae.

Ludlam, A.V.Moore, B.A.Xu, Z.

(2004) Proc Natl Acad Sci U S A 101: 13436-13441

  • DOI: https://doi.org/10.1073/pnas.0405868101
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Trigger factor is a molecular chaperone that is present in all species of eubacteria. It binds to the ribosomal 50S subunit near the translation exit tunnel and is thought to be the first protein to interact with nascent polypeptides emerging from the ribosome. The chaperone has a peptidyl-prolyl cis-trans isomerase (PPIase) activity that catalyzes the rate-limiting proline isomerization in the protein-folding process. We have determined the crystal structure of nearly full-length trigger factor from Vibrio cholerae by x-ray crystallography at 2.5-A resolution. The structure is composed of two trigger-factor molecules related by a noncrystallographic two-fold symmetry axis. The monomer has an elongated shape and is folded into three domains: an N-terminal domain I that binds to the ribosome, a central domain II that contains PPIase activity, and a C-terminal domain III. The active site of the PPIase domain is occupied by a loop from domain III, suggesting that the PPIase activity of the protein could be regulated. The dimer interface is formed between domains I and III and contains residues of mixed properties. Further implications about dimerization, ribosome binding, and other functions of trigger factor are discussed.

  • Organizational Affiliation

    Department of Biological Chemistry, Medical School and Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Trigger factor
A, B
392Vibrio choleraeMutation(s): 0 
Gene Names: TIGVC1923
Find proteins for Q9KQS5 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Explore Q9KQS5 
Go to UniProtKB:  Q9KQS5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9KQS5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.239 
  • Space Group: I 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 189.86α = 90
b = 189.86β = 90
c = 62.06γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
d*TREKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-09-21
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2024-02-14
    Changes: Data collection, Database references
  • Version 1.5: 2024-04-03
    Changes: Refinement description