1W26

Trigger Factor in Complex with the Ribosome forms a Molecular Cradle for Nascent Proteins

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.324 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.241 

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This is version 1.2 of the entry. See complete history. 


Literature

Trigger Factor in Complex with the Ribosome Forms a Molecular Cradle for Nascent Proteins

Ferbitz, L., Maier, T., Patzelt, H., Bukau, B., Deuerling, E., Ban, N.

(2004) Nature 431: 590

  • DOI: 10.1038/nature02899
  • Primary Citation of Related Structures:  
    1W26, 1W2B

  • PubMed Abstract: 

    • During protein biosynthesis, nascent polypeptide chains that emerge from the ribosomal exit tunnel encounter ribosome-associated chaperones, which assist their folding to the native state. Here we present a 2.7 A crystal structure of Escherichia coli trigger factor, the best-characterized chaperone of this type, together with the structure of its ribosome-binding domain in complex with the Haloarcula marismortui large ribosomal subunit ...

    During protein biosynthesis, nascent polypeptide chains that emerge from the ribosomal exit tunnel encounter ribosome-associated chaperones, which assist their folding to the native state. Here we present a 2.7 A crystal structure of Escherichia coli trigger factor, the best-characterized chaperone of this type, together with the structure of its ribosome-binding domain in complex with the Haloarcula marismortui large ribosomal subunit. Trigger factor adopts a unique conformation resembling a crouching dragon with separated domains forming the amino-terminal ribosome-binding 'tail', the peptidyl-prolyl isomerase 'head', the carboxy-terminal 'arms' and connecting regions building up the 'back'. From its attachment point on the ribosome, trigger factor projects the extended domains over the exit of the ribosomal tunnel, creating a protected folding space where nascent polypeptides may be shielded from proteases and aggregation. This study sheds new light on our understanding of co-translational protein folding, and suggests an unexpected mechanism of action for ribosome-associated chaperones.

    Organizational Affiliation: 

    Institut für Molekularbiologie und Biophysik, Eidgenössische Technische Hochschule Hönggerberg (ETH Zürich), HPK Gebäude, CH-8093 Zürich, Switzerland.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TRIGGER FACTORA, B432Escherichia coliMutation(s): 0 
EC: 5.2.1.8
UniProt
Find proteins for P0A850 (Escherichia coli (strain K12))
Explore P0A850 
Go to UniProtKB:  P0A850
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A850
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE		A, B L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.324 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.241 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.251α = 90
b = 47.415β = 113.66
c = 114.831γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-09-02
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance