Crystal Structure of Twin Arginine Translocase Receptor- TatC in DDM

Experimental Data Snapshot

  • Resolution: 6.80 Å
  • R-Value Free: 0.418 
  • R-Value Work: 0.344 
  • R-Value Observed: 0.344 

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The Glove-like Structure of the Conserved Membrane Protein TatC Provides Insight into Signal Sequence Recognition in Twin-Arginine Translocation.

Ramasamy, S.Abrol, R.Suloway, C.J.Clemons, W.M.

(2013) Structure 21: 777-788

  • DOI: https://doi.org/10.1016/j.str.2013.03.004
  • Primary Citation of Related Structures:  
    4HTS, 4HTT

  • PubMed Abstract: 

    In bacteria, two signal-sequence-dependent secretion pathways translocate proteins across the cytoplasmic membrane. Although the mechanism of the ubiquitous general secretory pathway is becoming well understood, that of the twin-arginine translocation pathway, responsible for translocation of folded proteins across the bilayer, is more mysterious. TatC, the largest and most conserved of three integral membrane components, provides the initial binding site of the signal sequence prior to pore assembly. Here, we present two crystal structures of TatC from the thermophilic bacteria Aquifex aeolicus at 4.0 Å and 6.8 Å resolution. The membrane architecture of TatC includes a glove-shaped structure with a lipid-exposed pocket predicted by molecular dynamics to distort the membrane. Correlating the biochemical literature to these results suggests that the signal sequence binds in this pocket, leading to structural changes that facilitate higher order assemblies.

  • Organizational Affiliation

    Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sec-independent protein translocase protein TatC, Lysozyme
A, B
418Aquifex aeolicus VF5Tequatrovirus T4
This entity is chimeric
Mutation(s): 0 
Gene Names: tatCaq_1267E
Membrane Entity: Yes 
Find proteins for O67305 (Aquifex aeolicus (strain VF5))
Explore O67305 
Go to UniProtKB:  O67305
Find proteins for P00720 (Enterobacteria phage T4)
Explore P00720 
Go to UniProtKB:  P00720
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP00720O67305
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 6.80 Å
  • R-Value Free: 0.418 
  • R-Value Work: 0.344 
  • R-Value Observed: 0.344 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 142.015α = 90
b = 142.015β = 90
c = 251.748γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
Blu-Icedata collection
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-05-01
    Type: Initial release
  • Version 1.1: 2013-05-29
    Changes: Database references
  • Version 1.2: 2017-08-09
    Changes: Advisory, Refinement description, Source and taxonomy
  • Version 1.3: 2019-07-17
    Changes: Data collection, Refinement description
  • Version 1.4: 2024-02-28
    Changes: Advisory, Data collection, Database references