Solution structure of the E. coli TatB protein in DPC micelles

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.3 of the entry. See complete history


Solution structure of the TatB component of the twin-arginine translocation system.

Zhang, Y.Wang, L.Hu, Y.Jin, C.

(2014) Biochim Biophys Acta 1838: 1881-1888

  • DOI: https://doi.org/10.1016/j.bbamem.2014.03.015
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The twin-arginine protein transport (Tat) system translocates fully folded proteins across lipid membranes. In Escherichia coli, the Tat system comprises three essential components: TatA, TatB and TatC. The protein translocation process is proposed to initiate by signal peptide recognition and substrate binding to the TatBC complex. Upon formation of the TatBC-substrate protein complex, the TatA subunits are recruited and form the protein translocation pore. Experimental evidences suggest that TatB forms a tight complex with TatC at 1:1 molar ratio and the TatBC complex contains multiple copies of both proteins. Cross-linking experiments demonstrate that TatB functions in tetrameric units and interacts with both TatC and substrate proteins. However, structural information of the TatB protein is still lacking, and its functional mechanism remains elusive. Herein, we report the solution structure of TatB in DPC micelles determined by Nuclear Magnetic Resonance (NMR) spectroscopy. Overall, the structure shows an extended 'L-shape' conformation comprising four helices: a transmembrane helix (TMH) α1, an amphipathic helix (APH) α2, and two solvent exposed helices α3 and α4. The packing of TMH and APH is relatively rigid, whereas helices α3 and α4 display notably higher mobility. The observed floppiness of helices α3 and α4 allows TatB to sample a large conformational space, thus providing high structural plasticity to interact with substrate proteins of different sizes and shapes.

  • Organizational Affiliation

    Beijing Nuclear Magnetic Resonance Center, Peking University, Beijing 100871, China; College of Life Sciences, Peking University, Beijing 100871, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sec-independent protein translocase protein TatB109Escherichia coliMutation(s): 0 
Gene Names: tatBLF82_2221
Membrane Entity: Yes 
Find proteins for A0A0D8VEJ4 (Escherichia coli)
Explore A0A0D8VEJ4 
Go to UniProtKB:  A0A0D8VEJ4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0D8VEJ4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 15 
  • 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: 2014-04-30
    Type: Initial release
  • Version 1.1: 2022-08-24
    Changes: Data collection, Database references
  • Version 1.2: 2023-06-14
    Changes: Other
  • Version 1.3: 2024-05-15
    Changes: Data collection, Database references