2MI2

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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Literature

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

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

(2014) Biochim Biophys Acta 

  • DOI: 10.1016/j.bbamem.2014.03.015
  • Structures With Same Primary Citation

  • 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 t ...

    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; College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China. Electronic address: changwen@pku.edu.cn.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Sec-independent protein translocase protein TatBA109Escherichia coliMutation(s): 0 
Gene Names: 
Find proteins for A0A0D8VEJ4 (Escherichia coli)
Explore A0A0D8VEJ4 
Go to UniProtKB:  A0A0D8VEJ4
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 2MI2 Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-04-30
    Type: Initial release