Solution NMR structure of the membrane electron transporter CcdA

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Solution structure and elevator mechanism of the membrane electron transporter CcdA.

Zhou, Y.Bushweller, J.H.

(2018) Nat Struct Mol Biol 25: 163-169

  • DOI: https://doi.org/10.1038/s41594-018-0022-z
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Membrane oxidoreductase CcdA plays a central role in supplying reducing equivalents from the bacterial cytoplasm to the envelope. It transports electrons across the membrane using a single pair of cysteines by a mechanism that has not yet been elucidated. Here we report an NMR structure of the Thermus thermophilus CcdA (TtCcdA) in an oxidized and outward-facing state. CcdA consists of two inverted structural repeats of three transmembrane helices (2 × 3-TM). We computationally modeled and experimentally validated an inward-facing state, which suggests that CcdA uses an elevator-type movement to shuttle the reactive cysteines across the membrane. CcdA belongs to the LysE superfamily, and thus its structure may be relevant to other LysE clan transporters. Structure comparisons of CcdA, semiSWEET, Pnu, and major facilitator superfamily (MFS) transporters provide insights into membrane transporter architecture and mechanism.

  • Organizational Affiliation

    Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, VA, USA. yz8w@virginia.edu.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome c-type biogenesis protein CcdA232Thermus thermophilus HB8Mutation(s): 1 
Gene Names: TTHA1409
Membrane Entity: Yes 
Find proteins for Q5SIG0 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
Explore Q5SIG0 
Go to UniProtKB:  Q5SIG0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5SIG0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM078296

Revision History  (Full details and data files)

  • Version 1.0: 2018-01-31
    Type: Initial release
  • Version 1.1: 2018-02-14
    Changes: Database references
  • Version 1.2: 2018-02-21
    Changes: Database references
  • Version 1.3: 2020-01-01
    Changes: Author supporting evidence, Data collection
  • Version 1.4: 2023-06-14
    Changes: Database references, Other