4MKI

Cobalt transporter ATP-binding subunit


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Structural basis for a homodimeric ATPase subunit of an ECF transporter

Chai, C.L.Yu, Y.Zhuo, W.Zhao, H.Li, X.Wang, N.Chai, J.Yang, M.

(2013) Protein Cell 4: 793-801

  • DOI: https://doi.org/10.1007/s13238-013-3915-y
  • Primary Citation of Related Structures:  
    4MKI

  • PubMed Abstract: 

    The transition metal cobalt, an essential cofactor for many enzymes in prokaryotes, is taken up by several specific transport systems. The CbiMNQO protein complex belongs to type-1 energy-coupling factor (ECF) transporters and is a widespread group of microbial cobalt transporters. CbiO is the ATPase subunit (A-component) of the cobalt transporting system in the gram-negative thermophilic bacterium Thermoanaerobacter tengcongensis. Here we report the crystal structure of a nucleotide-free CbiO at a resolution of 2.3 Å. CbiO contains an N-terminal canonical nucleotide-binding domain (NBD) and C-terminal helical domain. Structural and biochemical data show that CbiO forms a homodimer mediated by the NBD and the C-terminal domain. Interactions mainly via conserved hydrophobic amino acids between the two C-terminal domains result in formation of a four-helix bundle. Structural comparison with other ECF transporters suggests that non-conserved residues outside the T-component binding groove in the A component likely act as a specificity determinant for T components. Together, our data provide information on understanding of the structural organization and interaction of the CbiMNQO system.


  • Organizational Affiliation

    College of Biological Sciences, China Agricultural University, Beijing, 100083, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Energy-coupling factor transporter ATP-binding protein EcfA2A [auth B],
B [auth A]
298Caldanaerobacter subterraneus subsp. tengcongensis MB4Mutation(s): 0 
Gene Names: ecfA2cbiO2
EC: 3.6.3
UniProt
Find proteins for Q8R7Y5 (Caldanaerobacter subterraneus subsp. tengcongensis (strain DSM 15242 / JCM 11007 / NBRC 100824 / MB4))
Explore Q8R7Y5 
Go to UniProtKB:  Q8R7Y5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8R7Y5
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 110.229α = 90
b = 115.163β = 90
c = 54.416γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
PHASESphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-10-30
    Type: Initial release
  • Version 1.1: 2014-06-11
    Changes: Structure summary
  • Version 1.2: 2024-03-20
    Changes: Data collection, Database references, Derived calculations, Refinement description