The Trimeric Structure Of Divalent Cation Tolerance Protein CutA1 From Thermus Thermophilus HB8

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.188 

Starting Model: experimental
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The structures of the CutA1 proteins from Thermus thermophilus and Pyrococcus horikoshii: characterization of metal-binding sites and metal-induced assembly.

Bagautdinov, B.

(2014) Acta Crystallogr Sect F Struct Biol Cryst Commun 70: 404-413

  • DOI: https://doi.org/10.1107/S2053230X14003422
  • Primary Citation of Related Structures:  
    1NZA, 1V6H, 4NYO

  • PubMed Abstract: 

    CutA1 (copper tolerance A1) is a widespread cytoplasmic protein found in archaea, bacteria, plants and animals, including humans. In Escherichia coli it is implicated in divalent metal tolerance, while the mammalian CutA1 homologue has been proposed to mediate brain enzyme acetylcholinesterase activity and copper homeostasis. The X-ray structures of CutA1 from the thermophilic bacterium Thermus thermophilus (TtCutA1) with and without bound Na(+) at 1.7 and 1.9 Å resolution, respectively, and from the hyperthermophilic archaeon Pyrococcus horikoshii (PhCutA1) in complex with Na(+) at 1.8 Å resolution have been determined. Both are short and rigid proteins of about 12 kDa that form intertwined compact trimers in the crystal and solution. The main difference in the structures is a wide-type β-bulge on top of the TtCutA1 trimer. It affords a mechanism for lodging a single-residue insertion in the middle of β2 while preserving the interprotomer main-chain hydrogen-bonding network. The liganded forms of the proteins provide new structural information about the metal-binding sites and CutA1 assembly. The Na(+)-TtCutA1 structure unveils a dodecameric assembly with metal ions in the trimer-trimer interfaces and the lateral clefts of the trimer. For Na(+)-PhCutA1, the metal ion associated with six waters in an octahedral geometry. The structures suggest that CutA1 may contribute to regulating intracellular metal homeostasis through various binding modes.

  • Organizational Affiliation

    Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Divalent Cation Tolerance Protein CutA1
A, B, C
103Thermus thermophilusMutation(s): 0 
Gene Names: CutA
Find proteins for Q7SIA8 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
Explore Q7SIA8 
Go to UniProtKB:  Q7SIA8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7SIA8
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on SO4

Download Ideal Coordinates CCD File 
O4 S
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.188 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.753α = 90
b = 71.753β = 90
c = 100.399γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-12-23
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2014-05-07
    Changes: Database references
  • Version 1.4: 2014-05-14
    Changes: Derived calculations
  • Version 1.5: 2023-10-25
    Changes: Data collection, Database references, Derived calculations, Refinement description