dCTP deaminase-dUTPase from Bacillus halodurans

Experimental Data Snapshot

  • Resolution: 2.35 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.209 

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Ligand Structure Quality Assessment 

This is version 1.3 of the entry. See complete history


Bacillus halodurans Strain C125 Encodes and Synthesizes Enzymes from Both Known Pathways To Form dUMP Directly from Cytosine Deoxyribonucleotides.

Oehlenschlger, C.B.Lvgreen, M.N.Reinauer, E.Lehtinen, E.Pind, M.L.Harris, P.Martinussen, J.Willemoes, M.

(2015) Appl Environ Microbiol 81: 3395-3404

  • DOI: https://doi.org/10.1128/AEM.00268-15
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Analysis of the genome of Bacillus halodurans strain C125 indicated that two pathways leading from a cytosine deoxyribonucleotide to dUMP, used for dTMP synthesis, were encoded by the genome of the bacterium. The genes that were responsible, the comEB gene and the dcdB gene, encoding dCMP deaminase and the bifunctional dCTP deaminase:dUTPase (DCD:DUT), respectively, were both shown to be expressed in B. halodurans, and both genes were subject to repression by the nucleosides thymidine and deoxycytidine. The latter nucleoside presumably exerts its repression after deamination by cytidine deaminase. Both comEB and dcdB were cloned, overexpressed in Escherichia coli, and purified to homogeneity. Both enzymes were active and displayed the expected regulatory properties: activation by dCTP for dCMP deaminase and dTTP inhibition for both enzymes. Structurally, the B. halodurans enzyme resembled the Mycobacterium tuberculosis enzyme the most. An investigation of sequenced genomes from other species of the genus Bacillus revealed that not only the genome of B. halodurans but also the genomes of Bacillus pseudofirmus, Bacillus thuringiensis, Bacillus hemicellulosilyticus, Bacillus marmarensis, Bacillus cereus, and Bacillus megaterium encode both the dCMP deaminase and the DCD:DUT enzymes. In addition, eight dcdB homologs from Bacillus species within the genus for which the whole genome has not yet been sequenced were registered in the NCBI Entrez database.

  • Organizational Affiliation

    Metabolic Signaling and Regulation Group, Department of Systems Biology, Technical University of Denmark, Lyngby, Denmark.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Deoxycytidine triphosphate deaminase177Halalkalibacterium halodurans C-125Mutation(s): 0 
Gene Names: dcdBH0368
Find proteins for Q9KFV3 (Halalkalibacterium halodurans (strain ATCC BAA-125 / DSM 18197 / FERM 7344 / JCM 9153 / C-125))
Explore Q9KFV3 
Go to UniProtKB:  Q9KFV3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9KFV3
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on TTP

Download Ideal Coordinates CCD File 
G [auth A]
J [auth C]
M [auth E]
N [auth B]
P [auth D]
G [auth A],
J [auth C],
M [auth E],
N [auth B],
P [auth D],
S [auth F]
C10 H17 N2 O14 P3
Query on PEG

Download Ideal Coordinates CCD File 
C4 H10 O3
Query on MG

Download Ideal Coordinates CCD File 
H [auth A]
K [auth C]
L [auth E]
O [auth B]
Q [auth D]
H [auth A],
K [auth C],
L [auth E],
O [auth B],
Q [auth D],
R [auth F]
Experimental Data & Validation

Experimental Data

  • Resolution: 2.35 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.209 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.72α = 90
b = 55.63β = 97.36
c = 95.6γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata 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: 2015-03-18
    Type: Initial release
  • Version 1.1: 2015-05-06
    Changes: Database references
  • Version 1.2: 2018-01-17
    Changes: Data collection
  • Version 1.3: 2024-01-10
    Changes: Data collection, Database references, Derived calculations, Refinement description