5HX1

Crystal structure of DR2231_E46A mutant in complex with dUMP and magnesium


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.175 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Deinococcus radiodurans DR2231 is a two-metal-ion mechanism hydrolase with exclusive activity on dUTP.

Mota, C.S.Goncalves, A.M.de Sanctis, D.

(2016) FEBS J 283: 4274-4290

  • DOI: https://doi.org/10.1111/febs.13923
  • Primary Citation of Related Structures:  
    5HVA, 5HWU, 5HX1, 5HYL, 5HZZ, 5I0J, 5I0M

  • PubMed Abstract: 

    DR2231 from Deinococcus radiodurans was previously functionally and structurally characterized as an all-α NTP pyrophosphohydrolase with specific dUTPase activity. dUTPases have a central role in the regulation of dUTP intracellular levels and dTTP nucleotide metabolism. DR2231 presents a conserved dimetal catalytic site, similar to all-α dimeric dUTPases, but contrary to these enzymes, it is unable to process dUDP. In this article, we present functional and structural evidence of single-point mutations that affect directly or indirectly the enzyme catalysis and provide a complete description of the all-α NTP pyrophosphohydrolase mechanism. Activity assays, isothermal titration calorimetry and the crystal structures of these mutants obtained in complex with dUMP or a dUTP analogue aid in probing the reaction mechanism. Our results demonstrate that the two metals are necessary for enzyme processing and also important to modulate the substrate binding affinity. Single-point mutations located in a structurally mobile lid-like loop show that the interactions with the nucleoside monophosphate are essential for induction of the closed conformation and ultimately for substrate processing. β- and γ-phosphates are held in place through coordination with the second metal, which is responsible for the substrate 'gauche' orientation in the catalytic position. The lack of sufficient contacts to orient the dUDP β-phosphate for hydrolysis explains DR2231 preference towards dUTP. Sequence and structural similarities with MazG proteins suggest that a similar mechanism might be conserved within the protein family. Structural data are available in the PDB under the accession numbers 5HVA, 5HWU, 5HX1, 5HYL, 5I0J, 5HZZ, 5I0M.


  • Organizational Affiliation

    ESRF - The European Synchrotron, Grenoble Cedex 9, France.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DR2231
A, B, C, D
138Deinococcus radioduransMutation(s): 1 
Gene Names: DR_2231
UniProt
Find proteins for Q9RS96 (Deinococcus radiodurans (strain ATCC 13939 / DSM 20539 / JCM 16871 / CCUG 27074 / LMG 4051 / NBRC 15346 / NCIMB 9279 / VKM B-1422 / R1))
Explore Q9RS96 
Go to UniProtKB:  Q9RS96
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9RS96
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.175 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 148.827α = 90
b = 77.813β = 90
c = 52.266γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Fundacao para a Ciencia e tecnologiaPortugalSFRH/BEST/51724/2011

Revision History  (Full details and data files)

  • Version 1.0: 2016-10-26
    Type: Initial release
  • Version 1.1: 2016-12-14
    Changes: Database references
  • Version 1.2: 2018-04-04
    Changes: Data collection, Source and taxonomy, Structure summary
  • Version 1.3: 2024-01-10
    Changes: Data collection, Database references, Derived calculations, Refinement description