5HWU

Crystal Structure of DR2231_E46A mutant in complex with dUMPNPP and Manganese


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.201 

wwPDB Validation 3D Report Full Report


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: 10.1111/febs.13923
  • Primary Citation of Related Structures:  

  • 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 n ...

    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.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DR2231
A, B
138Deinococcus radiodurans (strain ATCC 13939 / DSM 20539 / JCM 16871 / LMG 4051 / NBRC 15346 / NCIMB 9279 / R1 / VKM B-1422)Mutation(s): 1 
Find proteins for Q9RS96 (Deinococcus radiodurans (strain ATCC 13939 / DSM 20539 / JCM 16871 / LMG 4051 / NBRC 15346 / NCIMB 9279 / R1 / VKM B-1422))
Go to UniProtKB:  Q9RS96
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DUP
Query on DUP

Download SDF File 
Download CCD File 
B
2'-DEOXYURIDINE 5'-ALPHA,BETA-IMIDO-TRIPHOSPHATE
C9 H16 N3 O13 P3
XZLLMTSKYYYJLH-SHYZEUOFSA-N
 Ligand Interaction
MN
Query on MN

Download SDF File 
Download CCD File 
A, B
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
DUPKd: 5350 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.201 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 52.263α = 90.00
b = 78.014β = 90.00
c = 141.958γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
PDB_EXTRACTdata extraction
SCALAdata scaling
PHENIXrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


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

Revision History 

  • Version 1.0: 2016-10-26
    Type: Initial release
  • Version 1.1: 2016-12-14
    Type: Database references
  • Version 1.2: 2018-01-24
    Type: Source and taxonomy
  • Version 1.3: 2018-04-04
    Type: Data collection, Structure summary