6BUR

Crystal structures of cyanuric acid hydrolase from Moorella thermoacetica complexed with barbituric acid


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.18 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.166 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structures of Moorella thermoacetica cyanuric acid hydrolase reveal conformational flexibility and asymmetry important for catalysis.

Shi, K.Cho, S.Aukema, K.G.Lee, T.Bera, A.K.Seffernick, J.L.Wackett, L.P.Aihara, H.

(2019) PLoS One 14: e0216979-e0216979

  • DOI: 10.1371/journal.pone.0216979
  • Primary Citation of Related Structures:  
    6CWJ, 6DHJ, 6BUN, 6BUM, 6BUP, 6BUO, 6BUR, 6BUQ

  • PubMed Abstract: 
  • An ancient enzyme family responsible for the catabolism of the prebiotic chemical cyanuric acid (1,3,5-triazine-2,4,6-triol) was recently discovered and is undergoing proliferation in the modern world due to industrial synthesis and dissemination of 1,3,5-triazine compounds ...

    An ancient enzyme family responsible for the catabolism of the prebiotic chemical cyanuric acid (1,3,5-triazine-2,4,6-triol) was recently discovered and is undergoing proliferation in the modern world due to industrial synthesis and dissemination of 1,3,5-triazine compounds. Cyanuric acid has a highly stabilized ring system such that bacteria require a unique enzyme with a novel fold and subtle active site construction to open the ring. Each cyanuric acid hydrolase monomer consists of three isostructural domains that coordinate and activate the three-fold symmetric substrate cyanuric acid for ring opening. We have now solved a series of X-ray structures of an engineered, thermostable cyanuric acid ring-opening enzyme at 1.51 ~ 2.25 Å resolution, including various complexes with the substrate, a tight-binding inhibitor, or an analog of the reaction intermediate. These structures reveal asymmetric interactions between the enzyme and bound ligands, a metal ion binding coupled to conformational changes and substrate binding important for enzyme stability, and distinct roles of the isostructural domains of the enzyme. The multiple conformations of the enzyme observed across a series of structures and corroborating biochemical data suggest importance of the structural dynamics in facilitating the substrate entry and the ring-opening reaction, catalyzed by a conserved Ser-Lys dyad.


    Organizational Affiliation

    Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, Minnesota, United States of America.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cyanuric acid amidohydrolaseA, B, C, D363Moorella thermoacetica ATCC 39073Mutation(s): 10 
Gene Names: Moth_2120
EC: 3.5.2.15
UniProt
Find proteins for Q2RGM7 (Moorella thermoacetica (strain ATCC 39073 / JCM 9320))
Explore Q2RGM7 
Go to UniProtKB:  Q2RGM7
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.18 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.166 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.075α = 90
b = 89.121β = 90
c = 199.121γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2017-12-11 
  • Released Date: 2019-06-12 
  • Deposition Author(s): Shi, K., Aihara, H.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM095558
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM118047

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-12
    Type: Initial release
  • Version 1.1: 2019-12-25
    Changes: Database references
  • Version 1.2: 2020-01-01
    Changes: Author supporting evidence