3M47

Crystal structure of the mutant I218A of orotidine 5'-monophosphate decarboxylase from Methanobacterium thermoautotrophicum


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.20 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.228 

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


Literature

Conformational changes in orotidine 5'-monophosphate decarboxylase: "remote" residues that stabilize the active conformation.

Wood, B.M.Amyes, T.L.Fedorov, A.A.Fedorov, E.V.Shabila, A.Almo, S.C.Richard, J.P.Gerlt, J.A.

(2010) Biochemistry 49: 3514-3516

  • DOI: https://doi.org/10.1021/bi100443a
  • Primary Citation of Related Structures:  
    3LHT, 3LHU, 3LHV, 3LHW, 3LHY, 3LHZ, 3LI1, 3LLD, 3LLF, 3LTP, 3LTS, 3LTY, 3LV5, 3LV6, 3M1Z, 3M41, 3M43, 3M44, 3M47, 3M5X, 3M5Y, 3M5Z

  • PubMed Abstract: 

    The structural factors responsible for the extraordinary rate enhancement ( approximately 10(17)) of the reaction catalyzed by orotidine 5'-monophosphate decarboxylase (OMPDC) have not been defined. Catalysis requires a conformational change that closes an active site loop and "clamps" the orotate base proximal to hydrogen-bonded networks that destabilize the substrate and stabilize the intermediate. In the OMPDC from Methanobacter thermoautotrophicus, a "remote" structurally conserved cluster of hydrophobic residues that includes Val 182 in the active site loop is assembled in the closed, catalytically active conformation. Substitution of these residues with Ala decreases k(cat)/K(m) with a minimal effect on k(cat), providing evidence that the cluster stabilizes the closed conformation. The intrinsic binding energies of the 5'-phosphate group of orotidine 5'-monophosphate for the mutant enzymes are similar to that for the wild type, supporting this conclusion.


  • Organizational Affiliation

    Department of Biochemistry, University of Illinois, Urbana, Illinois 61801, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Orotidine 5'-phosphate decarboxylase
A, B
228Methanothermobacter thermautotrophicus str. Delta HMutation(s): 2 
Gene Names: pyrFMTH_129
EC: 4.1.1.23
UniProt
Find proteins for O26232 (Methanothermobacter thermautotrophicus (strain ATCC 29096 / DSM 1053 / JCM 10044 / NBRC 100330 / Delta H))
Explore O26232 
Go to UniProtKB:  O26232
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO26232
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.20 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.228 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.905α = 90
b = 56.908β = 90
c = 125.452γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
BALBESphasing
PHENIXrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-06-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2021-10-06
    Changes: Database references, Derived calculations
  • Version 1.3: 2023-09-06
    Changes: Data collection, Refinement description