3ZOP

Arg90Cit chorismate mutase of Bacillus subtilis at 1.6 A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.61 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 2.2 of the entry. See complete history


Literature

Electrostatic Transition State Stabilization Rather Than Reactant Destabilization Provides the Chemical Basis for Efficient Chorismate Mutase Catalysis.

Burschowsky, D.Van Eerde, A.Okvist, M.Kienhofer, A.Kast, P.Hilvert, D.Krengel, U.

(2014) Proc Natl Acad Sci U S A 111: 17516

  • DOI: https://doi.org/10.1073/pnas.1408512111
  • Primary Citation of Related Structures:  
    3ZO8, 3ZOP, 3ZP4, 3ZP7

  • PubMed Abstract: 

    For more than half a century, transition state theory has provided a useful framework for understanding the origins of enzyme catalysis. As proposed by Pauling, enzymes accelerate chemical reactions by binding transition states tighter than substrates, thereby lowering the activation energy compared with that of the corresponding uncatalyzed process. This paradigm has been challenged for chorismate mutase (CM), a well-characterized metabolic enzyme that catalyzes the rearrangement of chorismate to prephenate. Calculations have predicted the decisive factor in CM catalysis to be ground state destabilization rather than transition state stabilization. Using X-ray crystallography, we show, in contrast, that a sluggish variant of Bacillus subtilis CM, in which a cationic active-site arginine was replaced by a neutral citrulline, is a poor catalyst even though it effectively preorganizes chorismate for the reaction. A series of high-resolution molecular snapshots of the reaction coordinate, including the apo enzyme, and complexes with substrate, transition state analog and product, demonstrate that an active site, which is only complementary in shape to a reactive substrate conformer, is insufficient for effective catalysis. Instead, as with other enzymes, electrostatic stabilization of the CM transition state appears to be crucial for achieving high reaction rates.


  • Organizational Affiliation

    Department of Chemistry, University of Oslo, NO-0315 Oslo, Norway; and.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CHORISMATE MUTASE AROH
A, B, C, D, E
A, B, C, D, E, F
127Bacillus subtilisMutation(s): 2 
EC: 5.4.99.5
UniProt
Find proteins for P19080 (Bacillus subtilis (strain 168))
Explore P19080 
Go to UniProtKB:  P19080
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP19080
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
CIR
Query on CIR
A, B, C, D, E
A, B, C, D, E, F
L-PEPTIDE LINKINGC6 H13 N3 O3ARG
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.61 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.134α = 97.84
b = 51.131β = 92.97
c = 69.906γ = 101.26
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-04-16
    Type: Initial release
  • Version 1.1: 2014-11-26
    Changes: Database references
  • Version 1.2: 2014-12-03
    Changes: Database references
  • Version 1.3: 2014-12-10
    Changes: Database references
  • Version 1.4: 2014-12-24
    Changes: Database references
  • Version 2.0: 2023-11-15
    Changes: Atomic model, Data collection, Database references, Derived calculations, Other
  • Version 2.1: 2023-12-20
    Changes: Refinement description
  • Version 2.2: 2024-10-23
    Changes: Structure summary