1MOK

NADPH DEPENDENT 2-KETOPROPYL COENZYME M OXIDOREDUCTASE/CARBOXYLASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.238 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Structural Basis for CO2 Fixation by a Novel Member of the Disulfide Oxidoreductase Family of Enzymes, 2-Ketopropyl Coenzyme M Oxidoreductase/Carboxylase

Nocek, B.Jang, S.B.Jeong, M.S.Clark, D.D.Ensign, S.A.Peters, J.W.

(2002) Biochemistry 41: 12907-12913

  • DOI: https://doi.org/10.1021/bi026580p
  • Primary Citation of Related Structures:  
    1MO9, 1MOK

  • PubMed Abstract: 

    The NADPH:2-ketopropyl-coenzyme M oxidoreductase/carboxylase (2-KPCC) is the terminal enzyme in a metabolic pathway that results in the conversion of propylene to the central metabolite acetoacetate in Xanthobacter autotrophicus Py2. This enzyme is an FAD-containing enzyme that is a member of the NADPH:disulfide oxidoreductase (DSOR) family of enzymes that include glutathione reductase, dihydrolipoamide dehydrogenase, trypanothione reductase, thioredoxin reductase, and mercuric reductase. In contrast to the prototypical reactions catalyzed by members of the DSOR family, the NADPH:2-ketopropyl-coenzyme M oxidoreductase/carboxylase catalyzes the reductive cleavage of the thioether linkage of 2-ketopropyl-coenzyme M, and the subsequent carboxylation of the ketopropyl cleavage product, yielding the products acetoacetate and free coenzyme M. The structure of 2-KPCC reveals a unique active site in comparison to those of other members of the DSOR family of enzymes and demonstrates how the enzyme architecture has been adapted for the more sophisticated biochemical reaction. In addition, comparison of the structures in the native state and in the presence of bound substrate indicates the binding of the substrate 2-ketopropyl-coenzyme M induces a conformational change resulting in the collapse of the substrate access channel. The encapsulation of the substrate in this manner is reminiscent of the conformational changes observed in the well-characterized CO2-fixing enzyme ribulose 1,5-bisphosphate carboxylase/oxidase (Rubisco).


  • Organizational Affiliation

    Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
orf3
A, B, C, D
523Xanthobacter autotrophicus Py2Mutation(s): 0 
EC: 1.8.1.5
UniProt
Find proteins for Q56839 (Xanthobacter autotrophicus (strain ATCC BAA-1158 / Py2))
Explore Q56839 
Go to UniProtKB:  Q56839
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ56839
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.238 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.6α = 72
b = 87.5β = 73.4
c = 100.7γ = 69.81
Software Package:
Software NamePurpose
Blu-Icedata collection
MOSFLMdata reduction
DENZOdata reduction
SCALEPACKdata scaling
SCALAdata scaling
EPMRphasing
CNSrefinement
CCP4data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-11-27
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.3: 2012-05-09
    Changes: Structure summary
  • Version 1.4: 2017-10-11
    Changes: Refinement description