The effect of a Glu370Asp Mutation in Glutaryl-CoA Dehydrogenase on Proton Transfer to the Dienolate Intermediate

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.191 

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The effect of a Glu370Asp mutation in glutaryl-CoA dehydrogenase on proton transfer to the dienolate intermediate.

Rao, K.S.Fu, Z.Albro, M.Narayanan, B.Baddam, S.Lee, H.J.Kim, J.J.Frerman, F.E.

(2007) Biochemistry 46: 14468-14477

  • DOI: https://doi.org/10.1021/bi7009597
  • Primary Citation of Related Structures:  
    2R0M, 2R0N

  • PubMed Abstract: 

    We have determined steady-state rate constants and net rate constants for the chemical steps in the catalytic pathway catalyzed by the E370D mutant of glutaryl-CoA dehydrogenase and compared them with those of the wild-type dehydrogenase. We sought rationales for changes in these rate constants in the structure of the mutant cocrystallized with the alternate substrate, 4-nitrobutyric acid. Substitution of aspartate for E370, the catalytic base, results in a 24% decrease in the rate constant for proton abstraction at C-2 of 3-thiaglutaryl-CoA as the distance between C-2 of the ligand and the closest carboxyl oxygen at residue 370 increases from 2.9 A to 3.1 A. The net rate constant for flavin reduction due to hydride transfer from C-3 of the natural substrate, which includes proton abstraction at C-2, to N5 of the flavin decreases by 81% due to the mutation, although the distance increases only by 0.7 A. The intensities of charge-transfer bands associated with the enolate of 3-thiaglutaryl-CoA, the reductive half-reaction (reduced flavin with oxidized form of substrate), and the dienolate following decarboxylation are considerably diminished. Structural investigation suggests that the increased distance and the change in angle of the S-C1(=O)-C2 plane of the substrate with the isoalloxazine substantially alter rates of the reductive and oxidative half-reactions. This change in active site geometry also changes the position of protonation of the four carbon dienolate intermediate to produce kinetically favorable product, vinylacetyl-CoA, which is further isomerized to the thermodynamically stable normal product, crotonyl-CoA.

  • Organizational Affiliation

    Department of Pediatrics, University of Colorado at Denver and Health Sciences Center, Aurora, Colorado 80045-0511, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glutaryl-CoA dehydrogenase394Homo sapiensMutation(s): 1 
UniProt & NIH Common Fund Data Resources
Find proteins for Q92947 (Homo sapiens)
Explore Q92947 
Go to UniProtKB:  Q92947
PHAROS:  Q92947
GTEx:  ENSG00000105607 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ92947
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on FAD

Download Ideal Coordinates CCD File 
C27 H33 N9 O15 P2
Query on 4NI

Download Ideal Coordinates CCD File 
C [auth A]4-nitrobutanoic acid
C4 H7 N O4
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.191 
  • Space Group: P 64 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 116.88α = 90
b = 116.88β = 90
c = 128.11γ = 120
Software Package:
Software NamePurpose
CrystalCleardata collection
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-04-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.3: 2023-08-30
    Changes: Data collection, Refinement description