1SIR

The Crystal Structure and Mechanism of Human Glutaryl-CoA Dehydrogenase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.187 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structures of Human Glutaryl-CoA Dehydrogenase with and without an Alternate Substrate: Structural Bases of Dehydrogenation and Decarboxylation Reactions

Fu, Z.Wang, M.Paschke, R.Rao, K.S.Frerman, F.E.Kim, J.J.

(2004) Biochemistry 43: 9674-9684

  • DOI: 10.1021/bi049290c
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Acyl-CoA dehydrogenases (ACDs) are a family of flavoenzymes that metabolize fatty acids and some amino acids. Of nine known ACDs, glutaryl-CoA dehydrogenase (GCD) is unique: in addition to the alpha,beta-dehydrogenation reaction, common to all ACDs, ...

    Acyl-CoA dehydrogenases (ACDs) are a family of flavoenzymes that metabolize fatty acids and some amino acids. Of nine known ACDs, glutaryl-CoA dehydrogenase (GCD) is unique: in addition to the alpha,beta-dehydrogenation reaction, common to all ACDs, GCD catalyzes decarboxylation of glutaryl-CoA to produce CO(2) and crotonyl-CoA. Crystal structures of GCD and its complex with 4-nitrobutyryl-CoA have been determined to 2.1 and 2.6 A, respectively. The overall polypeptide folds are the same and similar to the structures of other family members. The active site of the unliganded structure is filled with water molecules that are displaced when enzyme binds the substrate. The structure strongly suggests that the mechanism of dehydrogenation is the same as in other ACDs. The substrate binds at the re side of the FAD ring. Glu370 abstracts the C2 pro-R proton, which is acidified by the polarization of the thiolester carbonyl oxygen through hydrogen bonding to the 2'-OH of FAD and the amide nitrogen of Glu370. The C3 pro-R proton is transferred to the N(5) atom of FAD. The structures indicate a plausible mechanism for the decarboxylation reaction. The carbonyl polarization initiates decarboxylation, and Arg94 stabilizes the transient crotonyl-CoA anion. Protonation of the crotonyl-CoA anion occurs by a 1,3-prototropic shift catalyzed by the conjugated acid of the general base, Glu370. A tight hydrogen-bonding network involving gamma-carboxylate of the enzyme-bound glutaconyl-CoA, with Tyr369, Glu87, Arg94, Ser95, and Thr170, optimizes orientation of the gamma-carboxylate for decarboxylation. Some pathogenic mutations are explained by the structure. The mutations affect protein folding, stability, and/or substrate binding, resulting in inefficient/inactive enzyme.


    Organizational Affiliation

    Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutaryl-CoA dehydrogenase
A
394Homo sapiensMutation(s): 0 
Gene Names: GCDH
EC: 1.3.8.6
Find proteins for Q92947 (Homo sapiens)
Go to Gene View: GCDH
Go to UniProtKB:  Q92947
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NBC
Query on NBC

Download SDF File 
Download CCD File 
A
S-4-NITROBUTYRYL-COA
C25 H41 N8 O19 P3 S
PXNIOQHGCSEKCC-CITAKDKDSA-N
 Ligand Interaction
FAD
Query on FAD

Download SDF File 
Download CCD File 
A
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.187 
  • Space Group: P 64 2 2
Unit Cell:
Length (Å)Angle (°)
a = 116.722α = 90.00
b = 116.722β = 90.00
c = 128.034γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
CNSphasing
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-09-07
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance