1RX0

Crystal structure of isobutyryl-CoA dehydrogenase complexed with substrate/ligand.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.77 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.179 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structures of Isobutyryl-CoA Dehydrogenase and Enzyme-Product Complex: COMPARISON WITH ISOVALERYL- AND SHORT-CHAIN ACYL-COA DEHYDROGENASES.

Battaile, K.P.Nguyen, T.V.Vockley, J.Kim, J.J.

(2004) J.Biol.Chem. 279: 16526-16534

  • DOI: 10.1074/jbc.M400034200

  • PubMed Abstract: 
  • The acyl-CoA dehydrogenases are a family of mitochondrial flavoproteins involved in the catabolism of fatty and amino acids. Isobutyryl-CoA dehydrogenase (IBD) is involved in the catabolism of valine and catalyzes the conversion of isobutyryl-CoA to ...

    The acyl-CoA dehydrogenases are a family of mitochondrial flavoproteins involved in the catabolism of fatty and amino acids. Isobutyryl-CoA dehydrogenase (IBD) is involved in the catabolism of valine and catalyzes the conversion of isobutyryl-CoA to methacrylyl-CoA. The crystal structure of IBD with and without substrate has been determined to 1.76-A resolution. The asymmetric unit contains a homotetramer with substrate/product bound in two monomers. The overall structure of IBD is similar to those of previously determined acyl-CoA dehydrogenases and consists of an NH2-terminal alpha-helical domain, a medial beta-strand domain and a C-terminal alpha-helical domain. The enzyme-bound ligand has been modeled in as the reaction product, methacrylyl-CoA. The location of Glu-376 with respect to the C-2-C-3 of the bound product and FAD confirms Glu-376 to be the catalytic base. IBD has a shorter and wider substrate-binding cavity relative to short-chain acyl-CoA dehydrogenase, permitting the optimal binding of the isobutyryl-CoA substrate. The dramatic lateral expansion of the binding cavity seen in isovaleryl-CoA dehydrogenase is not observed in IBD. The conserved tyrosine or phenylalanine that defines a side of the binding cavity in other acyl-CoA dehydrogenases is replaced by a leucine (Leu-375) in the current structure. Substrate binding changes the position of some residues lining the binding pocket as well as the position of the loop containing the catalytic glutamate and subsequent helix. Three clinical mutations have been modeled to the structure. The mutations do not affect substrate binding but instead appear to disrupt protein folding and/or stability.


    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
Acyl-CoA dehydrogenase family member 8, mitochondrial
A, B, C, D
393Homo sapiensGene Names: ACAD8 (ARC42, IBD)
EC: 1.3.99.-
Find proteins for Q9UKU7 (Homo sapiens)
Go to Gene View: ACAD8
Go to UniProtKB:  Q9UKU7
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FAD
Query on FAD

Download SDF File 
Download CCD File 
A, B, C, D
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
EDO
Query on EDO

Download SDF File 
Download CCD File 
A, B, C, D
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
2MC
Query on 2MC

Download SDF File 
Download CCD File 
C, D
METHACRYLYL-COENZYME A
C25 H40 N7 O17 P3 S
NPALUEYCDZWBOV-NDZSKPAWSA-N
 Ligand Interaction
ACY
Query on ACY

Download SDF File 
Download CCD File 
A, B, C, D
ACETIC ACID
C2 H4 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.77 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.179 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 97.204α = 90.00
b = 134.343β = 90.00
c = 189.641γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
DENZOdata reduction
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-04-20
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2018-01-31
    Type: Experimental preparation