1SG4

Crystal structure of human mitochondrial delta3-delta2-enoyl-CoA isomerase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.3 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.157 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The 1.3 A crystal structure of human mitochondrial Delta3-Delta2-enoyl-CoA isomerase shows a novel mode of binding for the fatty acyl group.

Partanen, S.T.Novikov, D.K.Popov, A.N.Mursula, A.M.Hiltunen, J.K.Wierenga, R.K.

(2004) J.Mol.Biol. 342: 1197-1208

  • DOI: 10.1016/j.jmb.2004.07.039

  • PubMed Abstract: 
  • The crystal structure of Delta3-Delta2-enoyl-CoA isomerase from human mitochondria (hmEci), complexed with the substrate analogue octanoyl-CoA, has been refined at 1.3 A resolution. This enzyme takes part in the beta-oxidation of unsaturated fatty ac ...

    The crystal structure of Delta3-Delta2-enoyl-CoA isomerase from human mitochondria (hmEci), complexed with the substrate analogue octanoyl-CoA, has been refined at 1.3 A resolution. This enzyme takes part in the beta-oxidation of unsaturated fatty acids by converting both cis-3 and trans-3-enoyl-CoA esters (with variable length of the acyl group) to trans-2-enoyl-CoA. hmEci belongs to the hydratase/isomerase (crotonase) superfamily. Most of the enzymes belonging to this superfamily are hexamers, but hmEci is shown to be a trimer. The mode of binding of the ligand, octanoyl-CoA, shows that the omega-end of the acyl group binds in a hydrophobic tunnel formed by residues of the loop preceding helix H4 as well as by side-chains of the kinked helix H9. From the structure of the complex it can be seen that Glu136 is the only catalytic residue. The importance of Glu136 for catalysis is confirmed by mutagenesis studies. A cavity analysis shows the presence of two large, adjacent empty hydrophobic cavities near the active site, which are shaped by side-chains of helices H1, H2, H3 and H4. The structure comparison of hmEci with structures of other superfamily members, in particular of rat mitochondrial hydratase (crotonase) and yeast peroxisomal enoyl-CoA isomerase, highlights the variable mode of binding of the fatty acid moiety in this superfamily.


    Organizational Affiliation

    Biocenter Oulu and Department of Biochemistry, University of Oulu, PO Box 3000, FIN-90014 University of Oulu, Finland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
3,2-trans-enoyl-CoA isomerase, mitochondrial
A, B, C
260Homo sapiensMutation(s): 0 
Gene Names: ECI1 (DCI)
EC: 5.3.3.8
Find proteins for P42126 (Homo sapiens)
Go to Gene View: ECI1
Go to UniProtKB:  P42126
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CO8
Query on CO8

Download SDF File 
Download CCD File 
B
OCTANOYL-COENZYME A
C29 H50 N7 O17 P3 S
KQMZYOXOBSXMII-CECATXLMSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.3 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.157 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 100.984α = 90.00
b = 78.288β = 116.39
c = 113.209γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
SHELXL-97refinement
SHELXDphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-01-18
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance