1PN4 image
Entry Detail
PDB ID:
1PN4
Keywords:
Title:
Crystal structure of 2-enoyl-CoA hydratase 2 domain of Candida tropicalis multifunctional enzyme type 2 complexed with (3R)-hydroxydecanoyl-CoA.
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2003-06-12
Release Date:
2004-04-13
Method Details:
Experimental Method:
Resolution:
2.35 Å
R-Value Free:
0.22
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Peroxisomal hydratase-dehydrogenase-epimerase
Mutations:E627M, H813Q
Chain IDs:A, B, C, D
Chain Length:280
Number of Molecules:4
Biological Source:Candida tropicalis
Primary Citation
A Two-domain Structure of One Subunit Explains Unique Features of Eukaryotic Hydratase 2.
J.Biol.Chem. 279 24666 24672 (2004)
PMID: 15051722 DOI: 10.1074/jbc.M400293200

Abstact

2-Enoyl-CoA hydratase 2, a part from multifunctional enzyme type 2, hydrates trans-2-enoyl-CoA to 3-hydroxyacyl-CoA in the (3R)-hydroxy-dependent route of peroxisomal beta-oxidation of fatty acids. Unliganded and (3R)-hydroxydecanoyl coenzyme A-complexed crystal structures of 2-enoyl-CoA hydratase 2 from Candida tropicalis multifunctional enzyme type 2 were solved to 1.95- and 2.35-A resolution, respectively. 2-Enoyl-CoA hydratase 2 is a dimeric, alpha+beta protein with a novel quaternary structure. The overall structure of the two-domain subunit of eukaryotic 2-enoyl-CoA hydratase 2 resembles the homodimeric, hot dog fold structures of prokaryotic (R)-specific 2-enoyl-CoA hydratase and beta-hydroxydecanoyl thiol ester dehydrase. Importantly, though, the eukaryotic hydratase 2 has a complete hot dog fold only in its C-domain, whereas the N-domain lacks a long central alpha-helix, thus creating space for bulkier substrates in the binding pocket and explaining the observed difference in substrate preference between eukaryotic and prokaryotic enzymes. Although the N- and C-domains have an identity of <10% at the amino acid level, they share a 50% identity at the nucleotide level and fold similarly. We suggest that a subunit of 2-enoyl-CoA hydratase 2 has evolved via a gene duplication with the concomitant loss of one catalytic site. The hydrogen bonding network of the active site of 2-enoyl-CoA hydratase 2 resembles the active site geometry of mitochondrial (S)-specific 2-enoyl-CoA hydratase 1, although in a mirror image fashion. This arrangement allows the reaction to occur by similar mechanism, supported by mutagenesis and mechanistic studies, although via reciprocal stereochemistry.

Legend

Protein

Chemical

Disease

Primary Citation of related structures