1pn4
From Proteopedia
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'''Crystal structure of 2-enoyl-CoA hydratase 2 domain of Candida tropicalis multifunctional enzyme type 2 complexed with (3R)-hydroxydecanoyl-CoA.''' | '''Crystal structure of 2-enoyl-CoA hydratase 2 domain of Candida tropicalis multifunctional enzyme type 2 complexed with (3R)-hydroxydecanoyl-CoA.''' | ||
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[[Category: Hiltunen, J K.]] | [[Category: Hiltunen, J K.]] | ||
[[Category: Koski, M K.]] | [[Category: Koski, M K.]] | ||
| - | [[Category: | + | [[Category: Enzyme-product complex]] |
| - | [[Category: | + | [[Category: Hot-dog fold]] |
| - | [[Category: | + | [[Category: Hydratase 2 motif]] |
| - | [[Category: | + | [[Category: Oxyanion hole]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 05:16:10 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 02:16, 3 May 2008
Crystal structure of 2-enoyl-CoA hydratase 2 domain of Candida tropicalis multifunctional enzyme type 2 complexed with (3R)-hydroxydecanoyl-CoA.
Overview
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.
About this Structure
1PN4 is a Single protein structure of sequence from Candida tropicalis. Full crystallographic information is available from OCA.
Reference
A two-domain structure of one subunit explains unique features of eukaryotic hydratase 2., Koski MK, Haapalainen AM, Hiltunen JK, Glumoff T, J Biol Chem. 2004 Jun 4;279(23):24666-72. Epub 2004 Mar 29. PMID:15051722 Page seeded by OCA on Sat May 3 05:16:10 2008
