2ET6

(3R)-Hydroxyacyl-CoA Dehydrogenase Domain of Candida tropicalis Peroxisomal Multifunctional Enzyme Type 2

Summary for 2ET6

• Entry DOI: 10.2210/pdb2et6/pdb
• Descriptor: (3R)-hydroxyacyl-CoA dehydrogenase (2 entities in total)
• Functional Keywords: dehydrogenase, mfe-2, beta-oxidation, peroxisome, sdr, oxidoreductase
• Biological source: Candida tropicalis
• Cellular location: Peroxisome: P22414
• Total number of polymer chains: 1
• Total formula weight: 65557.09

Authors

Ylianttila, M.S.,Hiltunen, J.K.,Glumoff, T. (deposition date: 2005-10-27, release date: 2006-05-23, Last modification date: 2024-04-03)

Primary citation

Ylianttila, M.S.,Pursiainen, N.V.,Haapalainen, A.M.,Juffer, A.H.,Poirier, Y.,Hiltunen, J.K.,Glumoff, T.
Crystal Structure of Yeast Peroxisomal Multifunctional Enzyme: Structural Basis for Substrate Specificity of (3R)-hydroxyacyl-CoA Dehydrogenase Units.
J.Mol.Biol., 358:1286-1295, 2006

PubMed Abstract: (3R)-hydroxyacyl-CoA dehydrogenase is part of multifunctional enzyme type 2 (MFE-2) of peroxisomal fatty acid beta-oxidation. The MFE-2 protein from yeasts contains in the same polypeptide chain two dehydrogenases (A and B), which possess difference in substrate specificity. The crystal structure of Candida tropicalis (3R)-hydroxyacyl-CoA dehydrogenase AB heterodimer, consisting of dehydrogenase A and B, determined at the resolution of 2.2A, shows overall similarity with the prototypic counterpart from rat, but also important differences that explain the substrate specificity differences observed. Docking studies suggest that dehydrogenase A binds the hydrophobic fatty acyl chain of a medium-chain-length ((3R)-OH-C10) substrate as bent into the binding pocket, whereas the short-chain substrates are dislocated by two mechanisms: (i) a short-chain-length 3-hydroxyacyl group ((3R)-OH-C4) does not reach the hydrophobic contacts needed for anchoring the substrate into the active site; and (ii) Leu44 in the loop above the NAD(+) cofactor attracts short-chain-length substrates away from the active site. Dehydrogenase B, which can use a (3R)-OH-C4 substrate, has a more shallow binding pocket and the substrate is correctly placed for catalysis. Based on the current structure, and together with the structure of the 2-enoyl-CoA hydratase 2 unit of yeast MFE-2 it becomes obvious that in yeast and mammalian MFE-2s, despite basically identical functional domains, the assembly of these domains into a mature, dimeric multifunctional enzyme is very different.

PubMed: 16574148
DOI: 10.1016/j.jmb.2006.03.001

Experimental method

X-RAY DIFFRACTION (2.22 Å)