1ikt
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(New page: 200px<br /> <applet load="1ikt" size="450" color="white" frame="true" align="right" spinBox="true" caption="1ikt, resolution 1.75Å" /> '''LIGANDED STEROL CAR...)
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Revision as of 15:24, 12 November 2007
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LIGANDED STEROL CARRIER PROTEIN TYPE 2 (SCP-2) LIKE DOMAIN OF HUMAN MULTIFUNCTIONAL ENZYME TYPE 2 (MFE-2)
Contents |
Overview
beta-Oxidation of amino acyl coenzyme A (acyl-CoA) species in mammalian, peroxisomes can occur via either multifunctional enzyme type 1 (MFE-1) or, type 2 (MFE-2), both of which catalyze the hydration of trans-2-enoyl-CoA, and the dehydrogenation of 3-hydroxyacyl-CoA, but with opposite chiral, specificity. MFE-2 has a modular organization of three domains. The, function of the C-terminal domain of the mammalian MFE-2, which shows, similarity with sterol carrier protein type 2 (SCP-2), is unclear. Here, the structure of the SCP-2-like domain comprising amino acid residues, 618-736 of human MFE-2 (d Delta h Delta SCP-2L) was solved at 1.75 A, resolution in complex with Triton X-100, an analog of a lipid molecule., This is the first reported structure of an MFE-2 domain. The d Delta h, Delta SCP-2L has an alpha/beta-fold consisting of five beta-strands and, five alpha-helices; the overall architecture resembles the rabbit and, human SCP-2 structures. However, the structure of d Delta h Delta SCP-2L, shows a hydrophobic tunnel that traverses the protein, which is occupied, by an ordered Triton X-100 molecule. The tunnel is large enough to, accommodate molecules such as straight-chain and branched-chain fatty, acyl-CoAs and bile acid intermediates. Large empty apolar cavities are, observed near the exit of the tunnel and between the helices C and D. In, addition, the C-terminal peroxisomal targeting signal is ordered in the, structure and solvent-exposed, which is not the case with unliganded, rabbit SCP-2, supporting the hypothesis of a ligand-assisted targeting, mechanism.
Disease
Known disease associated with this structure: D-bifunctional protein deficiency OMIM:[601860]
About this Structure
1IKT is a Single protein structure of sequence from Homo sapiens with SO4 and OXN as ligands. Active as Estradiol 17-beta-dehydrogenase, with EC number 1.1.1.62 Full crystallographic information is available from OCA.
Reference
Crystal structure of the liganded SCP-2-like domain of human peroxisomal multifunctional enzyme type 2 at 1.75 A resolution., Haapalainen AM, van Aalten DM, Merilainen G, Jalonen JE, Pirila P, Wierenga RK, Hiltunen JK, Glumoff T, J Mol Biol. 2001 Nov 9;313(5):1127-38. PMID:11700068
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