1ak5
From Proteopedia
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| - | | | + | {{STRUCTURE_1ak5| PDB=1ak5 | SCENE= }} |
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'''INOSINE MONOPHOSPHATE DEHYDROGENASE (IMPDH) FROM TRITRICHOMONAS FOETUS''' | '''INOSINE MONOPHOSPHATE DEHYDROGENASE (IMPDH) FROM TRITRICHOMONAS FOETUS''' | ||
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[[Category: Tritrichomonas foetus]] | [[Category: Tritrichomonas foetus]] | ||
[[Category: Whitby, F G.]] | [[Category: Whitby, F G.]] | ||
| - | [[Category: | + | [[Category: Alpha-8-beta-8 barrel]] |
| - | [[Category: | + | [[Category: C4-tetramer]] |
| - | [[Category: | + | [[Category: Dehydrogenase]] |
| - | [[Category: | + | [[Category: Oxidoreductase]] |
| - | [[Category: | + | [[Category: Purine metabolism]] |
| - | [[Category: | + | [[Category: Tetramer]] |
| - | [[Category: | + | [[Category: Tim barrel]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 10:22:29 2008'' | |
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Revision as of 07:22, 2 May 2008
INOSINE MONOPHOSPHATE DEHYDROGENASE (IMPDH) FROM TRITRICHOMONAS FOETUS
Overview
Inosine-5'-monophosphate dehydrogenase (IMPDH) is an attractive drug target for the control of parasitic infections. The enzyme catalyzes the oxidation of inosine monophosphate (IMP) to xanthosine monophosphate (XMP), the committed step in de novo guanosine monophosphate (GMP) biosynthesis. We have determined the crystal structures of IMPDH from the protozoan parasite Tritrichomonas foetus in the apo form at 2.3 A resolution and the enzyme-XMP complex at 2.6 A resolution. Each monomer of this tetrameric enzyme is comprised of two domains, the largest of which includes an eight-stranded parallel beta/alpha-barrel that contains the enzyme active site at the C termini of the barrel beta-strands. A second domain, comprised of residues 102-220, is disordered in the crystal. IMPDH is expected to be active as a tetramer, since the active site cavity is formed by strands from adjacent subunits. An intrasubunit disulfide bond, seen in the crystal structure, may stabilize the protein in a less active form, as high concentrations of reducing agent have been shown to increase enzyme activity. Disorder at the active site suggests that a high degree of flexibility may be inherent in the catalytic function of IMPDH. Unlike IMPDH from other species, the T. foetus enzyme has a single arginine that is largely responsible for coordinating the substrate phosphate in the active site. This structural uniqueness may facilitate structure-based identification and design of compounds that specifically inhibit the parasite enzyme.
About this Structure
1AK5 is a Single protein structure of sequence from Tritrichomonas foetus. Full crystallographic information is available from OCA.
Reference
Crystal structure of Tritrichomonas foetus inosine-5'-monophosphate dehydrogenase and the enzyme-product complex., Whitby FG, Luecke H, Kuhn P, Somoza JR, Huete-Perez JA, Phillips JD, Hill CP, Fletterick RJ, Wang CC, Biochemistry. 1997 Sep 2;36(35):10666-74. PMID:9271497 Page seeded by OCA on Fri May 2 10:22:29 2008
