1df7

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[[Image:1df7.gif|left|200px]]
[[Image:1df7.gif|left|200px]]
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{{Structure
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<!--
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|PDB= 1df7 |SIZE=350|CAPTION= <scene name='initialview01'>1df7</scene>, resolution 1.7&Aring;
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The line below this paragraph, containing "STRUCTURE_1df7", creates the "Structure Box" on the page.
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|SITE=
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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|LIGAND= <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MTX:METHOTREXATE'>MTX</scene>, <scene name='pdbligand=NDP:NADPH+DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE+PHOSPHATE'>NDP</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Dihydrofolate_reductase Dihydrofolate reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.5.1.3 1.5.1.3] </span>
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or leave the SCENE parameter empty for the default display.
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|GENE=
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-->
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|DOMAIN=
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{{STRUCTURE_1df7| PDB=1df7 | SCENE= }}
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|RELATEDENTRY=[[1dg5|1DG5]], [[1dg7|1DG7]], [[1dg8|1DG8]]
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1df7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1df7 OCA], [http://www.ebi.ac.uk/pdbsum/1df7 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1df7 RCSB]</span>
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}}
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'''DIHYDROFOLATE REDUCTASE OF MYCOBACTERIUM TUBERCULOSIS COMPLEXED WITH NADPH AND METHOTREXATE'''
'''DIHYDROFOLATE REDUCTASE OF MYCOBACTERIUM TUBERCULOSIS COMPLEXED WITH NADPH AND METHOTREXATE'''
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[[Category: Turley, S.]]
[[Category: Turley, S.]]
[[Category: Wooden, J.]]
[[Category: Wooden, J.]]
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[[Category: dihydrofolate reductase]]
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[[Category: Dihydrofolate reductase]]
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[[Category: folateanalog]]
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[[Category: Folateanalog]]
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[[Category: methotrexate]]
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[[Category: Methotrexate]]
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[[Category: nicotinamide adenine dinucleotide]]
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[[Category: Nicotinamide adenine dinucleotide]]
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[[Category: rossmann fold]]
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[[Category: Rossmann fold]]
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[[Category: structure-based inhibitor design]]
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[[Category: Structure-based inhibitor design]]
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[[Category: tuberculosis]]
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[[Category: Tuberculosis]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 13:47:00 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 19:40:27 2008''
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Revision as of 10:47, 2 May 2008

Image:1df7.gif

Template:STRUCTURE 1df7

DIHYDROFOLATE REDUCTASE OF MYCOBACTERIUM TUBERCULOSIS COMPLEXED WITH NADPH AND METHOTREXATE


Overview

Dihydrofolate reductase (DHFR) catalyzes the NADPH-dependent reduction of dihydrofolate to tetrahydrofolate and is essential for the synthesis of thymidylate, purines and several amino acids. Inhibition of the enzyme's activity leads to arrest of DNA synthesis and cell death. The enzyme has been studied extensively as a drug target for bacterial, protozoal and fungal infections, and also for neoplastic and autoimmune diseases. Here, we report the crystal structure of dihydrofolate reductase from Mycobacterium tuberculosis, a human pathogen responsible for the death of millions of human beings per year. Three crystal structures of ternary complexes of M. tuberculosis DHFR with NADP and different inhibitors have been determined, as well as the binary complex with NADP, with resolutions ranging from 1.7 to 2.0 A. The three DHFR inhibitors are the anticancer drug methotrexate, the antimicrobial trimethoprim and Br-WR99210, an analogue of the antimalarial agent WR99210. Structural comparison of these complexes with human dihydrofolate reductase indicates that the overall protein folds are similar, despite only 26 % sequence identity, but that the environments of both NADP and of the inhibitors contain interesting differences between the enzymes from host and pathogen. Specifically, residues Ala101 and Leu102 near the N6 of NADP are distinctly more hydrophobic in the M. tuberculosis than in the human enzyme. Another striking difference occurs in a region near atoms N1 and N8 of methotrexate, which is also near atom N1 of trimethoprim, and near the N1 and two methyl groups of Br-WR99210. A glycerol molecule binds here in a pocket of the M. tuberculosis DHFR:MTX complex, while this pocket is essentially filled with hydrophobic side-chains in the human enzyme. These differences between the enzymes from pathogen and host provide opportunities for designing new selective inhibitors of M. tuberculosis DHFR.

About this Structure

1DF7 is a Single protein structure of sequence from Mycobacterium tuberculosis. Full crystallographic information is available from OCA.

Reference

Three-dimensional structure of M. tuberculosis dihydrofolate reductase reveals opportunities for the design of novel tuberculosis drugs., Li R, Sirawaraporn R, Chitnumsub P, Sirawaraporn W, Wooden J, Athappilly F, Turley S, Hol WG, J Mol Biol. 2000 Jan 14;295(2):307-23. PMID:10623528 Page seeded by OCA on Fri May 2 13:47:00 2008

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