6nnh: Difference between revisions

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-'''Unreleased structure'''
-The entry 6nnh is ON HOLD
+==Structure of Closed state of Dihydrofolate reductase from Mycobacterium tuberculosis in complex with NADPH and cycloguanil==
+<StructureSection load='6nnh' size='340' side='right'caption='[[6nnh]], [[Resolution|resolution]] 1.52&Aring;' scene=''>
+== Structural highlights ==
+<table><tr><td colspan='2'>[[6nnh]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis_H37Rv Mycobacterium tuberculosis H37Rv]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6NNH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6NNH FirstGlance]. <br>
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.523&#8491;</td></tr>
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=1CY:1-(4-CHLOROPHENYL)-6,6-DIMETHYL-1,6-DIHYDRO-1,3,5-TRIAZINE-2,4-DIAMINE'>1CY</scene>, <scene name='pdbligand=CO:COBALT+(II)+ION'>CO</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=NDP:NADPH+DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE+PHOSPHATE'>NDP</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=6nnh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6nnh OCA], [https://pdbe.org/6nnh PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6nnh RCSB], [https://www.ebi.ac.uk/pdbsum/6nnh PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6nnh ProSAT]</span></td></tr>
+</table>
+== Function ==
+[https://www.uniprot.org/uniprot/DYR_MYCTU DYR_MYCTU] Key enzyme in folate metabolism. Catalyzes an essential reaction for de novo glycine and purine synthesis, and for DNA precursor synthesis.
+<div style="background-color:#fffaf0;">
+== Publication Abstract from PubMed ==
+Tuberculosis is a disease caused by Mycobacterium tuberculosis and is the leading cause of death from a single infectious pathogen, with a high prevalence in developing countries in Africa and Asia. There still is a need for the development or repurposing of novel therapies to combat this disease owing to the long-term nature of current therapies and because of the number of reported resistant strains. Here, structures of dihydrofolate reductase from M. tuberculosis (MtDHFR), which is a key target of the folate pathway, are reported in complex with four antifolates, pyrimethamine, cycloguanil, diaverdine and pemetrexed, and its substrate dihydrofolate in order to understand their binding modes. The structures of all of these complexes were obtained in the closed-conformation state of the enzyme and a fine structural analysis indicated motion in key regions of the substrate-binding site and different binding modes of the ligands. In addition, the affinities, through Kd measurement, of diaverdine and methotrexate have been determined; MtDHFR has a lower affinity (highest Kd) for diaverdine than pyrimethamine and trimethoprim, and a very high affinity for methotrexate, as expected. The structural comparisons and analysis described in this work provide new information about the plasticity of MtDHFR and the binding effects of different antifolates.
-Authors: Giudice, J.H.P., Ribeiro, J.A., Dias, M.V.B.
+Crystal structures of the closed form of Mycobacterium tuberculosis dihydrofolate reductase in complex with dihydrofolate and antifolates.,Ribeiro JA, Chavez-Pacheco SM, de Oliveira GS, Silva CDS, Giudice JHP, Libreros-Zuniga GA, Dias MVB Acta Crystallogr D Struct Biol. 2019 Jul 1;75(Pt 7):682-693. doi:, 10.1107/S205979831900901X. Epub 2019 Jul 4. PMID:31282477<ref>PMID:31282477</ref>
-Description: Structure of Closed state of Dihydrofolate reductase from Mycobacterium tuberculosis in complex with NADPH and cycloguanil
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
-[[Category: Unreleased Structures]]
+</div>
-[[Category: Giudice, J.H.P]]
+<div class="pdbe-citations 6nnh" style="background-color:#fffaf0;"></div>
-[[Category: Ribeiro, J.A]]
-[[Category: Dias, M.V.B]]
+==See Also==
+*[[Dihydrofolate reductase 3D structures|Dihydrofolate reductase 3D structures]]
+== References ==
+<references/>
+__TOC__
+</StructureSection>
+[[Category: Large Structures]]
+[[Category: Mycobacterium tuberculosis H37Rv]]
+[[Category: Dias MVB]]
+[[Category: Giudice JHP]]
+[[Category: Ribeiro JA]]