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6uqn
From Proteopedia
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| - | '''Unreleased structure''' | ||
| - | + | ==Crystal structure of R173A variant of cytosolic fumarate hydratase from Leishmania major in a complex with fumarate and S-malate== | |
| + | <StructureSection load='6uqn' size='340' side='right'caption='[[6uqn]], [[Resolution|resolution]] 3.30Å' scene=''> | ||
| + | == Structural highlights == | ||
| + | <table><tr><td colspan='2'>[[6uqn]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6UQN OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6UQN FirstGlance]. <br> | ||
| + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=FUM:FUMARIC+ACID'>FUM</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=LMR:(2S)-2-HYDROXYBUTANEDIOIC+ACID'>LMR</scene>, <scene name='pdbligand=SF4:IRON/SULFUR+CLUSTER'>SF4</scene></td></tr> | ||
| + | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[6unz|6unz]], [[6uo0|6uo0]], [[6uoi|6uoi]], [[6uoj|6uoj]], [[6up9|6up9]], [[6upm|6upm]], [[6upo|6upo]], [[6uq8|6uq8]], [[6uq9|6uq9]], [[6uqb|6uqb]], [[6uql|6uql]], [[6uqm|6uqm]]</td></tr> | ||
| + | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Fumarate_hydratase Fumarate hydratase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.1.2 4.2.1.2] </span></td></tr> | ||
| + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6uqn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6uqn OCA], [http://pdbe.org/6uqn PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6uqn RCSB], [http://www.ebi.ac.uk/pdbsum/6uqn PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6uqn ProSAT]</span></td></tr> | ||
| + | </table> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Class I fumarate hydratases (FHs) are central metabolic enzymes that use a [4Fe-4S] cluster to catalyze the reversible conversion of fumarate to S-malate. The parasite Leishmania major, which is responsible for leishmaniasis, expresses two class I FH isoforms: mitochondrial LmFH-1 and cytosolic LmFH-2. In this study, we present kinetic characterizations of both LmFH isoforms, present 13 crystal structures of LmFH-2 variants, and employ site-directed mutagenesis to investigate the enzyme's mechanism. Our kinetic data confirm that both LmFH-1 and LmFH-2 are susceptible to oxygen-dependent inhibition, with data from crystallography and electron paramagnetic resonance spectroscopy showing that oxygen exposure converts an active [4Fe-4S] cluster to an inactive [3Fe-4S] cluster. Our anaerobically conducted kinetic studies reveal a preference for fumarate over S-malate. Our data further reveal that single alanine substitutions of T467, R421, R471, D135, and H334 decrease kcat values 9-16000-fold without substantially affecting Km values, suggesting that these residues function in catalytic roles. Crystal structures of LmFH-2 variants are consistent with this idea, showing similar bidentate binding to the unique iron of the [4Fe-4S] cluster for substrate S-malate as observed in wild type FH. We further present LmFH-2 structures with substrate fumarate and weak inhibitors succinate and malonate bound in the active site and the first structure of an LmFH that is substrate-free and inhibitor-free, the latter showing increased mobility in the C-terminal domain. Collectively, these data provide insight into the molecular basis for the reaction catalyzed by LmFHs, enzymes that are potential drug targets against leishmaniasis. | ||
| - | + | Structural and Biochemical Investigations of the [4Fe-4S] Cluster-Containing Fumarate Hydratase from Leishmania major.,Feliciano PR, Drennan CL Biochemistry. 2019 Nov 27. doi: 10.1021/acs.biochem.9b00923. PMID:31743022<ref>PMID:31743022</ref> | |
| - | + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |
| - | [[Category: | + | </div> |
| + | <div class="pdbe-citations 6uqn" style="background-color:#fffaf0;"></div> | ||
| + | == References == | ||
| + | <references/> | ||
| + | __TOC__ | ||
| + | </StructureSection> | ||
| + | [[Category: Fumarate hydratase]] | ||
| + | [[Category: Large Structures]] | ||
| + | [[Category: Drennan, C L]] | ||
| + | [[Category: Feliciano, P R]] | ||
| + | [[Category: Fumarase]] | ||
| + | [[Category: Fumarate]] | ||
| + | [[Category: Leishmania major]] | ||
| + | [[Category: Lyase]] | ||
| + | [[Category: S-malate]] | ||
| + | [[Category: Substrate]] | ||
| + | [[Category: Variant r173a]] | ||
Revision as of 08:27, 4 December 2019
Crystal structure of R173A variant of cytosolic fumarate hydratase from Leishmania major in a complex with fumarate and S-malate
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