4l6h: Difference between revisions
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==Crystal structure of the Candida albicans Methionine Synthase in complex with Methotrexate and Homocysteine== | ==Crystal structure of the Candida albicans Methionine Synthase in complex with Methotrexate and Homocysteine== | ||
<StructureSection load='4l6h' size='340' side='right' caption='[[4l6h]], [[Resolution|resolution]] 1.75Å' scene=''> | <StructureSection load='4l6h' size='340' side='right' caption='[[4l6h]], [[Resolution|resolution]] 1.75Å' scene=''> | ||
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CaO19.10083, CaO19.2551, MET6 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=237561 CANAL])</td></tr> | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CaO19.10083, CaO19.2551, MET6 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=237561 CANAL])</td></tr> | ||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/5-methyltetrahydropteroyltriglutamate--homocysteine_S-methyltransferase 5-methyltetrahydropteroyltriglutamate--homocysteine S-methyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.1.14 2.1.1.14] </span></td></tr> | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/5-methyltetrahydropteroyltriglutamate--homocysteine_S-methyltransferase 5-methyltetrahydropteroyltriglutamate--homocysteine S-methyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.1.14 2.1.1.14] </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=4l6h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4l6h OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4l6h RCSB], [http://www.ebi.ac.uk/pdbsum/4l6h PDBsum]</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=4l6h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4l6h OCA], [http://pdbe.org/4l6h PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4l6h RCSB], [http://www.ebi.ac.uk/pdbsum/4l6h PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4l6h ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Function == | == Function == | ||
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | </div> | ||
<div class="pdbe-citations 4l6h" style="background-color:#fffaf0;"></div> | |||
== References == | == References == | ||
<references/> | <references/> | ||
Revision as of 21:11, 4 August 2016
Crystal structure of the Candida albicans Methionine Synthase in complex with Methotrexate and HomocysteineCrystal structure of the Candida albicans Methionine Synthase in complex with Methotrexate and Homocysteine
Structural highlights
Function[METE_CANAL] Catalyzes the transfer of a methyl group from 5-methyltetrahydrofolate to homocysteine resulting in methionine formation.[HAMAP-Rule:MF_00172] Publication Abstract from PubMedThe cobalamin-independent methionine synthase from Candida albicans, known as Met6p, is a 90-kDa enzyme that consists of two (betaalpha)8 barrels. The active site is located between the two domains and has binding sites for a zinc ion and substrates l-homocysteine and 5-methyl-tetrahydrofolate-glutamate3. Met6p catalyzes transfer of the methyl group of 5-methyl-tetrahydrofolate-glutamate3 to the l-homocysteine thiolate to generate methionine. Met6p is essential for fungal growth, and we currently pursue it as an antifungal drug design target. Here we report the binding of l-homocysteine, methionine, and several folate analogs. We show that binding of l-homocysteine or methionine results in conformational rearrangements at the amino acid binding pocket, moving the catalytic zinc into position to activate the thiol group. We also map the folate binding pocket and identify specific binding residues, like Asn126, whose mutation eliminates catalytic activity. We also report the development of a robust fluorescence-based activity assay suitable for high-throughput screening. We use this assay and an X-ray structure to characterize methotrexate as a weak inhibitor of fungal Met6p. Structural analysis of a fungal methionine synthase with substrates and inhibitors.,Ubhi D, Kago G, Monzingo AF, Robertus JD J Mol Biol. 2014 Apr 17;426(8):1839-47. doi: 10.1016/j.jmb.2014.02.006. Epub 2014, Feb 11. PMID:24524835[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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