2ztk: Difference between revisions
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==Crystal structure of homocitrate synthase from Thermus thermophilus complexed with homocitrate== | ==Crystal structure of homocitrate synthase from Thermus thermophilus complexed with homocitrate== | ||
<StructureSection load='2ztk' size='340' side='right' caption='[[2ztk]], [[Resolution|resolution]] 1.96Å' scene=''> | <StructureSection load='2ztk' size='340' side='right' caption='[[2ztk]], [[Resolution|resolution]] 1.96Å' scene=''> | ||
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">hcs ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=262724 THET2])</td></tr> | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">hcs ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=262724 THET2])</td></tr> | ||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Homocitrate_synthase Homocitrate synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.3.3.14 2.3.3.14] </span></td></tr> | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Homocitrate_synthase Homocitrate synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.3.3.14 2.3.3.14] </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=2ztk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ztk OCA], [http://pdbe.org/2ztk PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2ztk RCSB], [http://www.ebi.ac.uk/pdbsum/2ztk 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=2ztk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ztk OCA], [http://pdbe.org/2ztk PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2ztk RCSB], [http://www.ebi.ac.uk/pdbsum/2ztk PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2ztk ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
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Check<jmol> | Check<jmol> | ||
<jmolCheckbox> | <jmolCheckbox> | ||
<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/zt/2ztk_consurf.spt"</scriptWhenChecked> | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/zt/2ztk_consurf.spt"</scriptWhenChecked> | ||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | ||
<text>to colour the structure by Evolutionary Conservation</text> | <text>to colour the structure by Evolutionary Conservation</text> | ||
Revision as of 10:15, 18 October 2018
Crystal structure of homocitrate synthase from Thermus thermophilus complexed with homocitrateCrystal structure of homocitrate synthase from Thermus thermophilus complexed with homocitrate
Structural highlights
Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedHomocitrate synthase (HCS) catalyzes aldol-type condensation of acetyl coenzyme A (acetyl-CoA) and alpha-ketoglutarate (alpha-KG) to synthesize homocitrate (HC), which is the first and committed step in the lysine biosynthetic pathway through alpha-aminoadipate. As known in most enzymes catalyzing the first reactions in amino acid biosynthetic pathways, HCS is regulated via feedback inhibition by the end product, lysine. Here, we determined the crystal structures of HCS from Thermus thermophilus complexed with alpha-KG, HC, or lysine. In the HC complex, the C1-carboxyl group of HC, which is derived from acetyl-CoA, is hydrogen-bonded with His-292* from another subunit (indicated by the asterisk), indicating direct involvement of this residue in the catalytic mechanism of HCS. The crystal structure of HCS complexed with lysine showed that lysine is bound to the active site with rearrangement of amino acid residues in the substrate-binding site, which accounts for the competitive inhibition by lysine with alpha-KG. Comparison between the structures suggests that His-72, which is conserved in lysine-sensitive HCSs and binds the C5-carboxyl group of alpha-KG, serves as a switch for the conformational change. Replacement of His-72 by leucine made HCS resistant to lysine inhibition, demonstrating the regulatory role of this conserved residue. Mechanism of substrate recognition and insight into feedback inhibition of homocitrate synthase from Thermus thermophilus.,Okada T, Tomita T, Wulandari AP, Kuzuyama T, Nishiyama M J Biol Chem. 2010 Feb 5;285(6):4195-205. Epub 2009 Dec 7. PMID:19996101[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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