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3mi3
From Proteopedia
(Difference between revisions)
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| - | [[ | + | ==Homocitrate Synthase Lys4 bound to Lysine== |
| + | <StructureSection load='3mi3' size='340' side='right' caption='[[3mi3]], [[Resolution|resolution]] 2.38Å' scene=''> | ||
| + | == Structural highlights == | ||
| + | <table><tr><td colspan='2'>[[3mi3]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Schizosaccharomyces_pombe Schizosaccharomyces pombe]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=3l90 3l90]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3MI3 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3MI3 FirstGlance]. <br> | ||
| + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=LYS:LYSINE'>LYS</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> | ||
| + | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3ivs|3ivs]], [[3ivt|3ivt]], [[3ivu|3ivu]]</td></tr> | ||
| + | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">lys4, SPBC1105.02c ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4896 Schizosaccharomyces pombe])</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=3mi3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3mi3 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3mi3 RCSB], [http://www.ebi.ac.uk/pdbsum/3mi3 PDBsum]</span></td></tr> | ||
| + | </table> | ||
| + | == Evolutionary Conservation == | ||
| + | [[Image:Consurf_key_small.gif|200px|right]] | ||
| + | Check<jmol> | ||
| + | <jmolCheckbox> | ||
| + | <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/mi/3mi3_consurf.spt"</scriptWhenChecked> | ||
| + | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | ||
| + | <text>to colour the structure by Evolutionary Conservation</text> | ||
| + | </jmolCheckbox> | ||
| + | </jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/chain_selection.php?pdb_ID=2ata ConSurf]. | ||
| + | <div style="clear:both"></div> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | The alpha-aminoadipate pathway of lysine biosynthesis is modulated at the transcriptional and biochemical levels by feedback inhibition. The first enzyme in the alpha-aminoadipate pathway, homocitrate synthase (HCS), is the target of the feedback regulation and is strongly inhibited by l-lysine. Here we report the structure of Schizosaccharomyces pombe HCS (SpHCS) in complex with l-lysine. The structure illustrates that the amino acid directly competes with the substrate 2-oxoglutarate for binding within the active site of HCS. Differential recognition of the substrate and inhibitor is achieved via a switch position within the (alpha/beta)(8) TIM barrel of the enzyme that can distinguish between the C5-carboxylate group of 2-oxoglutarate and the epsilon-ammonium group of l-lysine. In vitro and in vivo assays demonstrate that mutations of the switch residues, which interact with the l-lysine epsilon-ammonium group, abrogate feedback inhibition, as do substitutions of residues within the C-terminal domain that were identified in a previous study of l-lysine-insensitive HCS mutants in Saccharomyces cerevisiae. Together, these results yield new insights into the mechanism of feedback regulation of an enzyme central to lysine biosynthesis. | ||
| - | + | Structural basis for L-lysine feedback inhibition of homocitrate synthase.,Bulfer SL, Scott EM, Pillus L, Trievel RC J Biol Chem. 2010 Apr 2;285(14):10446-53. Epub 2010 Jan 19. PMID:20089861<ref>PMID:20089861</ref> | |
| - | + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |
| - | + | </div> | |
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==See Also== | ==See Also== | ||
*[[Homocitrate synthase|Homocitrate synthase]] | *[[Homocitrate synthase|Homocitrate synthase]] | ||
| - | + | == References == | |
| - | == | + | <references/> |
| - | < | + | __TOC__ |
| + | </StructureSection> | ||
[[Category: Homocitrate synthase]] | [[Category: Homocitrate synthase]] | ||
[[Category: Schizosaccharomyces pombe]] | [[Category: Schizosaccharomyces pombe]] | ||
| - | [[Category: Bulfer, S L | + | [[Category: Bulfer, S L]] |
| - | [[Category: Pillus, L | + | [[Category: Pillus, L]] |
| - | [[Category: Scott, E M | + | [[Category: Scott, E M]] |
| - | [[Category: Trievel, R C | + | [[Category: Trievel, R C]] |
[[Category: Amino-acid biosynthesis]] | [[Category: Amino-acid biosynthesis]] | ||
[[Category: Claisen condensation]] | [[Category: Claisen condensation]] | ||
Revision as of 09:40, 9 December 2014
Homocitrate Synthase Lys4 bound to Lysine
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