4c6x: Difference between revisions
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==Crystal structure of M. tuberculosis C171Q KasA in complex with thiolactomycin (TLM)== | |||
<StructureSection load='4c6x' size='340' side='right' caption='[[4c6x]], [[Resolution|resolution]] 1.95Å' scene=''> | |||
{ | == Structural highlights == | ||
<table><tr><td colspan='2'>[[4c6x]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Mycobacterium_sp._h37rv Mycobacterium sp. h37rv]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4C6X OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4C6X FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=EPE:4-(2-HYDROXYETHYL)-1-PIPERAZINE+ETHANESULFONIC+ACID'>EPE</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=M7U:(2R)-2-(HEXADECANOYLOXY)-3-{[(10R)-10-METHYLOCTADECANOYL]OXY}PROPYL+PHOSPHATE'>M7U</scene>, <scene name='pdbligand=TLM:THIOLACTOMYCIN'>TLM</scene></td></tr> | |||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4c6u|4c6u]], [[4c6v|4c6v]], [[4c6w|4c6w]], [[4c6z|4c6z]], [[4c70|4c70]], [[4c71|4c71]], [[4c72|4c72]], [[4c73|4c73]]</td></tr> | |||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Beta-ketoacyl-[acyl-carrier-protein]_synthase_I Beta-ketoacyl-[acyl-carrier-protein] synthase I], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.3.1.41 2.3.1.41] </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=4c6x FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4c6x OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4c6x RCSB], [http://www.ebi.ac.uk/pdbsum/4c6x PDBsum]</span></td></tr> | |||
</table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The survival of Mycobacterium tuberculosis depends on mycolic acids - very long alpha-alkyl-beta-hydroxy fatty acids comprising 60 to 90 carbon atoms. However, despite considerable efforts, little is known about how enzymes involved in mycolic acid biosynthesis recognize and bind their hydrophobic fatty acyl substrates. The condensing enzyme KasA is pivotal for the synthesis of very long (C38-42) fatty acids, the precursors of mycolic acids. To probe the mechanism of substrate and inhibitor recognition by KasA, we determined the structure of this protein in complex with a mycobacterial phospholipid, and with several thiolactomycin derivatives that were designed as substrate analogs. Our structures provide consecutive snapshots along the reaction coordinate for the enzyme-catalyzed reaction, and support an induced-fit mechanism in which a wide cavity is established through the concerted opening of three gatekeeping residues and several alpha-helices. The stepwise characterization of the binding process provides mechanistic insights into the induced-fit recognition in this system and serves as an excellent foundation for the development of high affinity KasA inhibitors. | |||
Structural Basis for the Recognition of Mycolic Acid Precursors by KasA, a Condensing Enzyme and Drug Target from Mycobacterium Tuberculosis.,Schiebel J, Kapilashrami K, Fekete A, Bommineni GR, Schaefer CM, Mueller MJ, Tonge PJ, Kisker C J Biol Chem. 2013 Oct 9. PMID:24108128<ref>PMID:24108128</ref> | |||
== | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Mycobacterium sp. h37rv]] | [[Category: Mycobacterium sp. h37rv]] | ||
[[Category: Bommineni, G R | [[Category: Bommineni, G R]] | ||
[[Category: Fekete, A | [[Category: Fekete, A]] | ||
[[Category: Kapilashrami, K | [[Category: Kapilashrami, K]] | ||
[[Category: Kisker, C | [[Category: Kisker, C]] | ||
[[Category: Mueller, M J | [[Category: Mueller, M J]] | ||
[[Category: Schaefer, C M | [[Category: Schaefer, C M]] | ||
[[Category: Schiebel, J | [[Category: Schiebel, J]] | ||
[[Category: Tonge, P J | [[Category: Tonge, P J]] | ||
[[Category: Condensing enzyme]] | [[Category: Condensing enzyme]] | ||
[[Category: Kas enzyme]] | [[Category: Kas enzyme]] | ||