View source for 9c4p


==Crystal structure of wild-type arabidopsis thaliana acetohydroxyacid synthase in complex with commercial herbicide triasulfuron==
<StructureSection load='9c4p' size='340' side='right'caption='[[9c4p]], [[Resolution|resolution]] 2.40&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9c4p]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Arabidopsis_thaliana Arabidopsis thaliana]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9C4P OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9C4P FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.4&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=A1AUE:2-(2-chloroethoxy)-N-[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)carbamoyl]benzene-1-sulfonamide'>A1AUE</scene>, <scene name='pdbligand=AUJ:2-[3-[(4-azanyl-2-methyl-pyrimidin-5-yl)methyl]-2-[(1S)-1-(dioxidanyl)-1-oxidanyl-ethyl]-4-methyl-1,3-thiazol-5-yl]ethyl+phosphono+hydrogen+phosphate'>AUJ</scene>, <scene name='pdbligand=CSD:3-SULFINOALANINE'>CSD</scene>, <scene name='pdbligand=FAD:FLAVIN-ADENINE+DINUCLEOTIDE'>FAD</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NHE:2-[N-CYCLOHEXYLAMINO]ETHANE+SULFONIC+ACID'>NHE</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=SRT:S,R+MESO-TARTARIC+ACID'>SRT</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=9c4p FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9c4p OCA], [https://pdbe.org/9c4p PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9c4p RCSB], [https://www.ebi.ac.uk/pdbsum/9c4p PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9c4p ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ILVB_ARATH ILVB_ARATH] Catalyzes the formation of acetolactate from pyruvate, the first step in valine and isoleucine biosynthesis.<ref>PMID:16665813</ref> <ref>PMID:2336405</ref> [:]<ref>PMID:16667374</ref> <ref>PMID:16668488</ref> <ref>PMID:8913312</ref> <ref>PMID:9355748</ref> <ref>PMID:9677339</ref> <ref>PMID:10386618</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Triasulfuron is a commercial herbicide of the sulfonylurea family. This compound targets acetohydroxyacid synthase (AHAS, E.C. 2.2.1.6), the first enzyme in the branched chain amino acid biosynthesis pathway. Here, we have determined crystal structures of Arabidopsis thaliana AHAS (AtAHAS) in complex with triasulfuron and two newly designed herbicidal compounds, identified as FMO and CMO, showing that their binding modes are subtly different. Kinetic studies showed all three compounds exhibit varying K(i) values, 0.192 +/- 0.013 muM for triasulfuron, 0.086 +/- 0.013 muM for FMO, and 1.448 +/- 0.058 muM for CMO, but all are strong time-dependent accumulative inhibitors of AtAHAS. Apart from triasulfuron being a powerful herbicide with application rates of 10-15 g/ha in wheat fields, CMO and FMO are also herbicidal at 7.5-30 g/ha for barnyard grass. This study emphasizes that accumulative inhibition is an important factor that contributes to herbicidal activity.

Crystal Structures of Arabidopsis thaliana Acetohydroxyacid Synthase in Complex with the Herbicide Triasulfuron and Two Analogues with Herbicidal Activity in Field Trials.,Cheng Y, Wang Y, Lonhienne T, Wang JG, Guddat LW J Agric Food Chem. 2024 Oct 7. doi: 10.1021/acs.jafc.4c04990. PMID:39373624<ref>PMID:39373624</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 9c4p" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Arabidopsis thaliana]]
[[Category: Large Structures]]
[[Category: Cheng Y]]
[[Category: Guddat LW]]