View source for 6kct


==Crystal structure of plasmodium lysyl-tRNA synthetase in complex with a cladosporin derivative 5==
<StructureSection load='6kct' size='340' side='right'caption='[[6kct]], [[Resolution|resolution]] 3.25&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6kct]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Plasmodium_falciparum_NF54 Plasmodium falciparum NF54]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6KCT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6KCT 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]] 3.25&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=D5O:3-(cyclohexylmethyl)-6,8-bis(oxidanyl)isochromen-1-one'>D5O</scene>, <scene name='pdbligand=LYS:LYSINE'>LYS</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=6kct FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6kct OCA], [https://pdbe.org/6kct PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6kct RCSB], [https://www.ebi.ac.uk/pdbsum/6kct PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6kct ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/W7JP72_PLAFO W7JP72_PLAFO] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Aminoacyl-tRNA synthetases, the essential enzyme family for protein translation, are attractive targets for developing antibacterial, antifungal, and antiparasitic agents and for treating other human diseases. The antimalarial natural product cladosporin was discovered recently as a novel lysyl-tRNA synthetase (LysRS) specific inhibitor. Here, we report a thorough analysis of cladosporin derivatives using chemical synthesis, biophysical, and biochemical experiments. A series of isocoumarin derivatives with only one nonhydrogen atom/bond change per compound was synthesized. These changes include replacements of methyltetrahydropyran moiety by methylcyclohexane or cyclohexane, lactone by lactam, hydroxyl groups by methoxyl groups, and dismission of the chiral center at C3 with a Delta(3,4) double bond. We evaluated these compounds by thermal shift assays and enzymatic experiments and further studied their molecular recognition by the Plasmodium falciparum LysRS through total five high-resolution crystal structures. Our results showed that the methyltetrahydropyran moiety of cladosporin could be replaced by a more stable methylcyclohexane without reducing binding ability. Removing the methyl group from the methylcyclohexane moiety slightly decreased the interaction with LysRS. Besides, the replacement with a lactam group or a conjugated Delta(3,4) double bond within the scaffold could be two more options to optimize the compound. Lastly, the two phenolic hydroxyl groups were critical for the compounds to bind LysRS. The detailed analyses at atomic resolution in this study provide a foundation for the further development of new antibiotics from cladosporin derivatives.

Atomic Resolution Analyses of Isocoumarin Derivatives for Inhibition of Lysyl-tRNA Synthetase.,Zhou J, Zheng L, Hei Z, Li W, Wang J, Yu B, Fang P ACS Chem Biol. 2020 Mar 26. doi: 10.1021/acschembio.0c00032. PMID:32195573<ref>PMID:32195573</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6kct" style="background-color:#fffaf0;"></div>

==See Also==
*[[Aminoacyl tRNA synthetase 3D structures|Aminoacyl tRNA synthetase 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Plasmodium falciparum NF54]]
[[Category: Fang P]]
[[Category: Zhou J]]