View source for 5agh


==Crystal structure of the LeuRS editing domain of Candida albicans Mutant K510A==
<StructureSection load='5agh' size='340' side='right'caption='[[5agh]], [[Resolution|resolution]] 1.81&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5agh]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Canal Canal]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5AGH OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5AGH FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5agi|5agi]], [[5agj|5agj]], [[5ah5|5ah5]]</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Leucine--tRNA_ligase Leucine--tRNA ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.1.1.4 6.1.1.4] </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=5agh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5agh OCA], [http://pdbe.org/5agh PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5agh RCSB], [http://www.ebi.ac.uk/pdbsum/5agh PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5agh ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
A new class of antimicrobial benzoxaborole compounds was identified as a potent inhibitor of leucyl-tRNA synthetase (LeuRS) and therefore of protein synthesis. In a novel mechanism, AN2690 (5-fluoro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole) blocks fungal cytoplasmic LeuRS by covalently trapping tRNALeu in the editing site of the enzyme's CP1 domain. However, some resistant mutation sites are located outside of the CP1 hydrolytic editing active site. Thus, their mode of action that undermines drug inhibition was not understood. A combination of X-ray crystallography, molecular dynamics, metadynamics, biochemical experiments, and mutational analysis of a distal benzoxaborole-resistant mutant uncovered a eukaryote-specific tyrosine "switch" that is critical to tRNA-dependent post-transfer editing. The tyrosine "switch" has three states that shift between interactions with a lysine and the 3'-hydroxyl of the tRNA terminus, to inhibit or promote post-transfer editing. The oxaborole's mechanism of action capitalizes upon one of these editing active site states. This tunable editing mechanism in eukaryotic and archaeal LeuRSs is proposed to facilitate precise quality control of aminoacylation fidelity. These mechanistic distinctions could also be capitalized upon for development of the benzoxaboroles as a broad spectrum antibacterial.

Analysis of the Resistance Mechanism of a Benzoxaborole Inhibitor Reveals Insight into the Leucyl-tRNA Synthetase Editing Mechanism.,Zhao H, Palencia A, Seiradake E, Ghaemi Z, Cusack S, Luthey-Schulten Z, Martinis S ACS Chem Biol. 2015 Jul 14. PMID:26172575<ref>PMID:26172575</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5agh" style="background-color:#fffaf0;"></div>

==See Also==
*[[Aminoacyl tRNA synthetase 3D structures|Aminoacyl tRNA synthetase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Canal]]
[[Category: Large Structures]]
[[Category: Leucine--tRNA ligase]]
[[Category: Cusack, S]]
[[Category: Ghaemi, Z]]
[[Category: Luthey-Schulten, Z]]
[[Category: Martinis, S A]]
[[Category: Palencia, A]]
[[Category: Seiradake, E]]
[[Category: Zhao, H]]
[[Category: Aminoacyl-trna synthetase]]
[[Category: Aminoacylation]]
[[Category: Antifungal target]]
[[Category: Ligase]]
[[Category: Proof-reading mechanism]]
[[Category: Protein synthesis]]