View source for 4myo


==Crystal structure of streptogramin group A antibiotic acetyltransferase VatA from Staphylococcus aureus==
<StructureSection load='4myo' size='340' side='right'caption='[[4myo]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4myo]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Staphylococcus_aureus Staphylococcus aureus]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=4e8l 4e8l]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4MYO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4MYO 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]] 2.696&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=4myo FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4myo OCA], [https://pdbe.org/4myo PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4myo RCSB], [https://www.ebi.ac.uk/pdbsum/4myo PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4myo ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/VATA_STAAU VATA_STAAU] Inactivates the A compounds of virginiamycin-like antibiotics, thus providing resistance to these antibiotics.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Combinations of streptogramins of group A and B (i.e. dalfoprisin and quinipristin) are "last-resort" antibiotics for treatment of infections caused by Gram-positive pathogens including methicillin-resistant Staphylococcus aureus and vancomycin-resistant Enterococcus faecium. Resistance to streptogramins has arisen via multiple mechanisms, including deactivation of the group A component by the large family of virginamycin O-acetyltransferase (Vat) enzymes. Despite the structural elucidation performed for the VatD acetyltransferase which provided a general molecular framework for activity, detailed characterization of the essential catalytic and antibiotic substrate-binding determinants in Vat enzymes is still lacking. We have determined the crystal structure of S. aureus VatA in apo, virginiamycin M1- and acetyl CoA-bound forms and provide an extensive mutagenesis and functional analysis of the structural determinants required for catalysis and streptogramin A recognition. Based on an updated genomic survey across the Vat enzyme family we identified key conserved residues critical for VatA activity that are not part of the O-acetylation catalytic apparatus. Exploiting such constraints of the Vat active site may lead to development of streptogramin A compounds that evade inactivation by Vat enzymes while retaining binding to their ribosomal target.

Potential for reduction of streptogramin A resistance revealed by structural analysis of the VatA acetyltransferase.,Stogios PJ, Kuhn ML, Evdokimova E, Courvalin P, Anderson WF, Savchenko A Antimicrob Agents Chemother. 2014 Sep 15. pii: AAC.03743-14. PMID:25223995<ref>PMID:25223995</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4myo" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Staphylococcus aureus]]
[[Category: Anderson WF]]
[[Category: Courvalin P]]
[[Category: Di Leo R]]
[[Category: Dong A]]
[[Category: Evdokimova E]]
[[Category: Krishnamoorthy M]]
[[Category: Minasov G]]
[[Category: Savchenko A]]
[[Category: Stogios PJ]]
[[Category: Yim V]]