View source for 6sxj


==Crystal structure of spectinomycin adenyltransferase AAD(9) from Enterococcus faecialis==
<StructureSection load='6sxj' size='340' side='right'caption='[[6sxj]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6sxj]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Enterococcus_faecalis Enterococcus faecalis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6SXJ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6SXJ 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]] 2.1&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</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=6sxj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6sxj OCA], [https://pdbe.org/6sxj PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6sxj RCSB], [https://www.ebi.ac.uk/pdbsum/6sxj PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6sxj ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/S9AD_ENTFL S9AD_ENTFL] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Spectinomycin is a ribosome-binding antibiotic that blocks the translocation step of translation. A prevalent resistance mechanism is the modification of the drug by aminoglycoside nucleotidyl transferase (ANT) enzymes of the spectinomycin-specific ANT (9) family or by the dual-specificity ANT(3") (9) family that also acts on streptomycin. We previously reported the structural mechanism of streptomycin modification by the ANT(3") (9) AadA from Salmonella enterica ANT (9) from Enterococcus faecalis adenylates the 9-hydroxyl of spectinomycin. We here present the first structures of spectinomycin bound to an ANT enzyme. Structures were solved for ANT (9) in apo form, in complex with ATP, spectinomycin and magnesium or in complex with only spectinomycin. ANT (9) shows similar overall structure as AadA with an N-terminal nucleotidyltransferase domain and a C-terminal alpha-helical domain. Spectinomycin binds close to the entrance of the interdomain cleft, while ATP is buried at the bottom. Upon drug binding, the C-terminal domain rotates by 14 degrees to close the cleft, allowing contacts of both domains with the drug. Comparison with AadA shows that spectinomycin specificity is explained by a straight alpha5 helix and a shorter alpha5-alpha6 loop that would clash with the larger streptomycin substrate. In the active site, we observe two magnesium ions, one of them in a previously un-observed position that may activate the 9-hydroxyl for deprotonation by the catalytic base Glu-86. The observed binding mode for spectinomycin suggests that also spectinamides and aminomethyl spectinomycins, recent spectinomycin analogues with expansions in position 4 of the C ring, will be subjected to modification by ANT (9) and ANT(3") (9) enzymes.

Structural recognition of spectinomycin by resistance enzyme ANT(9) from Enterococcus faecalis.,Kanchugal P S, Selmer M Antimicrob Agents Chemother. 2020 Apr 6. pii: AAC.00371-20. doi:, 10.1128/AAC.00371-20. PMID:32253216<ref>PMID:32253216</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6sxj" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Enterococcus faecalis]]
[[Category: Large Structures]]
[[Category: Kanchugal P S]]
[[Category: Selmer M]]