View source for 4b7n


==H1N1 2009 Pandemic Influenza Virus: Resistance of the I223R Neuraminidase Mutant Explained by Kinetic and Structural Analysis==
<StructureSection load='4b7n' size='340' side='right'caption='[[4b7n]], [[Resolution|resolution]] 2.84&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4b7n]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Influenza_A_virus_(A/Netherlands/2631_1202/2010(H1N1)) Influenza A virus (A/Netherlands/2631_1202/2010(H1N1))]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4B7N OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4B7N 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]] 2.84&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=ZMR:ZANAMIVIR'>ZMR</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=4b7n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4b7n OCA], [https://pdbe.org/4b7n PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4b7n RCSB], [https://www.ebi.ac.uk/pdbsum/4b7n PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4b7n ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/F8UU09_9INFA F8UU09_9INFA] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Two classes of antiviral drugs, neuraminidase inhibitors and adamantanes, are approved for prophylaxis and therapy against influenza virus infections. A major concern is that antiviral resistant viruses emerge and spread in the human population. The 2009 pandemic H1N1 virus is already resistant to adamantanes. Recently, a novel neuraminidase inhibitor resistance mutation I223R was identified in the neuraminidase of this subtype. To understand the resistance mechanism of this mutation, the enzymatic properties of the I223R mutant, together with the most frequently observed resistance mutation, H275Y, and the double mutant I223R/H275Y were compared. Relative to wild type, K(M) values for MUNANA increased only 2-fold for the single I223R mutant and up to 8-fold for the double mutant. Oseltamivir inhibition constants (K(I)) increased 48-fold in the single I223R mutant and 7500-fold in the double mutant. In both cases the change was largely accounted for by an increased dissociation rate constant for oseltamivir, but the inhibition constants for zanamivir were less increased. We have used X-ray crystallography to better understand the effect of mutation I223R on drug binding. We find that there is shrinkage of a hydrophobic pocket in the active site as a result of the I223R change. Furthermore, R223 interacts with S247 which changes the rotamer it adopts and, consequently, binding of the pentoxyl substituent of oseltamivir is not as favorable as in the wild type. However, the polar glycerol substituent present in zanamivir, which mimics the natural substrate, is accommodated in the I223R mutant structure in a similar way to wild type, thus explaining the kinetic data. Our structural data also show that, in contrast to a recently reported structure, the active site of 2009 pandemic neuraminidase can adopt an open conformation.

H1N1 2009 Pandemic Influenza Virus: Resistance of the I223R Neuraminidase Mutant Explained by Kinetic and Structural Analysis.,van der Vries E, Collins PJ, Vachieri SG, Xiong X, Liu J, Walker PA, Haire LF, Hay AJ, Schutten M, Osterhaus AD, Martin SR, Boucher CA, Skehel JJ, Gamblin SJ PLoS Pathog. 2012 Sep;8(9):e1002914. doi: 10.1371/journal.ppat.1002914. Epub 2012, Sep 20. PMID:23028314<ref>PMID:23028314</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4b7n" style="background-color:#fffaf0;"></div>

==See Also==
*[[Neuraminidase 3D structures|Neuraminidase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Boucher CAB]]
[[Category: Collins PJ]]
[[Category: Gamblin SJ]]
[[Category: Haire LF]]
[[Category: Hay AJ]]
[[Category: Liu J]]
[[Category: Martin SR]]
[[Category: Osterhaus ADME]]
[[Category: Schutten M]]
[[Category: Skehel JJ]]
[[Category: Vachieri SG]]
[[Category: Walker PA]]
[[Category: Xiong X]]
[[Category: Van der Vries E]]