View source for 3ckz

==N1 Neuraminidase H274Y + Zanamivir==
<StructureSection load='3ckz' size='340' side='right' caption='[[3ckz]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3ckz]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Influenza_a_virus Influenza a virus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3CKZ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3CKZ FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=ZMR:ZANAMIVIR'>ZMR</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3cl0|3cl0]], [[3cl2|3cl2]]</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Exo-alpha-sialidase Exo-alpha-sialidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.18 3.2.1.18] </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=3ckz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3ckz OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3ckz RCSB], [http://www.ebi.ac.uk/pdbsum/3ckz PDBsum]</span></td></tr>
</table>
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ck/3ckz_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/chain_selection.php?pdb_ID=2ata ConSurf].
<div style="clear:both"></div>
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== Publication Abstract from PubMed ==
The potential impact of pandemic influenza makes effective measures to limit the spread and morbidity of virus infection a public health priority. Antiviral drugs are seen as essential requirements for control of initial influenza outbreaks caused by a new virus, and in pre-pandemic plans there is a heavy reliance on drug stockpiles. The principal target for these drugs is a virus surface glycoprotein, neuraminidase, which facilitates the release of nascent virus and thus the spread of infection. Oseltamivir (Tamiflu) and zanamivir (Relenza) are two currently used neuraminidase inhibitors that were developed using knowledge of the enzyme structure. It has been proposed that the closer such inhibitors resemble the natural substrate, the less likely they are to select drug-resistant mutant viruses that retain viability. However, there have been reports of drug-resistant mutant selection in vitro and from infected humans. We report here the enzymatic properties and crystal structures of neuraminidase mutants from H5N1-infected patients that explain the molecular basis of resistance. Our results show that these mutants are resistant to oseltamivir but still strongly inhibited by zanamivir owing to an altered hydrophobic pocket in the active site of the enzyme required for oseltamivir binding. Together with recent reports of the viability and pathogenesis of H5N1 (ref. 7) and H1N1 (ref. 8) viruses with neuraminidases carrying these mutations, our results indicate that it would be prudent for pandemic stockpiles of oseltamivir to be augmented by additional antiviral drugs, including zanamivir.

Crystal structures of oseltamivir-resistant influenza virus neuraminidase mutants.,Collins PJ, Haire LF, Lin YP, Liu J, Russell RJ, Walker PA, Skehel JJ, Martin SR, Hay AJ, Gamblin SJ Nature. 2008 Jun 26;453(7199):1258-61. Epub 2008 May 14. PMID:18480754<ref>PMID:18480754</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Avian Influenza Neuraminidase%2C Tamiflu and Relenza|Avian Influenza Neuraminidase%2C Tamiflu and Relenza]]
*[[Molecular Playground/Authoring|Molecular Playground/Authoring]]
*[[Molecular Playground/Relenza|Molecular Playground/Relenza]]
*[[Neuraminidase|Neuraminidase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Exo-alpha-sialidase]]
[[Category: Influenza a virus]]
[[Category: Colllins, P]]
[[Category: Gamblin, S J]]
[[Category: Haire, L F]]
[[Category: Hay, A J]]
[[Category: Lin, Y P]]
[[Category: Liu, J]]
[[Category: Martin, S R]]
[[Category: Russell, R J]]
[[Category: Skehel, J J]]
[[Category: Walker, P A]]
[[Category: Glycosidase]]
[[Category: H274y]]
[[Category: Hydrolase]]
[[Category: Membrane]]
[[Category: N1]]
[[Category: Neuraminidase]]
[[Category: Transmembrane]]
[[Category: Viral protein]]
[[Category: Virion]]
[[Category: Zanamivir]]