View source for 6hp0


==Complex of Neuraminidase from H1N1 Influenza Virus in Complex with Oseltamivir Triazol Derivative==
<StructureSection load='6hp0' size='340' side='right'caption='[[6hp0]], [[Resolution|resolution]] 1.88&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6hp0]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Influenza_A_virus_(A/Texas/17/2009(H1N1)) Influenza A virus (A/Texas/17/2009(H1N1))]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6HP0 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6HP0 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]] 1.88&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=FUC:ALPHA-L-FUCOSE'>FUC</scene>, <scene name='pdbligand=GJT:(3~{R},4~{R},5~{S})-4-acetamido-5-[4-(hydroxymethyl)-1,2,3-triazol-1-yl]-3-pentan-3-yloxy-cyclohexene-1-carboxylic+acid'>GJT</scene>, <scene name='pdbligand=MAN:ALPHA-D-MANNOSE'>MAN</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=PGE:TRIETHYLENE+GLYCOL'>PGE</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=6hp0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6hp0 OCA], [https://pdbe.org/6hp0 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6hp0 RCSB], [https://www.ebi.ac.uk/pdbsum/6hp0 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6hp0 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/C6KP13_9INFA C6KP13_9INFA] Catalyzes the removal of terminal sialic acid residues from viral and cellular glycoconjugates. Cleaves off the terminal sialic acids on the glycosylated HA during virus budding to facilitate virus release. Additionally helps virus spread through the circulation by further removing sialic acids from the cell surface. These cleavages prevent self-aggregation and ensure the efficient spread of the progeny virus from cell to cell. Otherwise, infection would be limited to one round of replication. Described as a receptor-destroying enzyme because it cleaves a terminal sialic acid from the cellular receptors. May facilitate viral invasion of the upper airways by cleaving the sialic acid moities on the mucin of the airway epithelial cells. Likely to plays a role in the budding process through its association with lipid rafts during intracellular transport. May additionally display a raft-association independent effect on budding. Plays a role in the determination of host range restriction on replication and virulence. Sialidase activity in late endosome/lysosome traffic seems to enhance virus replication.[HAMAP-Rule:MF_04071]
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
This study focuses on design, synthesis and in vitro evaluation of inhibitory potency of two series of sialylmimetic that target an exosite ("150-cavity") adjacent to the active site of influenza neuraminidases from A/California/07/2009 (H1N1) pandemic strain and A/chicken/Nakorn-Patom/Thailand/CU-K2-2004 (H5N1). The structure-activity analysis as well as 3-D structure of the complex of parental compound with the pandemic neuraminidase p09N1 revealed high flexibility of the 150-cavity towards various modification of the neuraminidase inhibitors. Furthermore, our comparison of two methods for inhibition constant determination performed at slightly different pH values suggest that the experimental conditions of the measurement could dramatically influence the outcome of the analysis in the compound-dependent manner. Therefore, previously reported K(i) values determined at non-physiological pH should be carefully scrutinized.

Investigation of flexibility of neuraminidase 150-loop using tamiflu derivatives in influenza A viruses H1N1 and H5N1.,Zima V, Albinana CB, Rojikova K, Pokorna J, Pachl P, Rezacova P, Hudlicky J, Navratil V, Majer P, Konvalinka J, Kozisek M, Machara A Bioorg Med Chem. 2019 Jul 1;27(13):2935-2947. doi: 10.1016/j.bmc.2019.05.024. , Epub 2019 May 17. PMID:31128993<ref>PMID:31128993</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6hp0" style="background-color:#fffaf0;"></div>

==See Also==
*[[Neuraminidase 3D structures|Neuraminidase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Pachl P]]
[[Category: Pokorna J]]