View source for 2w20


==Structure of the catalytic domain of the native NanA sialidase from Streptococcus pneumoniae==
<StructureSection load='2w20' size='340' side='right'caption='[[2w20]], [[Resolution|resolution]] 1.49&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2w20]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptococcus_pneumoniae_R6 Streptococcus pneumoniae R6]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2W20 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2W20 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]] 1.49&#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=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MES:2-(N-MORPHOLINO)-ETHANESULFONIC+ACID'>MES</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=2w20 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2w20 OCA], [https://pdbe.org/2w20 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2w20 RCSB], [https://www.ebi.ac.uk/pdbsum/2w20 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2w20 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/NANA_STRR6 NANA_STRR6] 
== 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/w2/2w20_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/main_output.php?pdb_ID=2w20 ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Streptococcus pneumoniae genomes encode three sialidases, NanA, NanB and NanC, which are key virulence factors that remove sialic acids from various glycoconjugates. The enzymes have potential as drug targets and also as vaccine candidates. The 115 kDa NanA is the largest of the three sialidases and is anchored to the bacterial membrane. Although recombinantly expressed full-length NanA was soluble, it failed to crystallize; therefore, a 56.5 kDa domain that retained full enzyme activity was subcloned. The purified enzyme was crystallized in 0.1 M MES pH 6.5, 30%(w/v) PEG 4000 using the sitting-drop vapour-diffusion method. Data were collected at 100 K to 2.5 A resolution from a crystal grown in the presence of the inhibitor 2-deoxy-2,3-dehydro-N-acetyl neuraminic acid. The crystal belongs to space group P2(1)2(1)2(1), with unit-cell parameters a = 49.2, b = 95.6, c = 226.6 A. The structure was solved by molecular replacement and refined to final R and R(free) factors of 0.246 and 0.298, respectively.

Structure of the catalytic domain of Streptococcus pneumoniae sialidase NanA.,Xu G, Li X, Andrew PW, Taylor GL Acta Crystallogr Sect F Struct Biol Cryst Commun. 2008 Sep 1;64(Pt, 9):772-5. Epub 2008 Aug 20. PMID:18765901<ref>PMID:18765901</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2w20" style="background-color:#fffaf0;"></div>

==See Also==
*[[Neuraminidase 3D structures|Neuraminidase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Streptococcus pneumoniae R6]]
[[Category: Andrew PW]]
[[Category: Taylor GL]]
[[Category: Xu G]]