4yz2: Difference between revisions
No edit summary |
No edit summary |
||
| (4 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
==Crystal Structure of Streptococcus pneumoniae NanC, in complex with 2-deoxy-2,3-didehydro-N-acetylneuraminic acid.== | ==Crystal Structure of Streptococcus pneumoniae NanC, in complex with 2-deoxy-2,3-didehydro-N-acetylneuraminic acid.== | ||
<StructureSection load='4yz2' size='340' side='right' caption='[[4yz2]], [[Resolution|resolution]] 2.06Å' scene=''> | <StructureSection load='4yz2' size='340' side='right'caption='[[4yz2]], [[Resolution|resolution]] 2.06Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[4yz2]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4YZ2 OCA]. For a <b>guided tour on the structure components</b> use [ | <table><tr><td colspan='2'>[[4yz2]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptococcus_pneumoniae Streptococcus pneumoniae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4YZ2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4YZ2 FirstGlance]. <br> | ||
</td></tr><tr id=' | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.06Å</td></tr> | ||
<tr id=' | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=DAN:2-DEOXY-2,3-DEHYDRO-N-ACETYL-NEURAMINIC+ACID'>DAN</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | ||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4yz2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4yz2 OCA], [https://pdbe.org/4yz2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4yz2 RCSB], [https://www.ebi.ac.uk/pdbsum/4yz2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4yz2 ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Function == | |||
[https://www.uniprot.org/uniprot/A0A0H2UQE4_STRPN A0A0H2UQE4_STRPN] | |||
<div style="background-color:#fffaf0;"> | <div style="background-color:#fffaf0;"> | ||
== Publication Abstract from PubMed == | == Publication Abstract from PubMed == | ||
| Line 16: | Line 19: | ||
</div> | </div> | ||
<div class="pdbe-citations 4yz2" style="background-color:#fffaf0;"></div> | <div class="pdbe-citations 4yz2" style="background-color:#fffaf0;"></div> | ||
==See Also== | |||
*[[Neuraminidase 3D structures|Neuraminidase 3D structures]] | |||
== References == | == References == | ||
<references/> | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: | [[Category: Streptococcus pneumoniae]] | ||
[[Category: | [[Category: Lukacik P]] | ||
[[Category: | [[Category: Owen CD]] | ||
[[Category: | [[Category: Potter JA]] | ||
[[Category: | [[Category: Taylor GL]] | ||
[[Category: | [[Category: Walsh MA]] | ||
Latest revision as of 14:32, 9 May 2024
Crystal Structure of Streptococcus pneumoniae NanC, in complex with 2-deoxy-2,3-didehydro-N-acetylneuraminic acid.Crystal Structure of Streptococcus pneumoniae NanC, in complex with 2-deoxy-2,3-didehydro-N-acetylneuraminic acid.
Structural highlights
FunctionPublication Abstract from PubMedStreptococcus pneumoniae is an important human pathogen that causes a range of disease states. Sialidases are important bacterial virulence factors. There are three pneumococcal sialidases: NanA, NanB, and NanC. NanC is an unusual sialidase in that its primary reaction product is 2-deoxy-2,3-didehydro-N-acetylneuraminic acid (Neu5Ac2en, also known as DANA), a nonspecific hydrolytic sialidase inhibitor. The production of Neu5Ac2en from alpha2-3-linked sialosides by the catalytic domain is confirmed within a crystal structure. A covalent complex with 3-fluoro-beta-N-acetylneuraminic acid is also presented, suggesting a common mechanism with other sialidases up to the final step of product formation. A conformation change in an active site hydrophobic loop on ligand binding constricts the entrance to the active site. In addition, the distance between the catalytic acid/base (Asp-315) and the ligand anomeric carbon is unusually short. These features facilitate a novel sialidase reaction in which the final step of product formation is direct abstraction of the C3 proton by the active site aspartic acid, forming Neu5Ac2en. NanC also possesses a carbohydrate-binding module, which is shown to bind alpha2-3- and alpha2-6-linked sialosides, as well as N-acetylneuraminic acid, which is captured in the crystal structure following hydration of Neu5Ac2en by NanC. Overall, the pneumococcal sialidases show remarkable mechanistic diversity while maintaining a common structural scaffold. Streptococcus pneumoniae NanC: STRUCTURAL INSIGHTS INTO THE SPECIFICITY AND MECHANISM OF A SIALIDASE THAT PRODUCES A SIALIDASE INHIBITOR.,Owen CD, Lukacik P, Potter JA, Sleator O, Taylor GL, Walsh MA J Biol Chem. 2015 Nov 13;290(46):27736-48. doi: 10.1074/jbc.M115.673632. Epub, 2015 Sep 14. PMID:26370075[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
|
| ||||||||||||||||||