7p1b: Difference between revisions

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<StructureSection load='7p1b' size='340' side='right'caption='[[7p1b]], [[Resolution|resolution]] 1.45&Aring;' scene=''>
<StructureSection load='7p1b' size='340' side='right'caption='[[7p1b]], [[Resolution|resolution]] 1.45&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[7p1b]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Aspergillus_terreus_NIH2624 Aspergillus terreus NIH2624]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7P1B OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7P1B FirstGlance]. <br>
<table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7P1B OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7P1B 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]] 1.45&#8491;</td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.45&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SNN:L-3-AMINOSUCCINIMIDE'>SNN</scene></td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SNN:L-3-AMINOSUCCINIMIDE'>SNN</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=7p1b FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7p1b OCA], [https://pdbe.org/7p1b PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7p1b RCSB], [https://www.ebi.ac.uk/pdbsum/7p1b PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7p1b ProSAT]</span></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=7p1b FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7p1b OCA], [https://pdbe.org/7p1b PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7p1b RCSB], [https://www.ebi.ac.uk/pdbsum/7p1b PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7p1b ProSAT]</span></td></tr>
</table>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q0CMX0_ASPTN Q0CMX0_ASPTN]
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Sialidases catalyze the release of sialic acid from the terminus of glycan chains. We previously characterized the sialidase from the opportunistic fungal pathogen, Aspergillus fumigatus, and showed that it is a Kdnase. That is, this enzyme prefers 3-deoxy-d-glycero-d-galacto-non-2-ulosonates (Kdn glycosides) as the substrate compared to N-acetylneuraminides (Neu5Ac). Here, we report characterization and crystal structures of putative sialidases from two other ascomycete fungal pathogens, Aspergillus terreus (AtS) and Trichophyton rubrum (TrS). Unlike A. fumigatus Kdnase (AfS), hydrolysis with the Neu5Ac substrates was negligible for TrS and AtS; thus, TrS and AtS are selective Kdnases. The second-order rate constant for hydrolysis of aryl Kdn glycosides by AtS is similar to that by AfS but 30-fold higher by TrS. The structures of these glycoside hydrolase family 33 (GH33) enzymes in complex with a range of ligands for both AtS and TrS show subtle changes in ring conformation that mimic the Michaelis complex, transition state, and covalent intermediate formed during catalysis. In addition, they can aid identification of important residues for distinguishing between Kdn and Neu5Ac substrates. When A. fumigatus, A. terreus, and T. rubrum were grown in chemically defined media, Kdn was detected in mycelial extracts, but Neu5Ac was only observed in A. terreus or T. rubrum extracts. The C8 monosaccharide 3-deoxy-d-manno-oct-2-ulosonic acid (Kdo) was also identified in A. fumigatus and T. rubrum samples. A fluorescent Kdn probe was synthesized and revealed the localization of AfS in vesicles at the cell surface.
Kinetic and Structural Characterization of Sialidases (Kdnases) from Ascomycete Fungal Pathogens.,Nejatie A, Steves E, Gauthier N, Baker J, Nesbitt J, McMahon SA, Oehler V, Thornton NJ, Noyovitz B, Khazaei K, Byers BW, Zandberg WF, Gloster TM, Moore MM, Bennet AJ ACS Chem Biol. 2021 Nov 19;16(11):2632-2640. doi: 10.1021/acschembio.1c00666., Epub 2021 Nov 1. PMID:34724608<ref>PMID:34724608</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7p1b" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Aspergillus terreus NIH2624]]
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Gloster TM]]
[[Category: Gloster TM]]
[[Category: McMahon SA]]
[[Category: McMahon SA]]

Latest revision as of 06:39, 21 November 2024

Apo structure of KDNase from Aspergillus Terrerus

7p1b, resolution 1.45Å

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