View source for 7tvo


==Viral AMG chitosanase V-Csn, E157Q mutant==
<StructureSection load='7tvo' size='340' side='right'caption='[[7tvo]], [[Resolution|resolution]] 1.15&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7tvo]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Unclassified_sequences Unclassified sequences]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7TVO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7TVO 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]] 1.15&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</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'>[https://proteopedia.org/fgij/fg.htm?mol=7tvo FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7tvo OCA], [https://pdbe.org/7tvo PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7tvo RCSB], [https://www.ebi.ac.uk/pdbsum/7tvo PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7tvo ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Metagenomics is unearthing the previously hidden world of soil viruses. Many soil viral sequences in metagenomes contain putative auxiliary metabolic genes (AMGs) that are not associated with viral replication. Here, we establish that AMGs on soil viruses actually produce functional, active proteins. We focus on AMGs that potentially encode chitosanase enzymes that metabolize chitin - a common carbon polymer. We express and functionally screen several chitosanase genes identified from environmental metagenomes. One expressed protein showing endo-chitosanase activity (V-Csn) is crystalized and structurally characterized at ultra-high resolution, thus representing the structure of a soil viral AMG product. This structure provides details about the active site, and together with structure models determined using AlphaFold, facilitates understanding of substrate specificity and enzyme mechanism. Our findings support the hypothesis that soil viruses contribute auxiliary functions to their hosts.

Structural characterization of a soil viral auxiliary metabolic gene product - a functional chitosanase.,Wu R, Smith CA, Buchko GW, Blaby IK, Paez-Espino D, Kyrpides NC, Yoshikuni Y, McDermott JE, Hofmockel KS, Cort JR, Jansson JK Nat Commun. 2022 Sep 19;13(1):5485. doi: 10.1038/s41467-022-32993-8. PMID:36123347<ref>PMID:36123347</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7tvo" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Unclassified sequences]]
[[Category: Buchko GW]]
[[Category: Cort JR]]
[[Category: Hofmockel KS]]
[[Category: Jansson JK]]
[[Category: Smith CA]]
[[Category: Wu R]]