View source for 9glr


==Crystal Structure of Human UBC9 C93E==
<StructureSection load='9glr' size='340' side='right'caption='[[9glr]], [[Resolution|resolution]] 1.72&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9glr]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9GLR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9GLR 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]] 1.72&#8491;</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=9glr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9glr OCA], [https://pdbe.org/9glr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9glr RCSB], [https://www.ebi.ac.uk/pdbsum/9glr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9glr ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/UBC9_HUMAN UBC9_HUMAN] Accepts the ubiquitin-like proteins SUMO1, SUMO2, SUMO3 and SUMO4 from the UBLE1A-UBLE1B E1 complex and catalyzes their covalent attachment to other proteins with the help of an E3 ligase such as RANBP2 or CBX4. Can catalyze the formation of poly-SUMO chains. Necessary for sumoylation of FOXL2 and KAT5. Essential for nuclear architecture and chromosome segregation.<ref>PMID:8668529</ref> <ref>PMID:11451954</ref> <ref>PMID:15809060</ref> <ref>PMID:19744555</ref> <ref>PMID:19638400</ref> <ref>PMID:17466333</ref> <ref>PMID:20077568</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The conjugation of ubiquitin (Ub) or ubiquitin-like proteins (UBL) to target proteins is a crucial post-translational modification that typically involves nucleophilic attack by a lysine on a charged E2 enzyme (E2~Ub/UBL), forming an oxyanion intermediate. Stabilizing this intermediate through an oxyanion hole is vital for progression of the reaction. Still, the mechanism of oxyanion stabilization in E2 enzymes remains unclear, although an asparagine residue in the conserved HPN motif of E2 enzymes was suggested to stabilize the oxyanion intermediate. Here, we study the E2 enzyme UFC1, which presents a TAK rather than an HPN motif. Crystal structures of UFC1 mutants, including one that mimics the oxyanion intermediate, combined with in vitro activity assays, suggest that UFC1 utilizes two distinct types of oxyanion holes, one that stabilizes the oxyanion intermediate during trans-ufmylation mediated by the E3 ligase, and another that stabilizes cis-driven auto-ufmylation. Our findings indicate that oxyanion stabilization is influenced by multiple factors, including C-alpha hydrogen bonding, and is adaptable, enabling different modes of action.

UFC1 reveals the multifactorial and plastic nature of oxyanion holes in E2 conjugating enzymes.,Kumar M, Banerjee S, Cohen-Kfir E, Mitelberg MB, Tiwari S, Isupov MN, Dessau M, Wiener R Nat Commun. 2025 Apr 25;16(1):3912. doi: 10.1038/s41467-025-58826-y. PMID:40280917<ref>PMID:40280917</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 9glr" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Banerjee S]]
[[Category: Kumar M]]
[[Category: Wiener R]]