View source for 8htf


==Crystal structure of an effector in complex with ubiquitin==
<StructureSection load='8htf' size='340' side='right'caption='[[8htf]], [[Resolution|resolution]] 2.15&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8htf]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Chromobacterium_violaceum_ATCC_12472 Chromobacterium violaceum ATCC 12472] and [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8HTF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8HTF 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]] 2.151&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAD:NICOTINAMIDE-ADENINE-DINUCLEOTIDE'>NAD</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=8htf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8htf OCA], [https://pdbe.org/8htf PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8htf RCSB], [https://www.ebi.ac.uk/pdbsum/8htf PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8htf ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CTEC_CHRVO CTEC_CHRVO] ADP-ribosyltransferase that specifically modifies host ubiquitin on 'Thr-66' residue, which causes the shutdown of polyubiquitin synthesis and disrupts the recognition and reversal of polyubiquitin in host cells during infection (PubMed:32330457). Threonine ADP-ribosylation of ubiquitin prevents the transfer of ubiquitin from ubiquitin-activating enzyme E1 to ubiquitin-conjugating enzyme E2, which inhibits subsequent ubiquitin activation and leads to the shutdown of polyubiquitin synthesis in host cells (PubMed:32330457). The modification also causes dysfunction of polyubiquitin chains in cells, thereby blocking host ubiquitin signaling (PubMed:32330457). ADP-ribosylation by CteC is likely irreversible (PubMed:32330457). Plays a crucial role in bacterial colonization in mice during infection (PubMed:32330457).<ref>PMID:32330457</ref> 
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== Publication Abstract from PubMed ==
Ubiquitination plays essential roles in eukaryotic cellular processes. The effector protein CteC from Chromobacterium violaceum blocks host ubiquitination by mono-ADP-ribosylation of ubiquitin (Ub) at residue T66. However, the structural basis for this modification is unknown. Here we report three crystal structures of CteC in complexes with Ub, NAD(+) or ADP-ribosylated Ub, which represent different catalytic states of CteC in the modification. CteC adopts a special 'D-E' catalytic motif for catalysis and binds NAD(+) in a half-ligand binding mode. The specific recognition of Ub by CteC is determined by a relatively separate Ub-targeting domain and a long loop L6, not the classic ADP-ribosylating turn-turn loop. Structural analyses with biochemical results reveal that CteC represents a large family of poly (ADP-ribose) polymerase (PARP)-like ADP-ribosyltransferases, which harbors chimeric features from the R-S-E and H-Y-E classes of ADP-ribosyltransferases. The family of CteC-like ADP-ribosyltransferases has a common 'D-E' catalytic consensus and exists extensively in bacteria and eukaryotic microorganisms.

Molecular basis of threonine ADP-ribosylation of ubiquitin by bacterial ARTs.,Tan J, Xu Y, Wang X, Yan F, Xian W, Liu X, Chen Y, Zhu Y, Zhou Y Nat Chem Biol. 2024 Apr;20(4):463-472. doi: 10.1038/s41589-023-01475-3. Epub 2023 , Nov 9. PMID:37945894<ref>PMID:37945894</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 8htf" style="background-color:#fffaf0;"></div>

==See Also==
*[[3D structures of ubiquitin|3D structures of ubiquitin]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Chromobacterium violaceum ATCC 12472]]
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Tan J]]
[[Category: Wang X]]
[[Category: Zhou Y]]
[[Category: Zhu Y]]