6Y5N image
Entry Detail
PDB ID:
6Y5N
Keywords:
Title:
RING-DTC domain of Deltex1
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2020-02-25
Release Date:
2020-09-30
Method Details:
Experimental Method:
Resolution:
1.88 Å
R-Value Free:
0.21
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:E3 ubiquitin-protein ligase DTX1
Chain IDs:A, B
Chain Length:235
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Structural insights into ADP-ribosylation of ubiquitin by Deltex family E3 ubiquitin ligases.
Sci Adv 6 ? ? (2020)
PMID: 32948590 DOI: 10.1126/sciadv.abc0418

Abstact

Cellular cross-talk between ubiquitination and other posttranslational modifications contributes to the regulation of numerous processes. One example is ADP-ribosylation of the carboxyl terminus of ubiquitin by the E3 DTX3L/ADP-ribosyltransferase PARP9 heterodimer, but the mechanism remains elusive. Here, we show that independently of PARP9, the conserved carboxyl-terminal RING and DTC (Deltex carboxyl-terminal) domains of DTX3L and other human Deltex proteins (DTX1 to DTX4) catalyze ADP-ribosylation of ubiquitin's Gly76 Structural studies reveal a hitherto unknown function of the DTC domain in binding NAD+ Deltex RING domain recruits E2 thioesterified with ubiquitin and juxtaposes it with NAD+ bound to the DTC domain to facilitate ADP-ribosylation of ubiquitin. This ubiquitin modification prevents its activation but is reversed by the linkage nonspecific deubiquitinases. Our study provides mechanistic insights into ADP-ribosylation of ubiquitin by Deltex E3s and will enable future studies directed at understanding the increasingly complex network of ubiquitin cross-talk.

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