6QH3 image
Entry Detail
PDB ID:
6QH3
Keywords:
Title:
Catalytic domain of the human ubiquitin-conjugating enzyme UBE2S C118M
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2019-01-15
Release Date:
2019-07-17
Method Details:
Experimental Method:
Resolution:
2.90 Å
R-Value Free:
0.23
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 65
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Ubiquitin-conjugating enzyme E2 S
Mutations:C118M
Chain IDs:A (auth: B), B (auth: A)
Chain Length:156
Number of Molecules:2
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Autoinhibition Mechanism of the Ubiquitin-Conjugating Enzyme UBE2S by Autoubiquitination.
Structure 27 1195 1210.e7 (2019)
PMID: 31230944 DOI: 10.1016/j.str.2019.05.008

Abstact

Ubiquitin-conjugating enzymes (E2s) govern key aspects of ubiquitin signaling. Emerging evidence suggests that the activities of E2s are modulated by posttranslational modifications; the structural underpinnings, however, are largely unclear. Here, we unravel the structural basis and mechanistic consequences of a conserved autoubiquitination event near the catalytic center of E2s, using the human anaphase-promoting complex/cyclosome-associated UBE2S as a model system. Crystal structures we determined of the catalytic ubiquitin carrier protein domain combined with MD simulations reveal that the active-site region is malleable, which permits an adjacent ubiquitin acceptor site, Lys+5, to be ubiquitinated intramolecularly. We demonstrate by NMR that the Lys+5-linked ubiquitin inhibits UBE2S by obstructing its reloading with ubiquitin. By immunoprecipitation, quantitative mass spectrometry, and siRNA-and-rescue experiments we show that Lys+5 ubiquitination of UBE2S decreases during mitotic exit but does not influence proteasomal turnover of this E2. These findings suggest that UBE2S activity underlies inherent regulation during the cell cycle.

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