5JG6 image
Entry Detail
PDB ID:
5JG6
Keywords:
Title:
APC11-Ubv shows role of noncovalent RING-Ubiquitin interactions in processive multiubiquitination and Ubiquitin chain elongation by APC/C
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2016-04-19
Release Date:
2016-06-15
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Free:
0.21
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Anaphase-promoting complex subunit 11
Chain IDs:A, D
Chain Length:70
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Polyubiquitin-B
Chain IDs:B, C
Chain Length:84
Number of Molecules:2
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation

Abstact

Protein ubiquitination involves E1, E2, and E3 trienzyme cascades. E2 and RING E3 enzymes often collaborate to first prime a substrate with a single ubiquitin (UB) and then achieve different forms of polyubiquitination: multiubiquitination of several sites and elongation of linkage-specific UB chains. Here, cryo-EM and biochemistry show that the human E3 anaphase-promoting complex/cyclosome (APC/C) and its two partner E2s, UBE2C (aka UBCH10) and UBE2S, adopt specialized catalytic architectures for these two distinct forms of polyubiquitination. The APC/C RING constrains UBE2C proximal to a substrate and simultaneously binds a substrate-linked UB to drive processive multiubiquitination. Alternatively, during UB chain elongation, the RING does not bind UBE2S but rather lures an evolving substrate-linked UB to UBE2S positioned through a cullin interaction to generate a Lys11-linked chain. Our findings define mechanisms of APC/C regulation, and establish principles by which specialized E3-E2-substrate-UB architectures control different forms of polyubiquitination.

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Primary Citation of related structures