Download MendeleyMolecular mechanisms of APC/C release from spindle assembly checkpoint inhibition by APC/C SUMOylation.
Yatskevich, S., Kroonen, J.S., Alfieri, C., Tischer, T., Howes, A.C., Clijsters, L., Yang, J., Zhang, Z., Yan, K., Vertegaal, A.C.O., Barford, D.(2021) Cell Rep 34: 108929-108929
- PubMed: 33789095
- DOI: https://doi.org/10.1016/j.celrep.2021.108929
- Primary Citation of Related Structures:
6TNT - PubMed Abstract:
The anaphase-promoting complex/cyclosome (APC/C) is an E3 ubiquitin ligase that controls cell cycle transitions. Its regulation by the spindle assembly checkpoint (SAC) is coordinated with the attachment of sister chromatids to the mitotic spindle. APC/C SUMOylation on APC4 ensures timely anaphase onset and chromosome segregation. To understand the structural and functional consequences of APC/C SUMOylation, we reconstituted SUMOylated APC/C for electron cryo-microscopy and biochemical analyses. SUMOylation of the APC/C causes a substantial rearrangement of the WHB domain of APC/C's cullin subunit (APC2 WHB ). Although APC/C Cdc20 SUMOylation results in a modest impact on normal APC/C Cdc20 activity, repositioning APC2 WHB reduces the affinity of APC/C Cdc20 for the mitotic checkpoint complex (MCC), the effector of the SAC. This attenuates MCC-mediated suppression of APC/C Cdc20 activity, allowing for more efficient ubiquitination of APC/C Cdc20 substrates in the presence of the MCC. Thus, SUMOylation stimulates the reactivation of APC/C Cdc20 when the SAC is silenced, contributing to timely anaphase onset.
Organizational Affiliation:
MRC Laboratory of Molecular Biology, Cambridge Biomedical Campus, Francis Crick Avenue, Cambridge CB2 0QH, UK.
