Objective
This research proposal describes an ambitious effort to characterize structurally and biochemically ubiquitin chain initiation and elongation by the anaphase-promoting complex or cyclosome (APC/C) in complex with two well-characterized substrates. The APC/C is a multi-subunit cullin-RING E3 ubiquitin ligase that controls progression through the cell cycle by a temporal regulation of its activity and substrate specificity. Regulation and specificity of this E3 ligase is achieved through mutually exclusive binding of two structurally related co-activator subunits termed Cdc20 and Cdh1, as well as through APC/C inhibitors, varying substrate affinities and auto-ubiquitylation of its cognate E2s, namely UbcH10 and Ube2S. In order to understand ubiquitin chain initiation and elongation of the two well-known APC/C substrates cyclin B and securin, I am aiming to use a combined approach of cryo-electron microscopy, X-ray crystallography and a variety of biochemical methods. Within this project I will use cryo-electron microscopy studies to uncover the molecular mechanisms of substrate recognition and ubiquitin chain initiation and elongation by analyzing the APC/CCdh1 co-activator complex bound to its transiently associated E2 enzymes Ube2S or UbcH10 and one of the aforementioned high affinity substrates.
Crystallization of selected sub-complexes, namely the catalytic core of the APC/C (composed of Apc2 and Apc11) is intended. If obtained, this high-resolution information will then assist the interpretation of the resulting density maps derived from cryo-electron microscopy.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: https://op.europa.eu/en/web/eu-vocabularies/euroscivoc.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: https://op.europa.eu/en/web/eu-vocabularies/euroscivoc.
- medical and health sciencesbasic medicinemedicinal chemistry
- natural sciencesearth and related environmental sciencesgeologymineralogycrystallography
- natural sciencesphysical sciencesopticsmicroscopy
- natural sciencesbiological sciencesbiochemistrybiomoleculesproteinsenzymes
- natural sciencescomputer and information sciencesdata sciencedata processing
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Programme(s)
Funding Scheme
MSCA-IF-EF-ST - Standard EFCoordinator
SN2 1FL Swindon
United Kingdom