CSN

Multimodal Regulation of Cullin-RING Ligases by CSN

Coordinatore	EIDGENOESSISCHE TECHNISCHE HOCHSCHULE ZURICH    more  Organization address address: Raemistrasse 101 city: ZUERICH postcode: 8092 contact info Titolo: Prof. Nome: Matthias Cognome: Peter Email: send email Telefono: +41 44 633 65 86 Fax: +41 44 633 12 98
Nazionalità Coordinatore	Switzerland [CH]
Totale costo	184˙709 €
EC contributo	184˙709 €
Programma	FP7-PEOPLE Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
Code Call	FP7-PEOPLE-2011-IEF
Funding Scheme	MC-IEF
Anno di inizio	2013
Periodo (anno-mese-giorno)	2013-05-01   -   2015-04-30

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	EIDGENOESSISCHE TECHNISCHE HOCHSCHULE ZURICH  Organization address address: Raemistrasse 101 city: ZUERICH postcode: 8092 contact info Titolo: Prof. Nome: Matthias Cognome: Peter Email: send email Telefono: +41 44 633 65 86 Fax: +41 44 633 12 98	CH (ZUERICH)	coordinator	184˙709.40

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 Obiettivo del progetto (Objective)

'The COP9 Signalosome (CSN) is an eight-subunit molecular machine conserved in eukaryotes. Defects in CSN function are reported in human disorders and a CSN-related pathway recently emerged as a promising cancer drug target. CSN regulates embryonic development, DNA repair, cell cycle checkpoint progression and autophagy. The remarkable pleiotropy of CSN is partially explained through its enzymatic activity towards Cullin-RING E3 ubiquitin ligases (CRLs), which are activated by neddylation and inactivated by CSN-mediated deneddylation. However, loss of CSN function results in loss of CRL activity in cells: an observation which has not been fully explained and is known as the 'CSN paradox'. Intriguingly, we recently observed stable CSN-CRL complexes, irrespective of CRL neddylation and our preliminary results suggest a novel model of multimodal regulation of CRL architecture and function by CSN. Our key research objectives are to structurally characterize CSN-CRL complexes, to determine their functional significance and to dissect the mechanisms, which regulate the interaction. Owing to our team’s complementary expertise and the already established molecular tools, we are in a unique position to achieve these experimentally challenging aims. Our hypotheses are guided by 3D structural data and will be validated in established in vitro assays. All required protein complexes can be purified in large amounts from recombinant systems. In parallel, testing specific predictions and activities in vivo will benefit from already available human cell lines. Our findings will be complemented by an unbiased, large-scale proteomic analysis to characterize distinct CRL-CSN complexes and identify relevant post-translational modifications that regulate complex formation. We expect our results to have important implications for the fundamental understanding of CSN function and CRL regulation, and these may reveal new opportunities to develop specific inhibitors of clinical relevance.'