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Tension of ENDOmembranes maintained by TORC1

The target of the bacterial macrolide rapamycin, TOR, is a ser/thr protein kinase that assembles into two distinct protein complexes, conserved from yeast to human, we named TORC1 and TORC2. TORC1 is directly bound and inhibited b... ver más

31/10/2024

UNIGE

2M€

Presupuesto del proyecto: 2M€

Líder del proyecto

UNIVERSITE DE GENEVE No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Fecha límite participación Sin fecha límite de participación.

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Financiación concedida El organismo H2020 notifico la concesión del proyecto el día 2024-10-31

ERC-2018-ADG: ERC Advanced Grant Scope:Objectives

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2 Participantes

UNIGE

2.26M€ | Lider

WIDE WORLD GEOGRAPHIC SERVIC...

276.51K€ | Participante

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Duración del proyecto: 66 meses Fecha Inicio: 2019-04-18
Fecha Fin: 2024-10-31

Líder del proyecto

UNIVERSITE DE GENEVE No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Presupuesto del proyecto 2M€

Fecha límite de participación Sin fecha límite de participación.

Descripción del proyecto The target of the bacterial macrolide rapamycin, TOR, is a ser/thr protein kinase that assembles into two distinct protein complexes, conserved from yeast to human, we named TORC1 and TORC2. TORC1 is directly bound and inhibited by rapamycin and studies with rapamycin have revealed that TORC1 plays a central role in coupling nutrient cues to biomass synthesis and turnover. The lack of a specific inhibitor for TORC2 has made the study of this complex much more challenging. We overcame this challenge by solving the structure of yeast TORC2 which revealed why it is insensitive to rapamycin and enabled us to create a rapamycin-sensitive TORC2 variant. We also developed two small molecules, one that dissipates plasma membrane (PM) tension and the other that serves as a biosensor of PM tension. With this suite of chemical-biology tools we confirmed that TORC2 functions in a mechanotransduction pathway to maintain tension homeostasis of the PM. Concurrently, solving the structure of TORC1 revealed that its activity is regulated via assembly into a huge, inactive helix which we named a TOROID – TORC1 Organized in an Inactive Domain. In this grant, was ask if these major advances are transferable; i.e. can lessons learned regarding TORC2 be applied to TORC1, and vice versa? Our major aim is to determine if and how TORC1 regulates vacuolar membrane (VM) tension. To this end, we will develop novel chemical probes to monitor VM tension and we will use genetic screens, quantitative phosphoproteomics, in vitro assays, high-throughput compound screens, STORM and FRAP imaging, and state-of-the-art cryo-EM to learn how TORC1 senses and regulates VM tension. Our other aim, prompted by our TOROID discovery, is to solve the TOROID-like structure that TORC2 forms upon glucose depletion. This work will reveal new mechanisms in growth control, and details in TORC1 and TORC2 regulation that may inform future therapeutic interventions for these medically relevant signalling complexes.

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