Serveur d'exploration sur la rapamycine et les champignons

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Structure of TOR and its complex with KOG1.

Identifieur interne : 001681 ( Main/Exploration ); précédent : 001680; suivant : 001682

Structure of TOR and its complex with KOG1.

Auteurs : Alessandra Adami [Royaume-Uni] ; Bego A García-Alvarez ; Ernesto Arias-Palomo ; David Barford ; Oscar Llorca

Source :

RBID : pubmed:17679098

Descripteurs français

English descriptors

Abstract

The target of rapamycin (TOR) is a large (281 kDa) conserved Ser/Thr protein kinase that functions as a central controller of cell growth. TOR assembles into two distinct multiprotein complexes: TORC1 and TORC2. A defining feature of TORC1 is the interaction of TOR with KOG1 (Raptor in mammals) and its sensitivity to a rapamycin-FKBP12 complex. Here, we have reconstructed in three dimensions the 25 A resolution structures of endogenous budding yeast TOR1 and a TOR-KOG1 complex, using electron microscopy. TOR features distinctive N-terminal HEAT repeats that form a curved tubular-shaped domain that associates with the C-terminal WD40 repeat domain of KOG1. The N terminus of KOG1 is in proximity to the TOR kinase domain, likely functioning to bring substrates into the vicinity of the catalytic region. A model is proposed for the molecular architecture of the TOR-KOG1 complex explaining its sensitivity to rapamycin.

DOI: 10.1016/j.molcel.2007.05.040
PubMed: 17679098


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Le document en format XML

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