ジャーナル: Mol Cell / 年: 2020 タイトル: Interconversion between Anticipatory and Active GID E3 Ubiquitin Ligase Conformations via Metabolically Driven Substrate Receptor Assembly. 著者: Shuai Qiao / Christine R Langlois / Jakub Chrustowicz / Dawafuti Sherpa / Ozge Karayel / Fynn M Hansen / Viola Beier / Susanne von Gronau / Daniel Bollschweiler / Tillman Schäfer / Arno F ...著者: Shuai Qiao / Christine R Langlois / Jakub Chrustowicz / Dawafuti Sherpa / Ozge Karayel / Fynn M Hansen / Viola Beier / Susanne von Gronau / Daniel Bollschweiler / Tillman Schäfer / Arno F Alpi / Matthias Mann / J Rajan Prabu / Brenda A Schulman / 要旨: Cells respond to environmental changes by toggling metabolic pathways, preparing for homeostasis, and anticipating future stresses. For example, in Saccharomyces cerevisiae, carbon stress-induced ...Cells respond to environmental changes by toggling metabolic pathways, preparing for homeostasis, and anticipating future stresses. For example, in Saccharomyces cerevisiae, carbon stress-induced gluconeogenesis is terminated upon glucose availability, a process that involves the multiprotein E3 ligase GID recruiting N termini and catalyzing ubiquitylation of gluconeogenic enzymes. Here, genetics, biochemistry, and cryoelectron microscopy define molecular underpinnings of glucose-induced degradation. Unexpectedly, carbon stress induces an inactive anticipatory complex (GID), which awaits a glucose-induced substrate receptor to form the active GID. Meanwhile, other environmental perturbations elicit production of an alternative substrate receptor assembling into a related E3 ligase complex. The intricate structure of GID enables anticipating and ultimately binding various N-degron-targeting (i.e., "N-end rule") substrate receptors, while the GID E3 forms a clamp-like structure juxtaposing substrate lysines with the ubiquitylation active site. The data reveal evolutionarily conserved GID complexes as a family of multisubunit E3 ubiquitin ligases responsive to extracellular stimuli.