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- W2972114877 abstract "Abstract Autophagy induction by starvation and stress involves the enzymatic activation of the class III phosphatidylinositol 3-kinase complex I (PI3KC3-C1). The inactive basal state of PI3KC3-C1 is maintained by inhibitory contacts between the VPS15 protein kinase and VPS34 lipid kinase domains that restrict the conformation of the VPS34 activation loop. Here, the pro-autophagic MIT domain-containing protein NRBF2 was used to map the structural changes leading to activation. Cryo-EM was used to visualize stepwise PI3KC3-C1 activating effects of binding the NRFB2 MIT domains. Binding of a single NRBF2 MIT domain to bends the helical solenoid of the VPS15 scaffold, displaces the protein kinase domain of VPS15, and releases the VPS34 kinase domain from the inhibited conformation. Binding of a second MIT stabilizes the VPS34 lipid kinase domain in an active conformation that has an unrestricted activation loop and is poised for access to membranes." @default.
- W2972114877 created "2019-09-12" @default.
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- W2972114877 date "2019-09-05" @default.
- W2972114877 modified "2023-10-14" @default.
- W2972114877 title "Structural Pathway for Allosteric Activation of the Autophagic PI 3-Kinase Complex I" @default.
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- W2972114877 doi "https://doi.org/10.1101/758797" @default.
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