- EMDB-20390: Activated Class III PI-3 Kinase by NRBF2 -
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基本情報
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データベース: EMDB / ID: EMD-20390
タイトル
Activated Class III PI-3 Kinase by NRBF2
マップデータ
Full length NRBF2 pushes PI3KC3-C1 to an activate conformation in which peripheral membrane binding protein VPS34 is posed to phosphorylate substrate phosphatidylinositol.
試料
複合体: Class III PI 3-Kinase Complex 1 containing NRBF2-MIT-linker-BECN1, ATG14, VPS34, VPS15
National Institutes of Health/National Cancer Institute
F99 CA2230329
米国
National Institutes of Health/National Institute of General Medical Sciences
051487
米国
引用
ジャーナル: Proc Natl Acad Sci U S A / 年: 2019 タイトル: Structural pathway for allosteric activation of the autophagic PI 3-kinase complex I. 著者: Lindsey N Young / Felix Goerdeler / James H Hurley / 要旨: Autophagy induction by starvation and stress involves the enzymatic activation of the class III phosphatidylinositol (PI) 3-kinase complex I (PI3KC3-C1). The inactive basal state of PI3KC3-C1 is ...Autophagy induction by starvation and stress involves the enzymatic activation of the class III phosphatidylinositol (PI) 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 proautophagic MIT domain-containing protein NRBF2 was used to map the structural changes leading to activation. Cryoelectron microscopy was used to visualize a 2-step PI3KC3-C1 activation pathway driven by NRFB2 MIT domain binding. Binding of a single NRBF2 MIT domain 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.
ダウンロード / ファイル: emd_20390.map.gz / 形式: CCP4 / 大きさ: 166.4 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
Full length NRBF2 pushes PI3KC3-C1 to an activate conformation in which peripheral membrane binding protein VPS34 is posed to phosphorylate substrate phosphatidylinositol.