- EMDB-26181: Cryo-EM Structure of insulin receptor-related receptor (IRR) in a... -
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データベース: EMDB / ID: EMD-26181
タイトル
Cryo-EM Structure of insulin receptor-related receptor (IRR) in apo-state captured at pH 7. The 3D refinement was focused on one of two halves with C1 symmetry applied
マップデータ
Cryo-EM Structure of insulin receptor-related receptor (IRR) in apo-state captured at pH 7. The 3D refinement was focused on one of two halves with C1 symmetry applied.
試料
複合体: Insulin receptor-related receptor (IRR) in apo-state captured at pH 7
タンパク質・ペプチド: Insulin receptor-related protein
キーワード
Receptor tyrosine kinase / insulin receptor family / SIGNALING PROTEIN
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM136976
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM142937
米国
引用
ジャーナル: Nat Struct Mol Biol / 年: 2023 タイトル: Structural basis of the alkaline pH-dependent activation of insulin receptor-related receptor. 著者: Liwei Wang / Catherine Hall / Jie Li / Eunhee Choi / Xiao-Chen Bai / 要旨: The insulin receptor (IR) family is a subfamily of receptor tyrosine kinases that controls metabolic homeostasis and cell growth. Distinct from IR and insulin-like growth factor 1 receptor, whose ...The insulin receptor (IR) family is a subfamily of receptor tyrosine kinases that controls metabolic homeostasis and cell growth. Distinct from IR and insulin-like growth factor 1 receptor, whose activation requires ligand binding, insulin receptor-related receptor (IRR)-the third member of the IR family-is activated by alkaline pH. However, the molecular mechanism underlying alkaline pH-induced IRR activation remains unclear. Here, we present cryo-EM structures of human IRR in both neutral pH inactive and alkaline pH active states. Combined with mutagenesis and cellular assays, we show that, upon pH increase, electrostatic repulsion of the pH-sensitive motifs of IRR disrupts its autoinhibited state and promotes a scissor-like rotation between two protomers, leading to a T-shaped active conformation. Together, our study reveals an unprecedented alkaline pH-dependent activation mechanism of IRR, opening up opportunities to understand the structure-function relationship of this important receptor.
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注釈
Cryo-EM Structure of insulin receptor-related receptor (IRR) in apo-state captured at pH 7. The 3D refinement was focused on one of two halves with C1 symmetry applied.
Cryo-EM Structure of insulin receptor-related receptor (IRR) in apo-state captured at pH 7. The 3D refinement was focused on one of two halves with C1 symmetry applied. Unfiltered half2 map
Cryo-EM Structure of insulin receptor-related receptor (IRR) in apo-state captured at pH 7. The 3D refinement was focused on one of two halves with C1 symmetry applied. Unfiltered half1 map
PDB-7tyj: Cryo-EM Structure of insulin receptor-related receptor (IRR) in apo-state captured at pH 7. The 3D refinement was focused on one of two halves with C1 symmetry applied