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


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Structural basis of the alkaline pH-dependent activation of insulin receptor-related receptor.

Wang, L.Hall, C.Li, J.Choi, E.Bai, X.C.

(2023) Nat Struct Mol Biol 30: 661-669

  • DOI: https://doi.org/10.1038/s41594-023-00974-0
  • Primary Citation of Related Structures:  
    7TYJ, 7TYK, 7TYM

  • PubMed Abstract: 

    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.


  • Organizational Affiliation

    Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Insulin receptor-related protein
A, B
1,297Homo sapiensMutation(s): 0 
Gene Names: INSRRIRR
EC: 2.7.10.1
UniProt & NIH Common Fund Data Resources
Find proteins for P14616 (Homo sapiens)
Explore P14616 
Go to UniProtKB:  P14616
PHAROS:  P14616
GTEx:  ENSG00000027644 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP14616
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION
MODEL REFINEMENTPHENIX

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM136976
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR35GM142937

Revision History  (Full details and data files)

  • Version 1.0: 2023-02-15
    Type: Initial release
  • Version 1.1: 2023-04-19
    Changes: Database references
  • Version 1.2: 2023-04-26
    Changes: Database references
  • Version 1.3: 2023-05-31
    Changes: Database references
  • Version 1.4: 2024-10-16
    Changes: Data collection, Structure summary