7PG3

Low resolution Cryo-EM structure of the full-length insulin receptor bound to 3 insulin, conf 2


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 7.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural Investigations of Full-Length Insulin Receptor Dynamics and Signalling.

Nielsen, J.Brandt, J.Boesen, T.Hummelshoj, T.Slaaby, R.Schluckebier, G.Nissen, P.

(2022) J Mol Biol 434: 167458-167458

  • DOI: https://doi.org/10.1016/j.jmb.2022.167458
  • Primary Citation of Related Structures:  
    7PG0, 7PG2, 7PG3, 7PG4

  • PubMed Abstract: 

    Insulin regulates glucose homeostasis via binding and activation of the insulin receptor dimer at two distinct pairs of binding sites 1 and 2. Here, we present cryo-EM studies of full-length human insulin receptor (hIR) in an active state obtained at non-saturating, physiologically relevant insulin conditions. Insulin binds asymmetrically to the receptor under these conditions, occupying up to three of the four possible binding sites. Deletion analysis of the receptor together with site specific peptides and insulin analogs used in binding studies show that both sites 1 and 2 are required for high insulin affinity. We identify a homotypic interaction of the fibronectin type III domain (FnIII-3) of IR resulting in tight interaction of membrane proximal domains of the active, asymmetric receptor dimer. Our results show how insulin binding at two distinct types of sites disrupts the autoinhibited apo-IR dimer and stabilizes the active dimer. We propose an insulin binding and activation mechanism, which is sequential, exhibits negative cooperativity, and is based on asymmetry at physiological insulin concentrations with one to three insulin molecules activating IR.


  • Organizational Affiliation

    Department of Molecular Biology and Genetics, Danish Research Institute of Translational Neuroscience - DANDRITE, Nordic EMBL Partnership for Molecular Medicine, Aarhus University, Aarhus, Denmark; Novo Nordisk A/S, Novo Nordisk Park, Måløv, Denmark.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Isoform Short of Insulin receptor
A, B
1,382Homo sapiensMutation(s): 0 
Gene Names: INSR
EC: 2.7.10.1
UniProt & NIH Common Fund Data Resources
Find proteins for P06213 (Homo sapiens)
Explore P06213 
Go to UniProtKB:  P06213
PHAROS:  P06213
GTEx:  ENSG00000171105 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP06213
Sequence Annotations
Expand
  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
InsulinC,
E,
G [auth I]
21Homo sapiensMutation(s): 0 
Gene Names: INS
UniProt & NIH Common Fund Data Resources
Find proteins for P01308 (Homo sapiens)
Explore P01308 
Go to UniProtKB:  P01308
PHAROS:  P01308
GTEx:  ENSG00000254647 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01308
Sequence Annotations
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
InsulinD,
F,
H [auth J]
30Homo sapiensMutation(s): 0 
Gene Names: INS
UniProt & NIH Common Fund Data Resources
Find proteins for P01308 (Homo sapiens)
Explore P01308 
Go to UniProtKB:  P01308
PHAROS:  P01308
GTEx:  ENSG00000254647 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01308
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 7.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX1.19.2

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Other governmentDenmark--

Revision History  (Full details and data files)

  • Version 1.0: 2022-02-02
    Type: Initial release
  • Version 1.1: 2022-02-16
    Changes: Database references