8CLS image
Deposition Date 2023-02-17
Release Date 2023-12-20
Last Version Date 2024-10-16
Entry Detail
PDB ID:
8CLS
Title:
Drosophila melanogaster insulin receptor ectodomain in complex with DILP5
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
4.00 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Insulin-like receptor
Gene (Uniprot):InR
Chain IDs:A, B
Chain Length:1068
Number of Molecules:2
Biological Source:Drosophila melanogaster
Polymer Type:polypeptide(L)
Molecule:Probable insulin-like peptide 5 A chain
Gene (Uniprot):Ilp5
Chain IDs:C, E, G
Chain Length:25
Number of Molecules:3
Biological Source:Drosophila melanogaster
Polymer Type:polypeptide(L)
Molecule:Probable insulin-like peptide 5
Gene (Uniprot):Ilp5
Chain IDs:D, F, H
Chain Length:28
Number of Molecules:3
Biological Source:Drosophila melanogaster
Ligand Molecules
Primary Citation
Structural conservation of insulin/IGF signalling axis at the insulin receptors level in Drosophila and humans.
Nat Commun 14 6271 6271 (2023)
PMID: 37805602 DOI: 10.1038/s41467-023-41862-x

Abstact

The insulin-related hormones regulate key life processes in Metazoa, from metabolism to growth, lifespan and aging, through an evolutionarily conserved insulin signalling axis (IIS). In humans the IIS axis is controlled by insulin, two insulin-like growth factors, two isoforms of the insulin receptor (hIR-A and -B), and its homologous IGF-1R. In Drosophila, this signalling engages seven insulin-like hormones (DILP1-7) and a single receptor (dmIR). This report describes the cryoEM structure of the dmIR ectodomain:DILP5 complex, revealing high structural homology between dmIR and hIR. The excess of DILP5 yields dmIR complex in an asymmetric 'T' conformation, similar to that observed in some complexes of human IRs. However, dmIR binds three DILP5 molecules in a distinct arrangement, showing also dmIR-specific features. This work adds structural support to evolutionary conservation of the IIS axis at the IR level, and also underpins a better understanding of an important model organism.

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Primary Citation of related structures