7U23 image
Deposition Date 2022-02-22
Release Date 2022-11-16
Last Version Date 2025-06-04
Entry Detail
PDB ID:
7U23
Title:
Single-chain LCDV-1 viral insulin-like peptide bound to IGF-1R ectodomain, leucine-zippered form
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
4.60 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:single-chain LCDV-1 viral insulin-like peptide
Chain IDs:C, D
Chain Length:62
Number of Molecules:2
Biological Source:Lymphocystis disease virus 1
Polymer Type:polypeptide(L)
Molecule:Insulin-like growth factor 1 receptor
Gene (Uniprot):IGF1R
Chain IDs:A (auth: E), B (auth: F)
Chain Length:952
Number of Molecules:2
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Interaction of a viral insulin-like peptide with the IGF-1 receptor produces a natural antagonist.
Nat Commun 13 6700 6700 (2022)
PMID: 36335114 DOI: 10.1038/s41467-022-34391-6

Abstact

Lymphocystis disease virus-1 (LCDV-1) and several other Iridoviridae encode viral insulin/IGF-1 like peptides (VILPs) with high homology to human insulin and IGFs. Here we show that while single-chain (sc) and double-chain (dc) LCDV1-VILPs have very low affinity for the insulin receptor, scLCDV1-VILP has high affinity for IGF1R where it can antagonize human IGF-1 signaling, without altering insulin signaling. Consequently, scLCDV1-VILP inhibits IGF-1 induced cell proliferation and growth hormone/IGF-1 induced growth of mice in vivo. Cryo-electron microscopy reveals that scLCDV1-VILP engages IGF1R in a unique manner, inducing changes in IGF1R conformation that led to separation, rather than juxtaposition, of the transmembrane segments and hence inactivation of the receptor. Thus, scLCDV1-VILP is a natural peptide with specific antagonist properties on IGF1R signaling and may provide a new tool to guide development of hormonal analogues to treat cancers or metabolic disorders sensitive to IGF-1 without affecting glucose metabolism.

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Primary Citation of related structures