8TCF image
Entry Detail
PDB ID:
8TCF
EMDB ID:
Keywords:
Title:
Integrin alpha-v beta-8 in complex with minibinder B8_BP_dsulf
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2023-06-30
Release Date:
2023-09-27
Method Details:
Experimental Method:
Resolution:
2.90 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Integrin alpha-V heavy chain
Chain IDs:A
Chain Length:444
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Integrin beta-8
Chain IDs:B
Chain Length:359
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Minibinder B8_BP_dslf
Chain IDs:C
Chain Length:75
Number of Molecules:1
Biological Source:synthetic construct
Primary Citation

Abstact

The RGD (Arg-Gly-Asp)-binding integrins αvβ6 and αvβ8 are clinically validated cancer and fibrosis targets of considerable therapeutic importance. Compounds that can discriminate between homologous αvβ6 and αvβ8 and other RGD integrins, stabilize specific conformational states, and have high thermal stability could have considerable therapeutic utility. Existing small molecule and antibody inhibitors do not have all these properties, and hence new approaches are needed. Here we describe a generalized method for computationally designing RGD-containing miniproteins selective for a single RGD integrin heterodimer and conformational state. We design hyperstable, selective αvβ6 and αvβ8 inhibitors that bind with picomolar affinity. CryoEM structures of the designed inhibitor-integrin complexes are very close to the computational design models, and show that the inhibitors stabilize specific conformational states of the αvβ6 and the αvβ8 integrins. In a lung fibrosis mouse model, the αvβ6 inhibitor potently reduced fibrotic burden and improved overall lung mechanics, demonstrating the therapeutic potential of de novo designed integrin binding proteins with high selectivity.

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Primary Citation of related structures