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Molecular basis of ALK1-mediated signalling by BMP9/BMP10 and their prodomain-bound forms.

Published version
Peer-reviewed

Type

Article

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Authors

Wood, Jennifer H 
Beech, John S 

Abstract

Activin receptor-like kinase 1 (ALK1)-mediated endothelial cell signalling in response to bone morphogenetic protein 9 (BMP9) and BMP10 is of significant importance in cardiovascular disease and cancer. However, detailed molecular mechanisms of ALK1-mediated signalling remain unclear. Here, we report crystal structures of the BMP10:ALK1 complex at 2.3 Å and the prodomain-bound BMP9:ALK1 complex at 3.3 Å. Structural analyses reveal a tripartite recognition mechanism that defines BMP9 and BMP10 specificity for ALK1, and predict that crossveinless 2 is not an inhibitor of BMP9, which is confirmed by experimental evidence. Introduction of BMP10-specific residues into BMP9 yields BMP10-like ligands with diminished signalling activity in C2C12 cells, validating the tripartite mechanism. The loss of osteogenic signalling in C2C12 does not translate into non-osteogenic activity in vivo and BMP10 also induces bone-formation. Collectively, these data provide insight into ALK1-mediated BMP9 and BMP10 signalling, facilitating therapeutic targeting of this important pathway.

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Keywords

Journal Title

Nature communications

Conference Name

Journal ISSN

2041-1723

Volume Title

11

Publisher

Sponsorship
British Heart Foundation (PG/15/39/31519, PG/12/54/29734, PG/17/1/32532)