forkhead associated (FHA) domain found in the Ras-associating and dilute domain-containing protein (Radil)-like family
The Radil-like family includes Radil and Ras-interacting protein 1 (Rain). Radil acts as an important small GTPase Rap1 effector required for cell spreading and migration. It regulates neutrophil adhesion and motility by linking Rap1 to beta2-integrin activation. Rain, also called Rasip1, is an endothelial-specific Ras-interacting protein required for the proper formation of vascular structures that develop via both vasculogenesis and angiogenesis. It acts as a critical and vascular-specific regulator of GTPase signaling, cell architecture, and adhesion, which is essential for endothelial cell morphogenesis and blood vessel tubulogenesis. Rain interacts with Ras in a GTP-dependent manner and may serve as an effector for endomembrane-associated Ras. Both Radil and Rain contain an FHA domain. The FHA domain is a small phosphopeptide recognition module, but this group may lack the conserved residues that are required for binding phosphothreonine.
Jiyao W et al.(2023). "The conserved domain database in 2023.",