Discoidin domain-containing receptor 1/2 (DDR1/2) are receptor tyrosine kinases (RTKs) whose activating ligands are various collagens [1,2] and consist of extracellular domains comprising the N-terminal discoidin domain (DS, Pfam:PF00754) followed by a DS-like domain and the cytoplasmic kinase domain (Pfam:PF07714) 1-3]. Impairment in signaling by DDR1 and DDR2 is associated with the progression of various human diseases, including fibrosis, atherosclerosis and cancer, therefore, inhibition of signaling using monoclonal antibodies (mAbs) may be an useful therapy. This entry represents the DS-like domain, which mediates binding to triple-helical collagen together with the DS domain and contains the epitopes of all mAbs [2].

1: Structure of the discoidin domain receptor 1 extracellular region bound to an inhibitory Fab fragment reveals features important for signaling. Carafoli F, Mayer MC, Shiraishi K, Pecheva MA, Chan LY, Nan R, Leitinger B, Hohenester E; Structure. 2012;20:688-697. PMID:22483115

2: What Makes a Kinase Promiscuous for Inhibitors?. Hanson SM, Georghiou G, Thakur MK, Miller WT, Rest JS, Chodera JD, Seeliger MA; Cell Chem Biol. 2019;26:390-399. PMID:30612951