SAM Pointed domain of ETS-1 subfamily of ETS transcriptional activators is a protein-protein interaction domain. The ETS-1 activator is regulated by phosphorylation. It contains a docking site for the ERK2 MAP (Mitogen Activated Protein) kinase, while the ERK2 phosphorylation site is located in the N-terminal disordered region upstream of the SAM Pointed domain. Mutations of the kinase docking site residues inhibit phosphorylation. ETS-1 activators play a role in a number of different physiological processes, and they are expressed during embryonic development, including blood vessel formation, hematopoietic, lymphoid, neuronal and osteogenic differentiation. The Ets-1 gene is a proto-oncogene involved in progression of different tumors (including breast cancer, meningioma, and prostate cancer). Members of this subfamily are potential molecular targets for selective cancer therapy.
Comment:Kinase docking site is composed of a three hydrophobic residues. Mutations of these residues inhibit phosphorylation in vitro and impair Ras-MARK pathway-mediated enhancement of transactivation by ETS-1 in cell culture assays.
Jiyao W et al.(2023). "The conserved domain database in 2023.",