Involved in both the initiation and regulation of meiosis, mitosis, and postmitotic functions in differentiated cells by phosphorylating a number of transcription factors such as ELK1. Participates in a signaling cascade initiated by activated KIT and KITLG/SCF. Phosphorylates EIF4EBP1; required for initiation of translation. Phosphorylates microtubule-associated protein 2 (MAP2). Phosphorylates SPZ1. Phosphorylates heat shock factor protein 4 (HSF4) and ARHGEF2.
Specificity
Natural and recombinant Rat Mitogen-activated protein kinase 1
Interacts with ARHGEF2, NISCH, MORG1 and HSF4 (By similarity). Interacts (phosphorylated form) with CAV2 ('Tyr-19'-phosphorylated form); the interaction, promoted by insulin, leads stlto nuclear location and MAPK1 activation. Interacts with ARRB2. Interacts with ADAM15 (By similarity). Interacts with NEK2.