Enables RNA polymerase II-specific DNA-binding transcription factor binding activity; protein kinase binding activity; and signaling adaptor activity. Involved in several processes, including granulocyte colony-stimulating factor signaling pathway; positive regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction; and positive regulation of protein import into nucleus. Located in cytosol; nucleus; and plasma membrane. Part of transcription regulator complex. [provided by Alliance of Genome Resources, Jul 2025]