Tylophorine analog DCB-3503 is a potential anticancer and immunosuppressive agent. DCB-3503 suppresses the translation of cellular regulatory proteins, including cyclin D1, at the elongation step. DCB-3503 allosterically regulates the ATPase and chaperone activities of HSC70 by promoting ATP hydrolysis in the presence of specific RNA binding motifs (AUUUA) of cyclin D1 mRNA.