Research Progress on Small-molecule Inhibitors of Protein Arginine Methyltransferase 5 (PRMT5) for Treating Cancer

The protein arginine methyltransferase family includes nine members, with PRMT5 being the major type II arginine methyltransferase. PRMT5 is upregulated in a variety of tumors and promotes tumorigenesis and tumor cell proliferation and metastasis, making it a potential tumor therapy target. Recently, PRMT5 inhibitor research and development have become hotspots in the tumor therapy field.We classified and summarized PRMT5 inhibitors according to different binding mechanisms. We mainly analyzed the structure, biological activity, and binding interactions of PRMT5 inhibitors with the PRMT5 enzyme.At present, many PRMT5 inhibitors with various mechanisms of action have been reported, including substrate-competitive inhibitors, SAM-competitive inhibitors, dual substrate-/SAMcompetitive inhibitors, allosteric inhibitors, PRMT5 degraders, MTA-cooperative PRMT5 inhibitors and PPI inhibitors.These inhibitors are beneficial to the treatment of tumors. Some drugs are being used in clinical trials. PRMT5 inhibitors have broad application prospects in tumor therapy.