NCI Drug Dictionary

The NCI Drug Dictionary contains technical definitions and synonyms for drugs/agents used to treat patients with cancer or conditions related to cancer. Each drug entry includes links to check for clinical trials listed in NCI's List of Cancer Clinical Trials.

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protein arginine methyltransferase 5 inhibitor PRT543
An orally available small molecule inhibitor of protein arginine methyltransferase 5 (PRMT5), with potential antiproliferative and antineoplastic activities. Although the exact mechanism of action has not been completely determined, upon oral administration, PRMT5 inhibitor PRT543 selectively binds to the substrate recognition site of PRMT5 and inhibits its methyltransferase activity. This decreases the levels of both monomethylated and dimethylated arginine residues in histones H2A, H3 and H4 and modulates the expression of genes involved in several cellular processes, including cellular proliferation. As a result, PRT543 may increase the expression of antiproliferative genes and/or decrease the expression of genes that promote cell proliferation, which may lead to decreased growth of rapidly proliferating cells, including cancer cells. PRTM5, an arginine methyltransferase that catalyzes the formation of both omega-N monomethylarginine (MMA) and symmetric dimethylarginine (sDMA) on histones and a variety of other protein substrates, is overexpressed in several neoplasms. Check for active clinical trials using this agent. (NCI Thesaurus)

Synonym:PRMT5 inhibitor PRT543
Code name:PRT 543
PRT543
PRT-543