1. Academic Validation
  2. Discovery of CMX990: A Potent SARS-CoV-2 3CL Protease Inhibitor Bearing a Novel Warhead

Discovery of CMX990: A Potent SARS-CoV-2 3CL Protease Inhibitor Bearing a Novel Warhead

  • J Med Chem. 2024 Feb 22;67(4):2369-2378. doi: 10.1021/acs.jmedchem.3c01938.
N G R Dayan Elshan 1 Karen C Wolff 1 Laura Riva 1 Ashley K Woods 1 Gennadii Grabovyi 1 Katy Wilson 1 James Pedroarena 1 Sourav Ghorai 1 Armen Nazarian 1 Frank Weiss 1 Yuyin Liu 1 Wrickban Mazumdar 1 Lirui Song 1 Neechi Okwor 1 Jacqueline Malvin 1 Malina A Bakowski 1 Nathan Beutler 2 Melanie G Kirkpatrick 1 Amal Gebara-Lamb 1 Edward Huang 1 Vân T B Nguyen-Tran 1 Victor Chi 1 Shuangwei Li 1 Thomas F Rogers 2 Case W McNamara 1 Anil Kumar Gupta 1 Alireza Rahimi 1 Jian Jeffrey Chen 1 Sean B Joseph 1 Peter G Schultz 1 3 Arnab K Chatterjee 1
Affiliations

Affiliations

  • 1 Calibr at Scripps Research Institute, 11119 North Torrey Pines Road, La Jolla, California 92037, United States.
  • 2 Department of Immunology and Microbiology, The Scripps Research Institute, 10466 North Torrey Pines Road, La Jolla, California 92037, United States.
  • 3 Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States.
Abstract

There remains a need to develop novel SARS-CoV-2 therapeutic options that improve upon existing therapies by an increased robustness of response, fewer safety liabilities, and global-ready accessibility. Functionally critical viral main Protease (Mpro, 3CLpro) of SARS-CoV-2 is an attractive target due to its homology within the coronaviral family, and lack thereof toward human proteases. In this disclosure, we outline the advent of a novel SARS-CoV-2 3CLpro inhibitor, CMX990, bearing an unprecedented trifluoromethoxymethyl ketone warhead. Compared with the marketed drug nirmatrelvir (combination with ritonavir = Paxlovid), CMX990 has distinctly differentiated potency (∼5× more potent in primary cells) and human in vitro clearance (>4× better microsomal clearance and >10× better hepatocyte clearance), with good in vitro-to-in vivo correlation. Based on its compelling preclinical profile and projected once or twice a day dosing supporting unboosted oral therapy in humans, CMX990 advanced to a Phase 1 clinical trial as an oral drug candidate for SARS-CoV-2.

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