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I03-Macromolecular Crystallography	Penicillin derivatives inhibit the SARS-COV-2 main protease by reaction with its nucleophilic cysteine Tika R. Malla , Lennart Brewitz , Dorian-Gabriel Muntean , Hiba Aslam , C. David Owen , Eidarus Salah , Anthony Tumber , Petra Lukacik , Claire Strain-Damerell , Halina Mikolajek , Martin Walsh , Christopher J. Schofield Journal Of Medicinal Chemistry 49 DOI: 10.1021/acs.jmedchem.1c02214 Diamond Proposal Number(s): [27088] Open Access Show Abstract ▼ Abstract: The SARS-CoV-2 main protease (Mpro) is a medicinal chemistry target for COVID-19 treatment. Given the clinical efficacy of β-lactams as inhibitors of bacterial nucleophilic enzymes, they are of interest as inhibitors of viral nucleophilic serine and cysteine proteases. We describe the synthesis of penicillin derivatives which are potent Mpro inhibitors and investigate their mechanism of inhibition using mass spectrometric and crystallographic analyses. The results suggest that β-lactams have considerable potential as Mpro inhibitors via a mechanism involving reaction with the nucleophilic cysteine to form a stable acyl–enzyme complex as shown by crystallographic analysis. The results highlight the potential for inhibition of viral proteases employing nucleophilic catalysis by β-lactams and related acylating agents.	May 2022

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