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Identification of acrylamide-based covalent inhibitors of SARS-CoV-2 (SCoV-2) Nsp15 using high-throughput screening and machine learning

Bajaj et al., RSC Advances, doi:10.1039/d4ra06955b, Apr 2025
High-throughput screen of 2,640 acrylamide-based compounds, identifying 10 covalent inhibitors of SARS-CoV-2 Nsp15 with IC₅₀ values under 5 μM. Nsp15, an endoribonuclease vital for immune evasion, was targeted via its cysteine residues, with specificity confirmed over other cysteine-containing proteins. One compound was found to covalently modify Cys293 near the active site, as shown by mass spectrometry. These compounds also showed activity against Nsp15 from SARS-CoV-1 and MERS-CoV, but not against unrelated enzymes like RNase A and SIRT1. Despite promising in vitro activity, none of the compounds showed significant inhibition in live virus cell culture, likely due to limited potency. An AI model trained on experimental data achieved ~73% prediction accuracy for identifying potential Nsp15 inhibitors, accelerating the hit-to-lead process.
Bajaj et al., 3 Apr 2025, USA, peer-reviewed, 20 authors. Contact: bajajtiya@berkeley.edu, bmosavati@berkeley.edu, nmurthy@berkeley.edu.
In Vitro studies are an important part of preclinical research, however results may be very different in vivo.
Identification of acrylamide-based covalent inhibitors of SARS-CoV-2 (SCoV-2) Nsp15 using high-throughput screening and machine learning
Teena Bajaj, Babak Mosavati, Lydia H Zhang, Mohammad S Parsa, Huanchen Wang, Evan M Kerek, Xueying Liang, Seyed Amir Tabatabaei Dakhili, Eddie Wehri, Silin Guo, Rushil N Desai, Lauren M Orr, Mohammad R K Mofrad, Julia Schaletzky, John R Ussher, Xufang Deng, Robin Stanley, Basil P Hubbard, Daniel K Nomura, Niren Murthy
RSC Advances, doi:10.1039/d4ra06955b
Non-structural protein 15 (Nsp15) is a SARS-CoV-2 (SCoV-2) endoribonuclease and is a promising target for drug development because of its essential role in evading the host immune system. However, developing inhibitors against Nsp15 has been challenging due to its structural complexity and large RNA binding surface. In this report, we screened a 2640 acrylamide-based compound library against Nsp15 and identified 10 fragments that reacted with cysteine residues on Nsp15 and inhibited its endoribonuclease activity with IC 50 s less than 5 mM. These compounds had several attractive properties, such as low molecular weight (180-300 g mol -1 ), log P <3, zero violations to Lipinski's rules, and no apparent panassay interference (PAINs) properties. In addition, based on this data as a training set, we developed an artificial intelligence (AI) model that accelerated the hit to lead process and had a 73% accuracy for predicting new acrylamide-based Nsp15 inhibitors. Collectively, these results demonstrate that acrylamide fragments have great potential for developing Nsp15 inhibitors.
Author contributions Conflicts of interest There are no conicts to declare.
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