Non-structural protein 13 (Nsp13) (Nsp13)

The SARS-CoV-2 Non-structural protein 13 (Nsp13) is a highly conserved enzyme essential for the replication and transcription of the viral genome [5, 7]. As a member of the helicase superfamily 1B, Nsp13 utilizes the energy derived from ATP hydrolysis to unwind double-stranded RNA or DNA in a 5' to 3' direction [1, 10]. Beyond its helicase activity, it possesses nucleoside triphosphate hydrolase (NTPase) and RNA 5' triphosphatase activities, the latter of which is critical for the formation of the viral mRNA cap structure [8, 14]. Nsp13 also plays a role in evading the host immune response by antagonizing interferon production and interacting with host proteins like EWSR1 to facilitate viral propagation [9, 12]. Due to its indispensable role in the viral life cycle and high sequence conservation across coronavirus variants, Nsp13 is a primary target for the development of broad-spectrum antiviral therapies [4, 13]. Current drug discovery efforts focus on small molecule inhibitors, such as SSYA10-001 and repurposed drugs like Cepharanthine, which target the ATP-binding pocket or allosteric sites to block its enzymatic functions [2, 5, 12].

Other names

Non-structural protein 13NSP13SARS-CoV-2 helicaseRNA helicase Nsp13NTPase Nsp135'-to-3' RNA helicase

Inhibition of helicase-mediated RNA unwinding and NTPase activity by targeting the ATP-binding pocket or allosteric sites [2, 5, 8].