Mpro - Best

The , also referred to as 3CLpro (3-chymotrypsin-like protease) or nsp5 , is a critical enzyme required for the replication and survival of coronaviruses, most notably SARS-CoV-2 . Because it plays an indispensable role in the viral life cycle and lacks a close human equivalent, it has become one of the most significant targets for antiviral drug development. Biological Function and Mechanism Mpro is responsible for processing large polyproteins ( pp1ap p 1 a pp1abp p 1 a b

) translated from the viral genome into individual, functional non-structural proteins (nsps). The , also referred to as 3CLpro (3-chymotrypsin-like

: The protease cleaves the polyprotein at at least 11 conserved sites , releasing essential proteins that form the viral replication-transcription complex. : The protease cleaves the polyprotein at at

: Mpro is unique in that it first cleaves itself out of the polyprotein chain (autoproteolysis) before it begins processing other sites. This dimerization is essential for its catalytic activity

Mpro typically exists as a , meaning it consists of two identical protein subunits. This dimerization is essential for its catalytic activity .