Human rhinovirus replication machinery

The Human rhinovirus (HRV) replication machinery is a multi-protein complex composed of viral non-structural proteins (2A, 2B, 2C, 3A, 3B, 3C, and 3D) and recruited host cell factors (Jacobs et al., 2013, Antiviral Res). This machinery is responsible for the replication of the viral positive-sense single-stranded RNA genome and the proteolytic processing of the viral polyprotein into functional units (UniProt P03303). Key enzymes within this complex include the 3C protease (3Cpro), which performs most of the polyprotein cleavages, and the 3D RNA-dependent RNA polymerase (3Dpol), which is the central engine for RNA synthesis (Rollinger and Schmidtke, 2011, Med Microbiol Immunol). Additionally, the 2A protease plays a critical role in hijacking host cell machinery by cleaving eukaryotic initiation factor 4G (eIF4G), leading to the shut-off of host protein synthesis. The 2C protein acts as an NTPase and helicase, facilitating membrane rearrangements and RNA binding during the replication cycle. Because these processes are essential for the viral life cycle and lack direct human homologs, the HRV replication machinery is a major focus for the development of antiviral therapies. Drugs like rupintrivir target the 3C protease to prevent polyprotein processing, while compounds like enviroxime target the 3A protein or its interaction with host PI4KB (Patick, 2006, Antiviral Res). Despite the potential of these targets, clinical development has been challenged by the high genetic diversity of HRV serotypes and the rapid emergence of resistance mutations.

Other names

HRV replicase complexHRV replication complexHRV non-structural proteinsHRV polyprotein processing complex

Inhibition of viral 3C protease activity, inhibition of RNA-dependent RNA polymerase, or disruption of host-viral protein interactions required for RNA synthesis.