Hepatitis C virus replication complex (null)

The Hepatitis C virus replication complex is a dynamic multi-protein assembly formed primarily by viral nonstructural proteins NS3, NS4A, NS4B, NS5A, and NS5B in association with modified host cell membranes, principally the endoplasmic reticulum[1][4][7]. This complex orchestrates the synthesis and amplification of the viral RNA genome, marked by processes of proteolytic polyprotein processing (NS3/4A protease), RNA unwinding (NS3 helicase), and RNA polymerization (NS5B RNA polymerase), as well as cofactor and regulatory functions (NS4A, NS4B, NS5A)[1][3][4]. It is the central target for highly effective direct-acting antiviral therapies (DAAs) that have transformed HCV treatment by specifically inhibiting its critical enzymatic activities[6][9]. The replication complex is essential for persistent infection and disease progression, and is not found in uninfected cells, making it a selective and rational drug target[1][3][9].

Other names

HCV replication complexHCV replicase complexNonstructural protein complex of HCV (sometimes used to denote NS3-NS5B protein complex)

Inhibition of protease activity (prevents polyprotein cleavage, blocking viral protein maturation); Inhibition of RNA-dependent RNA polymerase (blocks HCV RNA synthesis); Inhibition of NS5A phosphoprotein (disrupts RNA replication and virus assembly)