Hepatitis C virus replication complex (HCV RC) (HCV RC)

The Hepatitis C virus (HCV) RNA replication machinery is a specialized membrane-associated complex responsible for the synthesis of the viral RNA genome within host hepatocytes [1]. This complex, often termed the replication complex (RC), assembles on a modified endoplasmic reticulum structure known as the membranous web [2]. It consists of several non-structural (NS) proteins, including the NS3/4A protease-helicase, the NS4B membrane organizer, the NS5A phosphoprotein, and the NS5B RNA-dependent RNA polymerase [3]. These proteins work in concert with host factors, such as cyclophilin A and microRNA-122, to facilitate efficient viral replication [4]. Chronic infection by HCV leads to progressive liver damage, including fibrosis, cirrhosis, and hepatocellular carcinoma, making this machinery a critical therapeutic target [5]. Direct-acting antivirals (DAAs) specifically target components of this machinery, such as NS3/4A, NS5A, and NS5B, to halt viral production [6]. The use of combination DAA therapy has transformed Hepatitis C from a chronic, life-threatening condition into a curable infection for the vast majority of patients [7]. Resistance-associated substitutions (RASs) within the genes encoding these proteins can impact drug efficacy, necessitating genotype-specific or pangenotypic treatment regimens [8].

Other names

HCV RNA replication machineryHCV replication complexHCV RCHCV replicaseMembranous webHCV non-structural protein complex

The machinery is targeted by direct-acting antivirals that inhibit the NS3/4A serine protease to prevent polyprotein cleavage, the NS5A protein to disrupt replication complex assembly and viral signaling, and the NS5B RNA-dependent RNA polymerase to cause premature termination of viral RNA synthesis.