Multiple viral and host nucleotide-dependent processes

The term Multiple viral and host nucleotide-dependent processes refers to a collective set of biochemical pathways and enzymes involved in the metabolism and polymerization of nucleotides, which are essential for both cellular function and viral replication. This is not a single molecular target but rather a functional category often used to describe the broad-spectrum mechanism of action of drugs like Ribavirin (Graci & Cameron, 2006). The processes involved include host-side enzymes such as Inosine Monophosphate Dehydrogenase (IMPDH), which regulates the guanosine triphosphate (GTP) pool, and viral-side enzymes like RNA-dependent RNA polymerase (RdRp) (Thomas et al., 2011). By disrupting these multiple processes, therapeutic agents can inhibit viral RNA capping, suppress genome replication, and induce lethal mutagenesis, where the viral mutation rate is increased beyond a sustainable threshold (Crotty et al., 2000). While this multi-target approach is effective against a wide range of RNA viruses and reduces the likelihood of resistance, it often results in a narrow therapeutic index due to the essential nature of nucleotide metabolism in healthy host cells. Consequently, drugs targeting these processes are frequently associated with significant systemic toxicities, most notably hemolytic anemia (FDA Label, Rebetol).

Other names

Broad-spectrum antiviral mechanismsNucleotide metabolism pathwaysRibavirin multi-target mechanismHost and viral nucleotide synthesis

Inhibition of Inosine Monophosphate Dehydrogenase (IMPDH) to deplete GTP pools, inhibition of viral RNA-dependent RNA polymerase (RdRp), interference with viral mRNA capping, and induction of lethal mutagenesis in viral genomes.