Human cytomegalovirus virulence factor proteins (HCMV virulence factors)

Human cytomegalovirus (HCMV) virulence factor proteins are a diverse group of viral gene products essential for the virus's ability to infect host cells, replicate its genome, and evade the host immune system. This functional class includes key enzymes such as the viral DNA polymerase (UL54) and the pUL97 protein kinase, as well as the viral terminase complex (UL56/UL89/UL104) and various envelope glycoproteins like gB (UL55) and the pentameric complex (gH/gL/UL128-131A). These proteins facilitate critical stages of the viral life cycle, including cell entry into diverse tissues, genome replication, and the packaging of viral DNA into capsids. They also play significant roles in establishing lifelong latency and promoting inflammation in infected tissues. Clinically, these proteins are the primary targets for anti-HCMV drugs; for example, ganciclovir and foscarnet inhibit the DNA polymerase, while letermovir targets the terminase complex and maribavir inhibits the pUL97 kinase. Resistance to these therapies often arises through mutations in the genes encoding these virulence factors, which remains a major challenge in the management of HCMV-associated diseases in immunocompromised patients and neonates.

Other names

HCMV pathogenicity factorsCytomegalovirus virulence genesHCMV viral proteinsHCMV replication proteins

Inhibition of viral DNA polymerase (UL54), inhibition of viral protein kinase pUL97, and inhibition of the viral terminase complex (UL56/UL89/UL104).