Human cytomegalovirus virulence factors (HCMV virulence factors)

Human cytomegalovirus (HCMV) virulence factors are a collection of viral proteins that are essential for the virus's ability to replicate, spread, and persist within a host. These factors include the UL54 DNA polymerase, which synthesizes viral DNA, and the UL97 protein kinase, which is necessary for viral egress and the activation of certain antiviral agents (StatPearls, 2023). Another critical virulence factor is the viral terminase complex (comprising UL56, UL89, and UL51), which facilitates the cleavage and packaging of viral DNA into capsids (FDA, 2017). Additionally, HCMV encodes proteins such as US2, US3, US6, and US11 that actively subvert the host's immune response by downregulating MHC class I and II molecules (UniProt). Because these proteins are vital for the viral life cycle and differ significantly from human proteins, they serve as the primary targets for antiviral drugs like ganciclovir, letermovir, and maribavir (NEJM, 2021). Inhibition of these factors is the cornerstone of managing CMV disease in immunocompromised populations, such as transplant recipients and HIV patients.

Other names

HCMV proteinsHHV-5 virulence factorsCytomegalovirus pathogenicity factorsHCMV gene products

Inhibition of viral DNA polymerase (UL54), inhibition of viral terminase complex (UL56), and inhibition of viral protein kinase (UL97).