Human cytomegalovirus immediate early proteins and cell growth control
Biochemistry & Molecular Pharmacology
Graduate School of Biomedical Sciences; Department of Molecular Genetics and Microbiology
Medical Subject Headings
Apoptosis; Cell Cycle; Cytomegalovirus; Eukaryotic Cells; Humans; Immediate-Early Proteins; Tumor Suppressor Protein p53; Virus Replication
Life Sciences | Medicine and Health Sciences
It is widely accepted that small DNA tumor viruses, such as adenovirus, simian virus 40 and papillomavirus, push infected cells into S-phase to facilitate the replication of their genome. Until recently, it was believed that the large DNA viruses (i.e. herpesviruses) functioned very differently in this regard by inducing a G(1) arrest in infected cells as part of their replication process. However, studies over the last 6-8 years have uncovered striking parallels (and differences) between the functions of the major immediate early (IE) proteins of at least one herpesvirus, human cytomegalovirus (HCMV) and IE equivalents encoded by small DNA tumor viruses, such as adenovirus. Similarities between the HCMV major IE proteins and adenovirus IE proteins include targeting of members of the RB and p53 families and an ability of these viral factors to induce S-phase in quiescent cells. However, unlike the small DNA tumor virus proteins, individual HCMV IE proteins target different RB family members. HCMV also encodes several other IE gene products as well as virion tegument proteins that act early during infection to prevent an infected cell from replicating its host genome and from undergoing apoptosis. Here, we review the specifics of several HCMV IE proteins, two virion components, and their functions in relation to cell growth control.
Rights and Permissions
Citation: Gene. 2002 May 15;290(1-2):19-34
Castillo, Jonathan Patrick and Kowalik, Timothy F., "Human cytomegalovirus immediate early proteins and cell growth control" (2002). GSBS Student Publications. 190.