Transactivation of the cytomegalovirus ICP36 gene promoter requires the alpha gene product TRS1 in addition to IE1 and IE2.
Very little is known about the human cytomegalovirus functions that activate gamma (late) gene expression. We have investigated the regulation of the human cytomegalovirus gamma gene encoding the ICP36 major late DNA-binding protein family (UL44). Transactivation of the ICP36 gene promoter was found to be absolutely dependent on the trs1 gene product when expressed in cells in conjunction with ie1 and ie2 gene products. Transactivation occurred poorly or not at all when any one of these three transactivators was omitted. TRS1 is a member of the US22 family of proteins and is encoded by a region near the L-S junction of the viral genome within the c repeat and adjacent Us sequences. TRS1 is highly homologous to IRS1, which is encoded from the other copy of the c repeat, and plasmid constructs carrying the irs1 gene were also able to mediate transactivation of the ICP36 promoter. RNA blot analysis of steady-rate RNA throughout infection showed that the trs1 transcript was expressed with the kinetics of an alpha gene but its accumulation was delayed relative to that of ie1 and ie2 transcripts. On the basis of these experiments, TRS1 and IRS1 are proposed to be important intermediaries in the cascade of cytomegalovirus gene expression.
Stasiak
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PC
Department of Microbiology and Immunology, Stanford University School of Medicine, California 94305-5402.
Mocarski
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ES
D001483:Base Sequence; D002478:Cells, Cultured; D003001:Cloning, Molecular; D003513:Cycloheximide / Q000494:pharmacology; D003587:Cytomegalovirus / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics*; D015967:Gene Expression Regulation, Viral; D005814:Genes, Viral; D016679:Genome, Viral; D006801:Humans; D017874:Immediate-Early Proteins / Q000235:genetics*; D007700:Kinetics; D008562:Membrane Glycoproteins; D008969:Molecular Sequence Data; D009838:Oligodeoxyribonucleotides; D011401:Promoter Regions, Genetic; D012313:RNA / Q000235:genetics / Q000302:isolation & purification; D012367:RNA, Viral / Q000235:genetics / Q000302:isolation & purification; D015183:Restriction Mapping; D016385:TATA Box; D015534:Trans-Activators; D014158:Transcription, Genetic / Q000187:drug effects; D015533:Transcriptional Activation; D014759:Viral Envelope Proteins; D014763:Viral Matrix Proteins / Q000235:genetics; D014764:Viral Proteins / Q000235:genetics* / Q000378:metabolism; D001616:beta-Galactosidase / Q000235:genetics / Q000378:metabolism
D004268:DNA-Binding Proteins; C072217:ICP36 protein, Cytomegalovirus; C088645:IE1 protein, cytomegalovirus; C069186:IE2 protein, Cytomegalovirus; D017874:Immediate-Early Proteins; D008562:Membrane Glycoproteins; D009838:Oligodeoxyribonucleotides; D012367:RNA, Viral; C072216:TRS1 protein, Human herpesvirus 5; D015534:Trans-Activators; C077406:UL115 protein, Human herpesvirus 5; D014759:Viral Envelope Proteins; D014763:Viral Matrix Proteins; D014764:Viral Proteins; C071440:glycoprotein H, Cytomegalovirus; C499358:glycoprotein H, Human cytomegalovirus; C439068:glycoprotein O, cytomegalovirus; D012313:RNA; D003513:Cycloheximide; D001616:beta-Galactosidase