Direct interaction of the human cytomegalovirus IE86 protein with the cis repression signal does not preclude TBP from binding to the TATA box.
The human cytomegalovirus major immediate-early gene encodes several protein isoforms which autoregulate the major immediate-early promoter (MIEP). One of these isoforms, the IE86 protein, represses the MIEP through a DNA sequence located between the TATA box and the transcription initiation site, designated the cis repression signal (crs). Through mutational analysis, amino acid domains within IE86 responsible for binding the crs element were located at the C terminus. Mutation of the putative zinc finger domain, which precluded IE86 from binding DNA, converted the protein from a repressor of MIEP transcription into an activator. DNase I protection analysis demonstrated that the IE86 footprint overlapped the sequence protected by the TATA-binding protein (TBP). Investigation of whether IE86 was able to displace TBP from DNA revealed that both proteins could bind DNA simultaneously. However, higher concentrations of IE86 were required to obtain protection of the crs element in the presence of prebound TBP. Similarly, higher concentrations of TBP were required to obtain protection in the presence of prebound IE86. These observations indicate that steric hinderance impairs but does not prevent both proteins from binding DNA synchronously.
Jupp
R
R
Department of Microbiology and Immunology, Oregon Health Sciences University, Portland 97201.
Hoffmann
S
S
Depto
A
A
Stenberg
R M
RM
Ghazal
P
P
Nelson
J A
JA
D001483:Base Sequence; D002478:Cells, Cultured; D003587:Cytomegalovirus / Q000235:genetics* / Q000378:metabolism*; D003850:Deoxyribonuclease I; D005814:Genes, Viral; D006801:Humans; D017874:Immediate-Early Proteins / Q000378:metabolism*; D016350:Leucine Zippers / Q000235:genetics; D008562:Membrane Glycoproteins; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D009838:Oligodeoxyribonucleotides; D017354:Point Mutation; D015183:Restriction Mapping; D016385:TATA Box; D035181:TATA-Box Binding Protein; D015534:Trans-Activators; D014162:Transfection; D014759:Viral Envelope Proteins; D014764:Viral Proteins / Q000378:metabolism*; D016335:Zinc Fingers / Q000235:genetics
C069186:IE2 protein, Cytomegalovirus; D017874:Immediate-Early Proteins; D008562:Membrane Glycoproteins; D009838:Oligodeoxyribonucleotides; D035181:TATA-Box Binding Protein; D015534:Trans-Activators; C077406:UL115 protein, Human herpesvirus 5; D014759:Viral Envelope Proteins; D014764:Viral Proteins; C071440:glycoprotein H, Cytomegalovirus; C499358:glycoprotein H, Human cytomegalovirus; C439068:glycoprotein O, cytomegalovirus; D003850:Deoxyribonuclease I