Nucleic Acids Research, 1983, Vol. 11, No. 8 2347-2365
© 1983
MOLECULAR BIOLOGY |
Functional analysis of a herpes simplex virus type 1 promoter: identification of far-upstream regulatory sequences
Medical Research Council Virology Unit, Institute of Virology Church Street, Glasgow Gil 5JR, UK
Received February 8, 1983. Accepted March 22, 1983.
We have performed a functional analysis of DNA sequences upstream from the gene for IE mRNA3 of herpes simplex virus type 1. Nucleotide sequences involved in initiation and positive regulation of transcription have been defined by construction of specific deletions in vitro. Transcription was assayed in vivo by microinjection into Xenopus oocytes, or by introduction of plasmid DNA into tissue culture cells and measurement of transient expression. Three functional promoter elements have been defined: i) Sequences between 16 and 37 which are not essential for transcription but are required for accurate initiation. ii) Proximal promoter sequences which are sufficient for transcription initiation in the absence of upstream sequences. iii) Far-upstream promoter sequences (more than 108bp upstream) which increase transcription in oocytes, and contain positive regulatory sequences (174 to 331) which respond strongly to a factor in the virus inoculum.
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