Differential control of transcription by homologous homeodomain coregulators.
The human herpes simplex virus type 1 (HSV-1) transactivator VP16 and its homolog from bovine herpes-virus 1 (BHV-1) can each recruit the human homeodomain protein Oct-1 into a transcriptional regulatory complex. Here, we show that these two Oct-1 coregulators possess similar, if not identical, homeodomain recognition properties but possess different virus-specific cis-regulatory specificities: the HSV-1 VP-16 protein activates transcription from the HSV-1 VP16 response element, and the BHV-1 VP16 protein activates transcription from the BHV-1 VP16 response element. A distinct 3-bp segment, the D segment, lying 3' of the canonical TAATGARAT motif (where R is a purine) in the VP16 response element is responsible for the differential cis element recognition and transcriptional activation by these two homeodomain coregulators. These results demonstrate how a single homeodomain protein can direct differential transcriptional regulation by selective association with homologous homeodomain coregulators.
Huang
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CC
Cold Spring Harbor Laboratory, New York 11724, USA.
Herr
W
W
D000818:Animals; D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D002417:Cattle; D016384:Consensus Sequence; D004279:DNA, Viral / Q000235:genetics / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D005809:Genes, Regulator; D005814:Genes, Viral; D006367:HeLa Cells; D007242:Herpesvirus 1, Bovine / Q000235:genetics*; D018259:Herpesvirus 1, Human / Q000235:genetics*; D018398:Homeodomain Proteins / Q000235:genetics* / Q000378:metabolism; D051863:Host Cell Factor C1; D006801:Humans; D008969:Molecular Sequence Data; D050811:Octamer Transcription Factor-1; D050813:Octamer Transcription Factor-2; D015534:Trans-Activators / Q000235:genetics* / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism; D014158:Transcription, Genetic
D004279:DNA, Viral; D004268:DNA-Binding Proteins; C497692:HCFC1 protein, human; D018398:Homeodomain Proteins; D051863:Host Cell Factor C1; D050811:Octamer Transcription Factor-1; D050813:Octamer Transcription Factor-2; C494165:POU2F1 protein, human; C058435:POU2F2 protein, human; D015534:Trans-Activators; D014157:Transcription Factors