Transcriptional regulation of the open reading frame 35 encoded by Kaposi's sarcoma-associated herpesvirus.
Kaposi's sarcoma-associated herpesvirus (KSHV) is a member of the Gammaherpesvirinae and is causally associated with Kaposi's sarcoma, primary effusion lymphoma, and multicentric Castleman's disease. The KSHV genome encodes over 85 genes; the function of some is entirely unknown. We have characterized the transcriptional regulation of a conserved and uncharacterized Gammaherpesvirinae open reading frame, orf35, which lies in a cluster of several overlapping genes, orf34 to orf38. We identified the transcription start site and analyzed upstream sequences. We found that expression of the KSHV lytic replication and transcription activator (RTA) strongly increased the orf35 promoter activity through a 46-nucleotide region which includes a conserved AP-1 binding site. Electrophoretic mobility shift assay demonstrated direct binding of cJUN and cFOS to the predicted AP-1 binding site. Finally, using a mutated promoter lacking the AP-1 site and dominant-negative cFOS, we established that the RTA-mediated orf35 transactivation is AP-1-dependent.
Masa
Shiri-Rivka
SR
The Mina and Everard Goodman Faculty of Life Sciences, Bar Ilan University, Ramat-Gan, 52900, Israel.
Lando
Revital
R
Sarid
Ronit
R
D000595:Amino Acid Sequence; D001483:Base Sequence; D001665:Binding Sites; D002460:Cell Line; D016000:Cluster Analysis; D018076:DNA, Complementary; D015967:Gene Expression Regulation, Viral; D049452:Green Fluorescent Proteins / Q000378:metabolism; D019288:Herpesvirus 8, Human / Q000235:genetics*; D006801:Humans; D007668:Kidney / Q000166:cytology; D007700:Kinetics; D054685:Lymphoma, Primary Effusion / Q000473:pathology; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D010957:Plasmids; D011401:Promoter Regions, Genetic; D016760:Proto-Oncogene Proteins c-fos / Q000378:metabolism; D016755:Proto-Oncogene Proteins c-jun / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D015534:Trans-Activators; D018808:Transcription Factor AP-1 / Q000378:metabolism; D024363:Transcription Initiation Site; D014158:Transcription, Genetic; D014162:Transfection; D014764:Viral Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism
D018076:DNA, Complementary; D016760:Proto-Oncogene Proteins c-fos; D016755:Proto-Oncogene Proteins c-jun; D011993:Recombinant Fusion Proteins; D015534:Trans-Activators; D018808:Transcription Factor AP-1; D014764:Viral Proteins; D049452:Green Fluorescent Proteins