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. 1993 Feb;67(2):1058–1066. doi: 10.1128/jvi.67.2.1058-1066.1993

NF-IL6 represses early gene expression of human papillomavirus type 16 through binding to the noncoding region.

S Kyo 1, M Inoue 1, Y Nishio 1, K Nakanishi 1, S Akira 1, H Inoue 1, M Yutsudo 1, O Tanizawa 1, A Hakura 1
PMCID: PMC237461  PMID: 8380454

Abstract

The expression of human papillomavirus type 16 (HPV16) early genes, including E6 and E7 transforming genes, is regulated by several cellular factors binding to the noncoding region (NCR), such as the glucocorticoid receptor, NF-I, and AP1, all of which are positive regulators. We demonstrated that the nuclear factor for interleukin 6 expression (NF-IL6) specifically binds to the HPV16 NCR ranging from nucleotides 7007 to 7766 and represses the early gene expression of HPV16. The responsive element in HPV16 NCR was determined within the region ranging from nucleotides 7454 to 7766. In this region, many binding sites for other cellular transactivators, such as NF-I and AP1, have been detected. Interestingly, three of seven binding sites for NF-I and two of two binding sites for AP1 in this region overlap with the putative NF-IL6 binding sites identified by computer analysis. Competition experiments with the oligonucleotides containing such NF-I or AP1 sites indicated that NF-IL6 certainly binds to them. Furthermore, in a chloramphenicol acetyltransferase assay using mutant NF-IL6 expression vectors, the DNA binding domain of NF-IL6 was shown to be necessary for repression, whereas the functional domain was not. These findings indicate that repression may be caused by competition with other transcriptional activators, such as NF-I and AP1. Thus, NF-IL6 may play a significant role in the regulation of viral transcription as a part of the host's resistance to viral infection.

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