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  • American Society for Microbiology  (2)
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  • American Society for Microbiology  (2)
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  • 1
    Online Resource
    Online Resource
    American Society for Microbiology ; 1991
    In:  Journal of Virology Vol. 65, No. 12 ( 1991-12), p. 6922-6930
    In: Journal of Virology, American Society for Microbiology, Vol. 65, No. 12 ( 1991-12), p. 6922-6930
    Abstract: The human papillomavirus E7 gene product is an oncoprotein with properties similar to those of the adenovirus E1A proteins. The human papillomavirus E7 proteins possess substantial amino acid sequence similarity to portions of conserved regions 1 and 2 of E1A, and the human papillomavirus type 16 E7 protein trans-activates the adenovirus E2 early promoter. Analysis of point mutations in the E2 promoter indicated that the E2F recognition sites were critical to E7 stimulation. In contrast to the activation of the E2 promoter, E7 could not trans-activate various other E1A-inducible promoters. Although the promoter specificity for E7 differs from that of 13S E1A trans activation, it is very similar to activation by the E1A 12S product. Moreover, analysis of the E7 protein has suggested that amino acid sequences critical for trans activation include those shared with E1A within conserved region 2. Biochemical studies demonstrate that the E7 protein, like the 12S E1A product, can alter the interaction of cellular factors with the E2F transcription factor. We therefore conclude that E7 trans activation is functionally related to that mediated by the 12S E1A product.
    Type of Medium: Online Resource
    ISSN: 0022-538X , 1098-5514
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 1991
    detail.hit.zdb_id: 1495529-5
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  • 2
    Online Resource
    Online Resource
    American Society for Microbiology ; 1991
    In:  Journal of Virology Vol. 65, No. 7 ( 1991-07), p. 3547-3552
    In: Journal of Virology, American Society for Microbiology, Vol. 65, No. 7 ( 1991-07), p. 3547-3552
    Abstract: Adenovirus E1A-dependent trans activation of the adenovirus E2 gene involves the activation of the cellular transcription factor E2F. E2F binding sites have also been identified in the 5'-flanking region of a number of cellular genes, raising the possibility that such genes are targets for E1A trans activation. We now demonstrate that two genes that possess E2F recognition sites, N-myc and DHFR, are stimulated by E1A, dependent on the E2F sites. We also find that although there are multiple E2F sites in these promoters, a single intact E2F binding site is sufficient for E1A-mediated induction, although not to the full wild-type level. These results thus demonstrate that a variety of cellular genes that possess E2F binding sites are subject to E1A trans activation. Moreover, since the products of most of these genes are likely critical for cellular proliferation, there are obvious consequences of this trans activation for cellular phenotype.
    Type of Medium: Online Resource
    ISSN: 0022-538X , 1098-5514
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 1991
    detail.hit.zdb_id: 1495529-5
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
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