Characterization of an NF-1/CTF family member as a functional activator of the mouse mammary tumor virus long terminal repeat 5' enhancer.

The Journal of Biological Chemistry
P KuskG L Hager

Abstract

The long terminal repeat of the mouse mammary tumor virus restricts virus expression primarily to the mammary epithelium. The extreme 5' end of the long terminal repeat contains an enhancer that has been associated with tissue-specific expression of the virus. A total of six functional cis-acting elements have been identified in the enhancer. Although proteins binding to these elements have been reported, only one has been identified; this factor, mp5, is identical or closely related to the transcription factor AP-2 (Mellentin-Michelotti, J., John, S., Pennie, W. D., Williams, T., and Hager, G. L. (1994) J. Biol. Chem. 269, 31983-31990). The other factors are hitherto unidentified and poorly described. We report here the characterization of another of the six elements, previously referred to as the F3 site (Mink, S., Hartig, E., Jennewein, P., Doppler, W., and Cato, A. C. (1992) Mol. Cell Biol. 12, 4906-4918). We show that the F3 binding activity and AP-2 act synergistically to enhance mouse mammary tumor virus-directed transcription, but only in the presence of glucocorticoid hormone. The F3 element has an NF-1-like half-site, but the activity recognizing this element has binding characteristics distinct from the NF-1/CTF fami...Continue Reading

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Citations

Mar 4, 2000·The EMBO Journal·S BelikovO Wrange
Aug 8, 1998·The Journal of Biological Chemistry·H TorranceR J Haché
Apr 23, 1999·The Journal of Biological Chemistry·D W Cooke, M D Lane
Nov 13, 1998·Journal of Virology·S L Grimm, S K Nordeen

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