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. 1986 Nov;83(22):8550–8554. doi: 10.1073/pnas.83.22.8550

Interaction of a nuclear factor with the polyomavirus enhancer region.

P Ostapchuk, J F Diffley, J T Bruder, B Stillman, A J Levine, P Hearing
PMCID: PMC386968  PMID: 3022296

Abstract

We have identified a factor present in nuclear extracts of undifferentiated F9 murine embryonal carcinoma cells that specifically interacts with the polyomavirus enhancer region. Nuclease "footprint" analysis was used to define the binding site that corresponds precisely to the boundaries of polyoma enhancer element C defined by Veldman et al. [Veldman, G. M., Lupton, S. & Kamen, R. (1985) Mol. Cell. Biol. 5, 649-658] that is required as an enhancer for efficient viral DNA replication and early and late region transcription. The region of nuclease protection contains a 6-base-pair inverted repeat, separated by 3 base pairs, and symmetrical flanking DNase I hypersensitive cleavage sites, suggesting that this factor may bind as a dimer. A cloned 29-base-pair polyoma DNA fragment contains an intact binding domain. Similar levels of binding activity were found in nuclear extracts prepared from differentiated murine F9 cells, as well as murine L cells and human HeLa cells. The factor has been termed "EF-C" for enhancer binding factor to polyoma element C.

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