Nucleic Acids Research, 1992, Vol. 20, No. 10 2427-2434
© 1992
MOLECULAR BIOLOGY |
Members of the rel/NF-
B family of transcriptional regulatory proteins bind the HRAS1 minisatellite DNA sequence
1Department of Medicine (Hematology/Oncology), New England Medical Center Hospitals Boston, MA 02111, USA 2Graduate Program in Immunology, Tufts University School of Medicine Boston, MA 02111, USA 3Department of Molecular Biology and Microbiology, Tufts University School of Medicine Boston, MA 02111, USA
* To whom correspondence should be addressed at Box 245, NEMCH, 750 Washington Street, Boston, MA 02111, USA
Received March 19, 1992. Revised April 23, 1992. Accepted April 23, 1992.
The 28 base pair repeat unit of a minisatellite 1000 bp downstream from the human HRAS1 gene (VTRHRAS1) bound four proteins (p45, p50, p72 and p85) in nuclear extracts from a variety of human cell lines which were indistinguishable from several members of the rel/NF-
B family of transcriptional regulatory factors. VTRHRAS1 bound the constitutively expressed, but not the inducible, forms of these proteins. Analysis of partially purified binding factors from different cell lines demonstrated qualitative differences in the p50 subunit; phosphocellulose fractionation also revealed considerable heterogeneity in the p72 and p85 subunits. These results suggest the possibility that the HRAS1 minisatellite, in serving as a tandem array of rel/NF-B binding sites, may function in the transcriptional regulation of HRAS1 and nearby genes.
+ Present address: The Biological Laboratories, Harvard University, Cambridge, MA, USA
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