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. 1993 Nov;13(11):6810–6818. doi: 10.1128/mcb.13.11.6810

The major histocompatibility complex class II promoter-binding protein RFX (NF-X) is a methylated DNA-binding protein.

X Y Zhang 1, N Jabrane-Ferrat 1, C K Asiedu 1, S Samac 1, B M Peterlin 1, M Ehrlich 1
PMCID: PMC364743  PMID: 8413274

Abstract

A mammalian protein called RFX or NF-X binds to the X box (or X1 box) in the promoters of a number of major histocompatibility (MHC) class II genes. In this study, RFX was shown to have the same DNA-binding specificity as methylated DNA-binding protein (MDBP), and its own cDNA was found to contain a binding site for MDBP in the leader region. MDBP is a ubiquitous mammalian protein that binds to certain DNA sequences preferentially when they are CpG methylated and to other related sequences, like the X box, irrespective of DNA methylation. MDBP from HeLa and Raji cells formed DNA-protein complexes with X-box oligonucleotides that coelectrophoresed with those containing standard MDBP sites. Furthermore, MDBP and X-box oligonucleotides cross-competed for the formation of these DNA-protein complexes. DNA-protein complexes obtained with MDBP sites displayed the same partial supershifting with an antiserum directed to the N terminus of RFX seen for complexes containing an X-box oligonucleotide. Also, the in vitro-transcribed-translated product of a recombinant RFX cDNA bound specifically to MDBP ligands and displayed the DNA methylation-dependent binding of MDBP. RFX therefore contains MDBP activity and thereby also EF-C, EP, and MIF activities that are indistinguishable from MDBP and that bind to methylation-independent sites in the transcriptional enhancers of polyomavirus and hepatitis B virus and to an intron of c-myc.

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