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ELP, the embryonal LTR binding protein, is a member of the nuclear receptor superfamily and a mouse homologue of Drosophila FTZ-F1. ELP is expressed specifically in undifferentiated mouse embryonal carcinoma cells and participates in suppression of the Moloney murine leukemia virus genome. The zinc finger domain of the protein was fused with glutathione S-transferase and was successfully used for isolating genomic targets. Sixteen genomic fragments were isolated and twelve of them strongly interacted with ELP. Six of the ELP binding fragments were analyzed further. All of these contained the multiple binding sites for ELP, which matched well with the consensus binding sequence for FTZ-F1, YCAAGGYCR. Among these, three fragments functioned as negative regulatory elements in response to ELP, when placed upstream to the promoter region of the Moloney leukemia virus. These results indicate that ELP may function as a negative transcription factor for a variety of cellular sequences, in addition to suppressing expression of Moloney leukemia virus in early embryonal cells. It was also shown that the procedure employed here works well for isolation of genomic targets of transcription factors.

nucleic acids research

Isolation of high affinity cellular targets of the embryonal LTR binding protein, an undifferentiated embryonal carcinoma cell-specific repressor of Moloney leukemia virus