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Multiprotein complexes present at the MIF motifs flanking the promoter of the human c‐myc gene
Author(s) -
Itkes Alexander,
Allegra Carmen J,
Zajac-Kaye Maria
Publication year - 2000
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(00)01562-3
Subject(s) - intron , gene , promoter , microbiology and biotechnology , biology , somatic cell , genetics , regulatory sequence , 5' flanking region , transcription factor , gene expression
The activated c‐myc allele in Burkitt's lymphoma is associated with a clustering of somatic mutations within a discrete domain of intron I that define protein recognition sequences, designated as myc intron factors (MIF‐1, MIF‐2 and MIF‐3). We have previously shown that MIF‐1 binding activity consists of two polypeptides, myc intron binding polypeptide (MIBP1) and RFX1. In the present study we identified two polypeptides, p105 and p115, and showed that these proteins give rise to a DNA–protein complex at the MIF‐2 as well as the adjacent MIF‐1 site. In addition, we demonstrated that all four proteins interact with a novel MIF‐1 like motif upstream from the c‐myc promoter region, designated 5′MIF. These data suggest a model, where the interactions of MIBP1/RFX1 and p105/p115 with the MIF‐like sites may play a role in the promoter topology of the c‐myc gene.