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Mol. Cell. Biol., 08 1995, 4518-4524, Vol 15, No. 8
CP Shen and T Kadesch
B cells express a unique E-box-binding activity that contains basic
helix-loop-helix (bHLH) proteins encoded by the E2A gene. E2A proteins play
a central role in immunoglobulin gene transcription and are also required
for the generation of the B-lymphocyte lineage. In muscle, E2A proteins
bind DNA as heterodimers with muscle-specific bHLH partners, such as MyoD
and myogenin, and these heterodimers are thought to be both necessary and
sufficient for muscle determination in cultured cells. Our results indicate
that in B cells, the bHLH partners for E2A proteins are not
B-cell-restricted proteins, but are the E2A proteins themselves. UV
cross-linking, gel purification, and the analysis of "forced heterodimers"
indicate that BCF1 is primarily a homodimer of the E2A protein E47. Since
E47 is widely expressed, our results argue for a difference in the inherent
DNA-binding properties of the E47 protein in B cells and may help explain
the restricted B-lineage defect observed in E2A-deficient mice.
Copyright © 1995, American Society for Microbiology
B-cell-specific DNA binding by an E47 homodimer
Howard Hughes Medical Institute, University of Pennsylvania School of Medicine, Philadelphia 19104, USA.
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