Differential interactions of Id proteins with basic-helix-loop-helix transcription factors.

Dimerization of three Id proteins (Id1, Id2, and Id3) with the four class A E proteins (E12, E47, E2-2, and HEB) and two groups of class B proteins, the myogenic regulatory factors (MRFs: MyoD, myogenin, Myf-5 and MRF4/Myf-6), and the hematopoietic factors (Scl/Tal-1, Tal-2, and Lyl-1) were tested in a ...
quantitative yeast 2-hybrid assay. All three Ids bound with high affinity to E proteins, but a much broader range of interactions was observed between Ids and the class B factors. Id1 and Id2 interacted strongly with MyoD and Myf-5 and weakly with myogenin and MRF4/Myf-6, whereas Id3 interacted weakly with all four MRFs. Similar specificities were observed in co-immunoprecipitation and mammalian 2-hybrid analyses. No interactions were found between the Ids and any of the hematopoietic factors. Each Id was able to disrupt the ability of E protein-MyoD complexes to transactivate from a muscle creatine kinase reporter construct in vivo. Finally, mutagenesis experiments showed that the differences between Id1 and Id3 binding map to three amino acids in the first helix and to a small cluster of upstream residues. The Id proteins thus display a signature range of interactions with all of their potential dimerization partners and may play a role in myogenesis which is distinct from that in hematopoiesis.
Mesh Terms:
Animals, Basic Helix-Loop-Helix Transcription Factors, Binding Sites, DNA-Binding Proteins, Dimerization, Helix-Loop-Helix Motifs, Inhibitor of Differentiation Protein 1, Mice, Muscle Proteins, Mutagenesis, Site-Directed, MyoD Protein, Myogenic Regulatory Factor 5, Myogenic Regulatory Factors, Myogenin, Nerve Tissue Proteins, Protein Binding, Repressor Proteins, Saccharomyces cerevisiae, TCF Transcription Factors, Trans-Activators, Transcription Factors
J. Biol. Chem.
Date: Aug. 08, 1997
Download Curated Data For This Publication
Switch View:
  • Interactions 27