Trans-activation by the Drosophila myb gene product requires a Drosophila homologue of CBP

FEBS Lett. 1997 Aug 11;413(1):60-4. doi: 10.1016/s0014-5793(97)00879-x.


Attempts to demonstrate trans-activation activity by the Drosophila myb gene product (D-Myb) have been unsuccessful so far. We demonstrate that co-transfection of Schneider cells with a plasmid expressing the Drosophila homologue of transcriptional co-activator CBP (dCBP) results in transactivation by D-Myb. Using this assay system, the functional domains of D-Myb were analyzed. Two domains located in the N-proximal region, one of which is required for DNA binding and the other for dCBP binding, are both necessary and sufficient for trans-activation. In this respect, D-Myb is similar to c-Myb and A-Myb, but different from mammalian B-Myb. These results shed light on how the myb gene diverged during the course of evolution.

MeSH terms

  • Animals
  • CREB-Binding Protein
  • DNA-Binding Proteins / genetics
  • Drosophila / genetics*
  • Mutation
  • Nuclear Proteins / genetics*
  • Nuclear Proteins / metabolism
  • Proto-Oncogene Proteins / genetics*
  • Proto-Oncogene Proteins / metabolism
  • Proto-Oncogene Proteins c-myb
  • Species Specificity
  • Trans-Activators / genetics*
  • Trans-Activators / metabolism
  • Transcription Factors / genetics*
  • Transcription Factors / metabolism
  • Transcriptional Activation*
  • Transfection


  • DNA-Binding Proteins
  • Nuclear Proteins
  • Proto-Oncogene Proteins
  • Proto-Oncogene Proteins c-myb
  • Trans-Activators
  • Transcription Factors
  • CREB-Binding Protein