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  • Title: Functional domains of c-Myc involved in the commitment and differentiation of murine erythroleukemia cells.
    Author: Ohmori Y, Tanabe J, Takada S, Lee WM, Obinata M.
    Journal: Oncogene; 1993 Feb; 8(2):379-86. PubMed ID: 8426744.
    Abstract:
    In the early event of the induction of mouse erythroleukemia (MEL) cell differentiation, c-myc mRNA levels show a drastic change. The elevated expression of a transfected c-myc gene inhibits the commitment and differentiation of MEL cell transformants. In the present work, we have introduced human c-myc mutants into MEL cells under the inducible promoter to define the functional domains of c-Myc involved in erythroid differentiation. The c-Myc domains necessary for commitment and differentiation are not co-localized; almost entire regions are required for inhibition of commitment, whereas domains II and IV that are essential for co-transforming activity with ras are required for inhibition of differentiation. Interestingly, mutants that delete domains for c-Myc dimerization motifs enhanced differentiation. These results suggest that c-Myc may regulate commitment and differentiation by interacting with proteins through different domains.
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