Abstract
ABSTRACT Notch is involved in the cell fate determination of many cell lineages. The intracellular region (RAMIC) of Notch1 trans-activates genes by interaction with a DNA binding protein RBP-J. We have compared the activities of mouse RAMIC and its derivatives in transactivation and differentiation sup-pression of myogenic precursor cells. RAMIC comprises two separate domains, IC for transactivation and RAM for RBP-J binding. Although the physical interaction of IC with RBP-J was much weaker than with RAM, transactivation activity of IC was shown to involve RBP-J by using an RBP-J null mutant cell line. IC showed differentiation suppression activity that was generally comparable to its transactivation activity. The RBP-J-VP16 fusion protein, which has strong transactivation activity, also suppressed myogenesis of C2C12. The RAM domain, which has no other activities than binding to RBP-J, synergistically stimulated transactivation activity of IC to the level of RAMIC. The RAM domain was proposed to compete with a putative co-repressor for binding to RBP-J because the RAM domain can also stimulate the activity of RBP-J-VP16. These results taken together, indicate that differentiation suppression of myogenic precursor cells by Notch signalling is due to transactivation of genes carrying RBP-J binding motifs.
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Dates
Type | When |
---|---|
Created | 4 years, 3 months ago (April 25, 2021, 11:01 p.m.) |
Deposited | 6 months, 1 week ago (Feb. 14, 2025, 12:10 a.m.) |
Indexed | 3 weeks, 6 days ago (July 28, 2025, 5:13 p.m.) |
Issued | 27 years, 10 months ago (Oct. 15, 1997) |
Published | 27 years, 10 months ago (Oct. 15, 1997) |
Published Online | 27 years, 10 months ago (Oct. 15, 1997) |
Published Print | 27 years, 10 months ago (Oct. 15, 1997) |
@article{Kato_1997, title={Involvement of RBP-J in biological functions of mouse Notch1 and its derivatives}, volume={124}, ISSN={1477-9129}, url={http://dx.doi.org/10.1242/dev.124.20.4133}, DOI={10.1242/dev.124.20.4133}, number={20}, journal={Development}, publisher={The Company of Biologists}, author={Kato, Hisamune and Taniguchi, Yoshihito and Kurooka, Hisanori and Minoguchi, Shigeru and Sakai, Takashi and Nomura-Okazaki, Saeko and Tamura, Kumiko and Honjo, Tasuku}, year={1997}, month=oct, pages={4133–4141} }