Notch inhibition of E47 supports the existence of a novel signaling pathway

被引:228
作者
Ordentlich, P
Lin, A
Shen, CP
Blaumueller, C
Matsuno, K
Artavanis-Tsakonas, S
Kadesch, T
机构
[1] Univ Penn, Sch Med, Howard Hughes Med Inst, Philadelphia, PA 19104 USA
[2] Univ Penn, Sch Med, Dept Genet, Philadelphia, PA 19104 USA
[3] Yale Univ, Sch Med, Howard Hughes Med Inst, New Haven, CT 06536 USA
[4] Yale Univ, Sch Med, Dept Cell Biol, Boyer Ctr Mol Med, New Haven, CT 06536 USA
[5] Yale Univ, Sch Med, Dept Biol, Boyer Ctr Mol Med, New Haven, CT 06536 USA
关键词
D O I
10.1128/MCB.18.4.2230
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
E47 is a widely expressed transcription factor that activates B-cell-specific immunoglobulin gene transcription and is required for early B-cell development. In an effort to identify processes that regulate E47, and potentially B-cell development, we found that activated Notch1 and Notch2 effectively inhibit E47 activity. Only the intact E47 protein was inhibited by Notch-fusion proteins containing isolated DNA binding and activation domains were unaffected-suggesting that Notch targets an atypical E47 cofactor, although overexpression of the coactivator p300 partially reversed E47 inhibition, results of several assays indicated that p300/CBP is not a general target of Notch, Notch inhibition of E47 did not correlate with its ability to activate CBF1/RBP-J kappa, the mammalian homolog of Suppressor of Hairless, a protein that associates physically with Notch and defines the only known Notch signaling pathway in drosophila. Importantly, E47 was inhibited independently of CBF1/RPB-J kappa by Deltex, a second Notch-interacting protein. We provide evidence that Notch and Deltex may act on E47 by inhibiting signaling through Ras because (i) full E47 activity was found to be dependent on Ras and (ii) both Notch and Deltex inhibited GAL4-Jun, a hybrid transcription factor whose activity is dependent on signaling from Ras to SAPK/JNK.
引用
收藏
页码:2230 / 2239
页数:10
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