期刊
SCIENCE
卷 344, 期 6185, 页码 760-764出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1250020
关键词
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资金
- RIKEN RCAI project for Interdisciplinary Research
- Cell Innovation Program, Ministry of Education, Culture, Sports, Science and Technology, Japan
- Aihara Innovative Mathematical Modelling Project, FIRST program, Japan Society for the Promotion of Science
- Cancer Research Institute
- NIH [5R01CA141722]
- Grants-in-Aid for Scientific Research [26102547] Funding Source: KAKEN
A switchlike response in nuclear factor-kappa B (NF-kappa B) activity implies the existence of a threshold in the NF-kappa B signaling module. We show that the CARD-containing MAGUK protein 1 (CARMA1, also called CARD11)-TAK1 (MAP3K7)-inhibitor of NF-kappa B (I kappa B) kinase-beta (IKK beta) module is a switch mechanism for NF-kappa B activation in B cell receptor (BCR) signaling. Experimental and mathematical modeling analyses showed that IKK activity is regulated by positive feedback from IKK beta to TAK1, generating a steep dose response to BCR stimulation. Mutation of the scaffolding protein CARMA1 at serine-578, an IKK beta target, abrogated not only late TAK1 activity, but also the switchlike activation of NF-kappa B in single cells, suggesting that phosphorylation of this residue accounts for the feedback.
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