Functional redundancy of the nuclear factor kappa B inhibitors I kappa B alpha and I kappa B beta.

Functional redundancy of the nuclear factor kappa B inhibitors I kappa B alpha and I kappa B beta.
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DOI:
10.1084/jem.188.6.1055
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发表时间:
1998-09-21
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Bravo R
Bravo R
中科院分区:
其他
文献类型:
--
作者:
Cheng JD;Ryseck RP;Attar RM;Dambach D;Bravo R

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转录因子NF-κB被IκB家族的抑制蛋白隔离在细胞质中。IκB的每个成员都表现出结构和生化上的相似性以及差异。为了解决两种密切相关的IκB分子IκBα和IκBβ的功能冗余,我们通过用IκBβ基因替换I κBα基因来产生敲入小鼠。敲入小鼠不表达IκBα,但在ikba的启动子和调控序列下表达T7标记的IκBβ。与IκBα缺陷小鼠不同,IκBα缺陷小鼠表现出严重的出生后发育缺陷,并在出生后第8天死亡,纯合基因敲入小鼠存活至成年,具有生育能力,并且没有表现出明显的异常。此外,来自基因敲入动物的胸腺细胞和胚胎成纤维细胞表现出与野生型动物相似的诱导型NF-κB应答。这些结果表明,IκBα和IκBβ在生物化学活性上具有显著的相似性,它们在进化过程中通过不同的表达模式获得了不同的功能。
The transcription factor NF-κB is sequestered in the cytoplasm by the inhibitor proteins of the IκB family. Each member of the IκB exhibits structural and biochemical similarities as well as differences. In an effort to address the functional redundancy of two closely related IκB molecules, IκBα and IκBβ, we generated knock-in mice by replacing the IκBα gene with the IκBβ gene. The knock-in mice do not express IκBα, but express a T7-tagged IκBβ under the promoter and regulatory sequence of ikba. Unlike the IκBα-deficient mice, which display severe postnatal developmental defects and die by postnatal day 8, homozygous knock-in mice survive to adulthood, are fertile, and exhibit no apparent abnormalities. Furthermore, thymocytes and embryonic fibroblasts from the knock-in animals exhibit an inducible NF-κB response similar to that of wild-type animals. These results indicate that IκBα and IκBβ share significant similarities in their biochemical activity, and that they acquired their different functions from divergent expression patterns during evolution.
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