Overexpression of an enzymically inactive interleukin-1-receptor-associated kinase activates nuclear factor-κB

Overexpression of an enzymically inactive interleukin-1-receptor-associated kinase activates nuclear factor-κB
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DOI:
10.1042/0264-6021:3390227
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发表时间:
1999-04-15
影响因子:
4.1
通讯作者:
Volpe, F
Volpe, F
中科院分区:
生物学3区
文献类型:
--
作者:
Maschera, B;Ray, K;Volpe, F

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在白细胞介素 1 (IL-1) 刺激下,IL-1 受体 (IL-IR) 相关激酶 (IRAK) 迅速募集至 IL-IR 复合物并发生磷酸化。在这里,我们证明重组野生型 IRAK (IRAK-WT),而不是 Asp(340) 被天冬酰胺残基取代的激酶缺陷突变体 (IRAK-Asp(390)Asn),是高度磷酸化的,并且能够在体外自动磷酸化。 IRAK-WT 和 IRAK-sp(340)Asn 的过表达引起核因子 kappa B 的激活,表明 IL-IR 复合物之外不需要 IRAK 的激酶活性。
Upon interleukin 1 (IL-1) stimulation, the IL-1-receptor (IL-IR)associated kinase (IRAK) is rapidly recruited to the IL-IR complex and undergoes phosphorylation. Here we demonstrate that recombinant wild-type IRAK (IRAK-WT), but not a kinase-defective mutant with Asp(340) replaced by an asparagine residue (IRAK-Asp(390)Asn), is highly phosphorylated and is capable of auto-phosphorylation in vitro. Overexpression of both IRAK-WT and IRAK-sp(340)Asn caused activation of nuclear factor kappa B, suggesting that the kinase activity of IRAK is not required outside of the IL-IR complex.