Nucleolar protein NPM interacts with HDM2 and protects tumor suppressor protein p53 from HDM2-mediated degradation

Nucleolar protein NPM interacts with HDM2 and protects tumor suppressor protein p53 from HDM2-mediated degradation
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DOI:
10.1016/s1535-6108(04)00110-2
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发表时间:
2004-05-01
期刊:
影响因子:
50.3
通讯作者:
Laiho, M
Laiho, M
中科院分区:
医学1区
文献类型:
--
作者:
Kurki, S;Peltonen, K;Laiho, M

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核磷蛋白 (NPM, B23) 是一种丰富的核仁磷蛋白,参与核糖体生物发生,并与肿瘤抑制蛋白 p53 和 Rb 相互作用。在这里,我们证明 NPM 是一种紫外线损伤反应蛋白,它经历核质重新分配并调节 p53 和 HDM2 水平及其相互作用。通过利用 RNAi 方法和对内源性和异位表达蛋白的分析,我们证明 NPM 结合 HDM2 并充当 p53-HDM2 相互作用的负调节因子。卡波西肉瘤病毒 K 细胞周期蛋白的表达强制执行病毒应激,导致 NPM 重新分布、K 细胞周期蛋白-NPM 关联,​​以及通过 HDM2-p53 复合物解离使 p53 稳定。结果证明了 HDM2 和 K 细胞周期蛋白与 NPM 的新关联,并表明 NPM 通过抑制 HDM2 作为 p53 的关键控制器。
Nucleophosmin (NPM, B23) is an abundant nucleolar phosphoprotein involved in ribosome biogenesis, and interacts with tumor suppressor proteins p53 and Rb. Here we show that NPM is a UV damage response protein that undergoes nucleoplasmic redistribution and regulates p53 and HDM2 levels and their interaction. By utilizing RNAi approaches and analyses of endogenous and ectopically expressed proteins, we demonstrate that NPM binds HDM2 and acts as a negative regulator of p53-HDM2 interaction. Viral stress, enforced by expression of Kaposi's sarcoma virus K cyclin, causes NPM redistribution, K cyclin-NPM association, and p53 stabilization by dissociation of HDM2-p53 complexes. The results demonstrate novel associations of HDM2 and K cyclin with NPM and implicate NPM as a crucial controller of p53 through inhibition of HDM2.