Co-translational Polyamine Sensing by Nascent ODC Antizyme

Co-translational Polyamine Sensing by Nascent ODC Antizyme
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新生 ODC 抗酶的共翻译多胺传感

DOI:
10.1007/978-4-431-55052-5_12
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
Dohmen
Dohmen
中科院分区:
--
文献类型:
--
作者:
Palanimurugan;Kurian;Dohmen

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多胺 是必需的生物源聚阳离子,在许多细胞过程中发挥重要作用,包括翻译和DNA复制。高水平的多胺与癌症有关。然而,多胺水平的增加也被证明可以促进长寿。多胺的细胞调节涉及多种复杂的机制,这些机制调节多胺的摄取和排泄以及多胺的合成和催化。多胺生物合成中的一个关键酶是鸟氨酸脱羧酶 (ODC)。这种同源二聚体蛋白的活性和稳定性由ODC抗酶控制 (OAZ). OAZ结合ODC单体,从而靶向它们进行不依赖于泛素的降解 蛋白酶体的作用。OAZ由中断的开放阅读帧编码。因此,功能性蛋白质的合成减慢,并且仅在核糖体移码(RFS)事件发生时发生。高浓度的多胺导致OAZmRNA翻译效率的增加。我们的研究表明,当多胺浓度较低时,新生OAZ多肽引起核糖体的翻译停滞。在较高浓度下,多胺与新生OAZ的结合可防止核糖体在OAZmRNA上停滞,从而促进全长ODC抗酶的合成。因此,多胺的共翻译传感有助于多胺生物合成的稳态调节。
Polyamines are essential biogenic poly-cations with important roles in many cellular processes, including translation and DNA replication. High levels of polyamines have been linked to cancer. Increased levels of polyamines, however, have also been shown to promote longevity. Cellular regulation of polyamines involves a variety of complex mechanisms that regulate uptake and excretion as well as synthesis and catabolism of polyamines. A key enzyme in the biosynthesis of polyamines is ornithine decarboxylase (ODC). The activity and stability of this homodimeric protein is controlled by ODC antizyme (OAZ). OAZ binds ODC monomers and thereby targets them for ubiquitin-independent degradation by the proteasome. OAZ is encoded by an interrupted open reading frame. As a consequence, synthesis of the functional protein is slowed and only occurs when a ribosomal frameshift (RFS) event takes place. High polyamine concentrations lead to an increased efficiency of translation ofOAZmRNA. Our studies have revealed that nascent OAZ polypeptide causes a translational arrest of ribosomes when polyamine concentration is low. At higher concentrations, binding of polyamines to nascent OAZ prevents stalling of the ribosomes onOAZmRNA and thereby promotes synthesis of full-length ODC antizyme. Co-translational sensing of polyamines thereby contributes to a homeostatic regulation of polyamine biosynthesis.
含有 (dA-dC)n.(dG-dT)n 插入片段的质粒中多胺诱导 Z-DNA 构象,并增加狼疮自身抗体与质粒 Z-DNA 形式的结合。
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发表时间: 1994
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