Evolutionary conservation supports ancient origin for Nudt16, a nuclear-localized, RNA-binding, RNA-decapping enzyme.

Evolutionary conservation supports ancient origin for Nudt16, a nuclear-localized, RNA-binding, RNA-decapping enzyme.
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进化保护支持NUDT16的古代来源,NUDT16是一种核局部,RNA结合,消除RNA的酶。

DOI:
10.1093/nar/gkn605
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发表时间:
2008-10
影响因子:
14.9
通讯作者:
Peculis, Brenda A.
Peculis, Brenda A.
中科院分区:
生物学2区
文献类型:
--
作者:
Taylor, Melissa J.;Peculis, Brenda A.

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Nudt 16 p是一种核RNA脱帽蛋白,最初在非洲爪蟾(X29)中发现,并已知存在于哺乳动物中。在这里,我们确定了从人类到刺胞动物(海葵/珊瑚)的57种不同生物的推定直系同源物。体外分析表明,昆虫直系同源物可以结合RNA并水解RNA 5′端的m7 G帽,表明Nudt 16基因产物在后生动物中功能保守。这项研究还确定了一种密切相关的旁系同源蛋白,称为Syndesmos,它是由四足动物谱系中靠近马耳分叉的基因重复引起的。虽然脊椎动物Nudt 16 p是核RNA脱帽蛋白,但Syndesmos与四足动物的细胞质膜相关。Syndesmos对RNA去帽无活性,但保留RNA结合活性。这种结构/功能分析表明,进化保守的古老的Nudt 16蛋白,这表明在后生动物的核RNA降解途径的存在和维护。
Nudt16p is a nuclear RNA decapping protein initially identified in Xenopus (X29) and known to exist in mammals. Here, we identified putative orthologs in 57 different organisms ranging from humans to Cnidaria (anemone/coral). In vitro analysis demonstrated the insect ortholog can bind RNA and hydrolyze the m7G cap from the 5′-end of RNAs indicating the Nudt16 gene product is functionally conserved across metazoans. This study also identified a closely related paralogous protein, known as Syndesmos, which resulted from a gene duplication that occurred in the tetrapod lineage near the amniote divergence. While vertebrate Nudt16p is a nuclear RNA decapping protein, Syndesmos is associated with the cytoplasmic membrane in tetrapods. Syndesmos is inactive for RNA decapping but retains RNA-binding activity. This structure/function analysis demonstrates evolutionary conservation of the ancient Nudt16 protein suggesting the existence and maintenance of a nuclear RNA degradation pathway in metazoans.
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