Enzymatic processing of platinated RNAs.

Enzymatic processing of platinated RNAs.
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DOI:
10.1021/ja908419j
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发表时间:
2010-02-17
影响因子:
15
通讯作者:
DeRose, Victoria J.
DeRose, Victoria J.
中科院分区:
化学1区
文献类型:
--
作者:
Chapman, Erich G.;DeRose, Victoria J.

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广泛使用的抗肿瘤药物顺铂与DNA配位,改变细胞蛋白质的活性,这些蛋白质的功能依赖于感知DNA结构。顺铂也已知与RNA配位,但RNA-Pt加合物对处理转录组的大量蛋白质的影响目前尚不清楚。为了解决RNA的铂化如何改变RNA加工酶的功能,我们已经确定了[Pt(NH3)2]2+-RNA加合物对3' → 5'和5 '→ 3'磷酸二酯酶、嘌呤特异性核糖核酸内切酶和逆转录酶活性的影响。发现在RNA寡核苷酸上的单一Pt(II)加合物形式(5 '-U6-XY-U 5 - 3':XY=GG、GA、AG、GU)阻断核酸外切酶消化。观察到类似的核酸内切裂解破坏,除了铂化XY= GA RNA,其中RNA酶U2独特地耐受铂修饰。与更复杂的RNA形成的铂加合物可以阻止逆转录,这提供了铂化能够干扰RNA在传递序列信息中的作用的证据。观察到的酶活性中断表明细胞RNA加工可能受到类似影响的可能性,这可能有助于铂类抗肿瘤药物的细胞范围效应。此外,我们表明硫脲逆转顺铂-RNA加合物,提供了一个化学工具,用于未来的研究顺铂靶向细胞RNA。
The broadly prescribed anti-tumor drug cisplatin coordinates to DNA, altering the activity of cellular proteins whose functions rely upon sensing DNA structure. Cisplatin is also known to coordinate to RNA, but the effects of RNA-Pt adducts on the large number of proteins that process the transcriptome are currently unknown. In an effort to address how platination of an RNA alters the function of RNA processing enzymes, we have determined the influence of [Pt(NH3)2]2+-RNA adducts on the activities of 3’ → 5’ and 5’→3’ phosphodiesterases, a purine-specific endoribonuclease, and a reverse transcriptase. Single Pt(II) adducts on RNA oligonucleotides of form (5’-U6-XY-U5-3’: XY=GG, GA, AG, GU) are found to block exonucleolytic digestion. Similar disruption of endonucleolytic cleavage is observed, except for the platinated XY= GA RNA where RNase U2 uniquely tolerates platinum modification. Platinum adducts formed with a more complex RNA prevent reverse transcription, providing evidence that platination is capable of interfering with RNA’s role in relaying sequence information. The observed disruptions in enzymatic activity point to the possibility that cellular RNA processing may be similarly affected, which could contribute to the cell-wide effects of platinum anti-tumor drugs. Additionally, we show that thiourea reverses cisplatin-RNA adducts, providing a chemical tool for use in future studies regarding cisplatin targeting of cellular RNAs.
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