A dimeric structure for archaeal box C/D small ribonucleoproteins.

A dimeric structure for archaeal box C/D small ribonucleoproteins.
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DOI:
10.1126/science.1176099
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发表时间:
2009-09-11
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Baserga SJ
Baserga SJ
中科院分区:
其他
文献类型:
--
作者:
Bleichert F;Gagnon KT;Brown BA 2nd;Maxwell ES;Leschziner AE;Unger VM;Baserga SJ

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核糖体RNA(rRNA)的甲基化是最佳蛋白质合成所必需的。多个2 '-O-核糖甲基化由小(核仁)盒C/D引导核糖核蛋白(s(no)RNP)进行,其在自然界中从古细菌到真核生物普遍存在。每个甲基化位点由s(no)RNP的特异性引导s(no)RNA组分与靶rRNA之间的碱基配对决定。在这里,我们提出了第一个结构的重组和催化活性盒C/D sRNP从古菌Methanocaldococcus jannaschii确定通过单粒子电子显微镜。我们的研究结果表明,古细菌盒C/D sRNP意外地形成了一个二聚体结构,其RNA和蛋白质组分的新组织,挑战了盒C/D s(无)RNP结构的传统观点。突变分析表明,双sRNP结构与古细菌盒C/D sRNP作为RNP酶的功能相关。
Methylation of ribosomal RNA (rRNA) is required for optimal protein synthesis. Multiple 2'-O-ribose methylations are carried out by small (nucleolar) box C/D guide ribonucleoproteins (s(no)RNPs), which are ubiquitous in nature from archaea to eukaryotes. Each site of methylation is dictated by base pairing between the specific guide s(no)RNA component of the s(no)RNP and the target rRNA. Here we present the first structure of a reconstituted and catalytically active box C/D sRNP from the archaeon Methanocaldococcus jannaschii determined by single-particle electron microscopy. Our results reveal that archaeal box C/D sRNPs unexpectedly form a dimeric structure with a novel organization of their RNA and protein components, challenging the conventional view of box C/D s(no)RNP architecture. Mutational analysis demonstrates that the di-sRNP structure is relevant for the function of archaeal box C/D sRNPs as RNP enzymes.
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