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:
影响因子:
--
通讯作者:
Baserga SJ
中科院分区:
文献类型:
--
作者:
Bleichert F;Gagnon KT;Brown BA 2nd;Maxwell ES;Leschziner AE;Unger VM;Baserga SJ
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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作者:
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通讯作者:
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影响因子:
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作者:
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作者:
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作者:
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DOI:
10.1038/nsb905
发表时间:
2003-04-01
期刊:
NATURE STRUCTURAL BIOLOGY
影响因子:
--
作者:
Aittaleb, M;Rashid, R;Li, H
通讯作者:
Li, H