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Mol Cell Biol. 2011 Jan;31(2):365-74. doi: 10.1128/MCB.00918-10. Epub 2010 Nov 1.

The spatial-functional coupling of box C/D and C'/D' RNPs is an evolutionarily conserved feature of the eukaryotic box C/D snoRNP nucleotide modification complex.

Author information

1
Department of Molecular and Structural Biochemistry, North Carolina State University, Raleigh, NC 27695-7622, USA. stu_maxwell@ncsu.edu

Abstract

Box C/D ribonucleoprotein particles guide the 2'-O-ribose methylation of target nucleotides in both archaeal and eukaryotic RNAs. These complexes contain two functional centers, assembled around the C/D and C'/D' motifs in the box C/D RNA. The C/D and C'/D' RNPs of the archaeal snoRNA-like RNP (sRNP) are spatially and functionally coupled. Here, we show that similar coupling also occurs in eukaryotic box C/D snoRNPs. The C/D RNP guided 2'-O-methylation when the C'/D' motif was either mutated or ablated. In contrast, the C'/D' RNP was inactive as an independent complex. Additional experiments demonstrated that the internal C'/D' RNP is spatially coupled to the terminal box C/D complex. Pulldown experiments also indicated that all four core proteins are independently recruited to the box C/D and C'/D' motifs. Therefore, the spatial-functional coupling of box C/D and C'/D' RNPs is an evolutionarily conserved feature of both archaeal and eukaryotic box C/D RNP complexes.

PMID:
21041475
PMCID:
PMC3019978
DOI:
10.1128/MCB.00918-10
[Indexed for MEDLINE]
Free PMC Article
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