Efficient RNA 2'-O-methylation Requires Juxtaposed and Symmetrically Assembled Archaeal Box C/D and C'/D' RNPs

Overview

Journal EMBO J

Specialties Biotechnology
Molecular Biology

Date 2003 Jul 26

PMID 12881427

Citations 64

Authors

Elizabeth J Tran

Xinxin Zhang

E Stuart Maxwell

Affiliations

Soon will be listed here.

Abstract

Box C/D ribonucleoprotein (RNP) complexes direct the nucleotide-specific 2'-O-methylation of ribonucleotide sugars in target RNAs. In vitro assembly of an archaeal box C/D sRNP using recombinant core proteins L7, Nop56/58 and fibrillarin has yielded an RNA:protein enzyme that guides methylation from both the terminal box C/D core and internal C'/D' RNP complexes. Reconstitution of sRNP complexes containing only box C/D or C'/D' motifs has demonstrated that the terminal box C/D RNP is the minimal methylation-competent particle. However, efficient ribonucleotide 2'-O-methylation requires that both the box C/D and C'/D' RNPs function within the full-length sRNA molecule. In contrast to the eukaryotic snoRNP complex, where the core proteins are distributed asymmetrically on the box C/D and C'/D' motifs, all three archaeal core proteins bind both motifs symmetrically. This difference in core protein distribution is a result of altered RNA-binding capabilities of the archaeal and eukaryotic core protein homologs. Thus, evolution of the box C/D nucleotide modification complex has resulted in structurally distinct archaeal and eukaryotic RNP particles.

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