"Spb1p-directed formation of Gm2922 in the ribosome catalytic center occurs at a late processing stage."

Lapeyre B, Purushothaman SK



Published 2004-11-19 in Mol Cell volume 16 .

Pubmed ID: 15546625
DOI identifier: -

Abstract:
rRNA molecules undergo extensive posttranscriptional modification, predominantly 2'-O-ribose methylation and pseudouridine formation, both of which are guided by the numerous small nucleolar RNAs in eukaryotes. Here, we describe an exception to this rule. The essential yeast nucleolar protein Spb1p is a site-specific rRNA methyltransferase modifying the universally conserved G2922 that is located within the A loop of the catalytic center of the ribosome. The equivalent position in bacteria is the docking site for aminoacyl-tRNA, and it is critical for translation. In sharp contrast to other 2'-O-methylriboses that are formed on the primary transcript, Gm2922 appears at a late processing stage, during the maturation of the 27S pre-rRNA. Thus, eukaryotes have maintained a site-specific enzyme to catalyze the methylation of a nucleotide that plays a crucial role in ribosome biogenesis and translation.


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Last modification of this entry: Sept. 6, 2012