A Second Base Pair Interaction Between U3 Small Nucleolar RNA and the 5'-ETS Region is Required for Early Cleavage of the Yeast Pre-ribosomal RNA

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 2011 Sep 6

PMID 21890904

Citations 42

Authors

Nathalie Marmier-Gourrier

Antoine Clery

Florence Schlotter

Veronique Senty-Segault

Christiane Branlant

Affiliations

Soon will be listed here.

Abstract

In eukaryotes, U3 snoRNA is essential for pre-rRNA maturation. Its 5'-domain was found to form base pair interactions with the 18S and 5'-ETS parts of the pre-rRNA. In Xenopus laevis, two segments of U3 snoRNA form base-pair interactions with the 5'-ETS region and only one of them is essential to the maturation process. In Saccharomyces cerevisiae, two similar U3 snoRNA-5' ETS interactions are possible; but, the functional importance of only one of them had been tested. Surprisingly, this interaction, which corresponds to the non-essential one in X. laevis, is essential for cell growth and pre-rRNA maturation in yeast. In parallel with [Dutca et al. (2011) The initial U3 snoRNA:pre-rRNA base pairing interaction required for pre-18S rRNA folding revealed by in vivo chemical probing. Nucleic Acids Research, 39, 5164-5180], here we show, that the second possible 11-bp long interaction between the 5' domain of S. cerevisiae U3 snoRNA and the pre-rRNA 5'-ETS region (helix VI) is also essential for pre-rRNA processing and cell growth. Compensatory mutations in one-half of helix VI fully restored cell growth. Only a partial restoration of growth was obtained upon extension of compensatory mutations to the entire helix VI, suggesting sequence requirement for binding of specific proteins. Accordingly, we got strong evidences for a role of segment VI in the association of proteins Mpp10, Imp4 and Imp3.

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