Pseudouridine Mapping in the Saccharomyces cerevisiae Spliceosomal U Small Nuclear RNAs (snRNAs) Reveals that Pseudouridine Synthase Pus1p Exhibits a Dual Substrate Specificity for U2 snRNA and tRNA

Author:

Massenet Séverine1,Motorin Yuri2,Lafontaine Denis L. J.3,Hurt Eduard C.4,Grosjean Henri2,Branlant Christiane1

Affiliation:

1. Laboratoire de Maturation des ARN et Enzymologie Moléculaire, UMR7567 CNRS-UHP, Faculté des Sciences, 54506 Vandoeuvre-les-Nancy Cédex, 1 and

2. Laboratoire d’Enzymologie et Biochimie Structurales, UPR CNRS, 91198 Gif-sur-Yvette, 2 France;

3. Institute of Cell and Molecular Biology, University of Edinburgh, Edinburgh EH9 3JR, United Kingdom 3 ; and

4. University of Heidelberg, 69120 Heidelberg, Germany4

Abstract

ABSTRACT Pseudouridine (Ψ) residues were localized in the Saccharomyces cerevisiae spliceosomal U small nuclear RNAs (UsnRNAs) by using the chemical mapping method. In contrast to vertebrate UsnRNAs, S. cerevisiae UsnRNAs contain only a few Ψ residues, which are located in segments involved in intermolecular RNA-RNA or RNA-protein interactions. At these positions, UsnRNAs are universally modified. When yeast mutants disrupted for one of the several pseudouridine synthase genes ( PUS1 , PUS2 , PUS3 , and PUS4 ) or depleted in rRNA-pseudouridine synthase Cbf5p were tested for UsnRNA Ψ content, only the loss of the Pus1p activity was found to affect Ψ formation in spliceosomal UsnRNAs. Indeed, Ψ 44 formation in U2 snRNA was abolished. By using purified Pus1p enzyme and in vitro-produced U2 snRNA, Pus1p is shown here to catalyze Ψ 44 formation in the S. cerevisiae U2 snRNA. Thus, Pus1p is the first UsnRNA pseudouridine synthase characterized so far which exhibits a dual substrate specificity, acting on both tRNAs and U2 snRNA. As depletion of rRNA-pseudouridine synthase Cbf5p had no effect on UsnRNA Ψ content, formation of Ψ residues in S. cerevisiae UsnRNAs is not dependent on the Cbf5p-snoRNA guided mechanism.

Publisher

American Society for Microbiology

Subject

Cell Biology,Molecular Biology

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