Formation of the Conserved Pseudouridine at Position 55 in Archaeal TRNA

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 2006 Aug 22

PMID 16920741

Citations 55

Authors

Martine Roovers

Caryn Hale

Catherine Tricot

Michael P Terns

Rebecca M Terns

Henri Grosjean

Louis Droogmans

Affiliations

Soon will be listed here.

Abstract

Pseudouridine (Psi) located at position 55 in tRNA is a nearly universally conserved RNA modification found in all three domains of life. This modification is catalyzed by TruB in bacteria and by Pus4 in eukaryotes, but so far the Psi55 synthase has not been identified in archaea. In this work, we report the ability of two distinct pseudouridine synthases from the hyperthermophilic archaeon Pyrococcus furiosus to specifically modify U55 in tRNA in vitro. These enzymes are (pfu)Cbf5, a protein known to play a role in RNA-guided modification of rRNA, and (pfu)PsuX, a previously uncharacterized enzyme that is not a member of the TruB/Pus4/Cbf5 family of pseudouridine synthases. (pfu)PsuX is hereafter renamed (pfu)Pus10. Both enzymes specifically modify tRNA U55 in vitro but exhibit differences in substrate recognition. In addition, we find that in a heterologous in vivo system, (pfu)Pus10 efficiently complements an Escherichia coli strain deficient in the bacterial Psi55 synthase TruB. These results indicate that it is probable that (pfu)Cbf5 or (pfu)Pus10 (or both) is responsible for the introduction of pseudouridine at U55 in tRNAs in archaea. While we cannot unequivocally assign the function from our results, both possibilities represent unexpected functions of these proteins as discussed herein.

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