Journal of Molecular Biology
Volume 266, Issue 2, 21 February 1997, Pages 246-268
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Regular article
Mapping to nucleotide resolution of pseudouridine residues in large subunit ribosomal RNAs from representative eukaryotes, prokaryotes, archaebacteria, mitochondria and chloroplasts1

https://doi.org/10.1006/jmbi.1996.0737Get rights and content
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Abstract

The pseudouridine (Ψ) residues present in the high molecular mass RNA from the large ribosomal subunit (LSU) have been sequenced from representative species of the eukaryotes, prokaryotes and archaebacteria, and from mitochondrial and chloroplast organelles. Ribosomes from Bacillus subtilis, Halobacter halobium, Drosphilia melanogaster, Mus musculus, Homo sapiens, mitochondria of M. musculus, H. sapiens andTrypanosoma brucei, and Zea mays chloroplasts were examined, resulting in the exact localization of 190 Ψ residues. The number of Ψ residues per RNA varied from one in the mitochondrial RNAs to 57 in the cytoplasmic LSU RNA ofD. melanogaster and M. musculus. Despite this, all of the Ψ residues were found in three domains, II, IV and V. All three are at or have been linked to the peptidyl transferase center according to the literature. Comparison of the sites for Ψ among the species examined revealed four conserved or semi-conserved segments. One is the region 1911 to 1917, which contains three Ψ or modified Ψ in almost all species examined. This site is also juxtaposed to the decoding site of the 30 S subunit in the 70 S ribosome and has been implicated in the fidelity of codon recognition. Three additional sites were at the peptidyl transferase center itself. The juxtaposition of the conserved sites for Ψ with the two important functions of the ribosome, codon recognition and peptide bond formation, implies an important role for Ψ in ribosome function.

We report some new putative modified nucleosides in LSU RNAs as detected by reverse transcription, correct a segment of the sequence ofZ. mays chloroplasts and D. melanogaster LSU RNA, correlate the secondary structural context for all known Ψ residues in ribosomal RNA, and compare the sites for Ψ with those known for methylated nucleosides in H. sapiens.

Keywords

modified nucleosides
rRNA
sequencing
secondary structure
ribosome

Abbreviations

LSU
large subunit
PTC
peptidyl transferase center
CMC
1-cyclohexyl-3-(2-morpholinoethyl)carbodiimide metho-p-toluenesulfonate

Cited by (0)

1

Edited by D. E. Draper

2

Present address: A. Bakin, Department of Developmental Neurobiology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA.