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. 1995 Aug 25;23(16):3290–3294. doi: 10.1093/nar/23.16.3290

Mapping of the 13 pseudouridine residues in Saccharomyces cerevisiae small subunit ribosomal RNA to nucleotide resolution.

A Bakin 1, J Ofengand 1
PMCID: PMC307190  PMID: 7545286

Abstract

The number and location of all of the pseudouridine (phi) residues in Saccharomyces cerevisiae small subunit (SSU) ribosomal RNA have been determined by a reverse transcriptase sequencing method [Bakin, A. and Ofengand, J., 1993, Biochemistry, 32, 9754-9762]. Thirteen residues were found in addition to the previously described m1acp3 phi 1189. The residues were scattered throughout the molecule with three being in expansion segments. No phi was found in the three highly conserved single-stranded sequence elements common to all SSU RNAs. Specifically, phi 563, the analog of phi 516 (Escherichia coli) and phi 517 (Bacillus subtilis) were not found. Eight of the phi were located identically to those in mammalian SSU RNA and three were near to mammalian phi residues in the secondary structure. There was no discernible correlation between the sites for phi and the known locations of the methylated nucleosides as exists in large subunit (LSU) RNAs. Comparison of the structural context in which phi was found in SSU RNA with that in LSU RNA showed a differential bias suggestive of possible different roles for phi in the two rRNAs. This work also identified the locations of three putative new modified bases in SSU rRNA, and revealed 15 sequence differences between the yeast strain used here and the reported sequence.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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