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Nucleic Acids Research, 1981, Vol. 9, No. 23 6429-6437
© 1981

MOLECULAR BIOLOGY

Nucleotide sequences of the 5S ribosomal RNA genes and their adjacent regions in Schizosaccharomyces pombe

Satoshi Tabata

Institute for Chemical Research, Kyoto University Uji, Kyoto-fu 611, Japan

Received September 15, 1981. The organization of 5S ribosomal RNA (rRNA) genes in the genome of Schizosaccharomyces pombe has been investigated by restriction and hybridization analyses. The 5S rRNA genes were not linked to the other three species of rRNA genes which formed a repeating unit of 6.9 megadaltons, but located in other regions surrounded by heterogeneous sequences. The 5S rRNA gene organization in S. pombe is therefore different from those in other yeasts; Saccharomyces cerevisiae and Torulopsis utilis.

Four restriction segments of different sizes each containing a single 5S rRNA gene were cloned on a bacterial plasmid, and the sequences in and around the RNA coding regions were determined. In the RNA coding regions, the sequences in four clones were identical with an exception that one residue has been substituted in one clone. In the flanking regions, the sequences were extremely rich in the AT-content and highly heterogeneous. The sequences were also markedly different from those in the corresponding regions of the other two yeasts. The presence of T-clusters in the regions immediately after the RNA coding sequences was only notable homology among the four clones and the other two yeasts.


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