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Nucleic Acids Research, 1983, Vol. 11, No. 20 7141-7144
© 1983

MOLECULAR BIOLOGY

The nucleotide sequences of 5S rRNAs from two ribbon worms: Emplectonema gracile contains two 5S rRNA species differing considerably in their sequences

Tsutomu Kumazaki1, Hiroshi Hori and Syozo Osawa

Laboratory of Molecular Genetics, Department of Biology, Faculty of Science, Nagoya University, Chikusa Nagoya 464, Japan

Received August 19, 1983. Accepted September 30, 1983.

The nucleotide sequences of 5S rRNAs from two nelnerteans (ribbon worms), Lineua genicutatua and Emplectonera gracile have been determined. Emplectonema has two 5S rRNA species that are composed of 119 and 120 nucleotides, respectively. The sequences of these two 5S rRNAs differ at 22 positions. On the other hand, only a single 5S rRNA species was found in Lineus. The sequence similarity percents are 88% (Lineus/Emplectonema longer 5S rRNA), 82% (Emplectonema longer/Emplectonema shorter) and 80% (Lineus/Emplectonema shorter). The comparisons of these sequences with those of other organisms suggest that the phylum Nemertinea is most related to the Mollusca (91%) and the Rotifera (89%), but not to fresh-water planarias (72%).

1Present address: Department of Biochemistry and Biophysics, Research Inatitute for Nuclear Medicine and Biology, Hiroshima University, Hiroshima 734, Japan


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