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Organization and nucleotide sequence of ribosomal RNA genes on a circular 73 kbp DNA from the colourless flagellate Astasia longa

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Summary

Three tandemly arranged repeats (A, B, C) of 16S and 23S rDNA, and one supplementary (S) 16S rDNA adjacent to the 16S rDNA of repeat A, are present within an 18 kbp segment of a circular 73 kbp DNA from the colourless flagellate Astasia longa. The repeat units are separated by a short region containing a 5S rRNA gene and a gene for tRNA-Val (UAC). Sequence comparisons reveal 78%, 81%, and 67% identical nucleotides of the 23S rDNA (A), the 16S rDNA (B), and the 5S rDNA (A), respectively, with the corresponding genes of the Euglena gracilis chloroplast genome. As in Euglena chloroplasts, the 3′-terminal protion of the 23S rDNA is homologous to the 4.5S rRNA gene of higher plant chloroplast genomes. These results are supportive of a common evolutionary origin for the Astasia 73 kbp DNA and the Euglena 145 kbp chloroplast DNA.

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  1. G. Siemeister

    Present address: Medizinische Fakultät, Institut für Biochemie, D-5000, Köln 41, FRG

Authors and Affiliations

  1. Botanisches Institut der Universität Bonn, Kirschallee 1, D-5300, Bonn, Federal Republic of Germany

    G. Siemeister & W. Hachtel

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  1. G. Siemeister
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  2. W. Hachtel
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Siemeister, G., Hachtel, W. Organization and nucleotide sequence of ribosomal RNA genes on a circular 73 kbp DNA from the colourless flagellate Astasia longa . Curr Genet 17, 433–438 (1990). https://doi.org/10.1007/BF00334524

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  • DOI: https://doi.org/10.1007/BF00334524

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