Abstract
Chloroplasts of the unicellular flagellate eukaryote Euglena gracilis contain several copies of a circular 135–140-kilobase pair DNA1 which codes for chloroplast-specific stable RNAs (16S, 23S (refs 2, 3), 5S rRNAs4 and tRNAs5) and for an unknown number of chloroplast-specific proteins. The rRNA genes are located within three tandemly repeated DNA regions of approximately 5.6 kilobase pairs each6–8 and the arrangement of the structural genes within each repeat follows the prokaryotic pattern, being 5′-16S-23S-5S-3′ (ref. 9). Total chloroplast tRNA hybridizes to fragments of rDNA9 and it was suggested that the 16S–23S spacer region contains tRNA coding sequences as is observed in Escherichia coli10,11 and in spinach chloroplast12 rDNA. We have therefore analysed E. gracilis strain Z 16S–23S spacer DNA at the nucleotide level, hoping this would allow identification of tRNA genes together with the processing sites of the respective primary transcripts. Maize chloroplast 16S rDNA shows strong sequence homology with E. coli 16S rRNA13. Sequence analysis of a total spacer in E. gracilis should demonstrate whether such similarities are also preserved in the chloroplast rDNA spacer region, or if this region has suffered a higher genetic drift rate. The latter is suggested from the 189 bases which have been sequenced from the 2.4-kilobase pair rDNA spacer from maize chloroplasts14. Flanking sequences, coding for the 3′-terminal region of 16S rRNA and for the 5′-terminal region of 23S rRNA have also been sequenced, to compare the drift rates between the spacer and its adjacent structural genes.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Manning, J. E. & Richards, O. C. Biochim. biophys. Acta 259, 285–296 (1972).
Scott, N. S. J. molec. Biol. 81, 327–336 (1973).
Kopecka, H., Crouse, J. E. & Stutz, E. Eur. J. Biochem. 72, 525–535 (1977).
Gray, P. W. & Hallick, R. B. Biochemistry 18, 1820–1825 (1979).
Schwartzbach, S. D., Hecker, L. I. & Barnett, W. E. Proc. natn. Acad. Sci. U.S.A. 73, 1984–1988 (1976).
Gray, P. W. & Hallick, R. B. Biochemistry 17, 284–290 (1978).
Rawson, J. R. Y., Kushner, S. R., Vapnek, D., Alton, N. K. & Boerma, C. L. Gene 3, 191–209 (1978).
Jenni, B. & Stutz, E. Eur. J. Biochem. 88, 127–134 (1978).
Hallick, R. B., Gray, P. W., Chelm, B. K., Rushlow, K. E. & Orozco, E. M. Jr Chloroplast Development (eds Akoyunoglou, G. et al.) 619–622 (Elsevier, Amsterdam, 1978).
Young, R. A., Maklis, R. & Steitz, J. A. J. biol. Chem. 254, 3624–3271 (1979).
Sekya, T. & Nishimura, S. Nucleic Acids Res. 6, 575–592 (1979).
Bohnert, H. J. et al. FEBS Lett. 103, 52–56 (1979).
Schwarz, Z. & Kössel, H. Nature 283, 739–742 (1980).
Schwarz, Z. & Kössel, H. Nature 279, 520–522 (1979).
Knopf, U. C. & Stutz, E. Molec. gen. Genet. 163, 1–6 (1978).
Graf, L., Schwarz, Z., Kössel, H. & Stutz, E. Experientia 86, 34 (1980).
Brosius, J., Palmer, M. L., Kennedy, P. J. & Noller, H. F. Proc. natn. Acad. Sci. U.S.A. 75, 4801–4805 (1979).
Carbon, P., Ehresmann, C., Ehresmann, B. & Ebel, J. P. FEBS Lett. 94, 152–156 (1978).
Jenni, B. & Stutz, E. FEBS Lett. 102, 95–99 (1979).
Maxam, A. & Gilbert, W. Proc. natn. Acad. Sci. U.S.A. 74, 560–564 (1977).
Zablen, L. B., Kissil, M. S., Woese, C. R. & Buetow, D. E. Proc. natn. Acad. Sci. U.S.A. 72, 2418–2422 (1975).
Woese, C. R. et al. Nature 254, 83–86 (1975).
Shine, J. & Dalgarno, L. Proc. natn. Acad. Sci. U.S.A. 71, 1342–1346 (1974).
Steitz, J. A. Biological Regulation and Control (ed. Goldberger, R.) 349–399 (Plenum, New York, 1979).
Hartley, M. R., Head, C. W. & Gardiner, J. Acides Nucléiques et Synthèse des Protéines chez les Végétaux (eds Bogorad, L. & Weil, J. H.) 419–423 (CNRS, Paris, 1977).
Bohnert, H.-J., Driesel, A. J. & Herrmann, R. G. Acides Nucléiques et Synthèse des Protéines chez les Végétaux (eds Bogorad, L. & Weil, J. H.) 213–218 (CNRS, Paris, 1977).
Rochaix, J. D. & Malnoe, P. Cell 15, 661–670 (1978).
Wollgiehn, R. & Parthier, B. Plant Sci. Lett. 16, 203–210 (1979).
Sprinzl, M., Grueter, F., Spelzhaus, A. & Gauss, D. H. Nucleic Acids Res. 8, r1–r22 (1980).
Abelson, J. A. Rev. Biochem. 48, 1035–1069 (1979).
Suddath, F. L. et al. Nature 248, 20–24 (1974).
Robertus, J. D. et al. Nature 250, 546–551 (1974).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Graf, L., Kössel, H. & Stutz, E. Sequencing of 16S–23S spacer in a ribosomal RNA operon of Euglena gracilis chloroplast DNA reveals two tRNA genes. Nature 286, 908–910 (1980). https://doi.org/10.1038/286908a0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/286908a0
This article is cited by
-
Genes for components of the chloroplast translational apparatus are conserved in the reduced 73-kb plastid DNA of the nonphotosynthetic euglenoid flagellate Astasia longa
Current Genetics (1994)
-
Loss of transfer RNA genes from the plastid 16S?23S ribosomal RNA gene spacer in a parasitic plant
Current Genetics (1992)
-
The chloroplast genome
Plant Molecular Biology (1992)
-
Structural features of the plastid ribosomal RNA operons of two red algae: Antithamnion sp. and Cyanidium caldarium
Plant Molecular Biology (1991)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.