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Nucleic Acids Research, 1984, Vol. 12, No. 6 2851-2859
© 1984

MOLECULAR BIOLOGY

The genes for the ribosomal proteins S12 and S7 are clustered with the gene for the EF-Tu protein on the chloroplast genome of Euglena gracilis

Paul-Etienne Montandon and Erhard Stutz

Laboratoire de Biochimie, Université de Neuchâtel Ch. de Chantemerle 18, CH-2000 Neuchâtel, Switzerland

Received January 30, 1984. Accepted February 27, 1984.

We characterize a DNA segment of the Euglena gracills chloroplast DNA fragment Eco.N by nucleotide sequencing and S1 nuclease analysis. We show that this region, which is upstream of the previously sequenced tuf A gene, contains the genes for the ribosomal proteins S12 and S7. The gene arrangment is 5'-rps 12–80 bp spacer-rps 7–174 bp spacer-tuf A, somewhat similar to the str operon of E. coli. The chloroplast S12 and S7 proteins contain 124 and 155 aminoacids, respectively, and are to 68% and 38% homologous with the corresponding E. coli proteins. The region is transcribed into a distronic mRNA of about 1.1 to 1.2 kb. The rps 12 and rps 7 genes, contrary to the tuf A gene, are not split.


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