Summary
The 4S RNA of cyanelles from Cyanophora paradoxa strain LB 555 UTEX was fractionated by two-dimensional gel electrophoresis. Individual tRNA species were identified by aminoacylation, labeled in vitro and hybridized to restriction endonuclease fragments of cyanelle DNA. Hybridization experiments, using individual tRNA species, have revealed the location of two tRNA genes, coding for tRNAAla and tRNAIle, in each of the two spacer segments separating the 16S and 23S rRNA genes on the two inverted repeats (10 kbp each) and three tRNA genes in the small single-copy region (17 kbp) separating the two inverted repeats. A minimum of 14 tRNA genes in the large single-copy region (88.5 kbp) has also been found.
Heterologous hybridization studies, using cyanelle tRNAs and chloroplast DNA from spinach, broad bean, or maize, indicate a high degree of homology between some tRNAs from cyanelles and chloroplasts.
Although cyanelles are often condisered as having evolved from endosymbiotic cyanobacteria, the organization of tRNA genes on cyanelle DNA and the results of heterologous hybridization studies show that cyanelles are related to higher plant chloroplasts.
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Communicated by J. Schell
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Kuntz, M., Crouse, E.J., Mubumbila, M. et al. Transfer RNA gene mapping studies on cyanelle DNA from Cyanophora paradoxa . Molec. Gen. Genet. 194, 508–512 (1984). https://doi.org/10.1007/BF00425566
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DOI: https://doi.org/10.1007/BF00425566