Summary
The 5S ribosomal RNAs from the cell cytoplasm and cyanelle (photosynthetic organelle) ofCyanophora paradoxa have been isolated and sequenced. The cellular and cyanelle 5S rRNAs were 119 and 118 nucleotides in length, respectively. Both RNAs exhibited typical 5S secondary structure, but the primary sequence of the cellular species was clearly eukaryotic in nature, while that of the organellar species was prokaryotelike. The primary sequence of the cyanellar 5S rRNA was most homologous to cyanobacterial 5S sequences, yet possessed secondary-structural features characteristic of higher-plant chloroplast 5S rRNAs. Both sequence comparison and structural analysis indicated an evolutionary position for cyanelle 5S rRNA intermediate between blue-green alga and chloroplast 5S rRNAs.
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Contribution from the Department of Biochemistry, School of Agriculture and Life Sciences and School of Physical and Mathematical Sciences, North Carolina State University, Raleigh, North Carolina. This is paper no. 10259 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh, North Carolina 27695-7601, USA
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Maxwell, E.S., Liu, J. & Shively, J.M. Nucleotide sequences ofCyanophora paradoxa cellular and cyanelle-associated 5S ribosomal RNAs: The cyanelle as a potential intermediate in plastid evolution. J Mol Evol 23, 300–304 (1986). https://doi.org/10.1007/BF02100638
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DOI: https://doi.org/10.1007/BF02100638