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Secondary structure and phylogeny of the chloroplast 23S rRNA gene from the brown alga Pylaiella littoralis

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Abstract

The entire nucleotide sequence of a 23S rRNA gene from the brown alga Pylaiella littoralis (L.) Kjellm has been determined. The predicted length of the 23S rRNA is 2948 nucleotides, including the 4.5S rRNA-like region at the 3′ end of the molecule. The putative transcript has been folded into a secondary structure by comparison to existing structure models, and the predicted helical regions were inspected by identifying compensatory downstream base changes. The 23S rRNA secondary structure presented here has features that are unique to P. littoralis (no other chromophyte or red algal 23S rRNA sequences are yet available), but has none of the features specific to the chloroplast rRNAs of green plants and green algae. The Pylaiella sequence was aligned with analogous plastidial and eubacterial gene sequences, and the alignment was used to construct a phylogenetic tree. The plastidial sequences formed a coherent cluster closely associated with the 23S rRNA of the cyanobacterium Anacystis nidulans. Within the plastid group, the P. littoralis sequence was most closely related to that of Euglena gracilis confirming earlier analyses based upon 16S rRNA sequences.

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Somerville, C.C., Jouannic, S., Martin, W.F. et al. Secondary structure and phylogeny of the chloroplast 23S rRNA gene from the brown alga Pylaiella littoralis . Plant Mol Biol 21, 779–787 (1993). https://doi.org/10.1007/BF00027111

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  • DOI: https://doi.org/10.1007/BF00027111

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