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The cyanelle genome of Cyanophora paradoxa encodes ribosomal proteins not encoded by the chloroplast genomes of higher plants
Author(s) -
Bryant Donald A.,
Stirewalt Veronica L.
Publication year - 1990
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(90)80026-f
Subject(s) - genome , biology , chloroplast , genetics , ribosomal protein , gene , ribosome , rna
The rpl35 , rpl20 , rpl5 , rps8 , and a portion of the rpl6 genes of the cyanelle genome of Cyanophora paradoxa have been cloned, mapped and sequenced. Homologs of the rpl35 , rpl5 , and rpl6 genes are not found in the chloroplasts of higher plants. The rpl35 and rpl20 genes most likely form a dicistronic operon which is located upstream from the apcE‐apcA‐apcB locus of the cyanelle and which is divergently transcribed from this locus. The rpl5 , rpl8 , and rpl6 genes probably form a part of a larger cluster of genes encoding components of the cyanellar ribosomes. These genes are organized in a fashion similar to that observed in all procaryotes examined to date, with the exception that the rpsl4 gene is not found between the rpl5 and rps8 coding sequences. Hypotheses concerning the origins of cyanelles and chloroplasts are discussed.