title: A novel variety of 4.5 S RNA from Codium fragile chloroplasts.
abstract: An unusual new chloroplast RNA has been isolated and sequenced in the siphonous green alga, Codium fragile. This RNA is 94 nucleotides in length, has an unusually high A + U content (73%), contains no modified residues, and is as abundant as a single chloroplast tRNA species. Although this RNA is 4.5 S in size, it bears little sequence homology to the widely found and highly conserved 4.5 S RNAs present in the chloroplasts of higher plants. Nevertheless, this RNA may indeed by analogous to the higher plant 4.5 S RNAs, since the Codium 4.5 S RNA has the potential to form a secondary structure which in many respects is remarkably similar to that of known chloroplast 4.5 S RNAs, and hybridization data strongly suggests that the 4.5 S RNA is part of the ribosomal RNA operon, as is the case in higher plant chloroplasts.
mesh_terms: D001483:Base Sequence; D000460:Chlorophyta / Q000235:genetics*; D002736:Chloroplasts / Q000032:analysis*; D004262:DNA Restriction Enzymes / Q000378:metabolism; D009690:Nucleic Acid Conformation; D012313:RNA / Q000032:analysis*
chemical_list: D012313:RNA; D004262:DNA Restriction Enzymes