Abstract
Cyanophora paradoxa is a flagellated protozoan which possesses unusual, chloroplast-like organelles referred to as cyanelles. The psbE and psbF genes, which encode the two apoprotein subunits of cytochrome b-559, have been cloned from the cyanelle genome of C. paradoxa. The complete nucleotide sequences of these genes and their flanking sequences were determined by the chain-termination, dideoxy method. The psbE gene is composed of 75 codons and predicts a polypeptide of 8462 Da that is seven to nine residues smaller than most other psbE gene products. The psbF gene consists of 43 codons and predicts a polypeptide of 4761 Da. Two open reading frames, whose sequences are highly conserved among cyanobacteria and numerous higher plants, were located in the nucleotide sequence downstream from the psbF gene. The first open reading frame, denoted psbI, is composed of 39 codons, while the second open reading frame, denoted psbJ, is composed of 41 codons. The predicted amino acid sequences of the psbI and psbJ gene products predict proteins of 5473 and 3973 Da respectively. These proteins are probably integral membrane proteins anchored in the membrane by a single, transmembrane alpha helix. The psbEFIJ genes are probably co-transcribed and constitute an operon as found for other organisms. Each of the four genes is preceded by a polypurine sequence which resembles the consensus ribsosome binding sequences for Escherichia coli.
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Cantrell, A., Bryant, D.A. Nucleotide sequence of the genes encoding cytochrome b-559 from the cyanelle genome of Cyanophora paradoxa . Photosynth Res 16, 65–81 (1988). https://doi.org/10.1007/BF00039486
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DOI: https://doi.org/10.1007/BF00039486