Abstract
The gene for the small subunit of ribulose-1,5-bisphosphate carboxylase (Rubisco) is located in the large single-copy region of the plastid genome of the chlorophyll c-containing alga Cryptomonas Φ. The coding sequence is 417 base pairs long, encoding a protein of 139 amino acids, considerably longer than most other small subunit proteins. It is found 83 base pairs downstream from the gene for the large subunit and is cotranscribed with it. An 18 base pair perfect inverted repeat is located 8 base pairs beyond the termination codon. Sequence analysis shows the gene to be more closely related to cyanobacterial and cyanelle small-subunit genes than to those of green algae or land plants. This is the first reported sequence of a Rubisco small-subunit gene which is plastid-encoded and it exhibits a number of unique features. The derived amino acid sequence shows extensive similarity to a partial amino acid sequence from a brown alga, indicating that this gene will be of major interest as a probe for the small subunit genes in other algae and for determining possible evolutionary ancestors of algal plastids.
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Douglas, S.E., Durnford, D.G. The small subunit of ribulose-1,5-bisphosphate carboxylase is plastid-encoded in the chlorophyll c-containing alga Cryptomonas Φ. Plant Mol Biol 13, 13–20 (1989). https://doi.org/10.1007/BF00027331
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DOI: https://doi.org/10.1007/BF00027331