Abstract
Two phycocyanin (PC) operons, each containing α- and β-subunit genes, have been isolated from the unicellular cyanobacterium Anacystis nidulans R2. Using oligodeoxyribonucleotide probes for the PC-coding regions, three PstI fragments were obtained and shown to contain the two operons, which are 2.7 kb apart, with a proposed gene order of 5′-( β I - α I )-( β II - α II )-3′. The nucleotide sequences of both α-subunit genes are identical, as are the β-sequences and the 51-bp intergenic regions. However, significant nucleotide sequence differences are found in both the 5' and 3' untranslated regions of the two operons. Two mRNA species of 1.65 and 1.5 kb were detected in A. nidulans R2 RNA when probed with either the α-specific or the β-specific probe. The results demonstrate the existence of two PC operons which are both transcriptionally active.
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