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The amino acid sequences of both subunits of the C-phycocyanin from the thermophilic cyanobacterium Mastigocladus laminosus have been determined. The alpha-chain consists of 162 amino acid residues and has a molecular weight of 18000, whereas the beta-chain consists of 172 residues and has a molecular weight of 19400. For the first three quarters of their length the polypeptide chains are 31% homologous, whereas there is no significant homology in the final quarter up to the C-terminus. This could mean that the introduction of an additional chromophore binding site in the last quarter of the beta-chain during evolution was achieved via a large number of point mutations or by exchange of the whole C-terminal part in an ancestral gene.

The Complete Amino Acid Sequence of Both Subunits of C-Phycocyanin from the Cyanobacterium Mastigocladus laminosus