AMINO ACID COMPOSITION AND C-TERMINAL RESIDUES OF ALGAL BILIPROTEINS

Abstract

R-phycoerythrin from Ceramium rubrum and C-phycocyanin from Nostoc muscorum have been obtained in purified form by fractional crystallization, followed by chromatography and gel-filtration. The amino-acid composition of both chromoproteins was determined; 85% of the total weight of both was recovered as amino-acids. Alanine was identified as the only C-terminal amino-acid of R-phycoerythrin, each molecule of which contained about 12 terminal groups. Serine was identified as the only C-terminal group of C-phycocyanin.