A DISC ELECTROPHORETIC STUDY OF PROTEINS OF BLUE-GREEN ALGAE

Proteins extracted from twenty-one cultures representing fourteen strains of blue-green algae were subjected to disc electrophoresis. Phycocyanin was visible on gels of all species and phycoerythrin on gels of seven species. All extracts gave substantially similar protein patterns although minor differences separate Microcystis aeruginosa, Chlorogloea fritschii, and especially Anacystis nidulans, both from each other and from the other species examined. A set of three protein bands was absent from cultures grown on a medium free of combined nitrogen, but present on similar cultures receiving such additions. However, the bands were also absent from two cultures grown with a combined nitrogen source when incubated at a relatively low light intensity. © 1970.