title: The electrophoretic isolation and partial characterization of three chlorophyll-protein complexes from blue-green algae.
abstract: Three chlorophyll-protein complexes have been resolved from blue-green algae using an improved procedure for membrane solubilization and electrophoretic fractionation. One complex has a red absorbance maximum of 676 nm and a molecular weight equivalency of 255 000 +/- 15 000. A second complex has an absorbance maximum of 676 nm, a molecular weight equivalency of 118 000 +/- 8000, and resembles the previously described P-700-chlorophyll a-protein (CPI) of higher plants and algae. The third chlorophyll-protein has a red absorbance maximum of 671 nm and a molecular weight equivalency of 58 000 +/- 5000. Blue-green algal membrane fractions enriched in Photosystem I and heterocyst cells do not contain this third chlorophyll-protein, whereas Photosystem II-enriched membrane fractions and vegetative cells do. A component of the same spectral characteristics and molecular weight equivalency was also observed in chlorophyll b-deficient mutants of barley and maize. It is hypothesized that this third complex is involved in some manner with Photosystem II.
mesh_terms: D002734:Chlorophyll / Q000032:analysis*; D000458:Cyanobacteria / Q000032:analysis*; D004591:Electrophoresis, Polyacrylamide Gel; D008970:Molecular Weight; D010940:Plant Proteins / Q000032:analysis*; D013045:Species Specificity; D013053:Spectrophotometry
chemical_list: D010940:Plant Proteins; D002734:Chlorophyll