The electrophoretic isolation and partial characterization of three chlorophyll-protein complexes from blue-green algae |
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Authors: | Sally Reinman J.Philip Thornber |
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Affiliation: | Department of Biology and Molecular Biology Institute, University of California, Los Angeles, CA 90024, U.S.A. |
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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-chlorophylla-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. |
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Keywords: | Chlorophyll-protein complexes Photosynthesis Photosystem II Heterocyst (Blue-green alga, Cyanobacteria) CPI To whom all correspondence should be sent. |
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