Formation of plastocyanin and cytochrome c-553 in different species of blue-green algae |
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Authors: | Gerhard Sandmann |
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Affiliation: | (1) Lehrstuhl für Physiologie und Biochemie der Pflanzen, Universität Konstanz, Postfach 5560, D-7750 Konstanz, Federal Republic of Germany |
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Abstract: | Fifteen species from different genera of blue-green algae have been examined for their formation of plastocyanin (PC) and cytochrome c-553 (cyt c-553) in high or low Cu media. In addition to species which contain only cyt c-553 and those which completely exchange their cyt c-553 by PC, a new regulatory type was detected in which this exchange was incomplete. By comparing different species, it could be shown that either this incomplete exchange of cyt c-553 by PC as well as lack of PC in some other blue-green algae is not caused by restricted Cu uptake but is due to different biosynthetic and regulatory properties. Occurrence of PC and cyt c-553 cannot be used as a taxonomic criterium to classify blue-green algae. However, formation of either one or both of these redox components fits well into a line of evolution of the photosynthetic apparatus from the blue-green algae via green algae to higher plants.Abbreviations PC plastocyanin; cyt c-553, cytochrome c-553 |
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Keywords: | Plastocyanin Cytochrome c-553 Cu regulation Blue-green algae cyanobacteria |
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