ISSN:
1432-072X
Keywords:
Cyanobacteria
;
Anabaena variabilis
;
Electron flow
;
Photosynthesis
;
Respiration
;
Cytochrome oxidase
;
Cytochrome c-553
;
Plastocyanin
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The cytochrome oxidase activity (oxygen uptake in the dark) of a membrane preparation from Anabaena variabilis was found to be stimulated by cytochrome c-553 and plastocyanin obtained from this alga. Cytochrome c from horse heart was as active as cytochrome c-553, whereas little or no stimulation of oxygen uptake was obtained with cytochromes c 2 from two Rhodospirillaceae, the plastidic cytochrome c-552 from Euglena, and plastocyanin from spinach. Cytochrome c-553 (A. variabilis) stimulated photosystem 1 activity in the same preparation much more than cytochrome c (horse heart). The results indicate that cytochrome c-553 and plastocyanin, besides their established function as electron donors of photosystem 1, participate in respiratory electron transport as reductants of a terminal oxidase. Photooxidation and dark oxidation show a different donor specificity.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00422541
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