Photosynthetic electron transport, ATP synthesis and nitrogenase activity in isolated heterocysts of Anabaena cylindrica

Photosynthetic electron transport, ATP synthesis and nitrogenase activity in isolated heterocysts of Anabaena cylindrica

Isolated heterocysts of the N2-fixing blue-green alga Anabaena cylindrica contain the Photosystem I components P-700, bound and soluble ferredoxins and ferredoxin-NADP reductase. They also show Photosystem I activity being able to photoreduce both methylviologen and NADP when ascorbate + dichlorophe...

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Bibliographic Details
Published in:Biochimica et biophysica acta Vol. 423; no. 2; p. 189
Main Authors: Tel-Or, E, Stewart, W D
Format: Journal Article
Language:English
Published: Netherlands 16-02-1976
Subjects:
Adenosine Triphosphate - metabolism
Cyanobacteria - metabolism
Cytochromes - metabolism
Electron Transport
Ferredoxins - metabolism
NADH, NADPH Oxidoreductases - metabolism
Nitrogenase - metabolism
Photophosphorylation
Photosynthesis
Subcellular Fractions - metabolism
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Summary:Isolated heterocysts of the N2-fixing blue-green alga Anabaena cylindrica contain the Photosystem I components P-700, bound and soluble ferredoxins and ferredoxin-NADP reductase. They also show Photosystem I activity being able to photoreduce both methylviologen and NADP when ascorbate + dichlorophenol-indophenol acts as reductant. They photophosphorylate (64 munol ATP produced/mg chlorophyll a/h) and carry out oxidative phosphorylation (8.7 munol ATP produced/mg chlorophyll a/h). Ninety per cent of the total cell-free extract nitrogenase activity is located in the heterocyst fraction of aerobic cultures.
ISSN:0006-3002
DOI:10.1016/0005-2728(76)90177-8