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. 1983 Nov;73(3):724–728. doi: 10.1104/pp.73.3.724

Iron-Sulfur Centers and Activities of the Photosynthetic Electron Transport Chain in Iron-Deficient Cultures of the Blue-Green Alga Aphanocapsa1

Gerhard Sandmann 1,2, Richard Malkin 1
PMCID: PMC1066538  PMID: 16663290

Abstract

Cultures of the blue-green alga, Aphanocapsa, were grown under iron-limiting conditions and changes in concentration of redox components of the photosynthetic electron transport chain, particularly iron-sulfur centers, were monitored by spectroscopic methods. A moderate iron depletion (1/10 of the normal concentration) had little effect on photosynthetic electron transport reactions and growth. Nevertheless, the amount of membrane-bound non-heme iron decreased sharply, and ferredoxin was nearly totally replaced by a flavin-containing protein, flavodoxin. Severe iron-deficiency (1/100 of the normal concentration) was accompanied by growth inhibition and decreased rates of photosynthetic electron flow. The Photosystem I reaction center was most affected by iron depletion as evidenced by a decrease in the amounts of iron-sulfur centers A, B, and X. However, formation of other redox proteins, even those that do not contain iron, was also inhibited by severe iron deficiency.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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