Plant Physiol. Drug Metab Dispos
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Plant Physiology 85:751-756 (1987)
© 1987 American Society of Plant Biologists

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Metabolism and Enzymology

Evaluation of Reductive Release as a Mechanism for Iron Uptake from Ferrioxamine B by Chlorella vulgaris

F. C. Thomas Allnutt1 and Walter D. Bonner, Jr.2

Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, Pennsylvania 19104

The involvement of ferric reduction in the iron uptake mechanism of iron-stressed Chlorella vulgaris from ferrioxamine B was investigated. Some comparative data for ferric-citrate was also obtained. EPR and a spectrophotometric assay were used to measure Fe3+ reduction. These two methods differed in the absolute quantity but not in effectors of ferric reduction. The mechanism governing ferric reduction was investigated by use of respiratory inhibitors, uncouplers, alternative electron acceptors, and ATPase inhibitors. Reduction appears to play a role in iron uptake from both Fe3+-deferrioxamine B and Fe3+-citrate; however, the involvement of photoreduction in Fe3+-citrate uptake implies multiple reductive mechanisms could be involved.

1 Supported by Public Health Service National Research Service Award 5-T32-GM07229-10. Present address: Biology Department, Purdue University, West Lafayette, IN 47907.

2 Supported by National Science Foundation grant PCM 79-14596.




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Copyright © 1987 by the American Society of Plant Biologists