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Issue 4, 2016
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Surface binding, localization and storage of iron in the giant kelp Macrocystis pyrifera

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Abstract

Iron is an essential element for all living organisms due to its ubiquitous role in redox and other enzymes, especially in the context of respiration and photosynthesis. Although the iron uptake and storage mechanisms of terrestrial/higher plants have been well-studied, the corresponding systems in marine algae have received far less attention. While the iron many marine algae take up from the environment, irrespective of its detailed internalization mechanism, arrives at the cell surface by diffusion, there is growing evidence for more “active” means of concentrating this element prior to uptake. It has been well established in both laboratory and environmentally derived samples, that a large amount of iron can be “non-specifically” adsorbed to the surface of marine algae. While this phenomenon is widely recognized and has prompted the development of experimental protocols to eliminate its contribution to iron uptake studies, its potential biological significance as a concentrated iron storage source for marine algae is only now being recognized. In this study, using an interdisciplinary array of techniques, we show that the giant kelp Macrocystis pyrifera also displays significant cell surface bound iron although less than that seen with the related brown alga Ectocarpus siliculosus. The iron on the surface is likely bound to carboxylate groups and once inside the iron is found to localize differently depending on cell type. Iron appears to be stored in an as yet undefined mineral phase.

Graphical abstract: Surface binding, localization and storage of iron in the giant kelp Macrocystis pyrifera

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Publication details

The article was received on 04 Feb 2016, accepted on 18 Mar 2016 and first published on 18 Mar 2016


Article type: Paper
DOI: 10.1039/C6MT00027D
Citation: Metallomics, 2016,8, 403-411
  • Open access: Creative Commons BY license
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    Surface binding, localization and storage of iron in the giant kelp Macrocystis pyrifera

    E. P. Miller, H. Auerbach, V. Schünemann, T. Tymon and C. J. Carrano, Metallomics, 2016, 8, 403
    DOI: 10.1039/C6MT00027D

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