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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
general
Iodide accumulation provides kelp with an inorganic antioxidant impacting atmospheric chemistry
Proceedings of the National Academy of Sciences of the United States of America, Volume 105, No. 19, Year 2008
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Description
Brown algae of the Laminariales (kelps) are the strongest accumulators of iodine among living organisms. They represent a major pump in the global biogeochemical cycle of iodine and, in particular, the major source of iodocarbons in the coastal atmosphere. Nevertheless, the chemical state and biological significance of accumulated iodine have remained unknown to this date. Using x-ray absorption spectroscopy, we show that the accumulated form is iodide, which readily scavenges a variety of reactive oxygen species (ROS). We propose here that its biological role is that of an inorganic antioxidant, the first to be described in a living system. Upon oxidative stress, iodide is effluxed. On the thallus surface and in the apoplast, iodide detoxifies both aqueous oxidants and ozone, the latter resulting in the release of high levels of molecular iodine and the consequent formation of hygroscopic iodine oxides leading to particles, which are precursors to cloud condensation nuclei. In a complementary set of experiments using a heterologous system, iodide was found to effectively scavenge ROS in human blood cells. © 2008 by The National Academy of Sciences of the USA.
Authors & Co-Authors
Küpper, Frithjof Christian
United Kingdom, Oban
The Scottish Association for Marine Science
Germany, Konstanz
Universität Konstanz
United States, Santa Barbara
University of California, Santa Barbara
Carpenter, Lucy J.
United Kingdom, York
University of York
McFiggans, G. B.
United Kingdom, Manchester
The University of Manchester
Palmer, Carl J.
United Kingdom, York
University of York
South Africa, Cape Town
University of Cape Town
Waite, Tim J.
United States, Newark
College of Earth, Ocean and Environment
Boneberg, Eva Maria
Germany, Konstanz
Universität Konstanz
Switzerland, Kreuzlingen
Biotechnology Institute Thurgau
Woitsch, Sonja
Germany, Konstanz
Universität Konstanz
Weiller, Markus
Germany, Konstanz
Universität Konstanz
Abela, Rafael
Switzerland, Villigen
Paul Scherrer Institut
Grolimund, Daniel
Switzerland, Villigen
Paul Scherrer Institut
Potin, Philippe
France, Roscoff
Station Biologique de Roscoff
Butler, Alison
United States, Santa Barbara
University of California, Santa Barbara
Luther, George W.III I.
United States, Newark
College of Earth, Ocean and Environment
Kroneck, Peter M.H.
Germany, Konstanz
Universität Konstanz
Meyer-Klaucke, Wolfram
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Feiters, Martin C.
Netherlands, Nijmegen
Radboud Universiteit
Statistics
Citations: 337
Authors: 16
Affiliations: 12
Identifiers
Doi:
10.1073/pnas.0709959105
ISSN:
00278424
Research Areas
Environmental