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Microarray analysis of a microbe–mineral interaction

Olsson-Francis, K.; Van Houdt, R.; Mergeay, M.; Leys, N. and Cockell, C. S. (2010). Microarray analysis of a microbe–mineral interaction. Geobiology, 8(5) pp. 446–456.

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The weathering of volcanic minerals makes a significant contribution to the global silicate weathering budget, influencing carbon dioxide drawdown and long-term climate control. Basalt rocks may account for over 30% of the global carbon dioxide drawdown in silicate weathering. Micro-organisms are known to play a role in rock weathering yet the genomics and genetics of biological rock weathering are unknown. We apply DNA microarray technology to determine putative genes involved in weathering using the heavy metal-resistant organism, Cupriavidus metallidurans CH34; in particular we investigate the sequestering of iron. The results show that the bacterium does not depend on siderophores. Instead, the up-regulation of porins and transporters which are employed concomitantly with genes associated with biofilm formation suggests that novel passive and active iron uptake systems are involved. We hypothesize that these mechanisms induce rock weathering by changes in chemical equilibrium at the microbe–mineral interface, reducing the saturation state of iron. We also demonstrate that low concentrations of metals in the basalt induce heavy metal-resistant genes. Some of the earliest environments on the Earth were volcanic. Therefore, these results not only elucidate the mechanisms by which micro-organisms might have sequestered nutrients on the early Earth but also provide an explanation for the evolution of multiple heavy metal resistance genes long before the creation of contaminated industrial biotopes by human activity

Item Type: Journal Item
Copyright Holders: 2010 Blackwell Publishing Ltd
ISSN: 1472-4669
Project Funding Details:
Funded Project NameProject IDFunding Body
Investigations on the Interplanetary Transfer of MicroorganismsPP/E001408/1STFC (Science & Technology Facilities Council)
Not SetNot SetCAREX transfer of knowledge grant
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Item ID: 28715
Depositing User: Karen Olsson-Francis
Date Deposited: 09 May 2011 08:35
Last Modified: 07 Dec 2018 09:53
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