arrA Is a Reliable Marker for As(V) Respiration
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- 15 October 2004
- journal article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 306 (5695) , 455
- https://doi.org/10.1126/science.1102374
Abstract
Arsenate [As(V)]-respiring bacteria affect the speciation and mobilization of arsenic in the environment. This can lead to arsenic contamination of drinking water supplies and deleterious consequences for human health. Using molecular genetics, we show that the functional gene for As(V) respiration, arrA , is highly conserved; that it is required for As(V) reduction to arsenite when arsenic is sorbed onto iron minerals; and that it can be used to identify the presence and activity of As(V)-respiring bacteria in arsenic-contaminated iron-rich sediments. The expression of arrA thus can be used to monitor sites in which As(V)-respiring bacteria may be controlling arsenic geochemistry.Keywords
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