期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 30, 页码 12331-12336出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201914873
关键词
electron transfer; Geobacter sulfurreducens; iron heme; silver nanoparticles; silver proteins
资金
- Swiss National Science Foundation [200020_172777, 200021_178827, 178650]
- Swiss National Science Foundation (NCCR Bioinspired Materials)
- Swiss Confederation
- Fribourg Center for Nanomaterials
- University of Fribourg
- Fundacao para a CiTHORNncia e a Tecnologia (FCT-MCTES) [PTDC/BIA-BQM/31981/2017, UID/Multi/04378/2019]
- Fundação para a Ciência e a Tecnologia [PTDC/BIA-BQM/31981/2017, UID/Multi/04378/2019] Funding Source: FCT
- Swiss National Science Foundation (SNF) [200021_178827] Funding Source: Swiss National Science Foundation (SNF)
Anaerobic microorganisms of the Geobacter genus are effective electron sources for the synthesis of nanoparticles, for bioremediation of polluted water, and for the production of electricity in fuel cells. In multistep reactions, electrons are transferred via iron/heme cofactors of c-type cytochromes from the inner cell membrane to extracellular metal ions, which are bound to outer membrane cytochromes. We measured electron production and electron flux rates to 5x10(5) e s(-1) per G. sulfurreducens. Remarkably, these rates are independent of the oxidants, and follow zero order kinetics. It turned out that the microorganisms regulate electron flux rates by increasing their Fe2+/Fe3+ ratios in the multiheme cytochromes whenever the activity of the extracellular metal oxidants is diminished. By this mechanism the respiration remains constant even when oxidizing conditions are changing. This homeostasis is a vital condition for living systems, and makes G. sulfurreducens a versatile electron source.
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