ArticleApplied and environmental microbiology2008
Secretion of flavins by Shewanella species and their role in extracellular electron transfer.
Article in Applied and environmental microbiology, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 188 papers.
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Who cites it
188 citing papers in PubMed, 868 citations in OpenAlex.
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- Overlap and differences between the inward and outward electron transfer pathways in Shewanella oneidensis.FEMS microbiology letters · 2025Article
- Isolation of a Tissierellaceae Bacterium Exhibiting a High Reduction Potential for Insoluble Indigo Dyes.Microbes and environments · 2025Article
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- Carbon source priority and availability limit bidirectional electron transfer in freshwater mixed culture electrochemically active bacterial biofilms.Bioresources and bioprocessing · 2023Article
128 more citing papers are in PubMed but not listed here.
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Authors and funding
4 authors at 2 institutions in 2 countries.
Funding
Abstract
Fe(III)-respiring bacteria such as Shewanella species play an important role in the global cycle of iron, manganese, and trace metals and are useful for many biotechnological applications, including microbial fuel cells and the bioremediation of waters and sediments contaminated with organics, metals, and radionuclides. Several alternative electron transfer pathways have been postulated for the reduction of insoluble extracellular subsurface minerals, such as Fe(III) oxides, by Shewanella species. One such potential mechanism involves the secretion of an electron shuttle. Here we identify for the first time flavin mononucleotide (FMN) and riboflavin as the extracellular electron shuttles produced by a range of Shewanella species. FMN secretion was strongly correlated with growth and exceeded riboflavin secretion, which was not exclusively growth associated but was maximal in the stationary phase of batch cultures. Flavin adenine dinucleotide was the predominant intracellular flavin but was not released by live cells. The flavin yields were similar under both aerobic and anaerobic conditions, with total flavin concentrations of 2.9 and 2.1 micromol per gram of cellular protein, respectively, after 24 h and were similar under dissimilatory Fe(III)-reducing conditions and when fumarate was supplied as the sole electron acceptor. The flavins were shown to act as electron shuttles and to promote anoxic growth coupled to the accelerated reduction of poorly crystalline Fe(III) oxides. The implications of flavin secretion by Shewanella cells living at redox boundaries, where these mineral phases can be significant electron acceptors for growth, are discussed.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.