Respiration of metal (hydr)oxides by Shewanella and Geobacter: a key role for multihaem c-type cytochromes

By Liang Shi, T. Squier, J. Zachara, Jim K. Fredrickson. Molecular Microbiology, 2007

645 citations recorded by the source corpus.

Dissimilatory reduction of metal (e.g. Fe, Mn) (hydr)oxides represents a challenge for microorganisms, as their cell envelopes are impermeable to metal (hydr)oxides that are poorly soluble in water. To overcome this physical barrier, the Gram‐negative bacteria Shewanella oneidensis MR‐1 and Geobacter sulfurreducens have developed electron transfer (ET) strategies that require multihaem c‐type cytochromes (c‐Cyts). In S. oneidensis MR‐1, multihaem c‐Cyts CymA and MtrA are believed to transfer electrons from the inner membrane quinone/quinol pool through the periplasm to the outer membrane. The type II secretion system of S. oneidensis MR‐1 has been implicated in the reduction of metal (hydr)oxides, most likely by translocating decahaem c‐Cyts MtrC and OmcA across outer membrane to the surface of bacterial cells where they form a protein complex. The extracellular MtrC and OmcA can directly reduce solid metal (hydr)oxides. Likewise, outer membrane multihaem c‐Cyts OmcE and OmcS of G. sulfurreducens are suggested to transfer electrons from outer membrane to type IV pili that are hypothesized to relay the electrons to solid metal (hydr)oxides. Thus, multihaem c‐Cyts play critical roles in S. oneidensis MR‐1‐ and G. sulfurreducens‐mediated dissimilatory reduction of solid metal (hydr)oxides by facilitating ET across the bacterial cell envelope.

Subfields: Electrical and Electronic Engineering, Environmental Engineering, Geochemistry and Petrology

View Paper: https://www.semanticscholar.org/paper/e5f72c3d08d6a8fe730f7b775af48c5545370bb6

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Citations in the corpus

Microbial electron transport and energy conservation – the foundation for optimizing bioelectrochemical systems (2015, background): “For both bacteria outer-membrane cytochromes were identified as essential compounds to enable EET (Mehta et al., 2005; Shi et al., 2007, 2009; Breuer et al., 2015).”
Geobacter: the microbe electric's physiology, ecology, and practical applications. (2011, background): “seriously questioned (Shi et al., 2007) because there was no knownmechanism for electron transfer along protein filaments.”
Microbiological corrosion: mechanism, control and impact—a review (2017, neutral): “Metal-respiring bacteria require extracellular reduction of metal compounds, often in a biofilm matrix, as they cannot uptake these compounds into the cell [40].”
Corrosion of Iron by Sulfate-Reducing Bacteria: New Views of an Old Problem (2013, background): “It is assumed that direct electron uptake from iron involves outer membrane redox proteins such as c-type cytochromes (39), found in other microorganisms that interact with extracellular electron donors (94, 95) and acceptors (96, 97).”
Bacterial extracellular electron transfer in bioelectrochemical systems (2012, background): “Many excellent reviews focusing on the BDMR have been reported previously [12–15].”