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

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…

• UD
  U.S. Department of Energy

  Awards: DE-AC05, DE-AC05-76RLO1830
• B
  Battelle

  Awards: DE-AC05-76RLO1830, DE-AC05
• PN
  Pacific Northwest National Laboratory

  Award: DE-AC05-76RLO1830