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. 2019 Jan 30;95(4):fiz015. doi: 10.1093/femsec/fiz015

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© FEMS 2019.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 8. — Model for Fe(II) oxidation in the Zetaproteobacteria modified from Barco et al. (2015). An electron from Fe(II) is passed from Cyc2 to a periplasmic electron carrier (Cyc1 and/or other c-type cytochrome) before being passed to the terminal oxidase (cbb₃- or aa₃-type cytochrome c oxidases), generating a proton motive force. For reverse electron transport, the electron from the periplasmic carrier is passed to the bc₁ complex or alternative complex III (ACIII) before being passed to the quinone pool (Q) where it is used to regenerate NADH.