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. 2018 Oct 11;8:15149. doi: 10.1038/s41598-018-33541-5

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Model of Fe⁰ corrosion enhanced by MIC hydrogenase. Two spheres of a [NiFe] hydrogenase represent the large and small subunits. A yellow patch on the large subunit represents the catalytic center that catalyzes reversible oxidation of H₂. Three circles on the small subunit represent proximal, mesial, and distal iron-sulfur clusters that transfer electrons from an electron donor to the catalytic center to form H₂. A red triangle on the small subunit represents a Tat signal peptide that is recognized by TatC. TatA and TatC constitute the TatA/TatC translocase through which the MIC hydrogenase is secreted through the cytoplasmic membrane. After completion of the translocation, the signal peptide is removed by a signal peptidase. The MIC hydrogenase localizes either on the surface of, or outside, the S-layer to receive electrons from Fe⁰.