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. 2018 Dec 4;9:2911. doi: 10.3389/fmicb.2018.02911

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Copyright © 2018 Schuchmann, Chowdhury and Müller.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Structure of the monomeric ferredoxin-dependent hydrogenase of C. pasteurianum. The 3D structure has been solved at 1.8 Å resolution (1FEH, RSCB PDB database). The monomeric enzyme contains the H-cluster typical for [FeFe] hydrogenases including the auxiliary [4Fe–4S] cluster. In addition, one [2Fe–2S]- and three [4Fe–4S] clusters are bound in the enzyme (A). The iron–sulfur centers are arranged in a forked architecture with cluster FS2 being too far away from FS4C for direct electron transfer (B). FS2 and FS4C are both close enough to FS4B for electron transfer. HC, H-cluster. Modified from Peters et al. (1998).