Double-Cubane [8Fe9S] Clusters: A Novel Nitrogenase-Related Cofactor in Biology

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Abstract

Three different types of electron-transferring metallo-ATPases are able to couple ATP hydrolysis to the reduction of low-potential metal sites, thereby energizing an electron. Besides the Fe-protein known from nitrogenase and homologous enzymes, two other kinds of ATPase with different scaffolds and cofactors are used to achieve a unidirectional, energetic, uphill electron transfer to either reduce inactive Co-corrinoid-containing proteins (RACE-type activators) or a second iron-sulfur cluster-containing enzyme of a unique radical enzymes family (archerases). We have found a new cofactor in the latter enzyme family, that is, a double-cubane cluster with two [4Fe4S] subclusters bridged by a sulfido ligand. An enzyme containing this cofactor catalyzes the ATP-dependent reduction of small molecules, including acetylene. Thus, enzymes containing the double-cubane cofactor are analogous in function and share some structural features with nitrogenases.

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Jeoung, J. H., Martins, B. M., & Dobbek, H. (2020, June 15). Double-Cubane [8Fe9S] Clusters: A Novel Nitrogenase-Related Cofactor in Biology. ChemBioChem. Wiley-VCH Verlag. https://doi.org/10.1002/cbic.202000016

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