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Heterodisulfide reductase (HDR) catalyzes the formation of coenzyme M (CoM–SH) and coenzyme B (CoB–SH) by the reversible reduction of the heterodisulfide, CoM–S–S–CoB. This reaction recycles the two thiol coenzymes involved in the final step of microbial methanogenesis. Electron paramagnetic resonance (EPR) and variable-temperature magnetic circular dichroism spectroscopic experiments on oxidized...
Heterodisulfide reductase (Hdr) from methanogenic Archaea catalyzes the reversible reduction of the heterodisulfide (CoM-S–S-CoB) of the methanogenic thiol coenzymes, coenzyme M (CoM-SH) and coenzyme B (CoB-SH). Upon reaction of the oxidized enzyme with CoM-SH a unique paramagnetic species is formed, which has been shown to be due to a novel type of [4Fe–4S] 3+ cluster. In this work, it was...
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