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What's your poison? Hydrogenases catalyze the reversible formation of dihydrogen from two electrons and two protons. The maturation of the FeFe-hydrogenase active-site cofactor (H cluster) requires three gene products, HydE, HydF, and HydG. Cyanide has been characterized as one of the products of tyrosine cleavage by the S-adenosylmethionine-dependent enzyme HydG, clarifying its role in H-cluster biosynthesis. DOA=deoxyadenosine.
Driesener et al. (2010) studied this question.