Required for the maturation of the [FeFe]-hydrogenase HydA (By similarity). Catalyzes the reductive cleavage of S-adenosyl-L-methionine (in vitro), suggesting it may contribute to the biosynthesis of an essential sulfur-containing ligand that binds to the hydrogenase active site [2Fe-2S] cluster (PubMed:16137685). Binds 1 [4Fe-4S] cluster. The cluster is coordinated with 3 cysteines and an exchangeable S-adenosyl-L-methionine. Binds 1 [2Fe-2S] cluster. Monomer. Belongs to the radical SAM superfamily. HydE family.