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Fe-only hydrogenases contain a di-iron active site complex, in which the two Fe atoms have carbon monoxide and cyanide ligands and are linked together by a putative di(thiomethyl)amine molecule. We have cloned, purified and characterized the HydE and HydG proteins, thought to be involved in the biosynthesis of this peculiar metal site, from the thermophilic organism Thermotoga maritima. The HydE protein...
Biotin synthase (BioB), an iron-sulfur enzyme, catalyzes the last step of the biotin biosynthesis pathway. The reaction consists in the introduction of a sulfur atom into two non-activated C-H bonds of dethiobiotin. Substrate radical activation is initiated by the reductive cleavage of S-adenosylmethionine (AdoMet) into a 5'-deoxyadenosyl radical. The recently described pyridoxal 5'-phosphate-bound...
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