Crystal structures of ferredoxin variants exhibiting large changes in [Fe-S] reduction potential.
Elucidating how proteins control the reduction potentials (E0') of [Fe--S] clusters is a longstanding fundamental problem in bioinorganic chemistry. Two site-directed variants of Azotobacter vinelandii ferredoxin I (FdI) that show large shifts in [Fe--S] cluster E0' (100--200 mV versus standard hydrogen electrode (SHE)) have been characterized. High resolution X-ray structures of F2H and F25H variants in their oxidized forms, and circular dichroism (CD) and electron paramagnetic resonance (EP...Expand abstract
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