Article
Site-directed mutagenesis of Azotobacter vinelandii ferredoxin I. Changes in [4Fe-4S] cluster reduction potential and reactivity.
The Journal of biological chemistry - 15 Nov 1991
Iismaa S E, Vázquez A E, Jensen G M, Stephens P J, Butt J N, Armstrong F A, Burgess B K
Abstract excerpt
We have used site-directed mutagenesis to obtain two variants of Azotobacter vinelandii ferredoxin I (AvFdI), whose x-ray structures are now available. In the C20A protein, a ligand to the [4Fe-4S] cluster was removed whereas in the C24A mutant a free cysteine next to that cluster was removed. Like native FdI, both mutants contain one [4Fe-4S] cluster and one [3Fe-4S] cluster. The structure of C24A is very...
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