3-methyl-2-oxobutanoate dehydrogenase (ferredoxin) activity
3-methyl-2-oxobutanoate dehydrogenase (ferredoxin) activity
Catalysis of the reaction: 3-methyl-2-oxobutanoate + CoA + oxidized ferredoxin = S-(2-methylpropanoyl)-CoA + CO2 + reduced ferredoxin.