[formate-C-acetyltransferase]-activating enzyme activity
[formate-c-acetyltransferase]-activating enzyme activity
Catalysis of the reaction: S-adenosyl-L-methionine + dihydroflavodoxin + [formate C-acetyltransferase]-glycine = 5'-deoxyadenosine + L-methionine + flavodoxin semiquinone + [formate C-acetyltransferase]-glycin-2-yl radical.