TABLE 1.

Specific activities of hATR and LrPduO using different electron sources for the adenosylation of cob(II)alamin

The concentrations of Fpr and PduS were at a one-to-one molar ratio to the concentrations of PduO-type ACA enzymes.

Reductant	Specific activity
	hATR	LrPduO
	nmol min−1 μg−1of enzyme
Ti(III)citrate	(4.9 ± 0.2) × 10−1	(2.5 ± 0.1) × 10−1
Dihydroflavins	(2.5 ± 0.1) × 10−1	(1.4 ± 0.1) × 10−1
Fpr	(7.2 ± 0.9) × 10−2	(4.5 ± 0.8) × 10−2
PduS	(2.6 ± 0.2) × 10−2	(2.3 ± 0.3) × 10−2