Table 2.

Changes in the α-band positions of Co²⁺Cbl and Co²⁺Cbi⁺ caused by the addition of LrPduO in the absence and presence of co-substrate ATP, as determined from the 4.5 K Abs spectra in Figures 2 and 4^a

Species	Free Corrinoid	+ LrPduO	+ LrPduO/ATP
Co2+Cbl	21010 cm−1 (476.0 nm)	21050 cm−1 (475.0 nm)	21480 cm−1 (465.5 nm)
Co2+Cbi+	21250 cm−1 (470.5 nm)	21250 cm−1 (470.5 nm)	21480 cm−1 (465.5 nm)

^aNote that a blue-shift of the α-band reflects a weakening of the axial ligand–Co²⁺corrinoid bonding interaction.