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Table 1 Kinetic parameters for MTHFD2 5,10-CH2-THF dehydrogenase activity. 5,10-CH2-THF kinetic parameters were determined using saturating concentrations of NAD+ (1.0 mM) or NADP+ (6.0 mM). When NAD+ was used, potassium phosphate (25 mM) and MgCl2 (5 mM) were also included

From: Human mitochondrial MTHFD2 is a dual redox cofactor-specific methylenetetrahydrofolate dehydrogenase/methenyltetrahydrofolate cyclohydrolase

 

CH2-H4PteGlu1

CH2-H4PteGlu5

 

KM (μM)

kcat (s−1)

kcat/KM (s−1 μM−1)

KM (μM)

kcat (s−1)

kcat/KM (s−1 μM−1)

NAD+-dependent

133 ± 20

12.4 ± 0.71

0.093

359 ± 32

15.4 ± 0.55

0.043

NADP+-dependent

123 ± 24

1.5 ± 0.11

0.012

302 ± 35

6.4 ± 0.29

0.021