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. 2019 Dec 30;295(6):1598–1612. doi: 10.1074/jbc.RA119.011547

Table 1.

Kinetics parameters for recombinant NnOMT1 (6OMT) and NnOMT5 (6OMT and 7OMT) determined at a fixed saturating concentration of SAM

Values represent the mean ± S.D. of three independent measurements.

Enzyme Substrate Km Vmax kcat kcat/Km
μm nmol min1 mg1 protein s1 m1 s1
NnOMT1 (R,S)-Norcoclaurine 20 ± 2 52 ± 2 0.0336 1686
NnOMT5 (R,S)-Norcoclaurine 152 ± 36 9 ± 1 0.0058 38
(S)-N-Methylcoclaurine 13 ± 3 30 ± 2 0.0191 1465