Table III. Kinetic parameters of ShMOMT2 with myricetin, kaempferide, rhamnetin, and SAM as substrates.

K_m and K_cat ± se values are averages of three assays.

Substrate	Km	Kcat	Kcat/Km
	μm	s−1	μm−1 s−1
Myricetina	1.68 ± 0.23	7.40 × 10−3 ± 9.03 × 10−4	4.41 × 10−3 ± 5.74 × 10−4
4’-Methylkaempferolb	2.27 ± 0.37	5.76 × 10−3 ± 8.89 × 10−4	2.53 × 10−3 ± 3.27 × 10−4
7-Methylquercetinc	2.30 ± 0.20	6.40 × 10−3 ± 5.22 × 10−4	2.78 × 10−3 ± 3.06 × 10−4
SAMd	18.71 ± 2.51	1.64 × 10−2 ± 2.33 × 10−3	8.75 × 10−4 ± 1.73 × 10−4

^aStructure in Figure 1.

^bKaempferide.

^cRhamnetin.

^d[Methyl-¹⁴C]SAM.