Figure 3. Characterization of P. cubensis SahH.Michaelis-Menten kinetics of SahH A) in hydrolytic direction (SAH as substrate),a nd synthetic direction with B) AdoorC )HCy as substrates.D)Impact of free NAD + on SahH activity.Catalytic activity in samples not supplemented with NAD + is probably due to carryover of enzyme-boundco-substrate from the heterologous protein production host.