Turnover of WT RCN anSMEcpe with Kp18Thr or Kp18alloThr. A) Time-dependent formation of 5′-dA (closed triangles) and disappearance of Kp18Thr (closed squares). Reaction mixtures contained 100 μM anSMEcpe, 1 mM SAM, 0.5 mM Kp18Thr, and 3 mM DT. Vmax/[ET] values for 5’-dA formation and Kp18Thr disappearance are 0.29 min-1 and 0.11 min-1, respectively. B) Time-dependent formation of 5′-dA (closed triangles) and disappearance of Kp18alloThr (closed squares). Reaction mixtures contained 100 μM anSMEcpe, 1 mM SAM, 0.5 mM Kp18alloThr, and 3 mM DT. Vmax/[ET] values for 5’-dA formation and Kp18alloThr disappearance are 0.07 min-1 and 0.007 min-1, respectively.