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. 2015 Oct 12;43(20):9905–9917. doi: 10.1093/nar/gkv1020

Table 1. Steady-state kinetic constants for ATP-[32P]PPi exchange by T1 and T2 enzymes.

Thr Ser
KM (mM) kcat (s−1) kcat/KM (mM−1 s−1) KM (mM) kcat (s−1) kcat/KM (mM−1 s−1) Specificity factor (kcat/KM)Thr/(kcat/KM)Ser
T1 2.6 ± 0.3 10.0 ± 1.5 3.8 ± 0.7 274 ± 4 3.290 ± 0.014 0.0120 ± 0.0002 314
T2 0.22 ± 0.03 4.42 ± 0.13 20.1 ± 2.6 77 ± 14 3.6 ± 0.4 0.046 ± 0.010 436

Numbers indicate average ± standard deviation (n = 3).