Table III.

Steady State Kinetic Parameters of PAP

Polyadenylation Direction	Pyrophosphorolysis Direction
Ka = K4/(1 + Kc1)	Ka′ = K6/(1 + Kc2)
${\text{K}}_{\text{ia}}=\frac{1}{(1/{\text{K}}_1+1/{\text{K}}_7)}$	Kp = K5· (1 + K7/K1)/(1 + Kc2)
Kb = K3· (1 + K1/K7)/(1 + Kc1)	Kip = K8
Kib = K2