– AKTide-2T TFA, serving as an optimal in vitro substrate for AKT, demonstrates competitive inhibition of histone H2B phosphorylation with a Ki value of 12 nM. It effectively mimics the optimal phosphorylation sequence of Akt and acts as an inhibitory peptide, distinct from the wildtype AKTide due to the absence of Thr at the S22 position [1].