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Kinase activity assays using microfluidic electrophoretic mobility shift assays (MMSA): Phosphorylation of a fluorescently-labeled substrate peptide by PKA-Cα was monitored over a concentration range of inhibitor peptides 6 and 8 as well as PKI1–24. Both 6 and 8 were found to have IC50 values that compare to the non-modified parent control, PKI1–24, thereby indicating that the introduction of a staple does not impair its inhibitory activity on PKA-Cα.
