DNA-Dependent Protein Kinase Peptide Substrate 1mg 10mg/ml DNA-Dependent Protein Kinase (DNA PK) Peptide Substrate is a highly specific substrate for DNA-PK with the sequence Glu-Pro-Pro-Leu-Ser-Gln-Glu-Ala-Phe-Ala-Asp-Leu-Trp-Lys-Lys (1). The Km value