DNA-PKCS Inhibitors

DNA-dependent protein kinase catalytic subunit (DNA-PKCS) is a crucial enzyme involved in the non-homologous end joining (NHEJ) pathway, a major mechanism responsible for repairing DNA double-strand breaks (DSBs) in eukaryotic cells. DSBs are among the most dangerous types of DNA damage, as they can lead to chromosomal rearrangements, deletions, or even cell death. The DNA-PKCS, along with the Ku70/Ku80 heterodimer, forms the DNA-PK holoenzyme, which is activated upon binding to the ends of DSBs. Once activated, DNA-PKCS phosphorylates several targets, including itself and other proteins involved in the NHEJ pathway, facilitating the repair process.

DNA-PKCS inhibitors are a class of molecules designed to specifically target and modulate the activity of the DNA-PKCS enzyme. By inhibiting DNA-PKCS, these compounds disrupt the NHEJ pathway, affecting the cell's ability to repair DSBs. The molecular structures of these inhibitors are diverse, reflecting the intricate nature of the enzyme's active and regulatory sites. Some inhibitors bind directly to the catalytic domain of DNA-PKCS, preventing its kinase activity, while others might interfere with its interaction with other components of the NHEJ machinery.