MDC1, a mediator of DNA damage response, recruits other repair proteins on double-strand break (DSB) sites. MDC1 is necessary for activating checkpoint kinases Chk1 and Chk2. It is unclear whether Chk1 interacts with MDC1. MDC1 also comprises many discrete domains. The role of the proline-serine-threonine (PST)-repeat domain of MDC1 in the DNA damage response is unclear. Here, we showed that MDC1 directly binds Chk1 through this PST-repeat region. Phosphorylation of Chk1 by ionizing radiation (IR) also required this PST-repeat domain. Degradation of intact MDC1 was accelerated depending on the PST-repeat domain after IR exposure. In the IR damage response, the PST-repeat-deleted MDC1 levels remained elevated with slow degradation. This abnormal regulation of MDC1 was F-box- and WD40 repeat-containing 7 (FBXW7)-dependent. The mutation of lysine 1413 within the PST-repeat of MDC1 deregulated MDC1 with or without damage. K1413R mutant and PST-deleted MDC1 displayed reduced ability to repair the damaged genome post-IR exposure. These results provide that the PST domain of MDC1 is involved in Chk1 and DNA repair activation. The findings suggest new insights into how MDC1 connects the checkpoint and DNA repair in the DNA damage response.
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