Here, Li, Lu, Xia and colleagues identify the maternal complex MPU (PADI6–UHRF1–UBE2D), determine its cryo-electron microscopy structure and show that PADI6 maintains oocyte proteostasis by sequestering UBE2D with the assistance of UHRF1, thereby inhibiting protein ubiquitination. The study, thus, provides a molecular mechanism underlying PADI6-associated female infertility.
- Jinhong Li
- Yuechao Lu
- Dong Deng