Reciprocal antagonism of PIN1-APC/CCDH1 governs mitotic protein stability and cell cycle entry

Nat Commun. 2024 Apr 15;15(1):3220. doi: 10.1038/s41467-024-47427-w.

Abstract

Induced oncoproteins degradation provides an attractive anti-cancer modality. Activation of anaphase-promoting complex (APC/CCDH1) prevents cell-cycle entry by targeting crucial mitotic proteins for degradation. Phosphorylation of its co-activator CDH1 modulates the E3 ligase activity, but little is known about its regulation after phosphorylation and how to effectively harness APC/CCDH1 activity to treat cancer. Peptidyl-prolyl cis-trans isomerase NIMA-interacting 1 (PIN1)-catalyzed phosphorylation-dependent cis-trans prolyl isomerization drives tumor malignancy. However, the mechanisms controlling its protein turnover remain elusive. Through proteomic screens and structural characterizations, we identify a reciprocal antagonism of PIN1-APC/CCDH1 mediated by domain-oriented phosphorylation-dependent dual interactions as a fundamental mechanism governing mitotic protein stability and cell-cycle entry. Remarkably, combined PIN1 and cyclin-dependent protein kinases (CDKs) inhibition creates a positive feedback loop of PIN1 inhibition and APC/CCDH1 activation to irreversibly degrade PIN1 and other crucial mitotic proteins, which force permanent cell-cycle exit and trigger anti-tumor immunity, translating into synergistic efficacy against triple-negative breast cancer.

MeSH terms

  • Anaphase-Promoting Complex-Cyclosome / metabolism
  • Cell Cycle / physiology
  • Cell Cycle Proteins* / genetics
  • Cell Cycle Proteins* / metabolism
  • Mitosis
  • NIMA-Interacting Peptidylprolyl Isomerase / genetics
  • NIMA-Interacting Peptidylprolyl Isomerase / metabolism
  • Phosphorylation
  • Protein Stability
  • Proteomics*

Substances

  • Anaphase-Promoting Complex-Cyclosome
  • Cell Cycle Proteins
  • NIMA-Interacting Peptidylprolyl Isomerase