Abstract
Polycomb group (PcG) proteins control development and cell proliferation through chromatin-mediated transcriptional repression. We describe a transcription-independent function for PcG protein Posterior sex combs (PSC) in regulating the destruction of cyclin B (CYC-B). A substantial portion of PSC was found outside canonical PcG complexes, instead associated with CYC-B and the anaphase-promoting complex (APC). Cell-based experiments and reconstituted reactions established that PSC and Lemming (LMG, also called APC11) associate and ubiquitylate CYC-B cooperatively, marking it for proteosomal degradation. Thus, PSC appears to mediate both developmental gene silencing and posttranslational control of mitosis. Direct regulation of cell cycle progression might be a crucial part of the PcG system's function in development and cancer.
| Original language | English |
|---|---|
| Pages (from-to) | 744-747 |
| Number of pages | 4 |
| Journal | Science |
| Volume | 336 |
| Issue number | 6082 |
| DOIs | |
| Publication status | Published - 11 May 2012 |
ASJC Scopus subject areas
- General Medicine
- General