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Recruitment ofDrosophilaPolycomb-group proteins by Polycomblike, a component of a novel protein complex in larvae

doi: 10.1242/dev.016006
pmid: 18216170
Recruitment ofDrosophilaPolycomb-group proteins by Polycomblike, a component of a novel protein complex in larvae
Polycomb-group (PcG) proteins are highly conserved epigenetic transcriptional repressors that play central roles in numerous examples of developmental gene regulation. Four PcG repressor complexes have been purified from Drosophila embryos: PRC1, PRC2, Pcl-PRC2 and PhoRC. Previous studies described a hierarchical recruitment pathway of PcG proteins at the bxd Polycomb Response Element (PRE) of the Ultrabithorax(Ubx) gene in larval wing imaginal discs. The DNA-binding proteins Pho and/or Phol are required for target site binding by PRC2, which in turn is required for chromosome binding by PRC1. Here, we identify a novel larval complex that contains the PcG protein Polycomblike (Pcl) that is distinct from PRC1 and PRC2 and which is also dependent on Pho and/or Phol for binding to the bxd PRE in wing imaginal discs. RNAi-mediated depletion of Pcl in larvae disrupts chromosome binding by E(z), a core component of PRC2, but Pcl does not require E(z) for chromosome binding. These results place the Pcl complex(PCLC) downstream of Pho and/or Phol and upstream of PRC2 and PRC1 in the recruitment hierarchy.
- Amridge University United States
Cell Nucleus, Polycomb Repressive Complex 1, Genome, Gene Expression Regulation, Developmental, Chromatin, Chromosomes, Repressor Proteins, Larva, Chromatography, Gel, Animals, Drosophila Proteins, Wings, Animal, Drosophila, Protein Binding
Cell Nucleus, Polycomb Repressive Complex 1, Genome, Gene Expression Regulation, Developmental, Chromatin, Chromosomes, Repressor Proteins, Larva, Chromatography, Gel, Animals, Drosophila Proteins, Wings, Animal, Drosophila, Protein Binding
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