The PcG protein hPc2 interacts with the N-terminus of histone demethylase JARID1B and acts as a transcriptional co-repressor.
JARID1B (jumonji AT rich interactive domain 1B) is a large nuclear protein that is highly expressed in breast cancers and is proposed to function as a repressor of gene expression. In this paper, a phage display screen using the N-terminus of JARID1B as bait identified one of the JARID1B interacting ... proteins, namely PcG protein (Polycomb group) hPc2. We demonstrated that the C-terminal region, including the COOH box, was required for the interaction with the N-terminus of JARID1B. In a reporter assay system, co-expression of JARID1B with hPc2 significantly enhanced the transcriptional repression. These results support a role for hPc2 acting as a transcriptional co-repressor.
Mesh Terms:
Cell Line, Tumor, DNA-Binding Proteins, Humans, Nuclear Proteins, Oxidoreductases, N-Demethylating, Peptide Library, Protein Binding, Repressor Proteins, Transcription, Genetic
Cell Line, Tumor, DNA-Binding Proteins, Humans, Nuclear Proteins, Oxidoreductases, N-Demethylating, Peptide Library, Protein Binding, Repressor Proteins, Transcription, Genetic
BMB Rep
Date: Mar. 31, 2009
PubMed ID: 19336002
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