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Mol. Cell. Biol., 07 1997, 4105-4113, Vol 17, No. 7
DP Satijn, MJ Gunster, J van der Vlag, KM Hamer, W Schul, MJ Alkema, AJ Saurin, PS Freemont, R van Driel and AP Otte
The Polycomb (Pc) protein is a component of a multimeric, chromatin-
associated Polycomb group (PcG) protein complex, which is involved in
stable repression of gene activity. The identities of components of the PcG
protein complex are largely unknown. In a two-hybrid screen with a
vertebrate Pc homolog as a target, we identify the human RING1 protein as
interacting with Pc. RING1 is a protein that contains the RING finger
motif, a specific zinc-binding domain, which is found in many regulatory
proteins. So far, the function of the RING1 protein has remained enigmatic.
Here, we show that RING1 coimmunoprecipitates with a human Pc homolog, the
vertebrate PcG protein BMI1, and HPH1, a human homolog of the PcG protein
Polyhomeotic (Ph). Also, RING1 colocalizes with these vertebrate PcG
proteins in nuclear domains of SW480 human colorectal adenocarcinoma and
Saos-2 human osteosarcoma cells. Finally, we show that RING1, like Pc, is
able to repress gene activity when targeted to a reporter gene. Our
findings indicate that RING1 is associated with the human PcG protein
complex and that RING1, like PcG proteins, can act as a transcriptional
repressor.
Copyright © 1997, American Society for Microbiology
RING1 is associated with the polycomb group protein complex and acts as a transcriptional repressor
E.C. Slater Institute, University of Amsterdam, The Netherlands.
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