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Papers In Press, published online ahead of print January 2, 2001
INSERM U453, Centre Leon Berard, Lyon 69373 Cedex 08
Corresponding Author: corbo{at}lyon.fnclcc.fr
We have previously reported the interaction of BTG1 and BTG2 with the mouse protein CAF1 (CCR4 associated factor 1) and suggested that these proteins may participate, through their association with CAF1, in transcription regulation. Here we describe the in vitro and in vivo association of these proteins with hPOP2, the human paralog of hCAF1. The physical and functional relationships between the BTG proteins and their partners hCAF1 and hPOP2 were investigated in order to find out how these interactions affect cellular processes, and in particular transcription regulation. We described their interaction regions and examined their expression in various human tissues. We also show functional data indicating their involvement in Estrogen Receptor
J. Biol. Chem, 10.1074/jbc.M008201200
Submitted on September 7, 2000
Revised on November 26, 2000
Accepted on January 2, 2001
Relationships of the antiproliferative proteins BTG1 and BTG2 with CAF1, the human homolog of a component of the yeast CCR4 transcriptional complex: involvement in estrogen receptor
signaling pathway
(ER
)-mediated transcription regulation. We found that BTG1 and BTG2, probably through their interaction with CAF1 or POP2 via a CCR4-like complex, can play both positive or negative roles in regulating the ER
function. In addition, our results indicate that two LxxLL motifs, referred to as nuclear receptor boxes, present in both BTG1 and BTG2, are involved in the regulation of ER
-mediated activation.
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