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Mi-2β is the main component of the nucleosome remodeling and deacetylase complex and plays an important role in epigenetic transcriptional repression. Here we show that the amino-terminal and carboxyl-terminal regions of Mi-2β have distinct transcriptional activities and bind to BRG1, a component of the SWI/SNF complex, and the RET finger protein (RFP), respectively. Analysis by luciferase reporter assay revealed that the amino-terminal region of Mi-2β has a strong transactivating ability, whereas its carboxyl-terminal region has transcriptional repressive activity. Co-localization and association of Mi-2, RFP, and histone deacetylase 1 suggested that these proteins cooperate in transcriptional repression. Furthermore, the functional importance of the association of Mi-2β and RFP was confirmed by using Rfp–/– fibroblasts. On the other hand, we demonstrated that Mi-2 and BRG1 were associated with each other and that the bromodomain region of BRG1 strongly suppressed transactivation by the amino-terminal region of Mi-2β. The findings that Mi-2β interacts with both transactivating and repressing proteins and directly associates with another chromatin remodeling protein, BRG1, provide new insight into the formation of multiprotein supercomplex involved in transcriptional regulation. Mi-2β is the main component of the nucleosome remodeling and deacetylase complex and plays an important role in epigenetic transcriptional repression. Here we show that the amino-terminal and carboxyl-terminal regions of Mi-2β have distinct transcriptional activities and bind to BRG1, a component of the SWI/SNF complex, and the RET finger protein (RFP), respectively. Analysis by luciferase reporter assay revealed that the amino-terminal region of Mi-2β has a strong transactivating ability, whereas its carboxyl-terminal region has transcriptional repressive activity. Co-localization and association of Mi-2, RFP, and histone deacetylase 1 suggested that these proteins cooperate in transcriptional repression. Furthermore, the functional importance of the association of Mi-2β and RFP was confirmed by using Rfp–/– fibroblasts. On the other hand, we demonstrated that Mi-2 and BRG1 were associated with each other and that the bromodomain region of BRG1 strongly suppressed transactivation by the amino-terminal region of Mi-2β. The findings that Mi-2β interacts with both transactivating and repressing proteins and directly associates with another chromatin remodeling protein, BRG1, provide new insight into the formation of multiprotein supercomplex involved in transcriptional regulation. Epigenetic control of gene expression contributes to the genome-wide mechanism of information storage and retrieval by changing chromatin structure (1Riddihough G. Pennisi E. Science. 2001; 293: 1063Crossref PubMed Scopus (32) Google Scholar). Emerging evidence suggests that dynamic changes in chromatin structure, including heterochromatin and euchromatin formation, modification of histone tails, ATP-dependent nucleosome remodeling activity, and binding of Polycomb and trithorax group proteins, play an important role in transcriptional regulation by changing the access to the underlying DNA (2Struhl K. Genes Dev. 1998; 12: 599-606Crossref PubMed Scopus (1552) Google Scholar, 3Jenuwein T. Allis C.D. Science. 2001; 293: 1074-1080Crossref PubMed Scopus (7666) Google Scholar, 4Simon J.A. Tamkun J.W. Curr. Opin. Genet. Dev. 2002; 12: 210-218Crossref PubMed Scopus (289) Google Scholar). Mi-2 is the main component of the nucleosome remodeling and deacetylase (NuRD) 1The abbreviations used are: NuRDnucleosome remodeling and deacetylaseHDAChistone deacetylaseRFPRET finger proteinDBDDNA-binding domain3-AT3-amino-1,2,4-triazoleSREserum response elementCREcyclic AMP response element. complex and is an autoantigen of dermatomyositis that is strongly associated with cancer (5Zhang Y. LeRoy G. Seelig H.P. Lane W.S. Reinberg D. Cell. 1998; 95: 279-289Abstract Full Text Full Text PDF PubMed Scopus (686) Google Scholar, 6Sigurgeirsson B. Lindelof B. Edhag O. Allander E. N. Engl. J. Med. 1992; 326: 363-367Crossref PubMed Scopus (683) Google Scholar). Mi-2 is involved in transcriptional repression, in cooperation with its associating proteins such as methyl CpG-binding protein MBD2/3, histone deacetylases HDAC1/2, MTA1/2/3, and RbAp46/48 (7Wade P.A. Gegonne A. Jones P.L. Ballestar E. Aubry F. Wolffe A.P. Nat. Genet. 1999; 23: 62-66Crossref PubMed Scopus (712) Google Scholar, 8Wade P.A. Jones P.L. Vermaak D. Wolffe A.P. Curr. Biol. 1998; 8: 843-846Abstract Full Text Full Text PDF PubMed Google Scholar, 9Xue Y. Wong J. Moreno G.T. Young M.K. Cote J. Wang W. Mol. Cell. 1998; 2: 85-861Abstract Full Text Full Text PDF PubMed Scopus (793) Google Scholar, 10Tong J.K. Hassig C.A. Schnitzler G.R. Kingston R.E. Schreiber S.L. Nature. 1998; 395: 917-921Crossref PubMed Scopus (547) Google Scholar). The NuRD complex associates with distinct types of transcriptional repressors. In particular, the carboxyl-terminal region of Mi-2 was identified as a binding site for several transcriptional repressors including hunchback, Trk69 (tram-track69), and KAP-1 co-repressor (11Schultz D.C. Friedman J.R. Rauscher III, F.J. Genes Dev. 2001; 15: 428-443Crossref PubMed Scopus (404) Google Scholar, 12Murawsky C.M. Brehm A. Badenhorst P. Lowe N. Becker P.B. Travers A.A. EMBO Rep. 2001; 2: 1089-1094Crossref PubMed Scopus (59) Google Scholar, 13Kehle J. Beuchle D. Treuheit S. Christen B. Kennison J.A. Bienz M. Muller J. Science. 1998; 282: 1897-1900Crossref PubMed Scopus (306) Google Scholar). In addition, recent work has shown that Mi-2 is a component of the cohesin complex that functions in sister chromatin segregation (14Hakimi M.A. Bochar D.A. Schmiesing J.A. Dong Y. Barak O.G. Speicher D.W. Yokomori K. Shiekhattar R. Nature. 2002; 418: 994-998Crossref PubMed Scopus (233) Google Scholar). nucleosome remodeling and deacetylase histone deacetylase RET finger protein DNA-binding domain 3-amino-1,2,4-triazole serum response element cyclic AMP response element. The RET finger protein (RFP) was originally identified as a protein that became oncogenic after fusing with the RET receptor tyrosine kinase (15Takahashi M. Inaguma Y. Hiai H. Hirose F. Mol. Cell. Biol. 1988; 8: 1853-1856Crossref PubMed Scopus (222) Google Scholar). RFP belongs to the RBCC-B30.2 protein family that contains a RING finger, a B-box zinc finger, a coiled-coil domain, and a specific carboxyl-terminal region known as the RFP domain or the B30.2-like domain (16Henry J. Mather I.H. McDermott M.F. Pontarotti P. Mol. Biol. Evol. 1998; 15: 1696-1705Crossref PubMed Scopus (108) Google Scholar). We reported previously (15Takahashi M. Inaguma Y. Hiai H. Hirose F. Mol. Cell. Biol. 1988; 8: 1853-1856Crossref PubMed Scopus (222) Google Scholar, 17Tezel G. Nagasaka T. Iwahashi N. Asai N. Iwashita T. Sakata K. Takahashi M. Pathol. Int. 1999; 49: 88-886Crossref PubMed Scopus (37) Google Scholar) that RFP mRNA was highly expressed in a variety of human and rodent tumor cell lines, as well as in male germ cells, and that its protein expression was detected in the nuclei of male germ cells, peripheral and central neurons, hepatocytes, and adrenal chromaffin cells. Moreover, our recent study provided evidence that RFP binds and colocalizes with EPC1 (Enhancer of Polycomb 1) in the nucleus and is involved in transcriptional repression (18Shimono Y. Murakami H. Hasegawa Y. Takahashi M. J. Biol. Chem. 2000; 275: 39411-39419Abstract Full Text Full Text PDF PubMed Scopus (85) Google Scholar, 19Tezel G. Shimono Y. Murakumo Y. Kawai K. Fukuda T. Iwahashi N. Takahashi M. Biochem. Biophys. Res. Commun. 2002; 290: 409-414Crossref PubMed Scopus (10) Google Scholar). The repressive activity of RFP resided mainly in its coiled-coil domain, which represents the binding site for EPC1. BRG1 is a central subunit of the SWI/SNF complex that participates in transcriptional activation (20Khavari P.A. Peterson C.L. Tamkun J.W. Mendel D.B. Crabtree G.R. Nature. 1993; 366: 170-174Crossref PubMed Scopus (536) Google Scholar, 21Kadam S. McAlpine G.S. Phelan M.L. Kingston R.E. Jones K.A. Emerson B.M. Genes Dev. 2000; 14: 2441-2451Crossref PubMed Scopus (191) Google Scholar). The SWI/SNF complex is recruited to promoters of specific genes, where it remodels nucleosomes to facilitate the binding of transcriptional activators. Interestingly, recent results show that the SWI/SNF complex also has transcriptional repressing activity in Drosophila and yeast (22Martens J.A. Winston F. Genes Dev. 2002; 16: 2231-2236Crossref PubMed Scopus (97) Google Scholar, 23Muchardt C. Yaniv M. Oncogene. 2001; 20: 3067-3075Crossref PubMed Scopus (172) Google Scholar) and that BRG1 interaction with HP1 (heterochromatin-associated protein 1) enhances transcriptional repression in mammalian cells (24Nielsen A.L. Sanchez C. Ichinose H. Cervino M. Lerouge T. Chambon P. Losson R. EMBO J. 2002; 21: 5797-5806Crossref PubMed Scopus (73) Google Scholar). In addition, BRG1 modulates the transcriptional activity of retinoblastoma, β-catenin, the estrogen receptor, and BRCA1 and is mutated or deleted in a variety of human tumor cell lines (23Muchardt C. Yaniv M. Oncogene. 2001; 20: 3067-3075Crossref PubMed Scopus (172) Google Scholar, 25Bochar D.A. Wang L. Beniya H. Kinev A. Xue Y. Lane W.S. Wang W. Kashanchi F. Shiekhattar R. Cell. 2000; 102: 257-265Abstract Full Text Full Text PDF PubMed Scopus (450) Google Scholar, 26Strobeck M.W. M.F. S. A. 2000; PubMed Scopus Google Scholar, J. Y. Phelan M. S. M. Kingston R. M. Mol. Cell. Biol. 2000; 20: PubMed Scopus Google Scholar, N. A. H. A. Bienz M. H. EMBO J. 2001; 20: PubMed Scopus Google Scholar). Mi-2 and BRG1 the main of the well known protein NuRD and of SWI/SNF and NuRD has reported in several multiprotein chromatin remodeling complex that is involved in in cells Mi-2, BRG1, and in a complex D.W. M. L. E. D. M. Seelig H.P. S. T. N. D. H. P. A. Mol. Biol. 2000; 20: PubMed Scopus Google Scholar). a group protein that is involved in was reported T. T. S. W. T. R. G. A. C.M. E. Mol. Cell. 2002; Full Text Full Text PDF PubMed Scopus Google Scholar) to the multiprotein supercomplex that both Mi-2 and that is highly to Here we provide evidence that Mi-2β has both transcriptional repressing and RFP directly binds the carboxyl-terminal region of and the transcriptional repressing activity of RFP is by Mi-2β in a In addition, the transcriptional repressing activity of Mi-2β was in Rfp–/– fibroblasts. On the other hand, the amino-terminal region of Mi-2β has a strong transcriptional and contains a binding site for that Mi-2 cooperate with both transactivating and repressing proteins distinct findings that the association of chromatin remodeling proteins such as Mi-2 and BRG1 formation of multiprotein involved in epigenetic of RFP the RING finger the coiled-coil or the RFP domain region were into the as previously (18Shimono Y. Murakami H. Hasegawa Y. Takahashi M. J. Biol. Chem. 2000; 275: 39411-39419Abstract Full Text Full Text PDF PubMed Scopus (85) Google Scholar). Mi-2β into the or was a F. Hirose region of Mi-2β was by using with an or site and with a The were into the and was into the or site of the (18Shimono Y. Murakami H. Hasegawa Y. Takahashi M. J. Biol. Chem. 2000; 275: 39411-39419Abstract Full Text Full Text PDF PubMed Scopus (85) Google Scholar) and into the or site of the Mi-2β was also into the site of the The carboxyl-terminal region of the BRG1 was by using the human as a and was BRG1 were by using with an site and with an site and were into the The were into the site of the BRG1 expression each BRG1 was into the site of the and RFP or the amino-terminal region of Mi-2β was into the and used as a to proteins by a yeast The RFP or Mi-2β was with a human into the of The were and with 3-amino-1,2,4-triazole were by and and by activity was by the assay to the DNA these were by and for gene using the the interaction RFP and Mi-2β in the yeast each RFP and Mi-2β domain by was into and and into were also by of the in the of as well as by expression of were using of luciferase reporter has previously (18Shimono Y. Murakami H. Hasegawa Y. Takahashi M. J. Biol. Chem. 2000; 275: 39411-39419Abstract Full Text Full Text PDF PubMed Scopus (85) Google Scholar). cells were in and with of luciferase reporter of and of RFP or Mi-2β by the to the the of expression of luciferase reporter of the and of the with of the were by the The cells were after and luciferase were as previously (18Shimono Y. Murakami H. Hasegawa Y. Takahashi M. J. Biol. Chem. 2000; 275: 39411-39419Abstract Full Text Full Text PDF PubMed Scopus (85) Google Scholar). with the was used to luciferase were expressed as and of the results and were previously (7Wade P.A. Gegonne A. Jones P.L. Ballestar E. Aubry F. Wolffe A.P. Nat. Genet. 1999; 23: 62-66Crossref PubMed Scopus (712) Google Scholar, Y. Murakami H. Hasegawa Y. Takahashi M. J. Biol. Chem. 2000; 275: 39411-39419Abstract Full Text Full Text PDF PubMed Scopus (85) Google Scholar). The was The and were cells were in and were with of expression using the of cells were with and in 1 of 1 The was and with of for the was in and 1 and for The were with specific or with of with protein or protein for in the were in and for were by and to with in the were with specific were and were using the and were as previously (18Shimono Y. Murakami H. Hasegawa Y. Takahashi M. J. Biol. Chem. 2000; 275: 39411-39419Abstract Full Text Full Text PDF PubMed Scopus (85) Google Scholar). of RFP and the was with using the The cells were with the by with a and with an of RFP and have shown previously (18Shimono Y. Murakami H. Hasegawa Y. Takahashi M. J. Biol. Chem. 2000; 275: 39411-39419Abstract Full Text Full Text PDF PubMed Scopus (85) Google Scholar) that RFP is involved in epigenetic gene and with EPC1. proteins, we yeast using RFP as of Mi-2β were a human Mi-2 is the main component of the NuRD complex, which is known to involved in gene Mi-2 has and that zinc finger a and an region The show a the RFP and of RFP and Mi-2β were into and respectively. that the RFP interacts with the carboxyl-terminal region of we the carboxyl-terminal of Mi-2β for RFP and Mi-2β were into the yeast and were both by and with and by activity. shown in a strong interaction was detected the RFP coiled-coil domain and the Mi-2β carboxyl-terminal and On the other hand, the the carboxyl-terminal region and in or binding activity, that the region is important and specific for RFP The carboxyl-terminal region of Mi-2 has reported to the binding site for several repressors such as hunchback, and KAP-1 (11Schultz D.C. Friedman J.R. Rauscher III, F.J. Genes Dev. 2001; 15: 428-443Crossref PubMed Scopus (404) Google Scholar, 12Murawsky C.M. Brehm A. Badenhorst P. Lowe N. Becker P.B. Travers A.A. EMBO Rep. 2001; 2: 1089-1094Crossref PubMed Scopus (59) Google Scholar, 13Kehle J. Beuchle D. Treuheit S. Christen B. Kennison J.A. Bienz M. Muller J. Science. 1998; 282: 1897-1900Crossref PubMed Scopus (306) Google and our results the that region binding for types of including and Co-localization of RFP, Mi-2, and the interaction RFP and Mi-2, were using human cells, in which the expression of both proteins was detected by (18Shimono Y. Murakami H. Hasegawa Y. Takahashi M. J. Biol. Chem. 2000; 275: 39411-39419Abstract Full Text Full Text PDF PubMed Scopus (85) Google Scholar). We also the association of RFP with that is known to a component of the NuRD the cell were with an both Mi-2 and were detected in the the association of these were were used for We were to the the of RFP that detected by the was the for the that was used for the We the of RFP, Mi-2, and by the of these proteins, human cells, in which the expression of these proteins was detected by were with an an and an The of these proteins were by the of and domain formation of revealed that RFP, Mi-2, and in these Analysis of of the carboxyl-terminal region of Mi-2 is the binding site for transcriptional repressors including RFP, a of Mi-2β to a was to the transcriptional activity of region in with other regions of Mi-2β luciferase reporter were each of the binding binding for transcriptional response element or cyclic AMP response element and a or kinase The transcriptional activities were by of each with luciferase reporter into cells. In the using the reporter the cells were with for we have shown previously (18Shimono Y. Murakami H. Hasegawa Y. Takahashi M. J. Biol. Chem. 2000; 275: 39411-39419Abstract Full Text Full Text PDF PubMed Scopus (85) Google RFP the luciferase activity by as with the control Mi-2β also the activity by We that the carboxyl-terminal that the RFP binding region has a transcriptional repressive to that of RFP, of the of the reporter used The region also repressive activity by whereas other regions and including the zinc finger region and the or repressive activity. the repressive activity of the carboxyl-terminal we of shown in the region and was for repressive activity. of RFP and Mi-2β in have in Y. and M. the cooperation of RFP and Mi-2β in transcriptional repression, a luciferase reporter assay was using a cell a shown in the transcriptional repressive activity of the Mi-2β was in Rfp–/– fibroblasts. carboxyl-terminal region which has a repressing activity in cells transcriptional in Rfp–/– fibroblasts. In the activity of of Mi-2β was in Rfp–/– is that of RFP the repressive activities of both Mi-2β and its carboxyl-terminal in Rfp–/– In addition, of Mi-2β the transcriptional repressive activity of RFP in cells results strongly that RFP plays a role in transcriptional repression. of the of Mi-2β and with to the repressive activity of the carboxyl-terminal region of we that the amino-terminal region in of Mi-2β has a strong transcriptional ability, in a of luciferase activity and in were used for the the transactivating that the region of is for binding of other proteins the transactivating of the amino-terminal region of yeast was using the amino-terminal region of Mi-2β as a human were identified as were identified that the carboxyl-terminal of BRG1 and in BRG1 is known to another chromatin remodeling protein and is a component of the SWI/SNF complex that transactivation (20Khavari P.A. Peterson C.L. Tamkun J.W. Mendel D.B. Crabtree G.R. Nature. 1993; 366: 170-174Crossref PubMed Scopus (536) Google Scholar, 21Kadam S. McAlpine G.S. Phelan M.L. Kingston R.E. Jones K.A. Emerson B.M. Genes Dev. 2000; 14: 2441-2451Crossref PubMed Scopus (191) Google Scholar). The association the carboxyl-terminal region of BRG1 and the amino-terminal region of Mi-2β was by a yeast a a association was detected the bromodomain of BRG1 in and whereas other and binding activity findings suggested that the transcriptional of the amino-terminal region of Mi-2β by association with the bromodomain region of the association of BRG1 with Mi-2β in we the using human cells. the expression regions of Mi-2β were into the cells, and the were with an by with an shown in BRG1 was with the amino-terminal region of association was detected with other regions of Mi-2β. the interaction of Mi-2 and BRG1 in the were shown in BRG1 was with Mi-2 using an and Mi-2 was with BRG1 using an findings that of the BRG1 and Mi-2 proteins with each other in it is that association is by a in the BRG1 and Mi-2 of BRG1 in the of we the of BRG1 the transactivating of the amino-terminal region of Mi-2β. expression were that of the BRG1 carboxyl-terminal were with the the Mi-2β amino-terminal transactivating region into cells to the luciferase reporter the transactivating of the amino-terminal region of Mi-2β was it was with the bromodomain region of BRG1 In other regions of BRG1 its transactivating ability, that binding of BRG1 bromodomain with the binding of BRG1, and have a the transactivating of the Mi-2β amino-terminal Mi-2 has chromatin remodeling activity and a protein complex involved in epigenetic transcriptional repression. J. A.P. Nat. Genet. 1999; 23: PubMed Scopus Google Scholar, A. K. H. P. Reinberg D. Genes Dev. 2002; 16: PubMed Scopus Google Scholar, J. C.M. M.L. A. B. Kingston R.E. J.A. Cell. 2002; Full Text Full Text PDF PubMed Scopus Google Scholar, B. R. D. A. Cell. 2002; Full Text Full Text PDF PubMed Scopus Google Scholar, R. Wang L. Wang H. L. H. P. Jones Y. Science. 2002; PubMed Scopus Google Scholar) the cooperation of Mi-2, Polycomb proteins, activity, and activity in transcriptional repression. In it was shown that human Polycomb group protein interacts with J. A.P. Nat. Genet. 1999; 23: PubMed Scopus Google Scholar) and that Drosophila functions in Polycomb group gene J. Beuchle D. Treuheit S. Christen B. Kennison J.A. Bienz M. Muller J. Science. 1998; 282: 1897-1900Crossref PubMed Scopus (306) Google Scholar). In addition, a of the protein associates with (11Schultz D.C. Friedman J.R. Rauscher III, F.J. Genes Dev. 2001; 15: 428-443Crossref PubMed Scopus (404) Google Scholar). RFP belongs to the RBCC-B30.2 protein proteins a RING finger, a B-box zinc finger, a coiled-coil domain, and a specific carboxyl-terminal region that was the RFP domain or the B30.2-like domain (15Takahashi M. Inaguma Y. Hiai H. Hirose F. Mol. Cell. Biol. 1988; 8: 1853-1856Crossref PubMed Scopus (222) Google Scholar). of the RING finger protein family have proteins known to play in and C.A. Cell. 2000; 102: Full Text Full Text PDF PubMed Scopus Google Scholar, Res. 2000; PubMed Scopus Google Scholar, J. Mol. Biol. 2000; PubMed Scopus Google Scholar). the RING finger and the to involved in for J. Mol. Biol. 2000; PubMed Scopus Google Scholar). In our (18Shimono Y. Murakami H. Hasegawa Y. Takahashi M. J. Biol. Chem. 2000; 275: 39411-39419Abstract Full Text Full Text PDF PubMed Scopus (85) Google we that RFP is a transcriptional and that its coiled-coil domain directly associates with a Polycomb group protein, that RFP in a protein complex by Polycomb group In the we show that Mi-2β was also identified as a protein that interacts with RFP and enhances transcriptional repression. The association of RFP and Mi-2β was confirmed using Rfp–/– fibroblasts. findings that Mi-2 is involved in gene that is by a variety of proteins, as well as by Polycomb group Mi-2 is an ATP-dependent nucleosome remodeling remodeling have identified in both transcriptional and repressing proteins, such as proteins and results that the region of Mi-2 has transcriptional activity, as by the assay using luciferase nucleosome remodeling is a of epigenetic transcriptional we that specific with these proteins the of the remodeling P.A. Wolffe A.P. Curr. Biol. 1999; Full Text Full Text PDF PubMed Scopus Google Scholar). Mi-2 a protein complex with and methyl CpG-binding protein in the transcriptional repressing NuRD protein complex (7Wade P.A. Gegonne A. Jones P.L. Ballestar E. Aubry F. Wolffe A.P. Nat. Genet. 1999; 23: 62-66Crossref PubMed Scopus (712) Google Scholar, 8Wade P.A. Jones P.L. Vermaak D. Wolffe A.P. Curr. Biol. 1998; 8: 843-846Abstract Full Text Full Text PDF PubMed Google Scholar, 10Tong J.K. Hassig C.A. Schnitzler G.R. Kingston R.E. Schreiber S.L. Nature. 1998; 395: 917-921Crossref PubMed Scopus (547) Google Scholar). Mi-2 also binds several types of transcriptional including hunchback, and KAP-1 Furthermore, its carboxyl-terminal region was identified as the binding site of repression (11Schultz D.C. Friedman J.R. Rauscher III, F.J. Genes Dev. 2001; 15: 428-443Crossref PubMed Scopus (404) Google Scholar, 12Murawsky C.M. Brehm A. Badenhorst P. Lowe N. Becker P.B. Travers A.A. EMBO Rep. 2001; 2: 1089-1094Crossref PubMed Scopus (59) Google Scholar, 13Kehle J. Beuchle D. Treuheit S. Christen B. Kennison J.A. Bienz M. Muller J. Science. 1998; 282: 1897-1900Crossref PubMed Scopus (306) Google Scholar). In we demonstrated that the Mi-2β carboxyl-terminal region interacts with the coiled-coil domain of the mechanism that repressive is we that cooperation repressors and is involved in the repressive activity of In addition, RFP, Mi-2, and were associated with each other and in the the that the of RFP also with the chromatin remodeling and histone deacetylase The transcriptional repressive activities of both Mi-2β and its carboxyl-terminal region were in the a the functional importance of the association of RFP with Mi-2 in cells. we that the amino-terminal region of Mi-2β has a strong transcriptional ability, in to the repressing activity of its carboxyl-terminal that BRG1, a component of another nucleosome remodeling SWI/SNF complex, binds to the Mi-2β amino-terminal and the bromodomain of BRG1 is for expression of the bromodomain the transactivating of the Mi-2β amino-terminal by with the binding of suggests that BRG1 is involved in the transactivating activity of The NuRD complex is associated with transcriptional gene recent that a subunit of the NuRD complex, is to the promoters of Drosophila A. B.M. Nature. 2001; Scopus Google and histone to J. Allis C.D. Science. 2001; PubMed Scopus Google Scholar). findings that transcriptional repressing associated with BRG1 is of the SWI/SNF protein complex that is involved in transcriptional activation P. Oncogene. 2001; 20: PubMed Scopus Google Scholar). BRG1 enhances the activity of the and N. A. H. A. Bienz M. H. EMBO J. 2001; 20: PubMed Scopus Google Scholar) and is for the activation of M.W. J. Biol. Chem. 2002; Full Text Full Text PDF PubMed Scopus Google Scholar). recent (22Martens J.A. Winston F. Genes Dev. 2002; 16: 2231-2236Crossref PubMed Scopus (97) Google Scholar, 23Muchardt C. Yaniv M. Oncogene. 2001; 20: 3067-3075Crossref PubMed Scopus (172) Google Scholar) that BRG1 also as a transcriptional in including and the interaction of BRG1 with HP1 the heterochromatin structure and transcriptional repression (24Nielsen A.L. Sanchez C. Ichinose H. Cervino M. Lerouge T. Chambon P. Losson R. EMBO J. 2002; 21: 5797-5806Crossref PubMed Scopus (73) Google Scholar). In addition, BRG1 was associated with and was involved in transcriptional repression, in the repression of genes, by the S. Kingston R.E. Genes Dev. 2001; 15: PubMed Scopus Google Scholar, E. D.W. G. J. Biol. Chem. 2002; Full Text Full Text PDF PubMed Scopus Google that the of BRG1 is to BRG1 and Mi-2 the main of SWI/SNF and which well known chromatin remodeling BRG1 and Mi-2 also of other multiprotein in the of transcriptional in In it is that the chromatin remodeling complex contains of both the SWI/SNF and NuRD in a complex that Mi-2 and has that complex plays a role in to in cells D.W. M. L. E. D. M. Seelig H.P. S. T. N. D. H. P. A. Mol. Biol. 2000; 20: PubMed Scopus Google Scholar). In addition, a of the human group protein family and a mammalian of Drosophila the multiprotein supercomplex of the of and and complex binds the region of the Mi-2 and which is highly to were to involved in the multiprotein supercomplex T. T. S. W. T. R. G. A. C.M. E. Mol. Cell. 2002; Full Text Full Text PDF PubMed Scopus Google Scholar). We that association of chromatin remodeling proteins plays a role in the formation of multiprotein that of distinct protein such as SWI/SNF and In we have identified transcriptional and repressing regions in the chromatin remodeling protein Mi-2β. regions were associated with proteins, BRG1 and RFP, and distinct transcriptional findings provide new insight into the cooperation of transactivating and repressing protein and the formation of multiprotein that involved in transcriptional regulation. We K. K. and M. for
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