The nuclear receptor co-repressor 2 (NCOR2) is a transcriptional coregulatory protein that contains several nuclear receptor-interacting domains. In addition, NCOR2 appears to recruit histone deacetylases to DNA promoter regions. Hence NCOR2 assists nuclear receptors in the down regulation of target gene expression.[1][2] NCOR2 is also referred to as a silencing mediator for retinoid or thyroid-hormone receptors (SMRT)[1] or T3 receptor-associating cofactor 1 (TRAC-1).[2]
NCOR2/SMRT is a transcriptional coregulatory protein that contains several modulatory functional domains including multiple autonomous repression domains as well as two or three C-terminal nuclear receptor-interacting domains.[1] NCOR2/SMRT serves as a repressive coregulatory factor (corepressor) for multiple transcription factor pathways. In this regard, NCOR2/SMRT functions as a platform protein, facilitating the recruitment of histone deacetylases to the DNA promoters bound by its interacting transcription factors.[3]
Family
It is a member of the family of nuclear receptor corepressors; the other human protein that is a member of that family is Nuclear receptor co-repressor 1.[4]
Discovery
SMRT was initially cloned and characterized in the laboratory of Dr. Ronald M. Evans at the Salk Institute for Biological Studies.[1] In another early investigation into this molecule, similar findings were reported in a variant referred to as TRAC-1.[2]
Interactions
Nuclear receptor co-repressor 2 has been shown to interact with:
↑ 1.01.11.21.3Chen JD, Evans RM (October 1995). "A transcriptional co-repressor that interacts with nuclear hormone receptors". Nature. 377 (6548): 454–7. doi:10.1038/377454a0. PMID7566127.
↑ 2.02.12.2Sande S, Privalsky ML (July 1996). "Identification of TRACs (T3 receptor-associating cofactors), a family of cofactors that associate with, and modulate the activity of, nuclear hormone receptors". Molecular Endocrinology. 10 (7): 813–25. doi:10.1210/me.10.7.813. PMID8813722.
↑Nagy L, Kao HY, Chakravarti D, Lin RJ, Hassig CA, Ayer DE, Schreiber SL, Evans RM (May 1997). "Nuclear receptor repression mediated by a complex containing SMRT, mSin3A, and histone deacetylase". Cell. 89 (3): 373–80. doi:10.1016/S0092-8674(00)80218-4. PMID9150137.
↑Liao G, Chen LY, Zhang A, Godavarthy A, Xia F, Ghosh JC, Li H, Chen JD (February 2003). "Regulation of androgen receptor activity by the nuclear receptor corepressor SMRT". The Journal of Biological Chemistry. 278 (7): 5052–61. doi:10.1074/jbc.M206374200. PMID12441355.
↑Song LN, Coghlan M, Gelmann EP (January 2004). "Antiandrogen effects of mifepristone on coactivator and corepressor interactions with the androgen receptor". Molecular Endocrinology. 18 (1): 70–85. doi:10.1210/me.2003-0189. PMID14593076.
↑Dotzlaw H, Moehren U, Mink S, Cato AC, Iñiguez Lluhí JA, Baniahmad A (April 2002). "The amino terminus of the human AR is target for corepressor action and antihormone agonism". Molecular Endocrinology. 16 (4): 661–73. doi:10.1210/me.16.4.661. PMID11923464.
↑ 8.08.1Wong CW, Privalsky ML (October 1998). "Components of the SMRT corepressor complex exhibit distinctive interactions with the POZ domain oncoproteins PLZF, PLZF-RARalpha, and BCL-6". The Journal of Biological Chemistry. 273 (42): 27695–702. doi:10.1074/jbc.273.42.27695. PMID9765306.
↑ 11.011.111.211.3Lee SK, Kim JH, Lee YC, Cheong J, Lee JW (April 2000). "Silencing mediator of retinoic acid and thyroid hormone receptors, as a novel transcriptional corepressor molecule of activating protein-1, nuclear factor-kappaB, and serum response factor". The Journal of Biological Chemistry. 275 (17): 12470–4. doi:10.1074/jbc.275.17.12470. PMID10777532.
↑ 12.012.1Fischer DD, Cai R, Bhatia U, Asselbergs FA, Song C, Terry R, Trogani N, Widmer R, Atadja P, Cohen D (February 2002). "Isolation and characterization of a novel class II histone deacetylase, HDAC10". The Journal of Biological Chemistry. 277 (8): 6656–66. doi:10.1074/jbc.M108055200. PMID11739383.
↑ 13.013.1Underhill C, Qutob MS, Yee SP, Torchia J (December 2000). "A novel nuclear receptor corepressor complex, N-CoR, contains components of the mammalian SWI/SNF complex and the corepressor KAP-1". The Journal of Biological Chemistry. 275 (51): 40463–70. doi:10.1074/jbc.M007864200. PMID11013263.
↑Sohn YC, Kwak E, Na Y, Lee JW, Lee SK (November 2001). "Silencing mediator of retinoid and thyroid hormone receptors and activating signal cointegrator-2 as transcriptional coregulators of the orphan nuclear receptor Nur77". The Journal of Biological Chemistry. 276 (47): 43734–9. doi:10.1074/jbc.M107208200. PMID11559707.
↑Kakizawa T, Miyamoto T, Ichikawa K, Takeda T, Suzuki S, Mori J, Kumagai M, Yamashita K, Hashizume K (March 2001). "Silencing mediator for retinoid and thyroid hormone receptors interacts with octamer transcription factor-1 and acts as a transcriptional repressor". The Journal of Biological Chemistry. 276 (13): 9720–5. doi:10.1074/jbc.M008531200. PMID11134019.
↑Beatus P, Lundkvist J, Oberg C, Pedersen K, Lendahl U (June 2001). "The origin of the ankyrin repeat region in Notch intracellular domains is critical for regulation of HES promoter activity". Mechanisms of Development. 104 (1–2): 3–20. doi:10.1016/S0925-4773(01)00373-2. PMID11404076.
↑ 31.031.1Takahashi S, McConnell MJ, Harigae H, Kaku M, Sasaki T, Melnick AM, Licht JD (June 2004). "The Flt3 internal tandem duplication mutant inhibits the function of transcriptional repressors by blocking interactions with SMRT". Blood. 103 (12): 4650–8. doi:10.1182/blood-2003-08-2759. PMID14982881.
↑Liu Y, Takeshita A, Misiti S, Chin WW, Yen PM (October 1998). "Lack of coactivator interaction can be a mechanism for dominant negative activity by mutant thyroid hormone receptors". Endocrinology. 139 (10): 4197–204. doi:10.1210/endo.139.10.6218. PMID9751500.
↑ 39.039.1Tagami T, Lutz WH, Kumar R, Jameson JL (December 1998). "The interaction of the vitamin D receptor with nuclear receptor corepressors and coactivators". Biochemical and Biophysical Research Communications. 253 (2): 358–63. doi:10.1006/bbrc.1998.9799. PMID9878542.
↑Ando S, Sarlis NJ, Krishnan J, Feng X, Refetoff S, Zhang MQ, Oldfield EH, Yen PM (September 2001). "Aberrant alternative splicing of thyroid hormone receptor in a TSH-secreting pituitary tumor is a mechanism for hormone resistance". Molecular Endocrinology. 15 (9): 1529–38. doi:10.1210/me.15.9.1529. PMID11518802.
↑Puccetti E, Obradovic D, Beissert T, Bianchini A, Washburn B, Chiaradonna F, Boehrer S, Hoelzer D, Ottmann OG, Pelicci PG, Nervi C, Ruthardt M (December 2002). "AML-associated translocation products block vitamin D(3)-induced differentiation by sequestering the vitamin D(3) receptor". Cancer Research. 62 (23): 7050–8. PMID12460926.
Further reading
Hörlein AJ, Näär AM, Heinzel T, Torchia J, Gloss B, Kurokawa R, Ryan A, Kamei Y, Söderström M, Glass CK (October 1995). "Ligand-independent repression by the thyroid hormone receptor mediated by a nuclear receptor co-repressor". Nature. 377 (6548): 397–404. doi:10.1038/377397a0. PMID7566114.
Chen JD, Evans RM (October 1995). "A transcriptional co-repressor that interacts with nuclear hormone receptors". Nature. 377 (6548): 454–7. doi:10.1038/377454a0. PMID7566127.
Sande S, Privalsky ML (July 1996). "Identification of TRACs (T3 receptor-associating cofactors), a family of cofactors that associate with, and modulate the activity of, nuclear hormone receptors". Molecular Endocrinology. 10 (7): 813–25. doi:10.1210/me.10.7.813. PMID8813722.
Bonaldo MF, Lennon G, Soares MB (September 1996). "Normalization and subtraction: two approaches to facilitate gene discovery". Genome Research. 6 (9): 791–806. doi:10.1101/gr.6.9.791. PMID8889548.
Margolis RL, Abraham MR, Gatchell SB, Li SH, Kidwai AS, Breschel TS, Stine OC, Callahan C, McInnis MG, Ross CA (July 1997). "cDNAs with long CAG trinucleotide repeats from human brain". Human Genetics. 100 (1): 114–22. doi:10.1007/s004390050476. PMID9225980.
Chen H, Lin RJ, Schiltz RL, Chakravarti D, Nash A, Nagy L, Privalsky ML, Nakatani Y, Evans RM (August 1997). "Nuclear receptor coactivator ACTR is a novel histone acetyltransferase and forms a multimeric activation complex with P/CAF and CBP/p300". Cell. 90 (3): 569–80. doi:10.1016/S0092-8674(00)80516-4. PMID9267036.
Lin RJ, Nagy L, Inoue S, Shao W, Miller WH, Evans RM (February 1998). "Role of the histone deacetylase complex in acute promyelocytic leukaemia". Nature. 391 (6669): 811–4. doi:10.1038/35895. PMID9486654.
Laherty CD, Billin AN, Lavinsky RM, Yochum GS, Bush AC, Sun JM, Mullen TM, Davie JR, Rose DW, Glass CK, Rosenfeld MG, Ayer DE, Eisenman RN (July 1998). "SAP30, a component of the mSin3 corepressor complex involved in N-CoR-mediated repression by specific transcription factors". Molecular Cell. 2 (1): 33–42. doi:10.1016/S1097-2765(00)80111-2. PMID9702189.
Liu Y, Takeshita A, Misiti S, Chin WW, Yen PM (October 1998). "Lack of coactivator interaction can be a mechanism for dominant negative activity by mutant thyroid hormone receptors". Endocrinology. 139 (10): 4197–204. doi:10.1210/endo.139.10.6218. PMID9751500.
Wong CW, Privalsky ML (October 1998). "Components of the SMRT corepressor complex exhibit distinctive interactions with the POZ domain oncoproteins PLZF, PLZF-RARalpha, and BCL-6". The Journal of Biological Chemistry. 273 (42): 27695–702. doi:10.1074/jbc.273.42.27695. PMID9765306.
Nguyen TA, Hoivik D, Lee JE, Safe S (July 1999). "Interactions of nuclear receptor coactivator/corepressor proteins with the aryl hydrocarbon receptor complex". Archives of Biochemistry and Biophysics. 367 (2): 250–7. doi:10.1006/abbi.1999.1282. PMID10395741.
Bailey P, Downes M, Lau P, Harris J, Chen SL, Hamamori Y, Sartorelli V, Muscat GE (July 1999). "The nuclear receptor corepressor N-CoR regulates differentiation: N-CoR directly interacts with MyoD". Molecular Endocrinology. 13 (7): 1155–68. doi:10.1210/me.13.7.1155. PMID10406466.
Lee SK, Kim JH, Lee YC, Cheong J, Lee JW (April 2000). "Silencing mediator of retinoic acid and thyroid hormone receptors, as a novel transcriptional corepressor molecule of activating protein-1, nuclear factor-kappaB, and serum response factor". The Journal of Biological Chemistry. 275 (17): 12470–4. doi:10.1074/jbc.275.17.12470. PMID10777532.