NCOA3
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesNCOA3, ACTR, AIB-1, AIB1, CAGH16, CTG26, KAT13B, RAC3, SRC-3, SRC3, TNRC14, TNRC16, TRAM-1, bHLHe42, pCIP, nuclear receptor coactivator 3
External IDsOMIM: 601937 MGI: 1276535 HomoloGene: 4764 GeneCards: NCOA3
Orthologs
SpeciesHumanMouse
Entrez

8202

17979

Ensembl

ENSG00000124151

ENSMUSG00000027678

UniProt

Q9Y6Q9

O09000

RefSeq (mRNA)

NM_181659
NM_001174087
NM_001174088
NM_006534

NM_008679
NM_001374779

RefSeq (protein)

NP_001167558
NP_001167559
NP_006525
NP_858045

n/a

Location (UCSC)Chr 20: 47.5 – 47.66 MbChr 2: 165.99 – 166.07 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

The nuclear receptor coactivator 3 also known as NCOA3 is a protein that, in humans, is encoded by the NCOA3 gene.[5][6] NCOA3 is also frequently called 'amplified in breast 1' (AIB1), steroid receptor coactivator-3 (SRC-3), or thyroid hormone receptor activator molecule 1 (TRAM-1).

Function

NCOA3 is a transcriptional coactivator protein that contains several nuclear receptor interacting domains and an intrinsic histone acetyltransferase activity. NCOA3 is recruited to DNA promotion sites by ligand-activated nuclear receptors. NCOA3, in turn, acylates histones, which makes downstream DNA more accessible to transcription. Hence, NCOA3 assists nuclear receptors in the upregulation of gene expression.[7][8]

Clinical significance

The ratio of PAX2 to AIB-1 protein expression may be predictive of the effectiveness of tamoxifen in breast cancer treatment.[9][10]

Several molecular mechanisms implicate NCOA3 (AIB1) in the endocrine therapy resistance (depicted in the figure). Signaling pathways or mutations (i.e. HER2/neu overexpression, activating mutations in PIK3CA (PI3K), activating mutations in the proto-oncogene tyrosine-protein kinase Src, etc.) that lead to persistent activation of ERK and/or PIK3CA/AKT kinase pathways result, in one hand in an enhanced AIB1 transcriptional coactivation capacity,[11] and in the other hand in the inhibition of the proteasome-dependent AIB1 turn-over and therefore, in AIB1 overexpression.[12] In both conditions, the equilibrium of estrogen receptor (ER) complex formation is displaced towards a transcriptionally active complex and thus, counteracting the inhibition caused by anti-estrogenic drugs such as tamoxifen or fulvestrant (selective estrogen receptor modulators). The result is the restoration of estrogen-sensitive gene transcription and the promotion of cancer progression and/or relapse.

Notably, tumors diagnosed with concomitant overexpression of AIB1 and HER2/neu have worse outcome with tamoxifen therapy than all other patients combined.[13] In addition, dormant tumor cells of luminal breast cancers treated with endocrine therapy may acquire with time, mutations that alter kinase signalling pathways and ultimately enhance AIB1 oncogenic functions. Also, estrogen receptor-PAX2 complexes repress HER2/neu expression, but loss of PAX2 expression may result in de novo HER2/neu expression and initiate endocrine therapy resistance and relapse.[14]

Mechanisms for AIB1-dependent anti-estrogen therapy resistance

Interactions

Nuclear receptor coactivator 3 has been shown to interact with:

References

  1. 1 2 3 GRCh38: Ensembl release 89: ENSG00000124151 - Ensembl, May 2017
  2. 1 2 3 GRCm38: Ensembl release 89: ENSMUSG00000027678 - Ensembl, May 2017
  3. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. Anzick SL, Kononen J, Walker RL, Azorsa DO, Tanner MM, Guan XY, Sauter G, Kallioniemi OP, Trent JM, Meltzer PS (August 1997). "AIB1, a steroid receptor coactivator amplified in breast and ovarian cancer". Science. 277 (5328): 965–8. doi:10.1126/science.277.5328.965. PMID 9252329.
  6. Takeshita A, Cardona GR, Koibuchi N, Suen CS, Chin WW (October 1997). "TRAM-1, A novel 160-kDa thyroid hormone receptor activator molecule, exhibits distinct properties from steroid receptor coactivator-1". J. Biol. Chem. 272 (44): 27629–34. doi:10.1074/jbc.272.44.27629. PMID 9346901.
  7. Anzick SL, Kononen J, Walker RL, Azorsa DO, Tanner MM, Guan XY, Sauter G, Kallioniemi OP, Trent JM, Meltzer PS (1997). "AIB1, a steroid receptor coactivator amplified in breast and ovarian cancer". Science. 277 (5328): 965–8. doi:10.1126/science.277.5328.965. PMID 9252329.
  8. Takeshita A, Cardona GR, Koibuchi N, Suen CS, Chin WW (1997). "TRAM-1, A novel 160-kDa thyroid hormone receptor activator molecule, exhibits distinct properties from steroid receptor coactivator-1". J Biol Chem. 272 (44): 27629–34. doi:10.1074/jbc.272.44.27629. PMID 9346901.
  9. "Study sheds new light on tamoxifen resistance". Cordis News. Cordis. 2008-11-13. Archived from the original on 2009-02-20. Retrieved 2008-11-14.
  10. Hurtado A, Holmes KA, Geistlinger TR, Hutcheson IR, Nicholson RI, Brown M, et al. (December 2008). "Regulation of ERBB2 by oestrogen receptor-PAX2 determines response to tamoxifen". Nature. 456 (7222): 663–6. Bibcode:2008Natur.456..663H. doi:10.1038/nature07483. PMC 2920208. PMID 19005469.
  11. Font de Mora J, Brown M (July 2000). "AIB1 is a conduit for kinase-mediated growth factor signaling to the estrogen receptor". Molecular and Cellular Biology. 20 (14): 5041–7. doi:10.1128/MCB.20.14.5041-5047.2000. PMC 85954. PMID 10866661.
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  18. 1 2 3 4 Wu RC, Qin J, Hashimoto Y, Wong J, Xu J, Tsai SY, Tsai MJ, O'Malley BW (May 2002). "Regulation of SRC-3 (pCIP/ACTR/AIB-1/RAC-3/TRAM-1) Coactivator activity by I kappa B kinase". Mol. Cell. Biol. 22 (10): 3549–61. doi:10.1128/MCB.22.10.3549-3561.2002. PMC 133790. PMID 11971985.
  19. Naltner A, Wert S, Whitsett JA, Yan C (December 2000). "Temporal/spatial expression of nuclear receptor coactivators in the mouse lung". Am. J. Physiol. Lung Cell Mol. Physiol. 279 (6): L1066-74. doi:10.1152/ajplung.2000.279.6.l1066. PMID 11076796. S2CID 27872061.
  20. 1 2 3 Watanabe M, Yanagisawa J, Kitagawa H, Takeyama K, Ogawa S, Arao Y, Suzawa M, Kobayashi Y, Yano T, Yoshikawa H, Masuhiro Y, Kato S (March 2001). "A subfamily of RNA-binding DEAD-box proteins acts as an estrogen receptor alpha coactivator through the N-terminal activation domain (AF-1) with an RNA coactivator, SRA". EMBO J. 20 (6): 1341–52. doi:10.1093/emboj/20.6.1341. PMC 145523. PMID 11250900.
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  26. Kodera Y, Takeyama K, Murayama A, Suzawa M, Masuhiro Y, Kato S (October 2000). "Ligand type-specific interactions of peroxisome proliferator-activated receptor gamma with transcriptional coactivators". J. Biol. Chem. 275 (43): 33201–4. doi:10.1074/jbc.C000517200. PMID 10944516.
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Further reading

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