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BRCA1 transcriptional activity is enhanced by interactions between its AD1 domain and AhR

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Affiliated Author(s)
조치흠
Alternative Author(s)
Cho, Chi Heum
Journal Title
Cancer Chemotherapy and Pharmacology
ISSN
0344-5704
Issued Date
2008
Abstract
Purpose : We previously reported that BRCA1 interacts with aryl hydrocarbon receptor nuclear translocator (ARNT) and that this interaction affects TCDD-induced CYP1A1 gene expression (Kang et al., J Biol Chem 281:14654–14662, 2006). In this study we continue this investigation and begin to define the significance of this interaction for the regulation of stress-induced transcription.
Methods : Immunoprecipitations (IPs), western blot (WB) analysis, GST pull-down assays and promoter reporter assays were used to investigate whether the aryl hydrocarbon receptor (AhR) can regulate transcription that is dependent on the activation domain 1 (AD1) domain of BRCA1.
Results : We show that AhR, a transcription factor, can bind specifically to AD1 in the C-terminal region of BRCA1 and affect BRCA1’s ability to regulate transcription activity. We found that xenobiotics that positively and negatively affect AhR’s activity as a transcription factor (e.g., dioxin and α-naphthoflavone, respectively), have similar effects on AhR’s ability to affect AD1-domain-dependent transcription. These physical and functional AhR–AD1 interactions may require the coiled-coil motif in AD1 because point-mutations in this motif reduce these interactions.
Conclusion : Xenobiotic-activated AhR can function in two ways, as a component of the AhR/ARNT transcription factor and a regulator of AD1-dependent transcription. Consequently, BRCA1 has two distinct mechanisms for sensing xenobiotics and regulating AhR-dependent stress responses to these xenobiotics. We speculate that the normal functioning of this interaction could play a role in BRCA1’s tumor suppressing ability.
Keywords : BRCA1 – AD1 – AhR – JunB – Xenobiotic stress – Transcription regulation
Department
Dept. of Obstetrics & Gynecology (산부인과학)
Publisher
School of Medicine
Citation
Hyo Jin Kang et al. (2008). BRCA1 transcriptional activity is enhanced by interactions between its AD1 domain and AhR. Cancer Chemotherapy and Pharmacology, 62(6), 965–975. doi: 10.1007/s00280-008-0686-x
Type
Article
ISSN
0344-5704
DOI
10.1007/s00280-008-0686-x
URI
https://kumel.medlib.dsmc.or.kr/handle/2015.oak/35295
Appears in Collections:
1. School of Medicine (의과대학) > Dept. of Obstetrics & Gynecology (산부인과학)
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