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• W2065997260 abstract "A 163 bp enhancer in the CYP2B2 5′ flank confers PB (phenobarbital) inducibility and constitutes a PBRU (PB response unit). The PBRU contains several transcription factor binding sites, including NR1, NR2 and NR3, which are direct repeats separated by 4 bp of the nuclear receptor consensus half-site AGGTCA, as well as an ER (everted repeat) separated by 7 bp (ER-7). Constitutive androstane receptor (CAR)–RXR (retinoic X receptor) heterodimers are known to bind to NR1, NR2 and NR3. Electrophoretic mobility-shift analysis using nuclear extracts from livers of untreated or PB-treated rats revealed binding of several other proteins to different PBRU elements. Using supershift analysis and in vitro coupled transcription and translation, the proteins present in four retarded complexes were identified as TRβ (thyroid hormone receptor β), LXR (liver X receptor), HNF-4 (hepatocyte nuclear factor 4) and heterodimers of PBX–PREP1 (pre-B cell homoeobox–Pbx regulatory protein 1). LXR–RXR heterodimers bound to NR3 and TRβ bound to NR3, NR1 and ER-7, whereas the PBX–PREP1 site is contained within NR2. The HNF-4 site overlaps with NR1. A mutation described previously, GRE1m1, which decreases PB responsiveness, increased the affinity of this site for HNF-4. The PBRU also contains a site for nuclear factor 1. The PBRU thus contains a plethora of transcription factor binding sites. The profiles of transcription factor binding to NR1 and NR3 were quite similar, although strikingly different from, and more complex than, that of NR2. This parallels the functional differences in conferring PB responsiveness between NR1 and NR3 on the one hand, and NR2 on the other." @default.
• W2065997260 created "2016-06-24" @default.
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• W2065997260 date "2005-05-24" @default.
• W2065997260 modified "2023-10-16" @default.
• W2065997260 title "The CYP2B2 phenobarbital response unit contains binding sites for hepatocyte nuclear factor 4, PBX–PREP1, the thyroid hormone receptor β and the liver X receptor" @default.
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• W2065997260 doi "https://doi.org/10.1042/bj20041556" @default.
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