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- W2034406697 abstract "Hepatocyte Nuclear Factor 4 (HNF-4), a liver-enriched orphan receptor of the nuclear receptor superfamily, is required for the expression of a wide variety of liver-specific genes including apoAI. To explore the possibility that site A of the apoAI gene enhancer might also be the target for HNF-4 without the interference of endogenous mammalian cell proteins that also bind to site A, we tested the ability of HNF-4 to activate transcription from site A in yeast cells. Electrophoretic mobility shift assays (EMSA) and Scatchard plot analysis demonstrated that yeast produced HNF-4 binds to site A with an affinity two times higher than that of yeast produced RXR alpha. Mapping analysis indicated that the 5' portion of site A containing two imperfect direct repeats (TGAACCCTTGACC) and the sequence of the trinucleotide spacer (CCT) between these imperfect repeats are critical determinants for selective binding and transactivation by HNF-4. Similar observations were obtained when these mutated versions of site A were evaluated by transient cotransfection assays in CV1 cells. We conclude that the unique structural determinants of site A in conjunction with the differential binding affinity of HNF-4 for site A may play a fundamental role in apoAI gene regulation." @default.
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- W2034406697 title "Transcriptional regulation of the apoAl gene by hepatic nuclear factor 4 in yeast" @default.
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- W2034406697 doi "https://doi.org/10.1093/nar/22.25.5665" @default.
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