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• W2018242703 abstract "Rainbow trout aryl hydrocarbon receptor (AHR) nuclear translocator isoform a (rtARNTa) has a negative function in AHR-mediated signal transduction. Previous analyses suggest that the negative function is at the level of DNA binding and may be due to the presence of 57 C-terminal amino acids that are strongly hydrophobic. To assess the negative activity of rtARNTa at the molecular level, hydrophobic-rich domains corresponding to amino acids 601-637, 601-631, and 616-631 were analyzed for the ability to affect the function of truncated rtARNT proteins in complementation and gel shift assays. Addition of the hydrophobic-rich domains to these proteins reduced their ability to complement AHR-mediated signal transduction in mouse hepatoma cells by 65-95%. The decrease in function was related to a reduced ability of the AHR. rtARNT complex to bind DNA and not due to a lack of dimerization with AHR. Expression of the hydrophobic-rich domains on Gal4 proteins showed that the C-terminal domain of rtARNTa was unlikely to contain transactivation function; however, the hydrophobic domains reduced the ability of the Gal4 proteins to bind DNA. Immunoprecipitation and mutational experiments indicate that the hydrophobic-rich domains do not interact with the bHLH motif of AHR. Interestingly, immunoprecipitation experiments also revealed that the C-terminal hydrophobic-rich region of rtARNTa could oligomerize in vitro in a chimera with the Gal4 DNA binding domain. These findings indicate that the C-terminal hydrophobic amino acids are critical for the negative function of rtARNTa in AHR-mediated signaling and suggest that multiple mechanisms may be involved in the repression of DNA binding." @default.
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• W2018242703 title "Identification of a novel C-terminal domain involved in the negative function of the rainbow trout Ah receptor nuclear translocator protein isoform a (rtARNTa) in Ah receptor-mediated signaling11Abbreviations: ARNT, aryl hydrocarbon receptor nuclear translocator; rtARNT, rainbow trout ARNT; mARNT, mouse ARNT; bHLH, basic helix-loop-helix; PAS, PER-ARNT-SIM; AHR, aryl hydrocarbon receptor; TCDD, 2,3,7,8-tetrachlorodibenzo-p-dioxin; HIF, hypoxia-inducible factor; GAR-HRP, goat anti-rabbit …" @default.
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• W2018242703 doi "https://doi.org/10.1016/s0006-2952(01)00671-2" @default.
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