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• W1771272020 abstract "Enhancer II of human hepatitis B virus has dual functions in vivo. Located at nucleotides (nt) 1646 to 1741, it can stimulate the surface and X promoters from a downstream position. Moreover, the same sequence can also function as upstream regulatory element that activates the core promoter in a position- and orientation-dependent manner. In this study, we report the identification and characterization of a negative regulatory element (NRE) upstream of enhancer II (nt 1613 to 1636) which can repress both the enhancer and upstream stimulatory function of the enhancer II sequence in differentiated liver cells. This NRE has marginal inhibitory effect by itself but a strong repressive function in the presence of a functional enhancer II. Mutational analysis reveals that sequence from nt 1616 to 1621 is required for repression of enhancer activity by the NRE. Gel shift analysis reveals that this negative regulatory region can be recognized by a specific protein factor(s) present at the 0.4 M NaCl fraction of HepG2 nuclear extracts. The discovery of the NRE indicates that HBV gene transcription is controlled by combined effects of both positive and negative regulation. It also provides a unique system with which to study the mechanism of negative regulation of gene expression." @default.
• W1771272020 created "2016-06-24" @default.
• W1771272020 creator A5069572293 @default.
• W1771272020 creator A5076225584 @default.
• W1771272020 date "1994-03-01" @default.
• W1771272020 modified "2023-10-18" @default.
• W1771272020 title "Repression of enhancer II activity by a negative regulatory element in the hepatitis B virus genome" @default.
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• W1771272020 doi "https://doi.org/10.1128/jvi.68.3.1758-1764.1994" @default.
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