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Human B1 binding factor (hB1F) is a novel transcription factor cloned in our laboratory, which has the capacity of binding the Bl region of HBV enhancer Ⅱ (EN Ⅱ) and stimulating its activity. In this report, the functional relationship between hBlF and other liver-enriched activators of EN Ⅱ was investigated. The results of CAT assay indicated that there was only additive effect between hB1F and HNF4 as well as HNF3β. On the contrary, the presence of both hBlF and HNF1 would result in significant functional synergism. Further GST pull down assay indicated that hBlF could interact with HNFl directly in vitro. This study provides the evidence that hB1F and HNF1 work syn-ergistically in the regulation of the activity of HBV EN Ⅱ.
Human b binding factor (hB1F) is a novel transcription factor cloned in our laboratory, which has the capacity of binding of the Bl region of HBV enhancer II (EN II) and stimulating its activity. In this report, the functional relationship between hBlF and other The results of CAT assay showed that there was only additive effect between hB1F and HNF4 as well as HNF3β. On the contrary, the presence of both hBF and HNF1 would result in significant functional synergism. Further GST pull down assay indicated that hBlF could interact with HNFl directly in vitro. This study provides the evidence that hB1F and HNF1 work syn-ergistically in the regulation of the activity of HBV EN II.