A new compound from Micromonospora sp. SA246, 9-hydroxycrisamicin-A, activates hepatitis B virus replication
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- A new compound from Micromonospora sp. SA246, 9-hydroxycrisamicin-A, activates hepatitis B virus replication
- Seok Won Yoon; In Young Park; Bo Hwa Sohn; Jae Hyouk Lee; W H Yeo; Young Ik Lee
- Bibliographic Citation
- Biochemical and Biophysical Research Communications, vol. 319, no. 3, pp. 859-865
- Publication Year
- A new compound from Micromonospora sp. SA246, 9-hydroxycrisamicin-A (9-HCA-A), showed potential for activating hepatitis B virus (HBV) replication. To define the mechanism of 9-HCA-A, we used HepG2 2.2.15 cells which support HBV replication. 9-HCA-A activated HBV replication, increased episomal and integrated HBV DNA content, and increased secretions of HBV antigens (HBsAg and HBeAg) into culture medium. 9-HCA-A also activated HBV transcription in Hep2 2.2.15 cell line. To examine transcriptional control mechanisms, we analyzed the effect of 9-HCA-A on four different HBV promoters (Core, PreS1, PreS2, and X) in hepatoma cell line. 9-HCA-A responsive element was located at HBx promoter. By EMSA, we showed that 9-HCA-A activated the HBx promoter by detaching the 9-HCA-A responsive element binding protein (9H-REBP). Protein phosphatase (PP2A1) treatment detaches the 9H-REBP from the HBx promoter, similar to 9-HCA-A, while protein kinase A treatment does not detach the 9H-REBP from the HBx promoter. Our results showed that 9H- REBP functions as a repressor of HBV replication while 9-HCA-A activated protein phosphatase released the BP on the HBx promoter, thus activating HBV replication.
- 9-HydroxycrisamicinHBV-XMicromonospora sp. SA246PhosphorylationProtein phosphataseXPBP
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