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. 1990 Sep;64(9):4281–4287. doi: 10.1128/jvi.64.9.4281-4287.1990

The genome of hepatitis B virus contains a second enhancer: cooperation of two elements within this enhancer is required for its function.

C H Yuh 1, L P Ting 1
PMCID: PMC247894  PMID: 2166817

Abstract

Previous studies have identified an enhancer (enhancer I) at nucleotides (nt) 1074 to 1234 in the genome of the human hepatitis B virus (HBV), which locates immediately upstream from the X gene. By analysis of the expression of the chloramphenicol acetyltransferase gene driven by a heterologous simian virus 40 early promoter, we describe the identification of a second enhancer (enhancer II) at nt 1636 to 1741, which locates downstream of enhancer I and immediately upstream of the core gene. With various deletions at the 5' end of enhancer II, a positive regulatory element was identified at nt 1636 to 1690 (the II-A element), with the 5' boundary between nt 1636 and 1671. The II-A element alone did not have an enhancer function, but the enhancer activity was achieved by the concomitant presence of the sequence from nt 1704 to 1741 (the II-B element). The II-B element alone did not have enhancer activity. These results indicate that cooperation between the II-A and II-B elements is required to exhibit the enhancer activity of enhancer II. We also show that enhancer II stimulates the transcriptional activity of both the SPI and SPII promoters of the surface gene. Therefore, the SPI promoter activity is regulated by the proximal HNF-1 binding element and the distal enhancers I and II. These results indicate that multiple regulatory elements scattered over the whole viral genome are involved in the regulation of expression of each individual HBV gene and that the same regulatory element controls the expression of different HBV genes. The relative positions of these regulatory elements in the HBV genome suggest that they may control the expression of HBV genes in a coordinate and cooperative manner.

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Selected References

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