Abstract
Hepatitis B virus (HBV) replicates by reverse transcription of an RNA intermediate, the pregenomic RNA. The first step of HBV genome replication is the encapsidation of the pregenomic RNA encoding the encapsidation signal, termed ε, into the core particles, which is preceded by recognition and binding of HBV DNA polymerase to ε. The pregenomic RNA contains two identical ε elements due to its terminal redundancy: one near the 5' end and another near the 3' end. Despite the fact that both ε elements have an identical sequence, only the 5' ε, but not the 3' ε, is functional for encapsidation. To understand the molecular nature of this position effect, we made a series of lacZ RNA expression plasmids which contain the ε element at various positions from the 5' end of the transcripts. Following transfection, the lacZ RNAs in cytoplasmic core particles were measured by RNase protection assay for encapsidation. The results indicated that the lacZ RNAs with positioned up to 65 nucleotides from the 5' end were encapsidated, whereas the lacZ RNAs with ε positioned further downstream were not. Interestingly, the cap-free lacZ RNA transcribed by T7 RNA polymerase was not encapsidated, implying that the 5' cap structure is required for encapsidation of the pregenomic RNA. We hypothesized that HBV DNA polymerase must somehow recognize the cap structure and/or its associated factors, as well as the 5' ε, for encapsidation to occur.
| Original language | English |
|---|---|
| Pages (from-to) | 5502-5508 |
| Number of pages | 7 |
| Journal | Journal of Virology |
| Volume | 74 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2000 Jun 22 |
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All Science Journal Classification (ASJC) codes
- Immunology
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Evidence that the 5'-end cap structure is essential for encapsidation of hepatitis B virus pregenomic RNA. / Jeong, Jong Keun; Yoon, Gye Soon; Ryu, Wang-Shick.
In: Journal of Virology, Vol. 74, No. 12, 22.06.2000, p. 5502-5508.Research output: Contribution to journal › Article
TY - JOUR
T1 - Evidence that the 5'-end cap structure is essential for encapsidation of hepatitis B virus pregenomic RNA
AU - Jeong, Jong Keun
AU - Yoon, Gye Soon
AU - Ryu, Wang-Shick
PY - 2000/6/22
Y1 - 2000/6/22
N2 - Hepatitis B virus (HBV) replicates by reverse transcription of an RNA intermediate, the pregenomic RNA. The first step of HBV genome replication is the encapsidation of the pregenomic RNA encoding the encapsidation signal, termed ε, into the core particles, which is preceded by recognition and binding of HBV DNA polymerase to ε. The pregenomic RNA contains two identical ε elements due to its terminal redundancy: one near the 5' end and another near the 3' end. Despite the fact that both ε elements have an identical sequence, only the 5' ε, but not the 3' ε, is functional for encapsidation. To understand the molecular nature of this position effect, we made a series of lacZ RNA expression plasmids which contain the ε element at various positions from the 5' end of the transcripts. Following transfection, the lacZ RNAs in cytoplasmic core particles were measured by RNase protection assay for encapsidation. The results indicated that the lacZ RNAs with positioned up to 65 nucleotides from the 5' end were encapsidated, whereas the lacZ RNAs with ε positioned further downstream were not. Interestingly, the cap-free lacZ RNA transcribed by T7 RNA polymerase was not encapsidated, implying that the 5' cap structure is required for encapsidation of the pregenomic RNA. We hypothesized that HBV DNA polymerase must somehow recognize the cap structure and/or its associated factors, as well as the 5' ε, for encapsidation to occur.
AB - Hepatitis B virus (HBV) replicates by reverse transcription of an RNA intermediate, the pregenomic RNA. The first step of HBV genome replication is the encapsidation of the pregenomic RNA encoding the encapsidation signal, termed ε, into the core particles, which is preceded by recognition and binding of HBV DNA polymerase to ε. The pregenomic RNA contains two identical ε elements due to its terminal redundancy: one near the 5' end and another near the 3' end. Despite the fact that both ε elements have an identical sequence, only the 5' ε, but not the 3' ε, is functional for encapsidation. To understand the molecular nature of this position effect, we made a series of lacZ RNA expression plasmids which contain the ε element at various positions from the 5' end of the transcripts. Following transfection, the lacZ RNAs in cytoplasmic core particles were measured by RNase protection assay for encapsidation. The results indicated that the lacZ RNAs with positioned up to 65 nucleotides from the 5' end were encapsidated, whereas the lacZ RNAs with ε positioned further downstream were not. Interestingly, the cap-free lacZ RNA transcribed by T7 RNA polymerase was not encapsidated, implying that the 5' cap structure is required for encapsidation of the pregenomic RNA. We hypothesized that HBV DNA polymerase must somehow recognize the cap structure and/or its associated factors, as well as the 5' ε, for encapsidation to occur.
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U2 - 10.1128/JVI.74.12.5502-5508.2000
DO - 10.1128/JVI.74.12.5502-5508.2000
M3 - Article
VL - 74
SP - 5502
EP - 5508
JO - Journal of Virology
JF - Journal of Virology
SN - 0022-538X
IS - 12
ER -