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Archives of Virology

, Volume 141, Issue 3–4, pp 425–438 | Cite as

Characterization of nuclear localization of a hepatitis B virus precore protein derivative P22

  • C. -T. Yeh
  • L. -H. Hong
  • J. -H. Ou
  • C. -M. Chu
  • Y. -F. Liaw
Original Papers

Summary

Both of hepatitis B virus core protein and a precore protein derivative, named P22, have been shown to localize in the nucleus. Although P22 has ten additional amino acid residues at its amino-terminus, both proteins contain the same nuclear localization signal. In order to understand the mechanism that regulates the activity of this signal, we have studied the nuclear localization of P22 and compared it with that of core protein. It was found that both cytosolic and nuclear fractions of P22 were phosphorylated but to a lesser extent when compared with cytosolic core protein. This distinction was likely attributed to different conformations between these two proteins since the density gradient analysis revealed a different particle formation for P22 in the cytosol. When expressed in Vero cells synchronized by serum deprivation, P22 remained in the cytosol during G0 and G1 phases, accumulated gradually in the nucleus during S phase, and largely localized in the nucleus when cells were confluent. On the other hand, the core protein was transported into the nucleus during mid-G1 phase, shuttled back to the cytosol in S phase and again accumulated in the nucleus when cells were confluent. Interestingly, when aphidicolin was used to arrest the cells in late G1 phase, both proteins were found to accumulate in the nuclei. These results indicated that although both P22 and core proteins possessed the same nuclear localization signal, the cellular regulation of their nuclear transport was not identical and might involve different molecular mechanisms.

Keywords

Cytosol Nuclear Localization Core Protein Vero Cell Nuclear Localization Signal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • C. -T. Yeh
    • 1
  • L. -H. Hong
    • 1
  • J. -H. Ou
    • 2
  • C. -M. Chu
    • 1
  • Y. -F. Liaw
    • 1
  1. 1.Liver Research UnitChang Gung Memorial Hospital and Chang Gung Medical CollegeTaipeiTaiwan
  2. 2.Department of Molecular Microbiology and ImmunologyUniversity of Southern CaliforniaLos AngelesUSA

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