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Journal of Virology, March 2000, p. 2550-2557, Vol. 74, No. 6
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

The Epstein-Barr Virus Pol Catalytic Subunit Physically Interacts with the BBLF4-BSLF1-BBLF2/3 Complex

Ken Fujii,1,2 Naoaki Yokoyama,1 Tohru Kiyono,1 Kiyotaka Kuzushima,1 Michio Homma,2 Yukihiro Nishiyama,3 Masatoshi Fujita,1 and Tatsuya Tsurumi1,*

Division of Virology, Aichi Cancer Center Research Institute, Chikusa-ku, Nagoya 464-8681,1 Division of Biological Science, Nagoya University Graduate School of Science, Chikusa-ku, Nagoya 464-8602,2 and Laboratory of Virology, Nagoya University School of Medicine, Showa-ku, Nagoya 466-8550,3 Japan

Received 13 September 1999/Accepted 22 December 1999

The Epstein-Barr virus (EBV)-encoded replication proteins that account for the basic reactions at the replication fork are thought to be the EBV Pol holoenzyme, consisting of the BALF5 Pol catalytic and the BMRF1 Pol accessory subunits, the putative helicase-primase complex, comprising the BBLF4, BSLF1, and BBLF2/3 proteins, and the BALF2 single-stranded DNA-binding protein. Immunoprecipitation analyses using anti-BSLF1 or anti-BBLF2/3 protein-specific antibody with clarified lysates of B95-8 cells in a viral productive cycle suggested that the EBV Pol holoenzyme physically interacts with the BBLF4-BSLF1-BBLF2/3 complex to form a large complex. Although the complex was stable in 500 mM NaCl and 1% NP-40, the BALF5 protein became dissociated in the presence of 0.1% sodium dodecyl sulfate. Experiments using lysates from insect cells superinfected with combinations of recombinant baculoviruses capable of expressing each of viral replication proteins showed that not the BMRF1 Pol accessory subunit but rather the BALF5 Pol catalytic subunit directly interacts with the BBLF4-BSLF1-BBLF2/3 complex. Furthermore, double infection with pairs of recombinant viruses revealed that each component of the BBLF4-BSLF1-BBLF2/3 complex makes contact with the BALF5 Pol catalytic subunit. The interactions of the EBV DNA polymerase with the EBV putative helicase-primase complex warrant particular attention because they are thought to coordinate leading- and lagging-strand DNA synthesis at the replication fork.

* Corresponding author. Mailing address: Division of Virology, Aichi Cancer Center Research Institute, 1-1 Kanokoden, Chikusa-ku, Nagoya 464-8682, Japan. Phone and fax: 81 52 764 2979. E-mail: ttsurumi{at}aichi-cc.pref.aichi.jp.

Journal of Virology, March 2000, p. 2550-2557, Vol. 74, No. 6
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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