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Journal of Virology, March 2002, p. 3038-3044, Vol. 76, No. 6
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.6.3038-3044.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Equine Infectious Anemia Virus and the Ubiquitin-Proteasome System

David E. Ott,1* Lori V. Coren,1 Raymond C. Sowder, II,1 Julian Adams,2 Kunio Nagashima,3 and Ulrich Schubert4,5

AIDS Vaccine Program,1 Research Technology Program, SAIC Frederick, National Cancer Institute at Frederick, Frederick, Maryland 21702,3 Millennium Pharmaceuticals, Cambridge, Massachusetts 02139,2 Laboratory of Viral Diseases, National Institute of Allergy and Infections Diseases, National Institutes of Health, Bethesda, Maryland 20892,4 Heinrich-Pette-Institute, Hamburg, Germany 202515

Received 31 August 2001/ Accepted 12 December 2001

Some retroviruses contain monoubiquitinated Gag and do not bud efficiently from cells treated with proteasome inhibitors, suggesting an interaction between the ubiquitin-proteasome system and retrovirus assembly. We examined equine infectious anemia virus (EIAV) particles and found that approximately 2% of the p9Gag proteins are monoubiquitinated, demonstrating that this Gag protein interacts with an ubiquitinating activity. Different types of proteasome inhibitors were used to determine if proteasome inactivation affects EIAV release from chronically infected cells. Pulse-chase immunoprecipitation and time course immunoblot analyses showed that proteasome inactivation slightly decreased virus release (at most a twofold effect), while it did not affect Gag processing. These results contrast with those obtained with other viruses which are sensitive to these inhibitors. This suggests that, although its Gag is monoubiquitinated, the requirements for EIAV release are somewhat different from those for retroviruses that are sensitive to proteasome inhibitors.

* Corresponding author. Mailing address: AIDS Vaccine Program, SAIC Frederick, National Cancer Institute at Frederick, Frederick, MD 21702-1201. Phone: (301) 846-5723. Fax: (301) 846-5588. E-mail: ott{at}ncifcrf.gov.

Journal of Virology, March 2002, p. 3038-3044, Vol. 76, No. 6
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.6.3038-3044.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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