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Journal of Virology, April 2000, p. 3293-3300, Vol. 74, No. 7
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

The Lymphocytic Choriomeningitis Virus RING Protein Z Associates with Eukaryotic Initiation Factor 4E and Selectively Represses Translation in a RING-Dependent Manner

Elizabeth J. Campbell Dwyer,1 HuiKang Lai,2 Rhea C. MacDonald,1,2 Maria S. Salvato,3 and Katherine L. B. Borden1,2,*

Department of Biochemistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4H71; Department of Physiology and Biophysics, Mt. Sinai School of Medicine, New York, New York 100292; and Department of Pathology and Laboratory Medicine, University of Wisconsin, Madison, Wisconsin 53706-15323

Received 26 July 1999/Accepted 30 December 1999

Only a few host cell proteins that associate with arenaviruses have been identified. To date, the arenavirus Z protein associates with the promyelocytic leukemia protein PML and the ribosomal P proteins. The majority of PML is present in nuclear bodies which are translocated to the cytoplasm by infection with the arenavirus, lymphocytic choriomeningitis virus (LCMV). The Z protein is a small zinc-binding RING protein with an unknown function which is required for the viral life cycle. Here, we demonstrate an association between Z and the host cell translation factor, eukaryotic initiation factor 4E (eIF-4E) in infected and transfected cells. Z's association with both ribosomal proteins and this translation factor led us to investigate whether Z could modulate host cell translation. In cell culture, Z selectively represses protein production in an eIF-4E-dependent manner. Specifically, we see reduction in cyclin D1 protein production with no effect on glyceraldehyde-3-phosphate dehydrogenase (GAPDH) in cells transfected with Z. Previous reports indicate that cyclin D1 is sensitive to eIF-4E levels, whereas GAPDH is not. Consistent with this, we observe preferential downregulation of cyclin D1 during infection and no effect on GAPDH. Further, no changes in RNA levels were observed for cyclin D1 or GAPDH transcripts. The interaction between eIF-4E and Z may provide a mechanism for slower growth observed in infected cells and a viral strategy for establishing chronic infection.

* Corresponding author. Mailing address: Department of Physiology and Biophysics, Mt. Sinai School of Medicine, One Gustave Levy Pl., New York, NY 10029-6574. Phone: (212) 659-8677. Fax: (212) 849-2456. E-mail: kathyb{at}inka.mssm.edu.

Journal of Virology, April 2000, p. 3293-3300, Vol. 74, No. 7
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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