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Journal of Virology, April 2000, p. 3330-3337, Vol. 74, No. 7
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Degradation of Tobacco Mosaic Virus Movement Protein by the 26S Proteasome

Christoph Reicheldagger and Roger N. Beachy*

Division of Plant Biology, Department of Cell Biology, The Scripps Research Institute, La Jolla, California 92037

Received 20 September 1999/Accepted 2 December 1999

Cell-to-cell spread of tobacco mosaic virus is facilitated by the virus-encoded 30-kDa movement protein (MP). This process involves interaction of viral proteins with host components, including the cytoskeleton and the endoplasmic reticulum (ER). During virus infection, high-molecular-weight forms of MP were detected in tobacco BY-2 protoplasts. Inhibition of the 26S proteasome by MG115 and clasto-lactacystin-beta -lactone enhanced the accumulation of high-molecular-weight forms of MP and led to increased stability of the MP. Such treatment also increased the apparent accumulation of polyubiquitinated host proteins. By fusion of MP with the jellyfish green fluorescent protein (GFP), we demonstrated that inhibition of the 26S proteasome led to accumulation of the MP-GFP fusion preferentially on the ER, particularly the perinuclear ER. We suggest that polyubiquitination of MP and subsequent degradation by the 26S proteasome may play a substantial role in regulation of virus spread by reducing the damage caused by the MP on the structure of cortical ER.

* Corresponding author. Present address: The Donald Danforth Plant Science Center, 7425 Forsyth Blvd., Box 1098, St. Louis, MO 63130. Phone: (314) 935-5755. Fax: (314) 935-8605. E-mail: rnbeachy{at}danforthcenter.org.

dagger Present address: GPC-AG, Genome Pharmaceuticals Corporation, 82152 Martinsried, Germany.

Journal of Virology, April 2000, p. 3330-3337, Vol. 74, No. 7
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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