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Journal of Virology, November 2005, p. 14004-14016, Vol. 79, No. 22
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.22.14004-14016.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Adenovirus Exploits the Cellular Aggresome Response To Accelerate Inactivation of the MRN Complex

Yue Liu,1 Anna Shevchenko,2 Andrej Shevchenko,2 and Arnold J. Berk1*

Molecular Biology Institute and Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, California 90095,1 Max Planck Institute For Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, 01307 Dresden, Germany2

Received 8 June 2005/ Accepted 18 August 2005

Results reported here indicate that adenovirus 5 exploits the cellular aggresome response to accelerate inactivation of MRE11-RAD50-NBS1 (MRN) complexes that otherwise inhibit viral DNA replication and packaging. Aggresomes are cytoplasmic inclusion bodies, observed in many degenerative diseases, that are formed from aggregated proteins by dynein-dependent retrograde transport on microtubules to the microtubule organizing center. Viral E1B-55K protein forms aggresomes that sequester p53 and MRN in transformed cells and in cells transfected with an E1B-55K expression vector. During adenovirus infection, the viral protein E4orf3 associates with MRN in promyelocytic leukemia protein nuclear bodies before MRN is bound by E1B-55K. Either E4orf3 or E4orf6 is required in addition to E1B-55K for E1B-55K aggresome formation and MRE11 export to aggresomes in adenovirus-infected cells. Aggresome formation contributes to the protection of viral DNA from MRN activity by sequestering MRN in the cytoplasm and greatly accelerating its degradation by proteosomes following its ubiquitination by the E1B-55K/E4orf6/elongin BC/Cullin5/Rbx1 ubiquitin ligase. Our results show that aggresomes significantly accelerate protein degradation by the ubiquitin-proteosome system. The observation that a normal cellular protein is inactivated when sequestered into an aggresome through association with an aggresome-inducing protein has implications for the potential cytotoxicity of aggresome-like inclusion bodies in degenerative diseases.

* Corresponding author. Mailing address: UCLA/MBI, 611 Young Dr. E, Los Angeles, CA 90095-1570. Phone: (310) 206-6298. Fax: (310) 206-7286. E-mail: berk{at}mbi.ucla.edu.

Journal of Virology, November 2005, p. 14004-14016, Vol. 79, No. 22
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.22.14004-14016.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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