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Journal of Virology, February 2006, p. 1965-1971, Vol. 80, No. 4
0022-538X/06/$08.00+0     doi:10.1128/JVI.80.4.1965-1971.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Dependence of the Encapsidation Function of the Adenovirus L1 52/55-Kilodalton Protein on Its Ability To Bind the Packaging Sequence

Pilar Perez-Romero, Kurt E. Gustin,{dagger} and Michael J. Imperiale*

Department of Microbiology and Immunology and Comprehensive Cancer Center, University of Michigan Medical School, Ann Arbor, Michigan 48109-0942

Received 10 October 2005/ Accepted 20 November 2005

The adenovirus IVa2 and L1 52/55-kDa proteins are involved in the assembly of new virus particles. Both proteins bind to the packaging sequence of the viral chromosome, and the lack of expression of either protein results in no virus progeny: the absence of the L1 52/55-kDa protein leads to formation of only empty capsids, and the absence of the IVa2 protein results in no capsid assembly. Furthermore, the IVa2 and L1 52/55-kDa proteins interact with each other during adenovirus infection. However, what is not yet clear is when and how this interaction occurs during the course of the viral infection. We defined the domains of the L1 52/55-kDa protein required for interaction with the IVa2 protein, DNA binding, and virus replication by constructing L1 52/55-kDa protein truncations. We found that the N-terminal 173 amino acids of the L1 52/55-kDa protein are essential for interaction with the IVa2 protein. However, for both DNA binding and complementation of the pm8001 mutant virus, which does not express the L1 52/55-kDa protein, the amino-terminal 331 amino acids of the L1 52/55-kDa protein are necessary. These results suggest that the production of infectious virus particles depends on the ability of the L1 52/55-kDa protein to bind to DNA.

* Corresponding author. Mailing address: University of Michigan Medical School, 6304 Cancer Center, 1500 E. Medical Center Dr., Ann Arbor, MI 48109-0942. Phone: (734) 763-9162. Fax: (734) 615-6560. E-mail: imperial{at}umich.edu.

{dagger} Present address: Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID 83844.

Journal of Virology, February 2006, p. 1965-1971, Vol. 80, No. 4
0022-538X/06/$08.00+0     doi:10.1128/JVI.80.4.1965-1971.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Wohl, B. P., Hearing, P. (2008). Role for the L1-52/55K Protein in the Serotype Specificity of Adenovirus DNA Packaging. J. Virol. 82: 5089-5092 [Abstract] [Full Text]  


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