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Journal of Virology, April 2007, p. 3447-3454, Vol. 81, No. 7
0022-538X/07/$08.00+0     doi:10.1128/JVI.02097-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Formation of a Multiple Protein Complex on the Adenovirus Packaging Sequence by the IVa2 Protein

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

Received 25 September 2006/ Accepted 10 January 2007

During adenovirus virion assembly, the packaging sequence mediates the encapsidation of the viral genome. This sequence is composed of seven functional units, termed A repeats. Recent evidence suggests that the adenovirus IVa2 protein binds the packaging sequence and is involved in packaging of the genome. Study of the IVa2-packaging sequence interaction has been hindered by difficulty in purifying the protein produced in virus-infected cells or by recombinant techniques. We report the first purification of a recombinant untagged version of the adenovirus IVa2 protein and characterize its binding to the packaging sequence in vitro. Our data indicate that there is more than one IVa2 binding site within the packaging sequence and that IVa2 binding to DNA requires the A-repeat consensus, 5'-TTTG-(N₈)-CG-3'. Furthermore, we present evidence that IVa2 forms a multimeric complex on the packaging sequence. These data support a model in which adenovirus DNA packaging occurs via the formation of a IVa2 multiprotein complex on the packaging sequence.

Published ahead of print on 17 January 2007.

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