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J Virol. 1990 May; 64(5): 2047-2056

Adenovirus type 5 packaging domain is composed of a repeated element that is functionally redundant.

Department of Microbiology, University of New York, Stony Brook 11794.

ABSTRACT

Previous analyses have demonstrated that adenovirus DNA is packaged into virions in vivo in a polar, left-to-right fashion. The packaging of viral DNA is dependent on cis-acting elements at the left end of the genome. In this report, we describe a genetic analysis of the sequences that are required for efficient packaging of adenovirus type 5 (Ad5) DNA. Our results demonstrate that the Ad5 packaging domain (nucleotides 194 to 358) is composed of at least five distinct elements that are functionally redundant. An AT-rich repeated sequence motif, the A repeat, is located in four of five of these regions; the fifth region is also AT rich. The efficiency of viral packaging depends on the number of individual A repeats that are present in the viral genome. The deletion of the entire packaging domain resulted in the loss of virus viability. A virus that contains a multimerized oligonucleotide corresponding to A repeat II in place of the packaging domain could package viral DNA, although with reduced efficiency compared with that of the wild-type virus. Our results also suggest that the spacing of specific sequences at the left end of the Ad5 genome are important for enhancer region function in vivo.

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