Characterization of cis-acting sequences involved in packaging porcine adenovirus type 3.
Encapsidation of adenovirus DNA involves specific interactions between cis-acting genomic DNA sequences and trans-acting proteins. The cis-acting packaging domain located near the left inverted terminal repeat is composed of a series of redundant but not functionally equivalent motifs. Such motifs are made up of the consensus sequence 5'-TTTGN(8)CG-3' and 5'-TTTG/A-3' in human adenovirus 5 (HAV-5) and canine adenovirus-2 (CAV-2), respectively. To gain comparative insight into adenovirus encapsidation, we examined the packaging domain of porcine adenovirus-3 (PAV-3). Using deletion mutants, we localized the PAV-3 packaging domain to 319 bp (nt 212 to 531), which contains six cis-acting elements. However, this domain does not contain the consensus motifs identified in HAV-5. In addition, consensus motif found in CAV-2 is present only once in PAV-3. Instead, PAV-3 packaging domain appears to contain AT/GC-rich sequences. The packaging motifs of PAV-3, which are functionally redundant but not equivalent, are located at the left end of the genome.
Xing
Li
L
Vaccine and Infectious Disease Organization, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E3.
Tikoo
Suresh Kumar
SK
D025662:Adenoviruses, Porcine / Q000235:genetics* / Q000378:metabolism*; D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D004742:Enhancer Elements, Genetic / Q000235:genetics*; D017353:Gene Deletion; D015967:Gene Expression Regulation, Viral; D008969:Molecular Sequence Data; D017422:Sequence Analysis, DNA; D019065:Virus Assembly