title: Regeneration of the replication-associated proteins tandem direct repeat recognition nucleotide sequence at the origin of DNA replication of porcine circovirus type 1.
abstract: Four copies of a hexanucleotide (H) sequence are located to the right of the palindrome at the origin of DNA replication of the porcine circovirus type 1 (PCV1) genome. These sequences are organized in two direct tandems, the proximal H1/H2 and the distal H3/H4 repeats, and they have been shown to be binding sites for the essential Rep and Rep' proteins. Previous work demonstrated that infectious PCV1 virion can accommodate a variable number of H sequences at the origin of DNA replication. In this work, mutational analysis was conducted to elucidate the critical core element within the hexanucleotide with respect to self-DNA replication and progeny virus synthesis. It was found that while a single H sequence abutting the palindrome is sufficient for PCV1 viability, a tandem repeat arrangement is the more stable and thus preferred configuration. Within the H sequence, selected nucleotides at specific positions are critical for Rep-associated protein recognition and for viral DNA replication.
authors.affiliation: Virus and Prion Diseases of Livestock Research Unit, National Animal Disease Center, PO Box 70, Ames, IA 50010, USA. acheung@nadc.ars.usda.gov
authors.forename: Andrew K
authors.initials: AK
authors.lastname: Cheung
mesh_terms: D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D017925:Circovirus / Q000235:genetics* / Q000502:physiology; D004261:DNA Replication; D004279:DNA, Viral / Q000096:biosynthesis / Q000235:genetics; D008969:Molecular Sequence Data; D009154:Mutation; D018741:Replication Origin / Q000235:genetics*; D020080:Tandem Repeat Sequences / Q000235:genetics*; D014764:Viral Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D014779:Virus Replication
chemical_list: D004279:DNA, Viral; D014764:Viral Proteins