Evidence that a capped oligoribonucleotide is the primer for duck hepatitis B virus plus-strand DNA synthesis.
The plus strand of virion DNA of duck hepatitis B virus possessed, at its 5' terminus, a capped oligoribonucleotide 18 to 19 bases in length. This oligoribonucleotide had a unique 5' end, the heterogeneity in length reflecting two distinct junctions with plus-strand DNA that were 1 base apart. The sequence of the RNA differed from that predicted by the sequence of duck hepatitis B virus upstream of the 5' ends of plus-strand DNA but was identical to a downstream sequence corresponding to the 5' terminus of a major poly(A)+ viral RNA mapped by Büscher and co-workers (Cell 40:717-724, 1985). This RNA transcript is thought to serve as the template (i.e., the pregenome) for minus-strand synthesis via reverse transcription. The results suggest that the pregenome also donates a capped oligoribonucleotide that acts as the primer of plus-strand DNA synthesis, using the minus-strand DNA as template.
J M
JM
Lien
C E
CE
Aldrich
W S
WS
Mason
D001483:Base Sequence; D004261:DNA Replication; D004279:DNA, Viral / Q000096:biosynthesis*; D004372:Ducks; D006515:Hepatitis B virus / Q000235:genetics / Q000502:physiology*; D008957:Models, Genetic; D012313:RNA / Q000502:physiology*; D012315:RNA Caps / Q000502:physiology*; D012367:RNA, Viral / Q000502:physiology*; D013698:Templates, Genetic; D014779:Virus Replication
D004279:DNA, Viral; D012315:RNA Caps; C034477:RNA primers; D012367:RNA, Viral; D012313:RNA