title: Expression of pre-S1, pre-S2, and C proteins in duck hepatitis B virus infection.
abstract: We have examined the expression of duck hepatitis B virus (DHBV)-associated proteins in experimentally infected ducks by an immunoblot (Western) method. The DHBV-related core protein, C protein, was identified at the position of 35,000 Da (P35). Pre-S proteins were recognized as two major bands (P37 and P28), the former representing pre-S1 and the latter pre-S2 protein. Expression of the proteins was examined in the early phase of infection in ducklings sequentially sacrificed from 6 hr postinoculation to 10 days. C protein (P35) was detected as early as 24 hr postinoculation. This timing coincided with the exponential increase of RNA transcripts and double-stranded viral DNA. Pre-S1/S2 proteins were detected at 3 days postinoculation. The early appearance of C protein suggested that the proteins were utilized for nucleic acid packaging. On the other hand, the late appearance of pre-S1/S2 proteins suggested that they were utilized in the production of virions near the end of the replication cycle.
authors.affiliation: First Department of Medicine, Chiba University School of Medicine, Japan.
authors.forename: O
authors.initials: O
authors.lastname: Yokosuka
authors.forename: M
authors.initials: M
authors.lastname: Omata
authors.forename: Y
authors.initials: Y
authors.lastname: Ito
mesh_terms: D000818:Animals; D015153:Blotting, Western; D002213:Capsid / Q000096:biosynthesis / Q000235:genetics; D004279:DNA, Viral / Q000096:biosynthesis; D004372:Ducks; D005786:Gene Expression Regulation; D006509:Hepatitis B / Q000382:microbiology / Q000662:veterinary*; D006515:Hepatitis B virus / Q000235:genetics*; D011201:Poultry Diseases / Q000382:microbiology*; D012333:RNA, Messenger / Q000096:biosynthesis; D014758:Viral Core Proteins / Q000096:biosynthesis / Q000235:genetics; D014763:Viral Matrix Proteins / Q000096:biosynthesis / Q000235:genetics; D014764:Viral Proteins / Q000096:biosynthesis* / Q000235:genetics
chemical_list: D004279:DNA, Viral; D012333:RNA, Messenger; D014758:Viral Core Proteins; D014763:Viral Matrix Proteins; D014764:Viral Proteins