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Transcription mapping and characterization of 284R and 121R proteins produced from early region 3 of bovine adenovirus type 3.

Abstract：

:We established the transcription map of early region (E) 3 of bovine adenovirus 3 (BAV-3) by Northern blot, S1 nuclease protection assays, cDNA sequencing, and RT-PCR analysis. Five major classes of mRNAs were identified, which shared the 3' ends. Four classes of mRNAs transcribed from the E3 promoter also shared the 5' end, while one major class of mRNA transcribed from the major late promoter contained a tripartite leader sequence at the 5' end. These five transcripts have the potential to encode four proteins, namely 284R, 121R, 86R, and 82R. To identify the proteins, rabbit antiserum was prepared using a bacterial fusion protein encoding 284R or 121R protein. Serum against 284R immunoprecipitated protein of 26-32 kDa in in vitro translated and transcribed mRNA and three proteins of 48, 67, and 125 kDa from BAV-3-infected cells. Western blots and enzymatic digestions confirmed that the 284R protein is a glycoprotein, which contains only N-linked oligosaccharides, both high mannose (48 kDa) and complex types (67 kDa). Serum against 121R immunoprecipitated a protein of 14.5 kDa from in vitro translated and transcribed mRNA and BAV-3-infected cells. Although 121R protein shows limited sequence similarity to a 14.7-kDa protein of human adenovirus 5, the 284R protein appears to be unique to BAV-3. Since proteins encoded by the E3 region appear to influence adenovirus pathogenesis, the 284R protein may contribute to the unique pathogenic properties of BAV-3.

journal_name

Virology

journal_title

Virology

authors

Idamakanti N,Reddy PS,Babiuk LA,Tikoo SK

doi

10.1006/viro.1999.9626

subject

Has Abstract

pub_date

1999-04-10 00:00:00

pages

351-9

issue

2

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(99)99626-5

journal_volume

256

pub_type

杂志文章

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