Cell-specific roles of domains I and II of HCV 5'untranslated region in the translation initiation activity / 南方医科大学学报
Journal of Southern Medical University
;
(12): 1826-1829, 2014.
Article
in Chinese
| WPRIM
| ID: wpr-329191
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the roles of Domain I and Domain II of hepatitis C virus (HCV) 5' untranslated region (UTR) in the translation initiation activity of HCV 5'UTR in different host cell lines.</p><p><b>METHODS</b>The eukaryotic expression plasmid pCMVNCRLuc (pCN1), in which full-length HCV 5'UTR regulates firefly luciferase expression, was modified by deleting Domain I and the downstream single-stranded sequence (43 bp in total) from the UTR (pCNl-d2), Domain I with the downstream single-stranded sequence and Domain II (118 bp in total) from the UTR (pCNl-d3), or the total UTR (pCNl-d5). The modified plasmids were transfected via liposome into different cell lines with pRL-TK plasmid co-transfected as the normalization control. At 36 h after the transfection, the total cellular RNA was harvested for semi-quantitative RT-PCR, and the relative expression activities of luciferase were assayed with a dual luciferase reporter gene assay system. The translation initiation activities of the truncated HCV 5'UTRs in different translation systems were analyzed.</p><p><b>RESULTS</b>Deletion of Domain I and the downstream single-stranded sequence caused no significant changes of the translational activity of HCV 5'UTR in Hela or C6 cells, but decreased the translational activity by 46% in L-02 cells and increased the translational activity by 46% in 293T cells. Deletion of both Domain I and Domain II resulted in decreased translational activity of HCV 5'UTR by 51% in HeLa cells, but increased the translational activity by 40% in L-02 cells, 60% in C6 cells and 135% in 293T cells.</p><p><b>CONCLUSIONS</b>Domain I and Domain II of HCV 5'UTR perform cell type-specific roles in HCV IRES-driven translation initiation.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Plasmids
/
Protein Biosynthesis
/
RNA, Viral
/
HeLa Cells
/
Transfection
/
Genes, Reporter
/
Hepacivirus
/
5' Untranslated Regions
/
Genetics
/
Luciferases
Limits:
Humans
Language:
Chinese
Journal:
Journal of Southern Medical University
Year:
2014
Type:
Article
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