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PMID: 17005665 Published · ppublish English Journal Article Research Support, N.I.H., Extramural

Preferential translation of vesicular stomatitis virus mRNAs is conferred by transcription from the viral genome.

Journal of virology ·Vol. 80 ·No. 23 ·2006-12-00 ·Pages 11733-42

Whitlow ZW, Connor JH, Lyles DS

Abstract

Host protein synthesis is inhibited in cells infected with vesicular stomatitis virus (VSV). It has been proposed that viral mRNAs are subjected to the same inhibition but are predominantly translated because of their abundance. To compare translation efficiencies of viral and host mRNAs during infection, we used an enhanced green fluorescent protein (EGFP) reporter expressed from a recombinant virus or from the host nucleus in stably transfected cells. Translation efficiency of host-derived EGFP mRNA was reduced more than threefold at eight hours postinfection, while viral-derived mRNA was translated around sevenfold more efficiently than host-derived EGFP mRNA in VSV-infected cells. To test whether mRNAs transcribed in the cytoplasm are resistant to shutoff of translation during VSV infection, HeLa cells were infected with a recombinant simian virus 5 (rSV5) that expressed GFP. Cells were then superinfected with VSV or mock superinfected. GFP mRNA transcribed by rSV5 was not resistant to translation inhibition during superinfection with VSV, indicating that transcription in the cytoplasm is not sufficient for preventing translation inhibition. To determine if cis-acting sequences in untranslated regions (UTRs) were involved in preferential translation of VSV mRNAs, we constructed EGFP reporters with VSV or control UTRs and measured the translation efficiency in mock-infected and VSV-infected cells. The presence of VSV UTRs did not affect mRNA translation efficiency in mock- or VSV-infected cells, indicating that VSV mRNAs do not contain cis-acting sequences that influence translation. However, we found that when EGFP mRNAs transcribed by VSV or by the host were translated in vitro, VSV-derived EGFP mRNA was translated 22 times more efficiently than host-derived EGFP mRNA. This indicated that VSV mRNAs do contain cis-acting structural elements (that are not sequence based), which enhance translation efficiency of viral mRNAs.

MeSH Terms
Genome, Viral HeLa Cells Humans Protein Biosynthesis/physiology RNA, Messenger/metabolism RNA, Viral/metabolism Transcription, Genetic/physiology Vesicular stomatitis Indiana virus/genetics,metabolism,physiology Viral Proteins/biosynthesis
Chemicals
RNA, Messenger RNA, Viral Viral Proteins
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Whitlow Zackary W
Department of Biochemistry, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA. [email protected]
Connor John H
Lyles Douglas S
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Article Info
Journal
Journal of virology
Abbr.
J Virol
ISSN
0022-538X
DOI
10.1128/JVI.00971-06
Email
[email protected]
Published
2006-12-00
Epub
2006-00-27
Pages
11733-42
Language
English
Region
United States
NLM ID
0113724
PMCID
PMC1642595
Subset
IM
Grants
NIAID NIH HHS · R01 AI052304 · United States
NIAID NIH HHS · R01 AI 052304 · United States
External Links
PubMed source DOI: 10.1128/JVI.00971-06 PMC Full Text View journal details
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