Summary
The pattern of Interferon (IFN) production in virus-infected cells has been compared with the rate of bulk cellular protein synthesis, on one hand, and with the synthesis of representative cell and virus proteins such as actin, the γ and the NP proteins of encephalomyocarditis (EMC) and Newcastle Disease (NDV) viruses, on the other hand. This was investigated under conditions of impaired protein synthesis such as i) high osmolarity media, ii) a virus-induced shut-off, and iii) in cells exposed to relatively low doses of cycloheximide (CXM), which slow elongation of protein chain and thus favour the translation of low-affinity messenger RNAs (mRNAs). In each instance IFN production was compared with35S-methionine incorporation into TCA-precipitable materials and into SDS-polyacrylamide gel-analysed proteins.
Data obtained from each of the experimental approachesall indicate that IFN production and cellular protein synthesis are modified in a closely related fashion suggesting that their mRNAs share a similar degree of affinity for ribosomes. Conversely, two mRNAs coding for representative EMC and NDV virus proteins exhibit, respectively, the highest and the lowest affinity for ribosomes as compared to actin mRNA.
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Abbreviations
- VSV:
-
Vesicular stomatitis virus
- IFN:
-
Interferon
- EMC:
-
Encephalomyocarditis virus
- NDV:
-
Newcastle disease virus
- MOI:
-
multiplicity of infection
- PFU:
-
plaque-forming units
- FCS:
-
fetal calf serum
- PBS:
-
phosphate-buffered saline
- HCI:
-
hydrochloric acid
- TCA:
-
trichloroacetic acid
- CXM:
-
cycloheximide
- SDS:
-
sodium dodecyl sulphate
- NP:
-
nucleocapsid protein
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Sorrentino, V., Battistini, A., di Francesco, P. et al. Interferon production in L929 cells under impaired translational conditions: Comparison of rates of interferon, actin, Newcastle disease and encephalomyocarditis viruses mRNAs initiation of protein synthesis. Archives of Virology 88, 175–187 (1986). https://doi.org/10.1007/BF01310873
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DOI: https://doi.org/10.1007/BF01310873