Influenza virus NS1 protein enhances the rate of translation initiation of viral mRNAs.

Abstract:

:The effect of NS1 protein on the efficiency of influenza virus mRNA translation was evaluated by determining the accumulation of nucleoprotein (NP) or M1 mRNAs in the cytoplasm of cells expressing either of these genes alone or in combination with the NS1 gene, as well as the total cell accumulation of NP or M1 protein. Coexpression of NS1, but not of NS2 protein, led to increases in the translation of these mRNAs in the range of 5- to 100-fold. This translation enhancement was specific for viral mRNAs, since the translation of neither cat nor lacZ mRNAs was affected by the coexpression of NS1 protein. The use of chimeric cat genes containing the 5'-extracistronic sequences of the influenza virus mRNAs corresponding to segment 2, 7, or 8 indicated that these sequences can in part account for the observed effect. The enhancement of viral mRNA translation mediated by NS1 protein was due to an increase in the translation initiation rate, since the sizes of NP-specific polysomes, but not those of lacZ-specific polysomes, was significantly higher in cells coexpressing NS1 protein than in those expressing only the NP gene.

journal_name

J Virol

journal_title

Journal of virology

authors

de la Luna S,Fortes P,Beloso A,Ortín J

doi

10.1128/JVI.69.4.2427-2433.1995

subject

Has Abstract

pub_date

1995-04-01 00:00:00

pages

2427-33

issue

4

eissn

0022-538X

issn

1098-5514

journal_volume

69

pub_type

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