The leader polypeptide of Theiler's murine encephalomyelitis virus is required for the assembly of virions in mouse L cells.

Abstract:

:Deletion of the entire leader polypeptide of the GDVII strain of Theiler's murine encephalomyelitis virus (TMEV) results in the production of an attenuated virus that grows in baby hamster kidney (BHK) cells but cannot grow at all in mouse L-929 cells. This study examined the reasons for the failure of dl-L, the GDVII variant that lacks the leader polypeptide, to grow in mouse cells. At low multiplicities of infection, it was difficult to detect any viral proteins in mouse cells. However, levels of positive- and negative-strand RNA molecules were only moderately reduced in these infections. Viral RNA showed no major defect in translatability, as the mutant viral RNA was nearly as efficient as that of the wild-type (WT) virus in directing protein synthesis in vitro in assays using extracts prepared from mouse L cells. Viral protein synthesis was detected in dl-L-infected mouse cells as multiplicities of infection were increased and approached the levels observed in WT infections. Despite this, there was a total lack of virus production in high-multiplicity infections, and this was found to correlate with the failure of viral proteins and early virion precursors to assemble into virions in mouse cells. Thus, the inability of dl-L to grow in mouse cells reflects complex effects on various stages of the virus infection but is primarily a defect in virus assembly.

journal_name

J Virol

journal_title

Journal of virology

authors

Badshah C,Calenoff MA,Rundell K

doi

10.1128/jvi.74.2.875-882.2000

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

875-82

issue

2

eissn

0022-538X

issn

1098-5514

journal_volume

74

pub_type

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