MxA GTPase blocks reporter gene expression of reconstituted Thogoto virus ribonucleoprotein complexes.

Abstract:

:Human MxA protein accumulates in the cytoplasm of interferon-treated cells and inhibits the multiplication of several RNA viruses, including Thogoto virus (THOV), a tick-borne orthomyxovirus that transcribes and replicates its genome in the cell nucleus. The antiviral mechanism of MxA was investigated by using two alternative minireplicon systems in which recombinant viral ribonucleoprotein complexes (vRNPs) of THOV were reconstituted from cloned cDNAs. A chloramphenicol acetyltransferase reporter minigenome RNA was expressed either by T7 RNA polymerase in the cytoplasm of transfected cells or, alternatively, by RNA polymerase I in the nucleus. The inhibitory effect of MxA was studied in both cellular compartments by coexpressing wild-type MxA or TMxA, an artificial nuclear form of MxA. Our results indicate that both MxA proteins recognize the assembled vRNP rather than the newly synthesized unassembled components. The present findings are consistent with previous data which indicated that cytoplasmic MxA prevents transport of vRNPs into the nucleus, whereas nuclear MxA directly inhibits the viral polymerase activity in the nucleus.

journal_name

J Virol

journal_title

Journal of virology

authors

Weber F,Haller O,Kochs G

doi

10.1128/jvi.74.1.560-563.2000

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

560-3

issue

1

eissn

0022-538X

issn

1098-5514

journal_volume

74

pub_type

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