Analysis of Venezuelan equine encephalitis virus capsid protein function in the inhibition of cellular transcription

Natalia Garmashova, Svetlana Atasheva, Wenli Kang, Scott Weaver, Elena Frolova, Ilya Frolov

Research output: Contribution to journalArticle

82 Citations (Scopus)

Abstract

The encephalitogenic New World alphaviruses, including Venezuelan (VEEV), eastern (EEEV), and western equine encephalitis viruses, constitute a continuing public health threat in the United States. They circulate in Central, South, and North America and have the ability to cause fatal disease in humans and in horses and other domestic animals. We recently demonstrated that these viruses have developed the ability to interfere with cellular transcription and use it as a means of downregulating a cellular antiviral response. The results of the present study suggest that the N-terminal, ∼35-amino-acid-long peptide of VEEV and EEEV capsid proteins plays the most critical role in the downregulation of cellular transcription and development of a cytopathic effect. The identified VEEV-specific peptide CVEE33-68 includes two domains with distinct functions: the α-helix domain, helix I, which is critically involved in supporting the balance between the presence of the protein in the cytoplasm and nucleus, and the downstream peptide, which might contain a functional nuclear localization signal(s). The integrity of both domains not only determines the intracellular distribution of the VEEV capsid but is also essential for direct capsid protein functioning in the inhibition of transcription. Our results suggest that the VEEV capsid protein interacts with the nuclear pore complex, and this interaction correlates with the protein's ability to cause transcriptional shutoff and, ultimately, cell death. The replacement of the N-terminal fragment of the VEEV capsid by its Sindbis virus-specific counterpart in the VEEV TC-83 genome does not affect virus replication in vitro but reduces cytopathogenicity and results in attenuation in vivo. These findings can be used in designing a new generation of live, attenuated, recombinant vaccines against the New World alphaviruses.

Original languageEnglish (US)
Pages (from-to)13552-13565
Number of pages14
JournalJournal of Virology
Volume81
Issue number24
DOIs
StatePublished - Dec 2007

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Venezuelan Equine Encephalitis Viruses
Venezuelan equine encephalitis virus
Capsid Proteins
coat proteins
Alphavirus
cytopathogenicity
capsid
transcription (genetics)
Capsid
peptides
Peptides
Western Equine Encephalitis Viruses
Eastern equine encephalitis virus
Down-Regulation
Western equine encephalitis virus
Sindbis virus
nucleoporins
Sindbis Virus
Nuclear Pore
Central America

ASJC Scopus subject areas

  • Immunology

Cite this

Analysis of Venezuelan equine encephalitis virus capsid protein function in the inhibition of cellular transcription. / Garmashova, Natalia; Atasheva, Svetlana; Kang, Wenli; Weaver, Scott; Frolova, Elena; Frolov, Ilya.

In: Journal of Virology, Vol. 81, No. 24, 12.2007, p. 13552-13565.

Research output: Contribution to journalArticle

Garmashova, Natalia ; Atasheva, Svetlana ; Kang, Wenli ; Weaver, Scott ; Frolova, Elena ; Frolov, Ilya. / Analysis of Venezuelan equine encephalitis virus capsid protein function in the inhibition of cellular transcription. In: Journal of Virology. 2007 ; Vol. 81, No. 24. pp. 13552-13565.
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