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Virus-Cell Interactions

Identification of Six Autographa californica Multicapsid Nucleopolyhedrovirus Early Genes That Mediate Nuclear Localization of G-Actin

Taro Ohkawa, Annette R. Rowe, Loy E. Volkman
Taro Ohkawa
Department of Plant and Microbial Biology, University of California, Berkeley, California 94720-3102
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Annette R. Rowe
Department of Plant and Microbial Biology, University of California, Berkeley, California 94720-3102
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Loy E. Volkman
Department of Plant and Microbial Biology, University of California, Berkeley, California 94720-3102
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  • For correspondence: lvolkman@nature.berkeley.edu
DOI: 10.1128/JVI.76.23.12281-12289.2002
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ABSTRACT

Nuclear filamentous actin (F-actin) is required for nucleopolyhedrovirus (NPV) progeny production in NPV-infected, cultured lepidopteran cells. We have determined that monomeric G-actin is localized within the nuclei of host cells during the early stage of infection by Autographa californica multicapsid nucleopolyhedrovirus (AcMNPV). With a library of cloned AcMNPV genomic fragments, along with a plasmid engineered to express enhanced green fluorescent protein-Bombyx mori G-actin in transient transfection experiments, we identified six AcMNPV early genes that mediate nuclear localization of G-actin in TN-368 cells: ie-1, pe38, he65, Ac004, Ac102, and Ac152. Within this subset, ie-1 and pe38 encode immediate-early transcriptional transactivators, he65 encodes a delayed-early product, and the products encoded by Ac004, Ac102, and Ac152 have not been characterized. We found that when driven by foreign promoters, ie-1, pe38, and Ac004 had to be expressed prior to Ac102 or he65 for nuclear G-actin to accumulate and that expression of Ac152 was no longer required. These results and others suggested that the product of Ac152 was a transactivator (directly or indirectly) of both Ac102 and he65 and that recruitment of G-actin to the nucleus was a temporally regulated process. Determining the functions of each of the six AcMNPV gene products with respect to our assay should provide valuable clues to basic cellular mechanisms of actin regulation and how AcMNPV infection affects them.

  • Copyright © 2002 American Society for Microbiology
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Identification of Six Autographa californica Multicapsid Nucleopolyhedrovirus Early Genes That Mediate Nuclear Localization of G-Actin
Taro Ohkawa, Annette R. Rowe, Loy E. Volkman
Journal of Virology Dec 2002, 76 (23) 12281-12289; DOI: 10.1128/JVI.76.23.12281-12289.2002

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Identification of Six Autographa californica Multicapsid Nucleopolyhedrovirus Early Genes That Mediate Nuclear Localization of G-Actin
Taro Ohkawa, Annette R. Rowe, Loy E. Volkman
Journal of Virology Dec 2002, 76 (23) 12281-12289; DOI: 10.1128/JVI.76.23.12281-12289.2002
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KEYWORDS

Actins
Cell Nucleus
Genes, Viral
Nucleopolyhedrovirus

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