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• W2110304220 endingPage "2539" @default.
• W2110304220 startingPage "2531" @default.
• W2110304220 abstract "Open reading frame 45 (ORF45) of Kaposi's sarcoma-associated herpesvirus 8 (KSHV) is an immediate-early phosphorylated tegument protein and has been shown to play important roles at both early and late stages of viral infection. Homologues of ORF45 exist only in gammaherpesviruses, and their homology is limited. These homologues differ in their protein lengths and subcellular localizations. We and others have reported that KSHV ORF45 is localized predominantly in the cytoplasm, whereas its homologue in murine herpesvirus 68 is localized exclusively in the nucleus. We observed that ORF45s of rhesus rhadinovirus and herpesvirus saimiri are found exclusively in the nucleus. As a first step toward understanding the mechanism underlying the distinct intracellular distribution of KSHV ORF45, we identified the signals that control its subcellular localization. We found that KSHV ORF45 accumulated rapidly in the nucleus in the presence of leptomycin B, an inhibitor of CRM1 (exportin 1)-dependent nuclear export, suggesting that it could shuttle between the nucleus and cytoplasm. Mutational analysis revealed that KSHV ORF45 contains a CRM1-dependent, leucine-rich-like nuclear export signal and an adjacent nuclear localization signal. Replacement of the key residues with alanines in these motifs of ORF45 disrupts its shuttling between the cytoplasm and nucleus. The resulting ORF45 mutants have restricted subcellular localizations, being found exclusively either in the cytoplasm or in the nucleus. Recombinant viruses were reconstituted by introduction of these mutations into KSHV bacterial artificial chromosome BAC36. The resultant viruses have distinct phenotypes. A mutant virus in which ORF45 is restricted to the cytoplasm behaves as an ORF45-null mutant and produces 5- to 10-fold fewer progeny viruses than the wild type. In contrast, mutants in which the ORF45 protein is mostly restricted to the nucleus produce numbers of progeny viruses similar to those produced by the wild type. These data suggest that the subcellular localization signals of ORF45 have important functional roles in KSHV lytic replication." @default.
• W2110304220 created "2016-06-24" @default.
• W2110304220 creator A5013495602 @default.
• W2110304220 creator A5090590010 @default.
• W2110304220 date "2009-03-15" @default.
• W2110304220 modified "2023-10-18" @default.
• W2110304220 title "Identification of the Nuclear Export and Adjacent Nuclear Localization Signals for ORF45 of Kaposi's Sarcoma-Associated Herpesvirus" @default.
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• W2110304220 doi "https://doi.org/10.1128/jvi.02209-08" @default.
• W2110304220 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2648283" @default.
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