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  • Title: RNA helicase activity of the plant virus movement proteins encoded by the first gene of the triple gene block.
    Author: Kalinina NO, Rakitina DV, Solovyev AG, Schiemann J, Morozov SY.
    Journal: Virology; 2002 May 10; 296(2):321-9. PubMed ID: 12069530.
    Abstract:
    Cell-to-cell and long-distance transport of some plant viruses requires coordinated action of three movement proteins encoded by triple gene block (TGB). The largest of TGB proteins, TGBp1, is a member of the superfamily I of DNA/RNA helicases and possesses a set of conserved helicase sequence motifs necessary for virus movement. A recombinant His-tagged form of TGBp1 of two hordeiviruses and potato virus X, a potexvirus, produced in Escherichia coli had unwinding activity on a partially duplexed RNA, but not DNA substrate. The helicase activity of these proteins was dependent on Mg2+ and ATP. The isolated C-terminal half of the PSLV TGBp1 retaining all helicase motifs was also able to unwind RNA duplex.
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