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- W2019292413 abstract "Virulence proteins VirD1 and VirD2 are subunits of a relaxosome-like protein complex that mediates conjugational transfer of a Ti plasmid segment, the T-DNA, from Agrobacterium into higher plants. The VirD1-VirD2 complex binds to 25-bp repeats at the borders of the T-DNA and catalyzes sequence-specific nicking of the conjugative DNA strand (the T-strand) at the third base of these repeats. Nuclear localization signals present in VirD2 target the T-strand to plant cell nuclei. In addition, VirD2 probably plays a role in the high-frequency integration of the T-DNA into the plant genome by illegitimate recombination. Whereas Agrobacterium transformation of dicots is very efficient, T-DNA integration in most monocots can barely be detected. To develop an artificial T-DNA delivery system for monocots, a technique for efficient in vitro production of T-strand DNAs was established by using VirD1 and VirD2 proteins purified from overexpressing Escherichia coli strains. The topoisomerase-like VirD2 enzyme was shown to mediate precise, sequence-specific cleavage of T-DNA border sequences carried by single-stranded DNA templates, even in the absence of VirD1 protein. During this reaction, VirD2 remains covalently bound to the 5' end of artificial T-strand DNAs. In contrast, VirD2, alone or in complex with VirD1, fails to nick linear double-stranded DNA templates in vitro." @default.
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- W2019292413 title "Agrobacterium T-strand production in vitro: sequence-specific cleavage and 5' protection of single-stranded DNA templates by purified VirD2 protein." @default.
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- W2019292413 doi "https://doi.org/10.1073/pnas.91.2.694" @default.
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