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- W2524853669 abstract "Abstract Replicative helicases load onto DNA at the start of replication, and play a vital role by driving the replication fork forward. These helicases assemble into closed multimeric rings that need to encircle single-stranded (ss)DNA to be activated. Though helicase loading on substrates with accessible free ends has been well characterized for the T7 gp4 helicase, a model system for superfamily IV replicative helicases, the physiologically more relevant loading onto exposed ssDNA without free ends remains less well understood. Here, using a label-free assay that exploits changes in the DNA hairpin hopping dynamics to detect gp4 binding and activity, we characterize loading and activation of gp4 on exposed ssDNA without free ends, and find clear evidence of stepwise assembly of the helicase at the fork at physiologically relevant concentrations. The gradual loading onto ssDNA, rather than pre-forming in solution followed by spontaneous ring opening which appears favored at higher concentrations, suggests a new paradigm of stepwise assembly for the helicases in superfamily IV that do not require a separate loading enzyme." @default.
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- W2524853669 date "2016-09-27" @default.
- W2524853669 modified "2023-10-14" @default.
- W2524853669 title "Real-time observation of replicative helicase assembly onto single-stranded DNA" @default.
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- W2524853669 doi "https://doi.org/10.1101/077800" @default.
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