Journal: Cell Reports

Article Title: Dynamics of the Eukaryotic Replicative Helicase at Lagging-Strand Protein Barriers Support the Steric Exclusion Model

doi: 10.1016/j.celrep.2019.01.086

Figure Lengend Snippet: Single-Molecule Detection of CMG Pausing at a Lagging-Strand Methyltransferase Block (A) Schematic representation of experimental approach used in single-molecule DNA unwinding assays. (B) Images of a sample field of view showing accumulation of EGFP-RPA fluorescence signal at different time points from the addition of EGFP-RPA into the chamber. (C) Example unwinding traces of DNA substrates without a protein barrier. Traces exhibit a signal drop upon completion of unwinding due to dissociation of the leading-strand template (depicted in A). (D) Distribution of average fork rates measured in fully unwound substrates without MH (black) and after bypassing MH Lag (blue). Number of molecules are n(-MH) = 199, n(MH Lag after pause) = 20. (E) Sample unwinding traces of DNA substrates modified with MH Lag . Pausing observed at 800 bp is highlighted with gray rectangle. (F) Distribution of pause durations observed in molecules exhibiting a pausing event (n = 109). The solid line is a fit to a single exponential. See also Figure S6 .

Article Snippet: 5FdC-modified fork templates were mixed with HpaII methyltransferase (M.HpaII) in 1:4 DNA to protein molar ratio in methyltransferase buffer (50 mM Tris-HCl, pH 7.5, 0.5 mM 2-mercaptoethanol (β-ME), 10 mM EDTA, NEB) supplemented with 100 μM S-adenosylmethionine (NEB), and incubated at 37°C for 3 hours.

Techniques: Blocking Assay, Fluorescence, Modification

Journal: Cell Reports

Article Title: Dynamics of the Eukaryotic Replicative Helicase at Lagging-Strand Protein Barriers Support the Steric Exclusion Model

doi: 10.1016/j.celrep.2019.01.086

Figure Lengend Snippet:

Article Snippet: 5FdC-modified fork templates were mixed with HpaII methyltransferase (M.HpaII) in 1:4 DNA to protein molar ratio in methyltransferase buffer (50 mM Tris-HCl, pH 7.5, 0.5 mM 2-mercaptoethanol (β-ME), 10 mM EDTA, NEB) supplemented with 100 μM S-adenosylmethionine (NEB), and incubated at 37°C for 3 hours.

Techniques: Recombinant, Gel Extraction, Purification, Plasmid Preparation, Software