title: Quantifying quality in DNA self-assembly.
abstract: Molecular self-assembly with DNA is an attractive route for building nanoscale devices. The development of sophisticated and precise objects with this technique requires detailed experimental feedback on the structure and composition of assembled objects. Here we report a sensitive assay for the quality of assembly. The method relies on measuring the content of unpaired DNA bases in self-assembled DNA objects using a fluorescent de-Bruijn probe for three-base 'codons', which enables a comparison with the designed content of unpaired DNA. We use the assay to measure the quality of assembly of several multilayer DNA origami objects and illustrate the use of the assay for the rational refinement of assembly protocols. Our data suggests that large and complex objects like multilayer DNA origami can be made with high strand integration quality up to 99%. Beyond DNA nanotechnology, we speculate that the ability to discriminate unpaired from paired nucleic acids in the same macromolecule may also be useful for analysing cellular nucleic acids.
authors.affiliation: 1] Physik Department, Walter Schottky Institute, Technische Universität München, Am Coulombwall 4a, 85748 Garching, Germany [2].
authors.forename: Klaus F
authors.initials: KF
authors.lastname: Wagenbauer
authors.affiliation: 1] Physik Department, Walter Schottky Institute, Technische Universität München, Am Coulombwall 4a, 85748 Garching, Germany [2].
authors.forename: Christian H
authors.initials: CH
authors.lastname: Wachauf
authors.affiliation: Physik Department, Walter Schottky Institute, Technische Universität München, Am Coulombwall 4a, 85748 Garching, Germany.
authors.forename: Hendrik
authors.initials: H
authors.lastname: Dietz
mesh_terms: D020029:Base Pairing; D003062:Codon; D004247:DNA / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D009690:Nucleic Acid Conformation
chemical_list: D003062:Codon; D005456:Fluorescent Dyes; D004247:DNA
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