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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

DNA origami : a substrate for the study of molecular motors

Wickham, Shelley January 2011 (has links)
DNA origami is a method for constructing 2-dimensional nanostructures with arbitrary shapes, by folding a long piece of viral genomic DNA into an extended pattern (Rothemund, 2006). In this thesis DNA origami nanostructures that in- corporate active transport are developed, by combining rectangular DNA origami tiles with either synthetic DNA motors, or the protein motor F1-ATPase. The transport of an autonomous, unidirectional, and processive 'burnt-bridges' DNA motor across an extended linear track anchored to a DNA origami tile is demonstrated. Ensemble fluorescence measurements are used to characterise motor transport, and are compared to a simple deterministic model of stepping. The motor moves 100 nm along a track at 0.1 nms-1 Atomic force microscopy (AFM) is used to study the transport of individual motor molecules along the track with single-step resolution. A DNA origami track for a 'two-foot' DNA motor is also developed, and is characterised by AFM and ensemble fluorescence measurements. The burnt-bridges DNA motor is then directed through a track network with either 1 or 3 bifurcations. Ensemble fluorescence measurements demonstrate that the path taken can be controlled by the addition of external control strands, or pre-programmed into the motor. A method for attaching the rotary motor protein F1-ATPase to DNA origami tiles is developed. Different bulk and single-molecule methods for demonstrat- ing protein binding are explored. Single-molecule observations of rotation of the protein motor on a DNA origami substrate are made, and are of equivalent data quality to existing techniques.

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