Figure 2. Sample configuration for SM DNA tightrope experiments.
(A) λ-DNA is extended across 5 µm beads using hydrodynamic flow. (B) Image of Qdot labeled glycosylase bound to DNA stretched between two beads. (C) Conjugation scheme for attachment of Qdot to glycosylase. A streptavidin-modified PEG coated QD is attached through biotin to an antibody that is specific for the 6-histidine tag on the C-terminus of the glycosylase (not to scale).