TCB Publications - Abstract

Kerstin Göpfrich, Chen-Yu Li, Maria Ricci, Satya Prathyusha Bhamidimarri, Jejoong Yoo, Bertalan Gyenes, Alexander Ohmann, Mathias Winterhalter, Aleksei Aksimentiev, and Ulrich F. Keyser. Large-conductance transmembrane porin made from DNA origami. ACS Nano, 10:8207-8214, 2016.

GOPF2016A-AA DNA nanotechnology allows for the creation of three-dimensional structures at nanometer scale. Here, we use DNA to build the largest synthetic pore in a lipid membrane to date, approaching the dimensions of the nuclear pore complex and increasing the pore-area and the conductance 10-fold compared to previous man-made channels. In our design, 19 cholesterol tags anchor a megadalton funnel-shaped DNA origami porin in a lipid bilayer membrane. Confocal imaging and ionic current recordings reveal spontaneous insertion of the DNA porin into the lipid membrane, creating a transmembrane pore of tens of nanosiemens conductance. All-atom molecular dynamics simulations characterize the conductance mechanism at the atomic level and independently confirm the DNA porins’ large ionic conductance.

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