All the creatures on Earth are made of cells. The exterior and the interior of the cell are compartmentalized by biomembranes. A nanodevice that is able to actively transport only the specific oligonucleotide through the biomembrane has a great potential to deliver siRNA into the cell or to extract mRNA expressed in the cell. Here, we decided to create a novel device with such a function. We have designed a cylindrical injector/extractor device made of DNA origami. Inside the cylinder, a cascade of single stranded DNAs is planted. Once the outer-most ssDNA binds to a target oligonucleotide, the target is passed to the inner-ones one by one because of the higher bonding energy assigned to the inner ones. We also investigate how the cylinder penetrates the biomembrane by using liposome as a model membrane.
Porter: Single stranded DNA. Once the outer-most ssDNA binds to a target, the target is passed to the inner-ones one by one. Gate: Cylindrical structure connecting the inside and outside like gates. A cascade of the "Selector" is planted in this. We can use this as an injector or extractor. Membrane: The exterior and the interior of the cell are compartmentalized by biomembranes. We use liposome as a model membrane.