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 (we named this device: CELL-GATE). 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.
Our PROJECT CELL-GATE is divided into three sub-projects:
PORTER: Composed of single stranded DNA (ssDNA) sequences. Each ssDNA is called Porter. Porters are designed to transfer target DNA strands into (or out from) the membrane. GATE: Cylindrical DNA nanostructure connecting the inside and outside of membrane like a channel. A cascade of the Porters is planted inside this cylinder. We can use this Gate as an injector or an extractor. MEMBRANE: The exterior and the interior of the cell are compartmentalized by biomembranes. We use liposome as a model membrane.