Revision as of 07:53, 31 August 2013

Abstract

Recent years, the technology of DNA origami is attracting keen interest for the synthesis of various nanostructures. If we integrate movable structures in a DNA origami, various applications such as molecular detection devices, molecular motor devices, and drug delivery systems are expected. However, only a few examples of such a movable system have been reported so far. Other problem is that the synthesis of DNA origami in larger amount is not so easy. Hence, it is unrealistic to make the macroscopic-scale device which output or input macroscopic signalｓ such as a mechanical one, only by using DNA origamis. Therefore, in this study, we tried to fabricate the device in which an inorganic porous substrate is combined with DNA origami. We synthesize the DNA-origami-based “DNA weathercock” which has a shaft, a blade, and a fluorescence molecule. We then attach the weathercock onto an inorganic porous substrate (anodizing alumina) with regularly arranged perpendicular pores, so that the weathercock can freely rotate. We incorporate fluorescence quencher molecules on to a part of the substrate, so that the device emits fluorescence only when the liquid on the substrate flows along a specific direction.

Recently, DNA origami are attracting attentions. DNA-origami is the programmable nanostructure which is synthesized by weaving a very long single strand DNA with a large number of short single strand DNAs, just like the weft of the textile. While the technique originally allowed us to form flat nanostructures, we can recently fabricate complicated three-dimensional nanostructures with bent parts like a bird cage.

We integrate movable structures in a DNA origami. However, only a few examples of such a movable system have been reported so far. The synthesis of DNA origami in larger amount is not so easy, and there is a limit to the creation of only DNA origami the problem of size and shape. Unrealistic to make the macroscopic-scale device which output or input the macroscopic signal such as a mechanical and one only with DNA origami.

In this study, we tried to fabricate the device in which an inorganic porous substrate is combined with DNA origami. We synthesize the “DNA weathercock” which has a shaft, a blade, and a fluorescence molecule made of DNA origami. We then attach the weathercock onto the inorganic porous substrate (anodizing alumina) with regularly arranged perpendicular pores, so that the weathercock can freely rotate. We incorporate fluorescence quencher molecules on to a part of the substrate, so that the device emit fluorescence only when the liquid on the substrate flows along a specific direction.

Create a DNA origami of fluorescent molecules likened to weathercock, attach it to the hole of the anodizing alumina. Attach the fluorescent molecule to weathercock to detect fine flow as light. Also include the quencher molecule in a part of the anodizing alumina. How to install the quencher molecule is something to block the pores of the part in one direction by the DNA origami obtained by modifying a fluorescent molecule on a substrate, and incorporate the quencher molecule to it. Quencher molecule is mounted on hole of the substrate not blocked by the DNA origami. Weathercock of DNA with fluorescent molecules to free rotation on the substrate incorporated the quencher molecule. If there is a flow to the left as a, the flash fires because it is in a part without a quencher molecule is the tip of the DNA origami. If there is a flow to the right as b, does not flash because it is in a part quencher molecule is the tip of the DNA origami. This way, detect the flow.

We compared to design this shape. An enlarged view portion surrounded by a blue figure on the left is the figure on the right. Of irregular shape similar to DNA origami design was observed. The figure below is a cross-sectional view of a portion of the green line in the right figure. The size of the design is Length 28 nm, Side 20 nm and Height 17 nm. Cross-sectional view of the observed image is Length about 30 nm, Side about 21 nm, Height 2.3 nm. Diameter is almost the same but height is not match. It is seems to be because the base pairs of the DNA with each other are aggregated.

右に流れがある場合

左に流れがある場合

@@ Line 4: / Line 4: @@
 =Introduction=
 ==Background==
-*Recent, DNA origami attracts attention. We used the very long single strand DNA like the weft of the textile and formed double helix as the warp with a large number of single strand DNA which had a short it, and the technique that we tucked in in free flat surface nanostructure was a conventional method. Today, we put plural bent structure together and were able to build freely the complicated solid nanostructure which didn’t think conventional, huge structure like the bird cage. However, there are not so many things that DNA origami moved itself.
+*Recently, DNA origami are attracting attentions. DNA-origami is the programmable nanostructure which is synthesized by weaving a very long single strand DNA with a large number of short single strand DNAs, just like the weft of the textile. While the technique originally allowed us to form flat nanostructures, we can recently fabricate complicated three-dimensional nanostructures with bent parts like a bird cage.
 ==Problems==
 *We integrate movable structures in a DNA origami. However, only a few examples of such a movable system have been reported so far. The synthesis of DNA origami in larger amount is not so easy, and there is a limit to the creation of only DNA origami the problem of size and shape. Unrealistic to make the macroscopic-scale device which output or input the macroscopic signal such as a mechanical and one only with DNA origami.