Any which way you can: Nano-toolboxes for programmable self-assembly

by | Mar 22, 2013

Molecular self-assembly of multifunctional nanoparticle composites with arbitrary shapes and functions

They say that nothing worthwhile is ever easy. Biology gives the lie to that statement, however. Many of its most complex and useful structures, like ribosomes, are produced from one of the easiest processes of all, self-assembly. The trick, of course, is supplying the right building blocks.

DNA-based self assembly could be a powerful tool in nanotechnology. The template-matching hybridization reaction between DNA oligoneucleotides is capable of Turing-universal computation. In other words, anything that is computable can be computed by a DNA-based computer, which is exactly as powerful as any other computer. In this way, engineered systems of biological material could be programmed to build any structure or implement any computable function.

DNA-guided self assembly holds great promise for the programming of matter at a molecular scale: DNA has unique molecular recognition properties and is easy to manipulate. So when nucleotides are combined with appropriate building blocks, this sort of self-assembly could be used to build complex nano-architecture. The nucleotides instruct the building blocks on how to interact with eachother, but it is the shape and form of the building blocks that determine the final structure. To ensure true programmability of the nanosystem, the locations and orientations of the DNA oligonucleotides in the building blocks should be controlled and repeatable.

In a new review in the journal Particle & Particle Systems Characterization, Jin-Woo Kim and Russell Deaton discuss the challenges and strategies of programming the self-assembly of nanoparticles into complicated, anisotropic shapes. As they see it, the first fundamental challenge is the creation of a building block that can be used to build anisotropic nanostructures with diverse compositions and geometries. The second is to design both the structure and function of the nanostructures. By functionalizing DNA one at a time to the nanoparticle, a DNA nanoparticle building block could be designed with distinct DNA sequences at different locations on the particle surface.

By controlling form and function, you can find the right toolbox for every job.