Published online by Cambridge University Press: 15 February 2011
DNA is a tractable medium for controlling the structure of matter on the nanometer scale. We have explored ligating together stable branched DNA molecules to form geometrical objects. By this means, we have assembled a 3-connected molecule whose helix axes have the connectivity of a cube. The construct is a hexacatenane, each of whose cyclic strands corresponds to a face of the object. Each of its twelve edges contains a unique recognition site for cleavage by a restriction enzyme; these sites are used to demonstrate the assembly of the object. The plectonemic structure of DNA also permits the directed synthesis of molecular knots. Recently, we have constructed trefoil knots from B-DNA and an amphichiral figure-8 knot whose helical domains contain both B-DNA and Z-DNA.
We have developed a solid-support methodology for the synthesis of geometrical objects. This approach provides greater control over products and topological purity, and lends itself better to automation. Branched molecules containing 3–6 double helical arms can be formed from equimolar mixtures of their component strands, thereby enabling the construction of 3–6 connected networks. The goals of this work include the construction of periodic multiply-connected networks of DNA. The aims of these DNA constructions include using them as scaffolding to build periodic macromolecular arrays for diffraction purposes, as well as directing the assembly of molecular electronic devices. There are wellcharacterized molecular transformations of DNA that make nano-scale machines feasible to build in this molecular context. These materials are likely to be useful for understanding crystallization processes and structure-function relationships.
To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Dropbox account. Find out more about saving content to Dropbox.
To save this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Google Drive account. Find out more about saving content to Google Drive.