DNA teria se formado espontaneamente

quarta-feira, abril 08, 2015

Abiotic ligation of DNA oligomers templated by their liquid crystal ordering

Tommaso P. Fraccia, Gregory P. Smith, Giuliano Zanchetta, Elvezia Paraboschi, Yougwooo Yi, David M. Walba, Giorgio Dieci, Noel A. Clark & Tommaso Bellini

Affiliations Contributions Corresponding author

Nature Communications 6, Article number: 6424 doi:10.1038/ncomms7424

Received 20 November 2014 Accepted 28 January 2015 Published 10 March 2015

Credit: Noel Clark, University of Colorado


Abstract• Introduction• Results• Discussion• Methods• Additional information• References• Acknowledgements• Author information• Supplementary information

It has been observed that concentrated solutions of short DNA oligomers develop liquid crystal ordering as the result of a hierarchically structured supramolecular self-assembly. In mixtures of oligomers with various degree of complementarity, liquid crystal microdomains are formed via the selective aggregation of those oligomers that have a sufficient degree of duplexing and propensity for physical polymerization. Here we show that such domains act as fluid and permeable microreactors in which the order-stabilized molecular contacts between duplex terminals serve as physical templates for their chemical ligation. In the presence of abiotic condensing agents, liquid crystal ordering markedly enhances ligation efficacy, thereby enhancing its own phase stability. The coupling between order-templated ligation and selectivity provided by supramolecular ordering enables an autocatalytic cycle favouring the growth of DNA chains, up to biologically relevant lengths, from few-base long oligomers. This finding suggests a novel scenario for the abiotic origin of nucleic acids.

Subject terms: Biological sciences Biochemistry Biotechnology Materials science

FREE PDF GRATIS: Nature Communications