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Int. J. Mol. Sci. 2011, 12(10), 7238-7249; doi:10.3390/ijms12107238

Use of Oligonucleotides Carrying Photolabile Groups for the Control of the Deposition of Nanoparticles in Surfaces and Nanoparticle Association

1 Institute for Research in Biomedicine, Baldiri Reixac 10, Barcelona E-08028, Spain 2 Institute for Advanced Chemistry of Catalonia (IQAC), CSIC, CIBER-BBN Networking Centre on Bioengineering, Biomaterials and Nanomedicine, Jordi Girona 18-26, Barcelona E-08034, Spain
* Author to whom correspondence should be addressed.
Received: 10 October 2011 / Accepted: 18 October 2011 / Published: 24 October 2011
(This article belongs to the Section Material Sciences and Nanotechnology)
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An oligodeoxynucleotide hairpin containing a photolabile 2-nitrobenzyl group in the loop and terminated with a thiol function was prepared. The photocleavage of such a hairpin on gold yields a surface activated with a single stranded oligonucleotide which can be utilised to direct the assembly of nanoparticles conjugated with a complementary strand. Analysis of photocleaved surfaces gives nanoparticle coverage one order of magnitude higher than nonphotocleaved surfaces. This illustrates the ability of photocleavable hairpins to direct the assembly of nanomaterials on conducting materials. The conjugation of the photocleavable hairpin to a gold nanoparticle allows the observation of intermolecular interactions between hairpins linked in different nanoparticles, by comparing the thermal dissociations of a hairpin-nanoparticle conjugates at 260 nm and 520 nm. We have also shown that it is possible to permanently alter the physiochemical properties of DNA-nanoparticles by the introduction of a photocleavable group. Indeed for the first time it has been shown that by exposure to UV light the disassembly of nanoparticle aggregates can be induced.
Keywords: DNA; gold nanoparticles; photolysis DNA; gold nanoparticles; photolysis
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Manning, B.; Eritja, R. Use of Oligonucleotides Carrying Photolabile Groups for the Control of the Deposition of Nanoparticles in Surfaces and Nanoparticle Association. Int. J. Mol. Sci. 2011, 12, 7238-7249.

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