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Radioprotective effects produced by the condensation of plasmid DNA with avidin and biotinylated gold nanoparticles

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Abstract

The treatment of aqueous solutions of plasmid DNA with the protein avidin results in significant changes in physical, chemical, and biochemical properties. These effects include increased light scattering, formation of micron-sized particles containing both DNA and protein, and plasmid protection against thermal denaturation, radical attack, and nuclease digestion. All of these changes are consistent with condensation of the plasmid by avidin. Avidin can be displaced from the plasmid at higher ionic strengths. Avidin is not displaced from the plasmid by an excess of a tetra-arginine ligand, nor by the presence of biotin. Therefore, this system offers the opportunity to reversibly bind biotin-labeled species to a condensed DNA–protein complex. An example application is the use of biotinylated gold nanoparticles. This system offers the ability to examine in better detail the chemical mechanisms involved in important radiobiological effects. Examples include protein modulation of radiation damage to DNA, and radiosensitization by gold nanoparticles

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Acknowledgments

Supported by PHS grant CA46295. The authors thank Dr. Jonathan Neidigh for assistance with circular dichroic spectroscopy.

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Authors and Affiliations

  1. Department of Biochemistry, Loma Linda University, 11085 Campus Street, Loma Linda, CA, 92350, USA

    Christopher C. Perry

  2. Department of Radiology, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0610, USA

    Sarah M. Urata, Melissa Lee, Joe A. Aguilera & Jamie R. Milligan

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  1. Christopher C. Perry
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  2. Sarah M. Urata
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  4. Joe A. Aguilera
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Correspondence to Jamie R. Milligan.

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Perry, C.C., Urata, S.M., Lee, M. et al. Radioprotective effects produced by the condensation of plasmid DNA with avidin and biotinylated gold nanoparticles. Radiat Environ Biophys 51, 457–468 (2012). https://doi.org/10.1007/s00411-012-0429-6

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  • DOI: https://doi.org/10.1007/s00411-012-0429-6

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