Nanoplasmonic molecular ruler for nuclease activity and DNAfootprinting
We have constructed a nanoplasmonic molecular ruler, which can perform label-free and real-time monitoring of DNA length changes and perform DNA footprinting. The ruler was created by tethering double-stranded DNA to single Au nanoparticles. The scattering spectra of Au-DNA nanoconjugates showed red-shifted peak plasmon resonance wavelength dependent on DNA length, which can be measured with sub-nanometer axial resolution, averaging {approx}1.24 nm peak wavelength shift per DNA base pair. The spectra of individual Au-DNA nanoconjugates in the presence of nuclease showed a time-resolved dependence on the reaction dynamics, allowing quantitative, kinetic and real-time measurement of nuclease activity. The ruler was further developed into a new DNA footprinting platform. We showed the specific binding of a protein to DNA and the accurate mapping of its footprint. This work promises a very fast and convenient platform for mapping DNA-protein interactions, for nuclease activity monitoring, and for other DNA size-based methods.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director, Office of Science. Office of Biological andEnvironmental Research. Life Sciences Division
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 919256
- Report Number(s):
- LBNL-61485; R&D Project: L0350; BnR: 400403209; TRN: US0806334
- Journal Information:
- Nature Nanotechnology, Vol. 1, Issue 1; Related Information: Journal Publication Date: 10/2006
- Country of Publication:
- United States
- Language:
- English
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