title: Gold nanoparticle based FRET assay for the detection of DNA cleavage.
abstract: We report gold nanoparticle based FRET assay to monitor the cleavage of DNA by nucleases. Fluorescence signal enhancement is observed by a factor of 120 after the cleavage reaction in the presence of S1 nuclease. The mechanism of distant dependent fluorescence quenching has been discussed. Our experimental results on distance dependent fluorescence quenching match quite well with theoretical findings obtained from the fluorescence quenching model by Gersten and Nitzan (Surf. Sci. 1985, 158, 165). Our experimental observation paradigm for the design of optical based molecular ruler strategies at distances more than double the distances achievable using traditional dipole-dipole Columbic energy transfer based methods.
authors.forename: Paresh Chandra
authors.initials: PC
authors.lastname: Ray
authors.forename: Angela
authors.initials: A
authors.lastname: Fortner
authors.forename: Gopala Krishna
authors.initials: GK
authors.lastname: Darbha
mesh_terms: D004247:DNA / Q000032:analysis* / Q000378:metabolism; D031541:Fluorescence Resonance Energy Transfer / Q000379:methods*; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D015719:Single-Strand Specific DNA and RNA Endonucleases / Q000378:metabolism; D013050:Spectrometry, Fluorescence / Q000379:methods
chemical_list: D006046:Gold; D004247:DNA; D015719:Single-Strand Specific DNA and RNA Endonucleases