title: Enzymatically amplified surface plasmon resonance imaging detection of DNA by exonuclease III digestion of DNA microarrays.
abstract: This paper describes a novel approach utilizing the enzyme exonuclease III in conjunction with 3'-terminated DNA microarrays for the amplified detection of single-stranded DNA (ssDNA) with surface plasmon resonance (SPR) imaging. When ExoIII and target DNA are simultaneously introduced to a 3'-terminated ssDNA microarray, hybridization adsorption of the target ssDNA leads to the direction-dependent ExoIII hydrolysis of probe ssDNA strands and the release of the intact target ssDNA back into the solution. Readsorption of the target ssDNA to another probe creates a repeated hydrolysis process that results over time in a significant negative change in SPR imaging signal. Experiments are presented that demonstrate the direction-dependent surface enzyme reaction of ExoIII with double-stranded DNA as well as this new enzymatically amplified SPR imaging process with a 16-mer target ssDNA detection limit of 10-100 pM. This is a 10(2)-10(3) improvement on previously reported measurements of SPR imaging detection of ssDNA based solely on hybridization adsorption without enzymatic amplification.
authors.affiliation: Department of Chemistry, University of California-Irvine, Irvine, CA 92697, USA.
authors.forename: Hye Jin
authors.initials: HJ
authors.lastname: Lee
authors.forename: Yuan
authors.initials: Y
authors.lastname: Li
authors.forename: Alastair W
authors.initials: AW
authors.lastname: Wark
authors.forename: Robert M
authors.initials: RM
authors.lastname: Corn
mesh_terms: D004247:DNA / Q000032:analysis* / Q000378:metabolism*; D005090:Exodeoxyribonucleases / Q000378:metabolism*; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D004247:DNA; D005090:Exodeoxyribonucleases; C020133:exodeoxyribonuclease III