Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
Sauer, M; Angerer, B; Ankenbauer, W; Földes-Papp, Z; Göbel, F; Han, KT; Rigler, R; Schulz, A; Wolfrum, J; Zander, C.
Single molecule DNA sequencing in submicrometer channels: state of the art and future prospects.
J Biotechnol. 2001; 86(3): 181-201.
Doi: 10.1016/S0168-1656(00)00413-2
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- Co-Autor*innen der Med Uni Graz
- Földes-Papp Zeno
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- Abstract:
- We demonstrate a new method for single molecule DNA sequencing which is based upon detection and identification of single fluorescently labeled mononucleotide molecules degraded from DNA-strands in a cone shaped microcapillary with an inner diameter of 0.5 microm. The DNA was attached at an optical fiber via streptavidin/biotin binding and placed approximately 50 microm in front of the detection area inside of the microcapillary. The 5'-biotinylated 218-mer model DNA sequence used in the experiments contained 6 fluorescently labeled cytosine and uridine residues, respectively, at well defined positions. The negatively charged mononucleotide molecules were released by addition of exonuclease I and moved towards the detection area by electrokinetic forces. Adsorption of mononucleotide molecules onto the capillary walls as well as the electroosmotic (EOF) flow was prevented by the use of a 3% polyvinyl pyrrolidone (PVP) matrix containing 0.1% Tween 20. For efficient excitation of the labeled mononucleotide molecules a short-pulse diode laser emitting at 638 nm with a repetition rate of 57 MHz was applied. We report on experiments where single-stranded model DNA molecules each containing 6 fluorescently labeled dCTP and dUTP residues were attached at the tip of a fiber, transferred into the microcapillary and degraded by addition of exonuclease I solution. In one experiment, the exonucleolytic cleavage of 5-6 model DNA molecules was observed. 86 photon bursts were detected (43 Cy5-dCMP and 43 MR121-dUMP) during 400 s and identified due to the characteristic fluorescence decay time of the labels of 1.43+/-0.19 ns (Cy5-dCMP), and 2.35+/-0.29 ns (MR121-dUMP). The cleavage rate of exonuclease I on single-stranded labeled DNA molecules was determined to 3-24 Hz under the applied experimental conditions. In addition, the observed burst count rate (signals/s) indicates nonprocessive behavior of exonuclease I on single-stranded labeled DNA.
- Find related publications in this database (using NLM MeSH Indexing)
- Base Sequence -
- Chemistry, Analytical - instrumentation
- DNA - chemical synthesis
- Exodeoxyribonucleases - chemistry
- Fluorescent Dyes - analysis
- Forecasting - analysis
- Molecular Sequence Data - analysis
- Oligonucleotides - analysis
- Polymerase Chain Reaction - methods
- Sequence Analysis, DNA - instrumentation
- Find related publications in this database (Keywords)
- single-molecule DNA sequencing
- time-resolved fluorescence detection
- diode lasers
- submicrometer channels and electrophoresis