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Real-time detection of polymerase activity using supercritical angle fluorescence
Alexander Krieg1, Thomas Ruckstuhl, Stephan Laib
1Physikalisch-Chemisches Institut, Universität Zürich, Winterthurerstr. 190, 8057 Zürich, Switzerland.
Journal of Fluorescence
|December 30, 2004
Summary
Researchers studied fluorescently labeled nucleotides (dNTPs) incorporation by polymerases. The Cy5-dCTP-Klenow enzyme system showed the highest incorporation efficiency during DNA synthesis, confirmed by real-time biosensor analysis.
Area of Science:
- Biochemistry
- Molecular Biology
- Biotechnology
Background:
- Fluorescently labeled nucleotides (dNTPs) are crucial for various molecular biology applications, including DNA sequencing and diagnostics.
- Efficient and accurate incorporation of these labeled dNTPs by DNA polymerases is essential for reliable experimental outcomes.
- Real-time monitoring of nucleotide incorporation can provide valuable insights into polymerase kinetics and efficiency.
Purpose of the Study:
- To investigate and compare the incorporation efficiencies of different fluorescently labeled dNTPs by various DNA polymerases.
- To identify the optimal combination of a fluorescently labeled dCTP and a polymerase for efficient complementary strand DNA synthesis.
- To establish a real-time method for assessing nucleotide incorporation using a biosensor.
Main Methods:
- Immobilization of single-stranded DNA (ssDNA) onto a coverslip surface.
- Real-time monitoring of fluorescence increase using a supercritical angle fluorescence (SAF) biosensor during complementary strand synthesis.
- Quantification of fluorescence signal intensity to determine incorporation yields of different fluorescently labeled dNTPs and polymerase systems.
Main Results:
- Different fluorescently labeled dNTPs exhibited varying incorporation efficiencies with tested polymerases.
- The Klenow fragment (exonuclease-free) in combination with Cy5-dCTP demonstrated superior incorporation yield compared to other tested systems.
- Real-time SAF biosensor measurements allowed for direct comparison of incorporation efficiencies.
Conclusions:
- The Cy5-dCTP and Klenow (exonuclease-free) polymerase system is highly efficient for complementary DNA strand synthesis.
- This finding has implications for optimizing labeling strategies in molecular diagnostics and sequencing technologies.
- The developed real-time biosensor approach provides a robust method for evaluating nucleotide incorporation efficiency.