Characterization of a thermostable UvrD helicase and its participation in helicase-dependent amplification
| Autor: | Hyun-Jin Kim, Lixin An, Tamara A. Ranalli, Huimin Kong, Jamie Wytiaz, Wen Tang |
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| Rok vydání: | 2005 |
| Předmět: |
Hot Temperature
Time Factors DNA polymerase DNA Single-Stranded Thermoanaerobacter DNA-Directed DNA Polymerase Biochemistry Article chemistry.chemical_compound MutL Proteins Escherichia coli Cloning Molecular Molecular Biology Helicase-dependent amplification Klenow fragment Adenosine Triphosphatases biology Dose-Response Relationship Drug Escherichia coli Proteins DNA Helicases Temperature Helicase Cell Biology DNA DNA Polymerase I RNA Helicase A chemistry biology.protein Nucleic Acid Conformation Electrophoresis Polyacrylamide Gel DNA polymerase I Genome Bacterial Plasmids Protein Binding |
| Zdroj: | The Journal of biological chemistry. 280(32) |
| ISSN: | 0021-9258 |
| Popis: | Helicase-dependent amplification (HDA) is an isothermal in vitro DNA amplification method based upon the coordinated actions of helicases to separate double-stranded DNA and DNA polymerases to synthesize DNA. Previously, a mesophilic form of HDA (mHDA) utilizing the Escherichia coli UvrD helicase, DNA polymerase I Klenow fragment, two accessory proteins, MutL and single-stranded DNA-binding protein (SSB), was developed (1). In an effort to improve the specificity and performance of HDA, we have cloned and purified a thermostable UvrD helicase (Tte-UvrD) and the mutL homolog (Tte-MutL) from Thermoanaerobacter tengcongensis. Characterization of the Tte-UvrD helicase shows that it is stable and active from 45 to 65 degrees C. We have found that the Tte-UvrD helicase unwinds blunt-ended DNA duplexes as well as substrates possessing 3'- or 5'-ssDNA tails. Tte-UvrD was used to develop athermophilichelicase-dependent amplification (tHDA) system to selectively amplify target sequences at 60-65 degrees C. The tHDA system is more efficient than mHDA, displaying heightened amplification sensitivity without the need for the MutL and SSB accessory proteins. Amplification independent of MutL corresponds with studies demonstrating that maximal Tte-UvrD helicase activity does not require the mutL homolog. The tHDA system allows for rapid amplification and detection of targets present in genomic DNA. The expeditious nature and simplistic design of the tHDA platform makes the technology ideal for use in diagnostic applications requiring rapid identification of organisms at the point-of-need. |
| Databáze: | OpenAIRE |
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