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Tth DNA Ligase (250 U)
Cat. No. / ID: EN13-025
50 μL of T4 DNA Ligase 5 U/μL,125 μL of 10x Tth Ligation Buffer
Storage temperature: Keep at -20°C. Up to 20 thaw cycles will not compromise 10x Tth Ligation Buffer performance.
Quantity
250 U
2500 U
5000 U
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The Tth DNA Ligase is intended for molecular biology applications. This product is neither intended for the diagnosis, prevention or treatment of a disease, nor has it been validated for such use either alone or in combination with other products.
Need bulk, customized or optimized products for commercial purposes? We also offer support with logistics, compliance and more. Reach out to cooperate with QIAGEN Strategic Partnerships & OEM
Features
- Exhibits high thermostability that allows ligation using high-stringency hybridization conditions
- Possesses high specificity and stringency that permit the sensitive detection of SNPs
Product Details
Tth DNA Ligase catalyzes the NAD-dependent formation of phosphodiester bonds between adjacent 3’-hydroxyl and 5’-phosphate termini in double-stranded DNA. It is not active against single-stranded DNA or RNA and blunt-ended DNA. The enzyme is isolated from the Escherichia coli strain containing a plasmid carrying the Thermus thermophilus DNA ligase gene.
It is supplied with 50 mM Tris-HCl (pH 7.5), 100 mM NaCl, 0.1 mM EDTA, 0.1% Triton X-100, 1 mM DTT, 50% glycerol.
One unit of Tth DNA Ligase catalyzes the ligation of 50% of the cos sites present in 1 μg of bacteriophage lambda DNA in 1 minute at 45°C. One unit of Tth DNA Ligaseiq equivalent to 15 cohesive end units (CEU).
Performance
| Assay | Specification |
| Ligase activity | Passed |
| DNase contamination | None detected |
| Exonuclease activity | None detected |
| Endonuclease activity | None detected |
Principle
Tth DNA Ligase is stable and active in an optimum ligation temperature range of 45–65°C, which is 7–10°C higher than T4 DNA ligase. The Tm of the substrates determines the final reaction ligation temperature. High ligation temperature eliminates nonspecific ligation.
Procedure
Quality Control
Tth DNA ligase activity is assayed in a reaction containing 1 µg of bacteriophage lambda DNA digested with SalI and SmaI (Control DNA), 1x Tth Ligation Buffer and varying amounts of enzyme for 100 minutes at 450°C. Results are assayed by agarose gel electrophoresis. The product is free of unspecific DNA nucleases. Results are assayed by agarose gel electrophoresis following incubation of 1 µg of DNA substrate with 5 U of Tth ligase enzyme for 4 hours at 700°C.
Applications
This is used for applications such as:
- Ligase Chain Reaction (LCR)
- Ligase Detection Reaction (LDR)
- Next-Generation DNA Sequencing (NGS)
- Repeat Expansion Detection (RED)
- Rolling Circle Amplification (RCA)
- Proximity Ligation Assay (PLA)
Resources
Quick-Start Protocols (1)
Safety Data Sheets (1)
Certificates of Analysis (1)