- Isolated from a recombinant source
- Thermostable ligase for incorporation of phosphorylated oligonucleotides during PCR and Ligase Chain Reaction
- Taq DNA Ligase is NOT a substitute for T4 DNA Ligase
- Supplied with 10X Reaction Buffer containing NAD+
Product SourcePurified from an E. coli strain containing the cloned ligase gene from Thermus aquaticus HB8 (1).
The following reagents are supplied with this product:
|Store at (°C)||Concentration|
|Taq DNA Ligase Reaction Buffer||-20*||10X|
|λ DNA-BstEII Digest||-20||500 μg/ml|
* Reagents' Storage Notes
- Taq DNA Ligase Reaction Buffer: For long term storage (>30 days), store at -20°C.
Advantages and Features
- Allele-specific gene detection using Ligase Detection Reaction and Ligase Chain Reaction (1,3).
- Mutagenesis by incorporation of a phosphorylated oligonucleotide during primer extension amplification (4).
Properties and Usage
Unit Definition(Cohesive End Unit)
One unit is defined as the amount of enzyme required to give 50% ligation of the 12-base pair cohesive ends of 1 µg of BstEII-digested λ DNA in a total reaction volume of 50 µl in 15 minutes at 45°C.
10 mM Tris-HCl
50 mM KCl
1 mM DTT
0.1 mM EDTA
200 μg/ml BSA
pH 7.4 @ 25°C
Unit Assay Conditions1X Taq DNA Ligase Reaction Buffer and DNA (20 µg/ml). After incubation at 45°C for 15 minutes, the reaction is terminated by addition of stop dye (50% glycerol, 50 mM EDTA and bromophenol blue), heated at 70°C for 10 minutes and then loaded on a 0.7% agarose gel. Due to the presence of ligase, the cos ends of BstEII-digested λ DNA will stay together after 70°C heat treatment.
Quality Assurance Statement
- Each lot is tested for contaminating single-stranded DNA exonuclease, endonuclease, ribonuclease and phosphatase activities.
Quality Control AssaysThe following Quality Control Tests are performed on each new lot and meet the specifications designated for the product. Individual lot data can be found on the Product Summary Sheet/Datacard or Manual which can be found in the Supporting Documents section of this page.
- Endonuclease Activity (Nicking):
The product is tested in a reaction containing a supercoiled DNA substrate. After incubation for 4 hours the percent converted to the nicked form is determined by agarose gel electrophoresis.
- Exonuclease Activity (Radioactivity Release):
The product is tested in a reaction containing a radiolabeled mixture of single and double-stranded DNA. After incubation for 4 hours the exonuclease activity is determined by the % release of radioactive nucleotides.
- Non-Specific DNase Activity (16 hour):
The product is tested for non-specific nuclease degradation in a reaction containing a DNA substrate. After incubation for 16 hours there is no detectable degradation of the DNA substrate as determined by agarose gel electrophoresis.
Research Use Only
- Taq DNA Ligase: Notice to Purchaser: This product is designed to ligate DNA fragments at temperatures requiring a thermoactive and thermostable enzyme. The seller is aware that the product may be used in the Ligase Chain Reaction™ (LCR™) process covered by one of more claims of a pending patent application or issued patent assigned to Cornell Research Foundation Inc., or Cornell Research Foundation, Inc. and the California Institute of Technology. LCR™ license inquires should be directed to Cornell Research Foundation, Inc.
- Reaction Conditions: Incubate DNA and enzyme in 1X Taq DNA Ligase Buffer at 45°C for 15 minutes or in a thermocycler with a program suited to the reaction described by Barany (1991) Genetic Disease Detection and DNA Amplification Using Cloned Thermostable Ligase. Proc. Natl. Acad. Sci. USA 88, 189-193. The reaction is stopped with a mixture of 50% glycerol, 50 mM EDTA, bromphenol blue."
- 1X Taq DNA Ligase Reaction Buffer requires NAD+ as a cofactor. NAD+ is supplied in the 10X Taq DNA Ligase Reaction Buffer; the buffer should be stored at -70°C to extend the half life of the NAD+ cofactor.
- Barany, F. (1991). Proc. Natl. Acad. Sci. USA. 88, 189-193.
- Takahashi, M. et al. (1984). J. Biol. Chem.. 259, 10041-10047.
- Barany, F. (1991). The Ligase Chain Reaction in a PCR World. 5-16.
- Michael, S.F. (1994). Biotechniques. 16, 411-412.
- Is Taq DNA Ligase used for a special technique?
- How much ligation occurs at mismatches when using Taq DNA Ligase?
- How many temperature cycles will Taq DNA Ligase survive?
- Can Taq DNA Ligase be used for cloning?
- What is the molecular weight of Taq DNA Ligase?
- What is the concentration of Taq DNA Ligase?
- Why is the Taq DNA Ligase buffer brown?
- Does Taq DNA Ligase require NAD?
- What is the activity of Taq DNA Ligase in other NEBuffers?
- What is the activity of Taq DNA Ligase at various temperatures?
- What is the stability of Taq DNA Ligase at 95°C?
- What is the stability of Taq DNA Ligase at room temperature?
- What is LCR and which enzymes do you recommend?
- What is LDR and how does it differ from LCR?
- How can I design probes for LDR or LCR to maximize specificity?