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Ampligase Thermostable DNA Ligase

Ampligase is provided with and without 10X reaction buffer and at both high and low concentrations . Please note that one unit of Ampligase is equal to as many as 15 units of other thermostable DNA ligases. Please compare competitive unit definitions carefully.

Ampligase Thermostable DNA Ligase

Highly thermostable DNA ligase for applications where ligation at high temperature is beneficial or required.
  • Highly thermostable DNA ligase for applications where ligation at high temperature is beneficial
  • High thermostability allows ligation using high-stringency hybridisation conditions
  • High specificity and stringency permits sensitive detection of SNPs
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Product information

Ampligase™ Thermostable DNA Ligase catalyses NAD-dependent ligation of adjacent 3´-hydroxylated and 5´-phosphorylated termini in duplex DNA structures that are stable at high temperatures. Derived from a thermophilic bacterium, the enzyme is stable and active at much higher temperatures than conventional DNA ligases. Its half-life is 48 hours at 65 °C and greater than 1 hour at 95 °C. Ampligase DNA Ligase has been shown to be active for at least 500 thermal cycles (94 °C / 80 °C) or 16 hours of cycling. 10 This exceptional thermostability permits extremely high hybridisation stringency and ligation specificity. Ampligase DNA Ligase has no detectable activity in ligating blunt-ended DNA and has no activity on RNA or RNA:DNA hybrids.


  • Ligation amplification (Ligase Chain Reaction, LCR) 1-7
  • Repeat Expansion Detection (RED) 7
  • Simultaneous mutagenesis of multiple sites 8,9
  • Other ligation-based detection methods


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  6. Nakazawa, H. et al. (1994) Proc. Natl. Acad. Sci. USA 91, 360.
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  8. Moore, D. and Michael, S. (1995) Epicentre Forum 2(4), 4.
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  10. Schalling, M. et al. (1993) Nature Genetics 4, 135.
  11. Hardenbol, P. et al. (2003) Nature Biotechnology 21, 673.

Unit Definition: One unit of Ampligase DNA Ligase catalyses the ligation of 50% of the cos sites in 1 µg of lambda DNA in 1 minute at 45 °C in 1X Ampligase Reaction Buffer.

Note: One unit of Ampligase DNA Ligase is equivalent to at least 15 of the "cohesive end units" or "nick ligation units" defined elsewhere. 4

Storage Buffer: 50% glycerol containing 50 mM Tris-HCl (pH 7.5), 0.1 M NaCl, 0.1 mM EDTA, 1 mM DTT, and 0.1% Triton® X-100.

Ampligase 10X Reaction Buffer: 200 mM Tris-HCl (pH 8.3), 250 mM KCl, 100 mM MgCl2, 5 mM NAD, and 0.1% Triton® X-100.

Quality Control: Ampligase Thermostable DNA Ligase is assayed for the absence of blunt-end ligation activity by ligating Sma I-digested bacteriophage lambda DNA at 45 °C; ligation occurs only at cos sites as determined by gel electrophoresis. Ampligase DNA Ligase is free of detectable exo- and endonuclease and RNase activities.

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