Thermo Scientific DNA/RNA modifying enzymes are supplied with optimized reaction buffers.

However, it is often convenient to use these enzymes in other buffers for experiments that involve multiple enzymatic reactions. The table below lists activities of DNA/RNA modifying enzymes in common reaction buffers, supplied with Thermo Scientific Molecular Biology enzymes and used in common applications.

DNA/RNA modifying enzyme
Enzyme activity in 1X buffers, %
FastDigest (Green), Tango 1X and
Tango 2X
B
G
O
R
BamHI
Ecl136II, SacI
EcoRI
KpnI
Taq with KCl
Taq with (NH4)2SO4
Pfu
RT
T4 DNA Ligase
T4 DNA Ligase *
75-100 100 100 75-
100
75-
100
75-
100
50 75-
100
100 75 75 75 75 100
FastAP Thermosensitive Alkaline Phosphatase
100 100 100 100 100 100 100 100 100 100 50 75-
100
100 nd
T4 Polynucleotide Kinase (T4 PNK) **
100 75-
100
100 100 75-
100
100 50-75 100 75-
100
100 0 0 100 100
DNA Polymerase I
100 25-50 75-
100
100 100 100 50-75 100 50-75 100 100 100 100 nd
Klenow Fragment
100 25-50 20-50 100 100 100 50-75 100 50-75 100 100 100 100 100
Klenow Fragment, exo-
100 25-50 25-50 100 100 100 50-75 100 75-
100
100 100 100 100 nd
T4 DNA Polymerase
100 75-
100
75-
100
100 100 100 100 100 100 50 100 50 100 100
T7 DNA Polymerase
100 75-
100
100 100 100 75-
100
75-100 100 100 nd nd nd nd nd
Exonuclease I nd nd nd nd nd nd nd nd nd 100 100 100 nd nd
Exonuclease III 0-25 (FastDigest (Green), Tango 2X)

25-50 (Tango 1X)
100 25-50 0-25 0-25 0-25 100 0-25 100 nd nd nd nd nd
Lambda Exonuclease
nd nd nd nd nd nd nd nd nd 50-75 50-75 50-
75
nd nd
phi29 DNA Polymerase
100 25-100 100 100 100 100 50-75 100 50-75 25-50 75-100 75-100 75-100 75-100
Bsm DNA Polymerase
100 25-50 75-100 100 100 100 0-25 100 25-50 100 100 75-100 100 50-75

* Buffers were supplemented with 0.5 mM ATP, which is required for T4 DNA Ligase activity.
**The activity of this enzyme was compared to its activity in buffer A (for forward reaction).
nd – not determined.

1X Buffer Composition

B 10 mM Tris-HCl
(pH 7.5 at 37°C)
10 mM MgCl2
0.1 mg/mL BSA
G 10 mM Tris-HCl
(pH 7.5 at 37°C)
10 mM MgCl2 50 mM NaCl
0.1 mg/mL BSA
O
50 mM Tris-HCl
(pH 7.5 at 37°C)
10 mM MgCl2 100 mM NaCl
0.1 mg/mL BSA
R
10 mM Tris-HCl
(pH 8.5 at 37°C)
10 mM MgCl2 100 mM KCl
0.1 mg/mL BSA
Tango
33 mM Tris-acetate
(pH 7.9 at 37°C)
10 mM Mg-acetate
66 mM K-acetate
0.1 mg/mL BSA
BamHI
10 mM Tris-HCl
(pH 8.0 at 37°C)
5 mM MgCl2 100 mM KCl
0.02%
Triton X-100
0.1 mg/mL BSA 1 mM BME
Ecl136II,
SacI
10 mM Bis-Tris
Propane-HCl
(pH 6.5 at 37°C)
10 mM MgCl2 0.1 mg/mL BSA
EcoRI 50 mM Tris-HCl
(pH 7.5 at 37°C)
10 mM MgCl2 100 mM NaCl
0.02%
Triton X-100
0.1 mg/mL BSA
KpnI 10 mM Tris-HCl
(pH 7.5 at 37°C)
10 mM MgCl2 0.02%
Triton X-100
0.1 mg/mL BSA
Taq
with KCl
10 mM Tris-HCl
(pH 8.8 at 25°C)
1.5 mM MgCl2 50 mM KCl
0.08%
Nonidet P40
Taq with
(NH4)2SO4
75 mM Tris-HCl
(pH 8.8 at 25°C)
2 mM MgCl2 0.01%
Tween 20
20 mM (NH4)2SO4
T4 DNA Ligase

140 mM Tris-HCl
(pH 7.8 at 25°C)
10 mM MgCl2 0.5 mM ATP
10 mM DTT

DNA/RNA Modifying Enzyme Dilution

DNA/RNA modifying enzymes are supplied in their optimal storage buffers which are specially formulated for long term storage. If required for specific applications, dilute the enzyme with 1X reaction buffer for short term use.