HinfI
(Haemophilus influenzae Rf)
5’-G A N T C-3’
3’-C T N A G-5’
Reaction Temperature: 37°C
Prototype: HinfI
Inactivation Temperature (20 min): 80°C
Reaction Buffer:
1x Medium Buffer: 10 mM Tris-HCl (pH 7.5 at 37°C), 10 mM MgCl2, 50 mM NaCl, 1 mM dithiothreitol, 100 µg/ml bovine serum albumin.
Unit Definition: One unit is the amount of enzyme required to completely digest 1 µg of lambda DNA in 1 hr in a total reaction volume of 50 μl.
Assay Conditions: 10 mM Tris-HCl (pH 7.5 at 37°C), 50 mM NaCl, 10 mM MgCl2, 1 mM dithiothreitol, 100 µg/ml bovine serum albumin and 1μg of lambda DNA. Incubation is at 37°C for 1 hr in a reaction volume of 50 µl.
Storage Buffer: 10 mM Tris-HCl (pH 7.5 at 22°C), 50 mM KCl, 0.1 mM EDTA, 1 mM dithiothreitol, 100 μg/ml bovine serum albumin and 50% glycerol.
Storage Conditions: Store at –20°C.
Quality Control:
Non-specyfic Endonucleases: Incubation of 20 units of HinfI with 1 µg of lambda DNA at 37°C for 16 hrs (a 320-fold over-digestion) resulted in the same sharp characteristic banding pattern as the standard assay reaction, as determined by agarose gel electrophoresis.
3’-Exonuclease: 16, 31 and 62 unit of HinfI and 0.10 µg (0.82 pmol of 3’-ends) of lambda/TaqI fragments (3’-labeled with T4 DNA Polymerase and [³H]dGTP and [³H]dCTP), incubated for 1 hr at 37°C resulted in 0.13-slope of %-end label released per unit of enzyme. Reaction volume 10 µl.
5’-Exonuclease/5’-Phosphatase: Incubation of 16, 31 and 62 unit of HinfI with 0.04 µg (0.28 pmol of 5’-ends) of [5’-³²P] lambda/HaeIII fragments for 1 hr at 37°C resulted in 0.02-slope of %-end label released per unit of enzyme. Reaction volume 10 µl.