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Restriction Endonucleases >
Restriction Endonucleases >
ApaI |
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Prices are in US dollars and valid only for US orders.
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Recognition Site:
isoschizomers | compatible ends | single letter code
Source:
A E. coli strain that carries the ApaI gene from Acetobacter pasteurianus sub. pasteurianus (ATCC 9432).
Reagents Supplied:
NEBuffer 4 (10X)
BSA (100X)
Enzyme Properties
Activity in NEBuffers:
| NEBuffer 1: | | 25% | | NEBuffer 2: | | 50% | | NEBuffer 3: | | 0% | | NEBuffer 4: | | 100% |
When using a buffer other than the optimal (supplied) NEBuffer, it may be necessary to add more enzyme to achieve complete digestion.
Methylation Sensitivity:
| dam methylation: Not sensitive | | dcm methylation: Blocked by overlapping | | CpG methylation: Blocked by overlapping | |
More information about: Methylation Sensitivity |
Activity at 37°C:
100%
Heat Inactivation:
65°C for 20 minutes
Survival in a Reaction:
(+ + +) Suitable for an extended or overnight digestion. Enzyme is active > 8 hours.
More information about: Extended Digests with Restriction Enzymes
Reaction & Storage Conditions
Reaction Conditions:
1X NEBuffer 4
Supplemented with 100 μg/ml Bovine Serum Albumin
Incubate at
25°C.
1X NEBuffer 4:
20 mM Tris-acetate
50 mM potassium acetate
10 mM Magnesium Acetate
1 mM Dithiothreitol
pH 7.9 @ 25°C
Unit Definition:
One unit is defined as the amount of enzyme required to digest 1 µg of Adenovirus-2 DNA in 1 hour at 25°C in a total reaction volume of 50 µl.
Concentration:
50,000 units/ml
Unit Assay Substrate:
Adenovirus-2 DNA
Storage Conditions:
10 mM Tris-HCl
50 mM KCl
1 mM Dithiothreitol
0.1 mM EDTA
500 µg/ml BSA
50% Glycerol
pH 7.4 @ 25°C
Storage Temperature:
-20°C
Diluent Compatibility:
Diluent A
Notes
General notes:- ApaI is an isoschizomer of Bsp120 I, but yields a 3´ extension.
Usage notes:- Incubation at 37°C results in 100% activity, however, the half-life of ApaI at 37°C is only 30 minutes.
- ApaI is inhibited by salt concentrations above 50 mM.
Quality Control for Current Lot
Quality control values for a specific lot can be found on the datacard which accompanies each product.
Ligation and Re-cutting:
After a 10-fold overdigestion with ApaI, > 95%
of the DNA fragments can be ligated with T4 DNA Ligase (at a 5' termini concentration of 1-2 μM)
at 16ºC. Of these ligated fragments, > 95% can be recut with ApaI.
16-Hour Incubation:
A 50 μl reaction containing 1 μg of DNA
and 100 units of ApaI incubated for 16 hours at 25ºC
resulted in a DNA pattern free of detectable nuclease degradation as determined by agarose gel electrophoresis.
Exonuclease Activity:
Incubation of a 50 μl reaction containing 100 units of ApaI with 1 μg of a mixture of single and double-stranded
[3H] E. coli DNA (205 cpm/μg) for 4 hours at 25ºC
released < 0.1% of the total radioactivity.
Endonuclease Activity:
Incubation of a 50 μl reaction containing 100 units of ApaI with 1 μg of
ΦX174 RF I DNA for 4 hours at 25ºC resulted
in < 20% conversion to RFII as determined by agarose gel electrophoresis.
Blue/White Screening Assay:
An appropriate vector is digested at a unique site within the
lacZα gene with a 10-fold excess of enzyme.
The vector DNA is then ligated, transformed, and plated onto Xgal/IPTG/Amp plates.
Successful expression of β-galactosidase is a function of how intact its gene remains after cloning,
an intact gene gives rise to a blue colony, removal of even a single base gives rise to a white colony.
Enzyme preparations must produce fewer than 3% white colonies to be Blue/White certified.
Reagents Sold Separately
NEBuffer 4
BSA
Companion Products
dam-/dcm- Competent E. coli
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