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Restriction Endonucleases >
Restriction Endonucleases >
NcoI |  | | | | NcoI | | | NcoI has a High Fidelity (HF) Version available | Receive a free DNA Ladder Sample with the purchase of this enzyme through 9/30/2010! | |
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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
Description:
NcoI has a High Fidelity version NcoI-HF™ (NEB #R3193).
High Fidelity (HF) Restriction Enzymes have been engineered for reduced star activity and have 100% activity in buffer 4 which may simplify your double digest.
Source:
An E. coli strain that carries the NcoI gene from Nocardia corallina (ATCC 19070).
Reagents Supplied:
NEBuffer 3 (10X)
Enzyme Properties
Activity in NEBuffers:
| NEBuffer 1: | | 100% | | NEBuffer 2: | | 100% | | NEBuffer 3: | | 100% | | 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: Not sensitive | | CpG methylation: Not sensitive | |
More information about: Methylation Sensitivity |
Heat Inactivation:
65°C for 20 minutes
Survival in a Reaction:
(+ +) Intermediate activity. Suitable for extended digestion, but < 8 hours.
More information about: Extended Digests with Restriction Enzymes
Reaction & Storage Conditions
Reaction Conditions:
1X NEBuffer 3
Incubate at
37°C.
1X NEBuffer 3:
50 mM Tris-HCl
100 mM NaCl
10 mM MgCl2
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 λ DNA in 1 hour at 37°C in a total reaction volume of 50 µl.
Concentration:
10,000 units/ml and 50,000 units/ml
Unit Assay Substrate:
λ DNA
Storage Conditions:
10 mM Tris-HCl
50 mM KCl
1 mM Dithiothreitol
0.1 mM EDTA
200 µg/ml BSA
50% Glycerol
pH 7.4 @ 25°C
Storage Temperature:
-20°C
Diluent Compatibility:
Diluent A
Notes
General notes:- Conditions of low ionic strength, high enzyme concentration, glycerol concentration > 5%, or pH > 8.0 may result in star activity.
FAQs
- What is Star Activity and how can it be avoided?
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 5-fold overdigestion with NcoI, > 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 NcoI.
16-Hour Incubation:
A 50 μl reaction containing 1 μg of DNA
and 15 units of NcoI incubated for 16 hours at 37ºC
resulted in a DNA pattern free of detectable nuclease degradation as determined by agarose gel electrophoresis. Note that the high enzyme concentration described in this assay may result in star activity.
Exonuclease Activity:
Incubation of a 50 μl reaction containing 100 units of NcoI with 1 μg of a mixture of single and double-stranded
[3H] E. coli DNA (105 cpm/μg) for 4 hours at 37ºC
released < 0.24% of the total radioactivity.
Endonuclease Activity:
Incubation of a 50 μl reaction containing 15 units of NcoI with 1 μg of
ΦX174 RF I DNA for 4 hours at 37ºC resulted
in < 30% 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 3
Companion Products
NcoI-HF™
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