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Restriction Endonucleases >
Restriction Endonucleases >
BmrI |
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Recognition Site:
isoschizomers | compatible ends | single letter code
Source:
An E.coli strain that carries the cloned BmrI gene from Bacillus megaterium (T. Le).
Reagents Supplied:
NEBuffer 2
Enzyme Properties
Activity in NEBuffers:
| NEBuffer 1: | | 75% | | NEBuffer 2: | | 100% | | NEBuffer 3: | | 75% | | 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 |
Heat Inactivation:
65°C for 20 minutes
Survival in a Reaction:
Minimum units to digest 1 µg of substrate DNA in 16 hours: 1.00 unit(s)
Reaction & Storage Conditions
Reaction Conditions:
1X NEBuffer 2
Incubate at
37°C.
1X NEBuffer 2:
10 mM Tris-HCl
50 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 (Hind III digest) in 1 hour at 37°C in a total reaction volume of 50 µl.
Concentration:
1,000 units/ml
Unit Assay Substrate:
λ DNA (HindIII digest)
Storage Conditions:
10 mM Tris-HCl
250 mM NaCl
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 B
Notes
General notes:- BmrI produces DNA fragments that have a single base 3´ extension which are more difficult to ligate than blunt-ended fragments.
- BmrI cleaves DNA specifically both in the presence and absence of Mg2+ ions in the reaction mixture.
- Overnight digestion with BmrI is not recommended.
- Active in the presence of EDTA.
FAQs
- Do BmrI generated ends ligate well?
- Is extended digestion of BmrI recommended?
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 2-fold overdigestion with BmrI, approximately 75%
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 BmrI.
16-Hour Incubation:
A 50 μl reaction containing 1 μg of DNA
and 4 units of BmrI incubated for 16 hours at 37ºC
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 4 units of BmrI with 1 μg of a mixture of single and double-stranded
[3H] E. coli DNA (105 cpm/μg) for 4 hours at 37ºC
released < 0.1% of the total radioactivity.
Endonuclease Activity:
Incubation of a 50 μl reaction containing 4 units of BmrI with 1 μg of
ΦX174 RF I DNA for 4 hours at 37ºC resulted
in < 10% conversion to RFII as determined by agarose gel electrophoresis.
Reagents Sold Separately
NEBuffer 2
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