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Restriction Endonucleases >
Restriction Endonucleases >
Tsp45I |
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Recognition Site:
isoschizomers | compatible ends | single letter code
Source:
Thermus species YS45 (R.A.D. Williams)
Reagents Supplied:
NEBuffer 1
BSA
Enzyme Properties
Activity in NEBuffers:
| NEBuffer 1: | | 100% | | NEBuffer 2: | | 25% | | NEBuffer 3: | | 0% | | NEBuffer 4: | | 75% |
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 |
Activity at 37°C:
10%
Heat Inactivation:
No
Survival in a Reaction:
Minimum units to digest 1 µg of substrate DNA in 16 hours: 0.50 unit(s)
Reaction & Storage Conditions
Reaction Conditions:
1X NEBuffer 1
Supplemented with 100 μg/ml Bovine Serum Albumin
Incubate at
65°C.
1X NEBuffer 1:
10 mM Bis-Tris-Propane-HCl
10 mM MgCl2
1 mM Dithiothreitol
pH 7.0 @ 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 65°C in a total reaction volume of 50 µl.
Concentration:
4,000 units/ml
Unit Assay Substrate:
λ DNA
Storage Conditions:
20 mM Tris-HCl
1 mM Dithiothreitol
0.1 mM EDTA
200 µg/ml BSA
50% Glycerol
0.15% Triton X-100
pH 7.4 @ 25°C
Storage Temperature:
-20°C
Diluent Compatibility:
Diluent A
FAQs
- Do degenerate recognition sites need to be palindromic?
- How can this enzyme be inactivated?
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 Tsp45I, > 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 Tsp45I.
16-Hour Incubation:
A 50 μl reaction containing 1 μg of DNA
and 100 units of Tsp45I incubated for 16 hours at 65ºC
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 12 units of Tsp45I with 1 μg of a mixture of single and double-stranded
[3H] E. coli DNA (205 cpm/μg) for 4 hours at 65ºC
released < 0.5% of the total radioactivity.
Reagents Sold Separately
NEBuffer 1
BSA
Legal
Patents:
New England Biolabs, Inc.: U.S. Patent No. 5,866,422
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