High Fidelity (HF®) Restriction Enzymes have 100% activity in CutSmart™ Buffer; single-buffer simplicity means more straightforward and streamlined sample processing. HF enzymes also exhibit dramatically reduced star activity. HF enzymes are all Time-Saver™ qualified and can therefore cut substrate DNA in 5-15 with the flexibility to digest overnight without degradation to DNA. Engineered with performance in mind, HF restriction enzymes are fully active under a broader range of conditions, minimizing off-target products, while offering flexibility in experimental design.
Product SourceAn E. coli strain that carries the cloned and modified StyI gene from Salmonella typhi (E.K. Anderson)
The following reagents are supplied with this product:
|Store at (°C)||Concentration|
|Gel Loading Dye, Purple (6X)||25||6X|
Properties and Usage
Unit DefinitionOne 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.
1X CutSmart® Buffer
Incubate at 37°C
1X CutSmart® Buffer:
50 mM Potassium Acetate
20 mM Tris-acetate
10 mM Magnesium Acetate
100 μg/ml BSA
pH 7.9 @ 25°C
Activity in NEBuffersNEBuffer 1.1: 25%
NEBuffer 2.1: 100%
NEBuffer 3.1: 25%
CutSmart® Buffer: 100%
10 mM Tris-HCl
50 mM NaCl
1 mM DTT
0.1 mM EDTA
200 μg/ml BSA
pH 7.4 @ 25°C
Heat Inactivation65°C for 20 min
dam methylation: Not Sensitive
dcm methylation: Not Sensitive
CpG Methylation: Not Sensitive
Quality Control AssaysThe following Quality Control Tests are performed on each new lot and meet the specifications designated for the product. Individual lot data can be found on the Product Summary Sheet/Datacard or Manual which can be found in the Supporting Documents section of this page.
- Endonuclease Activity (Nicking):
The product is tested in a reaction containing a supercoiled DNA substrate. After incubation for 4 hours the percent converted to the nicked form is determined by agarose gel electrophoresis.
- Exonuclease Activity (Radioactivity Release):
The product is tested in a reaction containing a radiolabeled mixture of single and double-stranded DNA. After incubation for 4 hours the exonuclease activity is determined by the % release of radioactive nucleotides.
- Ligation and Recutting (Terminal Integrity):
After an over-digestion of DNA with a restriction endonuclease the percentage of the DNA fragments ligated with T4 DNA ligase and the percentage that can be recut are determined by agarose gel electrophoresis.
- Non-Specific DNase Activity (16 hour):
The product is tested for non-specific nuclease degradation in a reaction containing a DNA substrate. After incubation for 16 hours there is no detectable degradation of the DNA substrate as determined by agarose gel electrophoresis.
US 2014/0154676, EP 2395079 (FR, GB, LT, DE 602008036313.9)
- How does the level of star activity of StyI-HF compare to StyI?
- What is the difference between StyI-HF and StyI?
- What is the specific activity of StyI-HF?
- Is there a difference in cutting close to the ends between StyI-HF and StyI?
- Is there any difference in the methylation sensitivity between StyI-HF and StyI?
- When should I choose the HF version of the enzyme?
- When is star activity a concern?
- Why does the HF version of the enzyme have a different recommended buffer than the wild type enzyme?
- When should I choose the High Fidelity (HF) version of the enzyme?
- How is the improvement in fidelity of HF restriction endonucleases quantitated?
- Can the change in buffer preference of the HF enzyme be advantageous?
- Will the HF enzyme produce elevated star activity when used in a buffer other than the one recommended?
- What does it mean to be Time-Saver™ qualified?
- What is the Fidelity Index (FI)?
- What does HF® refer to following the name of a restriction enzyme?
- What effect does BSA have on the performance of NEB’s restriction enzymes when included in the new buffers?
- Do I have to set-up digests with Time-Saver™ qualified enzymes for 5-15 minutes? Can I digest longer?
- How can I access the old NEBuffer Activity Chart?
- I tested your restriction enzyme on the substrate DNA recommended by NEB, and it appears to be active, however it does not digest my DNA. What could be the reason?
- Is Gel Loading Dye, Purple (6X) or Gel Loading Dye, Purple (6X), no SDS compatible with other DNA binding dyes such as SYBR® and GelRed™ during gel electrophoresis?
- Can Gel Loading Dye, Purple 6X (B7024) be stored in cold temperatures?