| Recognition site | GGATG(N)9↑
CCTAC(N)13↓ |
| Source | E.coli strain that carries the cloned Fok I gene from Flavobacterium okeanokoites |
| Assayed on | Lambda DNA |
| Unit definition | One unit of the enzyme is the amount required to hydrolyze 1 μg of Lambda DNA in 1 hour at 37°C in a total reaction volume of 50 μl. |
| Optimal SE-buffer | Y (33 mM Tris-acetate (pH 7.9 at 25°C); 10 mM magnesium acetate; 66 mM potassium acetate; 1 mM DTT.) |
| Enzyme activity (%) | | B | G | O | W | Y | R | | 50 - 75 | 50 - 75 | 25 - 50 | 25 - 50 | 100 | 100 |
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| Optimal temperature | 37oC |
| Storage conditions | 10 mM Tris-HCl (pH 7.5); 50 mM NaCl; 0,1 mM EDTA; 1 mM DTT; 200 μg/ml BSA; 50% glycerol; Store at -20°C. |
| Ligations | After 2-fold overdigestion with enzyme more than 95% of the DNA fragments can be ligated and recut. |
| Non-specific hydrolisis | No nonspecific activity was detected after incubation of 1 μg of Lambda DNA with 1 u.a. of enzyme for 16 hours at 37°C
|
| Reagents Supplied with Enzyme |
10 X SE-buffer Y |
| Methylation sensitivity | not tested |
| Inactivation 20 minutes under | 65oC |
| Notes | Overdigestions of > 5 units of Fok I per 1μg of DNA and incubation times > 2 hours are not recommended. |
| MSDS: | Download MSDS as PDF |
| References: | Sugisaki, H., Kanazawa, S., Gene 16: 73-78 (1981).
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Theoretical diagrams of DNA digestion by this enzyme for the most known DNA substrates:
To view the fragments length values please point mouse cursor over diagram |
M - ladder, 1 - Adeno-2 DNA, 2 - Lambda DNA, 3 - T7 DNA, 4 - pUC19, 5 - pBR322
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