Hpa I

Description

Recognition site and hydrolysis position:

Source: An E.coli strain, that carries the cloned gene Hpa I from Haemophilus parainfluenzae
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.
Assayed on:
Lambda DNA
Optimal SE-buffer: SE-buffer Y
Enzyme activity (%):

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 5-fold overdigestion with enzyme about 60% 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 5 u.a. of enzyme for 16 hours at 37°C. Reagents Supplied with Enzyme 10 X SE-buffer Y.
Reagents Supplied with Enzyme:
Methylation sensitivity: not tested
Notes: High enzyme concentration results in star activity.
References:
Sharp, P.A., Sugden, B., Sambrook, J. Biochemistry 12: 3055-3063 (1973). Garfin, D.E., Goodman, H.M. Biochem. Biophys. Res. Commun. 59: 108-116 (1974).