Serratia marcescens secretes an endonuclease that has exceptionally high specific activity to the medium that surrounds it. The Benzonase Nuclease is mainly used for elimination of nucleic acid contamination from purified proteins, downstream processing, reduction of viscosity etc. Nucleic acid contaminants are caused by nuclease released to the medium. The DNA is being destroyed by the release of the S. marcescens nuclease and it acts as the killer gene for the auto destruction of microorganisms.
Benzonase Nuclease Serratia Marcescens Recombinant produced in E.coli is a single, non-glycosylated polypeptide chain containing 245 amino acids and having a molecular mass of 30kDa with 2 essential disulfide bonds.
Benzonase Nuclease is purified by proprietary chromatographic techniques.
The Benzonase Nuclease solution contains 50% glycerol, 50 mM Tris-HCl pH 8.0, 20 mM NaCl and 2 mM MgCl2.
For long term storage it is recommended to add a carrier protein (0.1% HSA or BSA).
Avoid multiple freeze-thaw cycles.
Greater than 90% as determined by SDS-PAGE.
1U Benzonase Nuclease is defined as the amount of enzyme that causes a ΔA260 of 1 in 30 min, which corresponds to complete digestion of 37μg DNA. Standard reaction conditions are 1mg/ml sonicated DNA substrate in 50mM Tris-HCl pH 8.0, 0.1mg/ml BSA, 1mM MgCl2, incubated at 37°C.
Unspecific (DNA, RNA) attacks all nucleic acids (single strand, double strand, circular, supercoiled) with no apparent sequence preference. Final reaction product:
5’-mono-phosphate terminated oligonucleotides (3-5 bases).
Protease Activity: Not detectable