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D5319 Sigma-Aldrich

Deoxyribonuclease I bovine

recombinant, expressed in Pichia pastoris, buffered aqueous glycerol solution, ≥5,000 units/mg protein

Synonym: DNAse I, Deoxyribonucleate 5′-oligonucleotido-hydrolase



Related Categories 3.1.x.x Acting on esters, 3.x.x.x Hydrolases, Analytical and Industrial Enzymes, Application Index, Biochemicals and Reagents,
recombinant   expressed in Pichia pastoris
form   buffered aqueous glycerol solution
mol wt   ~39 kDa
foreign activity   RNAse and protease, free
shipped in   dry ice
storage temp.   −20°C



DNAse I from Sigma was used to treat nuclear lysate to obtain single nucleosomes in a study. The enzyme has also been for the preparation and harvest of mice mammary glands.

Deoxyribonuclease I bovine has been used in a study to compare the initial actions of spleen deoxyribonuclease and pancreatic deoxyribonuclease. Deoxyribonuclease I bovine has also been used in a study to investigate deoxythymidine 3′, 5′-di-p-nitrophenyl phosphate as a synthetic substrate for bovine pancreatic deoxyribonuclease.

Used for the removal of DNA from protein samples.

Biochem/physiol Actions

DNase I is an endonuclease that acts on phosphodiester bonds (adjacent to pyrimidines) to produce polynucleotides with terminal 5′-phosphates. The pH optimum is found to be between 7 and 8. Divalent cations such as Mn2+, Ca2+, Co2+, and Zn2+ are activators of the enzyme. A concentration of 5 mM Ca2+ stabilizes the enzyme against proteolytic digestion. 2-Mercaptoethanol, chelators, sodium dodecyl sulfate (SDS) and actin are known to inhibit the enzyme activity.

Digests single- and double-stranded DNA to a mixture of mono- and oligonucleotides carrying 5′ phosphates and 3′ OH termini. This catalytic activity is divalent ion-dependent. In the presence of Mg2+, DNase I hydrolyzes each strand of double-stranded DNA randomly and independently. In the presence of Mn2+, both strands can be cleaved.

Features and Benefits

• RNA purification by removing DNA
• Prepare DNA for nick translation1
• Footprinting assays to determine DNA-protein interactions2

Unit Definition

One unit will produce a ΔA260 of 0.001 per min per mL reaction mixture using calf thymus DNA at pH 5.0 and 25°C

Physical form

Supplied as a solution in 4 mg/ml glycine pH 5.0, 5 mM calcium acetate and 50% glycerol

Preparation Note

Produced without using any animal cells or animal derived materials.

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis


Certificate of Origin

Protocols & Articles

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