D4513

Deoxyribonuclease I from bovine pancreas

Type II-S, lyophilized powder, Protein ≥80 %, ≥2,000 units/mg protein

• Synonym(s): DNase I, Deoxyribonucleate 5′-oligonucleotido-hydrolase
• CAS Number: 9003-98-9
• Enzyme Commission number: 3.1.21.1 (BRENDA, IUBMB)
• EC Number: 232-667-0
• MDL number: MFCD00130918
• UNSPSC Code: 12352204
• NACRES: NA.54

Properties

• biological source: bovine pancreas
• sterility: sterile-filtered
• type: Type II-S
• form: lyophilized powder
• specific activity: ≥2,000 units/mg protein
• mol wt: ~31 kDa
• purified by: chromatography
• composition: Protein, ≥80%
• packaging: vial of ≥10.0 mg protein
• technique(s): DNA purification: suitable
• impurities: endotoxin, tested
• solubility: 0.15 M NaCl: soluble 5.0 mg/mL, clear(lit.)
• suitability: suitable for molecular biology
• application(s): diagnostic assay manufacturing; diagnostic assay manufacturing
• foreign activity: Chymotrypsin ≤0.01%; Protease ≤0.005%; RNase ≤0.01%
• storage temp.: −20°C

Description

Application

DNAse I from Sigma has been compared with human urine-derived interleukin 1 inhibitor for the ability to hydrolyze [¹⁴C]DNA [¹⁴C]DNA. It has also been used to cleave a 139 base pair Hind III/Nci I restriction fragment to investigate the stability of the enzyme for use in footprinting experiments. DNase I is widely used as a footprinting agent for studying drug and protein binding to DNA.

Deoxyribonuclease I from bovine pancreas has been used in a study to investigate a new approach to obtaining high-activity RNase, DNase, cholesterolesterase, and trypsin from cattle pancreas. Deoxyribonuclease I from bovine pancreas has also been used in a study to investigate the isolation and further characterization of carp liver DNase.

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. In the presence of Mg²⁺, DNAse I cleaves each strand of DNA independently and the cleavage sites are random. Both DNA strands are cleaved at approximately the same site in the presence of Mn²⁺. The pH optimum lies 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. DNAse I from bovine pancreas consists of four chromatographically distinguishable components, A, B, C, and D, with their molar ratios being 4:1:1 respectively. Only minor amounts of D are found. 2-Mercaptoethanol, chelators, sodium dodecyl sulfate (SDS) and actin are known to inhibit the enzyme activity.

Unit Definition

One Kunitz unit will produce a ΔA₂₆₀ of 0.001 per min per mL at pH 5.0 at 25 °C, using DNA, Type I or III as substrate. (1 unit = 1 Kunitz unit)

Physical form

Lyophilized powder containing calcium chloride

Preparation Note

The enzyme powder may be reconstituted in water or any buffer at pH 4.0-9.0, except phosphate buffer. Calcium chelators should be avoided. 10 mg/mL solution of DNAse I in 0.15 M NaCl may lose <10% of its activity when stored for a week in aliquots at −20 °C. The same solutions stored in aliquots at 2-8 °C can lose approximately 20% activity. It remains active for up to five hours at 60 °C between pH 5 and 7, and loses activity in <10 minutes at 68 °C. It loses activity at the rate of 6%/hour in acetate buffer (pH 5.0) and tris buffer ((pH 7.2) at 1 mg/mL concentration.

Analysis Note

Protein determined by biuret.

Other Notes

2024 CiteAb Award Winner for Supplier Succeeding in Parkinson′s Research

Safety Information

• Pictograms: GHS08
• Signal Word: Danger
• Hazard Statements: H334
• Precautionary Statements: P261 - P284 - P501
• Hazard Classifications: Resp. Sens. 1
• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 3
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves