脱氧核糖核酸酶I来源于牛胰腺，Deoxyribonuclease I from bovine pancreas [DNase I]；lyophilized powder, Protein ≥85 %, ≥400 Kunitz units/mg protein

General description

DNase I, or Deoxyribonuclease I, is an endonuclease isolated from bovine pancreas.
• Our DNase I Digests double str and single stranded DNA into oligo and mononucleotides.
• Bovine pancreatic DNase exists as four isozymes, having isoelectric points for A, B, C and D: 5.22, 4.96, 5.06 and 4.78.3. The predominant form is A, with smaller amounts of B and C, and only minor amount of D.
• DNase I structure resembles the structure of to exonuclease III. It includes two central ß sheets. Each β sheet is composed of six β-strands. This complex of β sheets is surrounded by extensive loop and α-helical regions. This enzyme shares structural similarity to exonuclease III.^[1]

Application

• Decreases viscosity providing better yields by removing DNA in primary cell isolation:
• Incorporating labelled bases into DNA: DNA nick
• Radioactive labelling
• Bioprocessing applications: DNA removal
• Eliminating genomic DNA from RNA preparations before RT-PCR
• In vitro transcription
• Nick translation
• DNase footprinting
• Actin regulation of actin polymerization in cells, and cell apoptosis
• UV crosslinking of proteins to nucleic acids
• DNase play a role in the regulation of actin polymerization in cells and is involved in apoptosis process ^[1]

用于从蛋白质样品中除去 DNA。

包装

1, 5 g in poly bottle

10, 100 mg in poly bottle

Biochem/physiol Actions

DNase I是一种内切核酸酶，可作用于与嘧啶相邻的磷酸二酯键以产生具有末端5′-磷酸的聚核苷酸。当Mg²⁺存在时，DNAse I可独立切割DNA的每条链且切割位点是随机的。当Mn²⁺存在时，两条DNA链都几乎是在同样的位置被切割。^[6]二价阳离子如Mn²⁺, Ca²⁺, Co²⁺以及Zn²⁺都是酶的激活剂。5 mM浓度的Ca²⁺可稳定酶免收蛋白水解酶的消化。最适pH在7-8之间。^[7]来自牛胰腺的DNAse I由四种色谱可区分的组分A，B，C和D组成，它们的摩尔比分别为4:1:1。仅发现少量D。^[5]2-巯基乙醇、螯合剂、十二烷基硫酸钠（SDS）^[4]和肌动蛋白^[1]都已知可抑制酶的活性。

Features and Benefits

Our Deoxyribonuclease DNAse I,is essentially RNAse free product, which support the product application.

Unit Definition

一Kunitz单位的酶在以I型或III型DNA作为底物时，在 pH 5.0，37°C的条件下在每mL中每分钟可引起0.001的A₂₆₀改变。

Physical form

粗制品，含有氯化钙

Preparation Note

溶液0.15 M NaCl的10 mg/mL DNAse I溶液分装保存在−20 °C一周后可能会丢失<10%的活性。同样的溶液保存在2-8 °C则可能丢失约20%的活性。当在pH 5和7之间时，它可在60 °C维持活性最长达五小时，并在68 °C <10分钟内丢失活性。它在乙酸缓冲液（pH 5.0）和tris缓冲液((pH 7.2)，1 mg/mL浓度)中以6%/小时的速率丢失活性。

Analysis Note

Protein determined by biuret.

性质

安全信息

符号

  GHS08

信号词 Danger

危害声明 H334

警示性声明 P261 - P284 - P304 + P340 + P312 - P501

个人防护装备 Eyeshields, Gloves, type N95 (US)

RIDADR NONH for all modes of transport

WGK德国 WGK 3

RTECS RF0750000