拓扑异构酶 I(E. coli) |NEB酶试剂 New England Biolabs

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产品信息

拓扑异构酶 I(E. coli)催化负超螺旋 DNA 的松弛。拓扑异构酶 I 也参与 DNA 螺旋化的形成和解旋(1)以及将两条互补的单链 DNA 环耦合为双链 DNA 环(2)。完整的全酶分子量为 97 kDa。

产品来源

大肠杆菌菌株,携带有 topA 基因

产品类别:
DNA Repair Enzymes and Structure-specific Endonucleases Products

  • 产品组分信息

    本产品提供以下试剂或组分:

    NEB # 名称 组分货号 储存温度 数量 浓度
    • M0301S     -20    
        Topoisomerase I (E. coli) M0301SVIAL -20 1 x 0.02 ml 5,000 units/ml
        rCutSmart™ Buffer B6004SVIAL -20 1 x 1.25 ml 10 X
    • M0301L     -20    
        Topoisomerase I (E. coli) M0301LVIAL -20 1 x 0.1 ml 5,000 units/ml
        rCutSmart™ Buffer B6004SVIAL -20 1 x 1.25 ml 10 X

  • 特性和用法

    单位定义

    1 单位指在 25 μl 总反应体系中,37℃ 条件下,15 分钟内能催化超过 95% 的 0.5 μg pUC19 RF I 型(负超螺旋)DNA 松弛所需的酶量。DNA 超螺旋化通过不含溴化乙锭的琼脂糖凝胶电泳来检测。

    反应条件

    1X rCutSmart™ 缓冲液
    Incubate at 37°C

    1X rCutSmart™ 缓冲液
    50 mM Potassium Acetate
    20 mM Tris-acetate
    10 mM Magnesium Acetate
    100 µg/ml Recombinant Albumin
    (pH 7.9 @ 25°C)

    在不同缓冲液中的活性

    NEBuffer™ 1: 25%
    NEBuffer™ 2: 50%
    NEBuffer™ 3: 0%
    NEBuffer™ 4: 100%

    贮存溶液

    10 mM Tris-HCl
    35 mM (NH4)2SO4
    50 mM KCl
    1 mM DTT
    0.1 mM EDTA
    50% Glycerol
    pH 7.5 @ 25°C

    热失活

    65°C for 20 minutes

  • 相关产品

    相关产品

    • t1010-monarch-plasmid-miniprep-kit
    • Monarch® DNA 胶回收试剂盒
    • Monarch® PCR & DNA 纯化试剂盒(5 μg)

  • 参考文献

    1. Liu, L.F., Depew, R.E. and Wang, J.C. (1976). J. Mol. Biol.. 106, 439-452.
    2. Kirkegaard, K. and Wang, J.C. (1978). Nucl. Acids Res.. 5, 3811-3820.

操作说明、说明书 & 用法

  • 操作说明

    1. Protocol for Topoisomerase I (E. coli) (M0301)

  • 使用指南

    • DNA Damage and PreCR

FAQs & 问题解决指南

  • FAQs

    1. Does Topoisomerase I relax all supercoiled DNA to the same degree or are the products an equilibrium of various conformations?
    2. If the DNA resulting from a Topoisomerase I reaction is run in an ethidium bromide gel and there seems to be no evidence of enzyme activity, what is the most probable explanation?
    3. What is the molecular weight of Topoisomerase I?
    4. Can Topoisomerase I relax both positively and negatively supercoiled DNA?
    5. Does E. coli Toposiomerase I have the same properties as the Vaccinia Topoisomerase I?
    6. Will Topoisomerase I produce single strand-breaks in a plasmid?
    7. Can you tell me more about the switch from BSA to Recombinant Albumin (rAlbumin) in NEBuffers?