dam–/dcm– E. coli 感受态细胞 |NEB酶试剂 New England Biolabs

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产品信息

缺失甲基转移酶的化学感受态大肠杆菌细胞,适合扩增无 Dam 和 Dcm 甲基化修饰的质粒。请注意,不建议将 dam 菌株作为初级克隆/连接的宿主细胞。dam 突变会导致细胞内突变率增加和转化效率降低。DNA 应保持在 dam+ 菌株中,除非对无 Dam 或 Dcm 甲基化 DNA 有特定需求。

重点

  • 扩增无 Dam 和 Dcm 甲基化修饰的质粒
  • 无动物来源
  • 抗 T1 噬菌体(fhuA31
  • 去除了非特异性核酸内切酶 I(endA1)的活性,以获得最高质量的质粒制备
  • K12 菌株

基因型

ara-14 leuB6 fhuA31 lacY1 tsx78 glnV44 galK2 galT22 mcrA dcm-6 hisG4 rfbD1 R(zgb210::Tn10) TetS endA1 rspL136 (StrR) dam13::Tn9 (CamR) xylA-5 mtl-1 thi-1 mcrB1 hsdR2

产品类别:
Cloning Competent Cell Strains Products

应用:
High-throughput cloning and automation solutions,
Transformation

  • 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
    • C2925H     -80    
        pUC19 Vector N3041AVIAL -20 1 x 0.025 ml 50 pg/µl
        SOC Outgrowth Medium B9020SVIAL 4 1 x 25 ml Not Applicable
        dam/dcm Competent E. coli C2925HVIAL -80 20 x 0.05 ml Not Applicable
    • C2925I     -80    
        pUC19 Vector N3041AVIAL -20 1 x 0.025 ml 50 pg/µl
        SOC Outgrowth Medium B9020SVIAL 4 1 x 25 ml Not Applicable
        dam/dcm Competent E. coli C2925IVIAL -80 6 x 0.2 ml Not Applicable

  • 特性和用法

    Antibiotic for Plasmid Selection

    用于质粒筛选的抗生素 使用浓度
    Ampicillin 100 µg/ml
    Carbenicillin 100 µg/ml
    Kanamycin 30 µg/ml
    Tetracycline 15 µg/ml

    货运单

    • Ships on dry ice

    抗生素耐药性

    • str
    • nit
    • cam

  • 优势和特性

    Features

    • 扩增无 Dam/Dcm 甲基转移酶的质粒

    应用特性

    热激时间对 dam/dcm E. coli 感受态细胞转化效率的影响:dam–/dcm– E. coli 感受态细胞 |
    按照所提供的高效级转化操作流程,用 100 pg pUC19 对照 DNA 转化 50 μl 感受态细胞,热激时间的变化范围为 0 至 80 秒。
    DNA 温育时间对 dam–/dcm– E. coli 感受态细胞转化效率的影响:dam–/dcm– E. coli 感受态细胞 |
    按照所提供的高效级转化操作流程,用 100 pg pUC19 对照 DNA 转化 50 μl 感受态细胞,DNA 温育时间的变化范围为 0 至 40 分钟。
    细胞复苏培养基对转化效率的影响:dam–/dcm– E. coli 感受态细胞 |
    按照所提供的高效级转化操作流程,用 100 pg pUC19 对照 DNA 转化 50 μl -/dcm E.coli 感受态细胞,其中不同反应之间使用的细胞复苏培养基不同。NEB SOC Outgrowth 培养基的转化效率最高。

  • 相关产品

    相关产品

    • NEB® 10-beta E. coli 感受态细胞(高效级)
    • NEB® 5-alpha E. coli 感受态细胞(亚克隆效级)
    • NEB® 5-alpha F’ Iq E. coli 感受态细胞(高效级)
    • NEB® Turbo E. coli 感受态细胞(高效级)
    • NEB® 5-alpha E. coli 感受态细胞(高效级)
    • t1010-monarch-plasmid-miniprep-kit
    • Monarch® DNA 胶回收试剂盒
    • Monarch® PCR & DNA 纯化试剂盒(5 μg)

    单独销售的组分

    • SOC Outgrowth 培养基

  • 注意事项

    1. 注意:本产品含危险物质 DMSO。处理前请先查看 MSDS。
    2. 贮存和处理:感受态细胞应在 -80℃ 条件下贮存。-20℃ 条件下贮存会显著降低转化效率。当细胞温度高于 -80℃ 时,即使不融化,细胞也会失去效率。

操作说明、说明书 & 用法

  • 操作说明

    1. Transformation Protocol (C2925)

  • 使用指南

    • Additional E. coli Strain Genotypes
    • Chemical Transformation Tips
    • Competent E. coli Genome Sequences Tool
    • Genetic Markers
    • Making Unmethylated (Dam- Dcm-) DNA
    • McrA, McrBC and EcoKI Strain Phenotypes

  • 应用实例

    • Enhancing Transformation Efficiency

工具 & 资源

  • 选择指南

    • Characteristics of Select E.coli Strains
    • Competent Cell Product Comparison
    • Competent Cell Selection Guide

  • Web 工具

    • Competitor Cross-Reference Tool
    • NEBcloner®

FAQs & 问题解决指南

  • FAQs

    1. Can I transform unmethylated DNA into dam/dcm competent E.coli (C2925)?
    2. Does New England Biolabs offer a methyltransferase free strain of Competent E.coli?
    3. How long should I incubate cells on ice after DNA has been added (NEB #C2925H and NEB #C2925I)?
    4. Is dam/dcm (NEB #C2925H/C2925I) resistant to kanamycin?
    5. Is the DNA yield lower using dam/dcm strain (C2925)?
    6. What are the solutions/recipes (C2925)?
    7. What are the strain properties (C2925)?
    8. What is the difference between NEB #C2925H and NEB #C2925I?
    9. What is the optimal heat shock time for this strain (NEB #C2925H and NEB #C2925I)?
    10. Which strain of Competent E.coli should I use for general cloning?
    11. Why were the colonies at different size after transformation of dam/dcm competent E.coli (C2925)?
    12. How should I calculate the transformation efficiency (C2925)?
    13. Can I store competent cells at -20°C instead of -80°C?
    14. Which kind of transformation tubes should be used?
    15. What volume of DNA can be added into competent cells?
    16. What is the shelf life for this strain (NEB #C2925H and NEB #C2925I)?
    17. Are NEB’s competent cells compatible with the “Mix & Go” protocol?
    18. How should I store SOC Outgrowth Medium? The SOC I received with my competent cells recommends storage at either room temperature or 4°C, however, when I purchase it as a stand alone product, it recommends storing it at 4°C. Which is better?
    19. How should fragments be prepared for assembly using NEBuilder HiFi?