Team:Chiba/Experiments:copy number

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Copy number of Receiver Plasmid

Design

Receiver copy number chiba.jpg

レシーバーのコピーナンバーを変えることで、応答までの時間を変える
コピーナンバーを変えれば、レシーバーによるLuxRの合成量は変化する
AHLを受け取るLuxRが変わるので応答閾値までの時間が変わると考えた

Experiment

  • High Copy Receiver[http://partsregistry.org/Part:BBa_T9002 BBa_T9002 (AHL Reporter)]

T9002.copy-number-change Chiba.gif


  • Medium Copy Receiver

Low-copy-Receiver Chiba.gif



Result & Discussion

more about Plasmid Copy number

Fig. Time Delay Test


  • クオラムセンシングに関わる遺伝子のベクタープラスミドのコピーナンバーを少なくすることで、遺伝子発現が遅くなる
  • それと同時に、遺伝子発現の最大値自体も少なくなってしまう

more about experimental result




Method

  1. Transformed sender(Ptet-LuxI), high copy receiver(Ptet-LuxR-Plux-GFP-colE1) and Medium copy receiver(Ptet-LuxR-Plux-GFP-p15A) respectively into E coli strains(BD⊿FliC).
  2. Inoculated them independently in liquid media. Incubated at 37°C 12h.
  3. Inoculated again in Fresh liquid media upto about OD600=2 at 37°C
  4. Washed sender and receivers.
  5. Mixed them. (Sender:Receiver=1000μL:1000μL)
  6. Incubated at 30°C.
  7. Measured intensity of green fluorescence at regular time intervals.(Fluoroskan AscentR FL＆Fluoroskan AscentR　Thermo ELECTRON CORPORATION)
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