Marimo - iGEM 2007

Chiba iGEM 2007
Marimo
What the hell is Marimo?
• Marimo (Japanese: 毬藻 marimo), also
known as Cladophora ball, Lake ball,
or Moss Balls in English, is a species of
filamentous green algae (Chlorophyta)
found in a number of lakes in the
northern hemisphere.
• blabla…
To make a bacterial Marimo
1
3
まりも完成
2
Our System
1. Gather bacteria
–
Quorum Sensing
2. Stick bacteria together
–
flagella: fliC gene
3. Control size (advanced)
–
Tune Quorum Sensing
Detailed Design
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AHL
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AHL
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AH
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AHL
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Detailed Design: Sender Cell
• Constitutively express
flagella
• Produce AHL
Detailed Design: Reciever Cell
• LuxP > flagella
• no AHL > aiiA ??
Detailed Design: Overview
①Senderは常に鞭毛が生えていて、AHLを生産する。
②ReceiverはAHL存在下で鞭毛が生えて、AiiAによりAHLを分解する。
③鞭毛にはヒスタグが付いているのでニッケルイオンを仲介としてくっつく。
R
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AHL
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AHL
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AH
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AHL
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Experiments & Results
Quorum sensing, FliC-his gene
Experiments
1. Quorum Sensing
–
–
modify? for a lab-class 自由溶液
size-tunable
2. Flagella (fliC) engeneering
Quorum Sensing in a liquid…
• To make the AHL conc. gradation
– Sender(=AHL producer) Problem
• Senderを固める(拡散させない)
• 必要量のAHLを出すSenderの数
– AHL拡散 Problem
• solvent’s viscosity
• AHL溜る -> 分解する(aiiA)
Size Control
• Super Sender Cell
– Produce more AHL
• Super Reciever Cell
– Sensitive
To Make a Marimo
1. Check the flagella adsorption
w/Quorum sensing
2. 2-dimensional test @ plate
3. 3-dimensional (marimo)
4. Size control test
Controling Marimo Size
What we learned
Acknowledgements