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 R R AHL R R R R S S R R R R R R S S AHL R AH L R R R R R R AHL R R R R 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 R AHL R R R R S S R R R R R R S S AHL R AH L R R R R R R AHL R R R R 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
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