Chiba/Project Design
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====[[Chiba/Quorum_Sensing|3.Size Control]]==== | ====[[Chiba/Quorum_Sensing|3.Size Control]]==== | ||
Make an '''AHL localized region''' for quorum sensing. | Make an '''AHL localized region''' for quorum sensing. | ||
| - | [[Image:Chiba_proj_ahlconc.png|frame|left|'''Fig3.''' AHL | + | [[Image:Chiba_proj_ahlconc.png|frame|left|'''Fig3.''' Controlling AHL diffusing area and the size of Bacteria Marimo.]] |
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Revision as of 22:32, 26 October 2007
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Introduction | Project Design ( 1.Sticky Hands | 2.Communication | 3.Size Control ) | Making Marimos | Our Goal || Team Members | メンバ連絡簿 |
Project Design
Concept
(photo taken from Agriculture, Forestry and Fishes Technical Information Society, Japan, http://www.afftis.or.jp/index.html)
We aimed to make a spherical gathering of bacteria such like marimo by ordering bacteria go get together and stick to each other.
What our system requires
1.Sticky TagMake a His-tagged Flagella. We aimed to stick bacteria by displaying histidines (which bonds each other through metal ions) on the flagellar filament.  Fig1. His-tagged flagella as a bactria linker. This image depicts only one tail as flagella (the real bacteria have about ten flagella per cell). |
2.CommunicationMake a Bacterial Communication. We make 2 types of cell(sender&receiver) having different gene circuit. Senders sticking each other in advance send a signal to receivers and receivers grow sticky hands.  Fig2. Bacterial Communication. |
3.Size ControlMake an AHL localized region for quorum sensing.  Fig3. Controlling AHL diffusing area and the size of Bacteria Marimo. |
How Our System Works
- Senders whose flagella display the histidine tags stick to each other through metal ions. This becomes the core of Bacteria Marimo. The senders also produce AHL to sign the receiver cells.
- Receivers express his/flagella and GFP in high [AHL]; only when they get close to the senders core.
- Receivers stick to the senders core and themselves through metal ions.... one after another.
- As seen, the cluster grows like a snowball. At the same time, the receivers degrade AHL and thus AHL diffusion space around the mixed cluster limited. By controlling the rate of AHL degradation and so on, one can define the size of such Bacteria Marimo.
