Team:Paris/Transduction overview2 strategy

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==Signal transduction : Overview  ==
 
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* [[Team:Paris/Transduction_overview2#Overview#bottom | Introduction]]
 
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* [[Team:Paris/Transduction_overview_transduction#bottom |A. Transduction]]
 
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** [[Team:Paris/Transduction_overview_transduction#A.1 ABC transporters|A.1 ABC transporters]]
 
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** [[Team:Paris/Transduction_overview_transduction#A.2 Two-component system|A.2  Two Component System]]
 
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* [[Team:Paris/Transduction_overview2_strategy#bottom |B. Our strategy]]
 
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** [[Team:Paris/Transduction_overview2_strategy#B.1 The Fec operon |B.1 The Fec operon]]
 
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** [[Team:Paris/Transduction_overview2_strategy#B.2 The trick TCS|B.2 The trick TCS]]
 
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* [[Team:Paris/Transduction_overview2_construction#bottom |C. Construction]]
 
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==B. Our Strategy==
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==Our strategy: The Fec operon ==
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<a class="menu_sub"href="https://2009.igem.org/Team:Paris/Transduction_overview2#bottom"> Main </a>|
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<a class="menu_sub" href="https://2009.igem.org/Team:Paris/Transduction_overview2_transduction#bottom"> Transduction</a>|
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<a class="menu_sub_active"href="https://2009.igem.org/Team:Paris/Transduction_overview2_strategy#bottom"> Our strategy</a>|
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<a class="menu_sub"href="https://2009.igem.org/Team:Paris/Transduction_overview2_construction#bottom"> Construction</a>
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<a class="menu_sub_active"href="https://2009.igem.org/Team:Paris/Transduction_overview2_strategy#Our_strategy:_The_Fec_operon"> The Fec operon</a>|
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<a class="menu_sub" href="https://2009.igem.org/Team:Paris/Transduction_overview2_strategy#Our_strategy:_The_trick_TCS"> The trick TCS</a>
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===B.1 The Fec operon ===
 
Few ABC transporter such as FecABCD (iron transporter) are able to induce a response regardless of the tranlocation, due to the activity of FecA, moreover some mutant can also have a constitutive expression of FecABCD .
Few ABC transporter such as FecABCD (iron transporter) are able to induce a response regardless of the tranlocation, due to the activity of FecA, moreover some mutant can also have a constitutive expression of FecABCD .
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'''problems :''' the message is unidirectionnal and unrepeatable. It would just be a proof of principle that a vesicle-mediated controlled communication is possible.
'''problems :''' the message is unidirectionnal and unrepeatable. It would just be a proof of principle that a vesicle-mediated controlled communication is possible.
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===B.2 The trick TCS===
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==Our strategy: The trick TCS==
We could ,with the help of Alfonso Jaramillo, design a synthetic PBP which could detect the substrate we choosed and activate a specific HK.
We could ,with the help of Alfonso Jaramillo, design a synthetic PBP which could detect the substrate we choosed and activate a specific HK.
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Even if the idea of creating a synthethic protein was very attractive, it would have been difficult to have concrete result in just 3 months.
Even if the idea of creating a synthethic protein was very attractive, it would have been difficult to have concrete result in just 3 months.
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Latest revision as of 20:47, 21 October 2009

iGEM > Paris > Receiving the message > Our strategy




Our strategy: The Fec operon

Few ABC transporter such as FecABCD (iron transporter) are able to induce a response regardless of the tranlocation, due to the activity of FecA, moreover some mutant can also have a constitutive expression of FecABCD .


The plan would be to use FecA- mutant receiver and FecA+ mutant donor to transfert the constitutive FecA protein to the receiver. In this case the receiver will express the FecABCD operon without being induce by ferric citrate in the medium , and so we could place under the control of the Fec ABCD promoter, which is called pfec, the gene sequence encoding for the response. For the moment a response that would be easy to detect is the fluorescence of the RFP and the biobrick BBa-J61002 is the perfect candidate to test the system.


We also discovered that some fecR and fecI mutants can be use to amplify the signal because they have a constitutive activity. So we put under the control of pfec a FecR and FecI mutated. When they will be expressed, they will be activators of pfec and consequently of RFP. Normaly we would be able to obtain a increasing fluorescence.


fec operon induction


problems : the message is unidirectionnal and unrepeatable. It would just be a proof of principle that a vesicle-mediated controlled communication is possible.

Our strategy: The trick TCS

We could ,with the help of Alfonso Jaramillo, design a synthetic PBP which could detect the substrate we choosed and activate a specific HK. The previous work done by Valencia in 2006 was to design vanilin-sensitive PBP and a network for a graduated response whereas we just need a proteic sensitive PBP and a binary type of response.

Even if the idea of creating a synthethic protein was very attractive, it would have been difficult to have concrete result in just 3 months.


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