Difference between revisions of "Part:BBa K606025:Experience"
 
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==Characterization: Biobricked YFP:TetR==
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'''Parts construction''':<br>
 
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<h3>Characterization: Biobricked TetO Array's running way </h3>
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Origins of YFP:TetR are from pFX234 of D. Lane (Toulouse 2 University).
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<h4>Microscopy of double transformated pFX234 / Biobricked TetO Array <i>E. Coli</i></h4>
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<center><img src="https://static.igem.org/mediawiki/2011/c/cb/YFPtetR10.jpg">
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<p>Cloning plan of YFP:TetR construction</center></p>  
 
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<br><br>We characterize it with TetO Array from pDAG479 plasmid of F-X Barre and D. Lane (Kinetics of plasmid segregation, Molecular Microbiology, 2004).<br><br>
  
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In order to do this characterization, we took pictures of different plasmids containing only TetO; TetR + YFP; TetO + TetR + YFP. in each case we made a control by non inducing the promoter with arabinose in ''E. coli'' (double transformated with pFX234 and TetO Array).
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'''Microscopy of double transformed pDAG470 / Biobricked YFP:TetR in <i>E. Coli</i>:'''
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<p>To characterize this part properly, we took pictures of different strains containing YFP:TetR alone and both TetO array (from pDAG479, D.Lane) and expression YFP:TetR system (<partinfo>BBa_K606027</partinfo>).</p>
  
 
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{| border="1" class="wikitable" style="text-align: center;" align="center"
 
{| border="1" class="wikitable" style="text-align: center;" align="center"
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|+ tetO array : 37°C
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|+ Biobricked YFP:TetR only
 
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|[[Image:teto_minus_Fluo20.jpg|350px|thumb|center|tetO / TetO array inducted with no arabinose on E. Coli .]]
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|[[Image:yfptetrbb_trans.jpg|350px|thumb|center|Biobricked expression YFP:tetR system in E. coli.]]
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|[[Image:teto_arab_Fluo20.jpg|350px|thumb|center|tetO / TetO array inducted with 0,2% arabinose on E. Coli .]]
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|[[Image:yfptetrbb_Fluo2.jpg|350px|thumb|center|Biobricked expression YFP:tetR system in E. coli.]]
 
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{| border="1" class="wikitable" style="text-align: center;"
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{| border="1" class="wikitable" style="text-align: center;" align="center"
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|+tetR:YFP : 37°C
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|+ Biobricked YFP:TetR and TetO Array
 
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|[[Image:yfp_tetr_minus_fluo20.jpg|350px|thumb|center|tetR:YFP / TetR-YFP inducted with no arabinose on E. Coli .]]
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|[[Image:yfptetrbb_teto_trans.jpg|350px|thumb|center|Biobricked expression YFP:tetR system and TetO Array from D. Lane in E. coli.]]
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|[[Image:yfp_tetr_Arab_fluo20.jpg|350px|thumb|center|tetR:YFP / TetR-YFP inducted with 0,2% arabinose on E. Coli .]]
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|[[Image:yfptetrbb_teto__Fluo2.jpg|350px|thumb|center|Biobricked expression YFP:tetR system and TetO Array from D. Lane in E. coli.]]
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|}
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{| border="1" class="wikitable" style="text-align: center;"
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|+tetR:YFP / TetO array : 37°C
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|-
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|[[Image:yfp_tetr_teto_minus_fluo20_2s.jpg|350px|thumb|center|TetR:YFP-tetO/ full construct inducted with no arabinose on E. Coli .]]
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|[[Image:yfp_tetr_teto_Arab_fluo20_2-1.jpg|350px|thumb|center|TetR:YFP-tetO / full construct inducted with 0,2% arabinose on E. Coli .]]
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|}
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{| border="1" class="wikitable" style="text-align: center;"
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|+tetR:YFP and tetR:YFP / TetO array : 37°C - Zoom and comparison
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|[[Image:yfp_tetr_zoom.jpg|350px|thumb|center|TetR:YFP inducted with 0,2% arabinose on E. Coli .]]
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|[[Image:yfp_tetr_teto_zoom.jpg|350px|thumb|center|tetR:YFP-TetO / full construct inducted with 0,2% arabinose on E. Coli .]]
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|}
 
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</center>
  
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The pictures of TetO show no YFP activity, which is normal because there is no YFP sequence in these plasmids.<br>
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The TetR-YFP construct which (emitter part) occasionally shows gross aggregated YFP. <br>
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The TetR-YFP construct which constitutes the transmitter part, occasionally shows gross aggregated YFP. This is not what we expected at first, but that does not prevent us to characterize the full construct.<br>
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After observing the cells carrying both the TetO and YFP:TetR constructs, we can obviously distinguish glowing dots in some cells. They reflect the behavior we expected.
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After observing the full construct's pictures, we can obviously distinguish glowing dots in some cells. They reflect the behavior we expected. Indeed, appearance of dots (red arrow) shows that the receiver (TetO array) actually links tightly to TetR-YFP which is the emitted protein. Not all the dots are highlighted with red arrows but all are fluorescence loci !
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<h4>Microscopy of ibpA mCherry double transformated in <i>E. Coli</i></h4>
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We transformated ibpA mCherry cells (expressing a mcherry in a agregation chaperon protein, with courtesy of Anne-Sophie Coquel, Inserm U1001) with pFX234 YFP:TetR and biobricked TetO Array plasmids to differenciate TetO array foci than agregation.
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*Case of YFP:TetR over-expression by arabinose induction
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[[Image:microscopy_yfp_ibpa.jpg|center|]]
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Microscopy shows overlap for most foci and mCherry agregation but there are some foci that are alone indicating a  TetR-YFP/TetO binding activity.<br>
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Hopefully we don't expect to get high concentration of YFP:tetR in receiver cell so it will be ok.
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*Case of YFP:TetR low expression by arabinose induction
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<br>
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[[Image:microscopy_yfp_ibpa2.jpg|center|]]
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Microscopy shows that most of agregation are gone and we have more not-overlaping foci.<br> We could manage to get less agregation if we deal with the arabinose induction.<br>
 
  
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More information on : TetO Array characterization (<partinfo>BBa_K606026</partinfo>) and iGEM Paris Bettencourt 2011 wiki [http://2011.igem.org/Team:Paris_Bettencourt/Experiments/YFP_TetR_diffusion]
  
 
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Latest revision as of 16:28, 24 October 2011

Characterization: Biobricked YFP:TetR

Parts construction:
Origins of YFP:TetR are from pFX234 of D. Lane (Toulouse 2 University).

Cloning plan of YFP:TetR construction



We characterize it with TetO Array from pDAG479 plasmid of F-X Barre and D. Lane (Kinetics of plasmid segregation, Molecular Microbiology, 2004).

Microscopy of double transformed pDAG470 / Biobricked YFP:TetR in E. Coli:

To characterize this part properly, we took pictures of different strains containing YFP:TetR alone and both TetO array (from pDAG479, D.Lane) and expression YFP:TetR system (BBa_K606027).

Biobricked YFP:TetR only
Biobricked expression YFP:tetR system in E. coli.
Biobricked expression YFP:tetR system in E. coli.
Biobricked YFP:TetR and TetO Array
Biobricked expression YFP:tetR system and TetO Array from D. Lane in E. coli.
Biobricked expression YFP:tetR system and TetO Array from D. Lane in E. coli.

The TetR-YFP construct which (emitter part) occasionally shows gross aggregated YFP.
After observing the cells carrying both the TetO and YFP:TetR constructs, we can obviously distinguish glowing dots in some cells. They reflect the behavior we expected.


More information on : TetO Array characterization (BBa_K606026) and iGEM Paris Bettencourt 2011 wiki [http://2011.igem.org/Team:Paris_Bettencourt/Experiments/YFP_TetR_diffusion]

User Reviews

UNIQcbff0312d04bb313-partinfo-00000003-QINU UNIQcbff0312d04bb313-partinfo-00000004-QINU