Team:EPF-Lausanne/Our Project/Data

From 2011.igem.org

(Difference between revisions)
(→pSB3K1 Pconst-TetR)
(→Summary)
 
(129 intermediate revisions not shown)
Line 1: Line 1:
{{:Team:EPF-Lausanne/Templates/Header|title=Data}}
{{:Team:EPF-Lausanne/Templates/Header|title=Data}}
-
== TetR Mutants ==  
+
== Overview ==
-
* V36F
+
=== Summary ===
-
* P39K
+
-
* Y42F
+
-
* P39Q-Y42M
+
-
== T7 Promoter Plasmids ==
+
[[File:EPFL-Summary_drawing.png|right|thumb|250px]]
-
* pSB3K1-T7-const-RFP
+
Three components constitute our transcription factor development pipeline. The first is a selection system which lyses cells containing strong matches between a mutated transcription factor and its promoter and allows for the speedy recovery of the relevant DNA. The second component is an ''in vivo'' characterization system that uses two different reporter systems as a way to document the binding affinities of the TetR transcription factor and its promoter pTet. The third component is an ''in vitro'' characterization system called MITOMI that allows high-throughput quantitative analysis of DNA-protein interaction strengths.
-
''Description:'' The T7 promoter upstream of the RFP gene, set in the pSB3K1 backbone
+
In developing these three pillars, a number of parts were made. We have listed all of them here and have highlighted our favorites.
-
''Sequence:''
+
=== Systems ===
-
''Plasmid Map:''
+
'''Selection System''': We cloned the Berkeley Lysis cassette (BBa_K112808) under control of the T7 promoter into a low copy number plasmid (pSB3K1, formerly BBa_I739202).
-
''Saturation Curves:''
+
'''In Vivo Characterization''': We cloned an RFP gene under control of T7 promoter variants (parts BBa_K613001 through BBa_K613012) into a low copy number plasmid (pSB3K1, formerly BBa_I739202). We also cloned TetR mutants (parts BBa_K613013 through BBa_K613019) into a  a low copy number plasmid (pSB3K1, formerly BBa_I739202). Both sets of plasmids were thoroughly characterized using IPTG platereader experiments.
-
''Dose-Response Curves:''
+
'''In Vitro Characterization''': We characterized TetR mutants (parts BBa_K613013, BBa_K613015, BBa_K613016, BBa_K613017, BBa_K613019) in the low copy number plasmid pSB3K1 (formerly BBa_I739202).
 +
== Favourite parts ==
-
* pSB3K1-T7-lac-RFP
+
Our three favourite parts are TetR mutants, characterised ''in-vivo'' using our reporter systems, and ''in-vitro'' by MITOMI.
 +
* [http://partsregistry.org/Part:BBa_K613015 BBa_K613015] '''TetR E37A W43S T141A mutant'''
 +
* [http://partsregistry.org/Part:BBa_K613016 BBa_K613016] '''TetR P39K mutant'''
 +
* [http://partsregistry.org/Part:BBa_K613017 BBa_K613017] '''TetR Y42F mutant'''
-
* pSB3K1-T7-lac2-RFP
+
== Pre-existing parts characterised ==
 +
* [http://partsregistry.org/Part:BBa_K112808:Experience BBa_K112808 Experience Page] - '''The Berkeley Lysis Device''': In developing our Lysis selection device, we characterised induction, and ran proof-of-principle experiments.
-
* pSB3K1-T7-const-Lysis
+
== All other parts submitted ==
 +
=== TetR Mutants ===
-
* pSB3K1-T7-lac-Lysis
+
In addition to our three favourite tetR mutants, we created these four:
-
== T7 Promoter Variants ==
+
* [http://partsregistry.org/Part:BBa_K613013 K613013] '''V36F mutant'''
 +
* [http://partsregistry.org/Part:BBa_K613014 K613014] '''V36F W43S mutant'''
 +
* [http://partsregistry.org/Part:BBa_K613018 K613018] '''Y42F K108E mutant'''
 +
* [http://partsregistry.org/Part:BBa_K613019 K613019] '''P39Q Y42M mutant'''
-
== Reporter Plasmids ==
+
=== T7 Promoter variants ===
-
=== J61002 Ptet-RFP ===
+
We submitted a family of T7 promoters with varying strength. Our lysis selection device uses what we refer to as the wild-type (100% reported strength) T7 Promoter:
-
== TetR plasmids ==
+
* [http://partsregistry.org/Part:BBa_K613001 K613001] '''T7 Promoter''', 100% reported strength
-
=== pSB3K1 Pconst-TetR ===
+
In addition, we submitted the following mutants:
-
''Description''
+
Variants without additional lac operator (constitutive):
-
Parts assembled:
+
* [http://partsregistry.org/Part:BBa_K613002 BBa_K613002] '''T7 Promoter''', 14% reported strength
-
* Plasmid backbone: pSB3K1 from ETHZ 2007 [http://partsregistry.org/wiki/index.php?title=Part:pSB3K1 "pSB3K1"] (taken from the delivery plate)
+
* [http://partsregistry.org/Part:BBa_K613003 BBa_K613003] '''T7 Promoter''', 30% reported strength
-
* Pconst: J23116 from Berkeley 2006 [http://partsregistry.org/Part:BBa_J23116 "j23116"] (sequence copied into our primers)
+
* [http://partsregistry.org/Part:BBa_K613004 BBa_K613004] '''T7 Promoter''', 54% reported strength
-
* RBS (B0034?) and spacer: (sequence copied into our primers)
+
* [http://partsregistry.org/Part:BBa_K613005 BBa_K613005] '''T7 Promoter''', 80% reported strength
-
* TetR: [https://static.igem.org/mediawiki/2011/b/b0/EPFL_TetR_sequence.txt "TetR sequence"] (623 bp) The sequence lacks a stop codon, we added TAA with our primers
+
* [http://partsregistry.org/Part:BBa_K613006 BBa_K613006] '''T7 Promoter''', 111% reported strength
 +
Variants with additional lac operator (LacI repressed):
-
''Sequence''
+
* [http://partsregistry.org/Part:BBa_K613007 BBa_K613007] '''T7 Promoter, LacI repressed''', 100% reported strength
 +
* [http://partsregistry.org/Part:BBa_K613008 BBa_K613008] '''T7 Promoter, LacI repressed''', 14% reported strength
 +
* [http://partsregistry.org/Part:BBa_K613009 BBa_K613009] '''T7 Promoter, LacI repressed''', 30% reported strength
 +
* [http://partsregistry.org/Part:BBa_K613010 BBa_K613010] '''T7 Promoter, LacI repressed''', 54% reported strength
 +
* [http://partsregistry.org/Part:BBa_K613011 BBa_K613011] '''T7 Promoter, LacI repressed''', 80% reported strength
 +
* [http://partsregistry.org/Part:BBa_K613012 BBa_K613012] '''T7 Promoter, LacI repressed''', 111% reported strength
-
Sequenced data compared to the sequence of Pconst,RBS+spacer and TetR gene:[https://static.igem.org/mediawiki/2011/2/23/EPFL_pSb3K1_TetR_seq.txt "pSb3K1_TetR_seq"]
+
=== Medium-strength Plac ===
-
All these parts are correct.
+
 +
We submitted a new Plac promoter of medium strength. We characterized it with ATC inductions, using RFP as a readout.
 +
* [http://partsregistry.org/Part:BBa_K613000 BBa_K613000] '''pLac promoter''', medium strength
-
''Plasmid map''
 
-
 
-
[[File:EPFL_Tetr_plasmid.jpg‎|300px]]
 
-
 
-
 
-
''ATC induction''
 
-
 
-
The platereader experiment was run for 12h, using 0-0.1-5-25-200-300-800-1000-1200-1500 nM/ul final concentrations of ATC. The cells were cotransformed with pSB3K1 Pconst-TetR and J61002 Ptet-RFP, to use the fluorescent protein as a readout. All the concentrations were tested on 4 different cultures and the results were averaged.
 
-
 
-
On the left you can see the curve for each ATC concentration whereas on the right there is a comparison for the negative control and 800 ng/ul ATC.
 
-
[[File:EPFL_TimevsRFP_comp.jpg‎]]
 
-
 
-
''Dose-response''
 
-
These data are coming from the same experiment; they show the saturation value of RFP expression for each ATC concentration. Here again, the values were averaged over the 4 different cell cultures.
 
-
 
-
=== pSB3K1 Pconst-TetR Ptet-LacI ===
 
-
 
-
[[File:EPFL_TetR_plasmid_with_LacI.jpg‎|300px]]
 
-
 
-
Parts assembled
 
-
* Plasmid backbone containing Pconst and TetR: see precedent section
 
-
* Terminator: B0014 from the Registry [http://partsregistry.org/Part:BBa_B0014 "B0014"] (sequence copied into our primers)
 
-
* Ptet: R0040 from Registry [http://partsregistry.org/Part:BBa_R0040 "R0040"] (sequence copied into our primers)
 
-
* LacI: amplified from Repressilator plasmid [https://static.igem.org/mediawiki/2011/7/7f/EPFL_LacI_sequence.txt "LacI sequence"] The sequence lacks a stop codon, we added TAA with our primers.
 
-
 
-
 
-
Sequencing results:
 
{{:Team:EPF-Lausanne/Templates/Footer}}
{{:Team:EPF-Lausanne/Templates/Footer}}

Latest revision as of 22:05, 28 October 2011

Retrieved from "http://2011.igem.org/Team:EPF-Lausanne/Our_Project/Data"