Team:Purdue/Protocol

From 2012.igem.org

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{{Purdue_topbar}}
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{{Purdue_topbarProject}}
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== LB Agar ==
+
-
* We used a premade [http://www.bd.com/ Becton, Dickinson and Comapny] mix to make our [http://www.bd.com/ds/productCenter/244520.asp LB agar].
+
-
== Adding Antibiotics to LB ==
+
__NOTOC__
-
*How to make LB liquid plus antibiotics:
+
-
**Ampicillin – The frozen stock solutions of ampicillin are at 50mg/ml and 100mg/ml in H2O, and are marked with a red sticker.  The final concentration for LB liquid culture is 50ul/ml.  To obtain this in 100ml (the amount in each LB bottle), add 100ul stock solution.
+
-
**Kanamycin – The frozen stock solutions of kanamycin are at 50mg/ml in H2O, and are marked with green.  The final concentration for LB liquid culture for growing plasmids is 50ug/ml, and for cosmids is 20ug/ml.  To obtain 50ng/ml in 100ml of LB, add 100ul stock solution, and to obtain 20ug/ml, add 40ul stock solution.
+
-
**Tetracycline – The frozen stock solutions of tetracycline are at 15mg/ml in methanol and are marked with black.  The final concentration for LB liquid culture is 15ug/ml.  To obtain this in 100ml of LB, add 100ul stock solution.
+
-
**Chloramphenicol – The frozen stock solutions of chloramphenicol are at 25mg/ml in 100% ethanol and are marked with purple.  The final concentration for LB liquid culture is 25mg/ml.  To obtain this in 100ml of LB, add 100ul stock solution.
+
-
*How to make LB plates plus antibiotics:
+
<html>
-
**Follow the recipe card in box for making LB plates, being sure to add the agar.  After autoclaving, and when the agar has cooled enough that it’s not too hot to touch (about 1 to 1.5hrs), add antibiotics as follows:
+
-
**Ampicillin – add 1ml ampicillin (at 100mg/ml) per liter of agar to obtain a final concentration of 100ug/ml.  Mark the plate with a single red line on the side.
+
-
**Kanamycin – add 1ml kanamycin stock (at 50mg/ml) per liter of agar to obtain a final concentration of 50ug/ml.  Mark the plates with a single green line on the side.
+
-
**Tetracycline – add 1ml tetracycline stock (at 15mg/ml) per liter of agar to obtain a final concentration of 15ug/ml.  Mark the plates with a single black line on the side.
+
-
**Chloramphenicol – add 1ml chloramphenicol stock (at 25mg/ml) per liter of agar to obtain a final concentration of 100ug/ml.  Mark the plates with a single purple line on the side.
+
-
== SOB Media Recipe ==
+
<h1> LB Agar </h1>
-
* 2% w/v bacto-tryptone (20 g)
+
We used a premade <a href="http://www.bd.com/">Becton, Dickinson and Comapany</a> mix to make our <a href="http://www.bd.com/ds/productCenter/244520.asp">LB agar.</a>
-
* 0.5% w/v Yeast extract (5 g)
+
-
* 8.56mM NaCl (0.5 g) or 10mM NaCl (0.584 g)
+
-
* 2.5mM KCl (0.186 g)
+
-
* ddH2O to 1000 mL[4]
+
-
* For maximum effectiveness, SOB media should have its pH adjusted to 7.0 by adding concentrated sodium hydroxide.
+
<a name="Antibiotics"></a>
-
* Autoclave media to ensure sterility
+
<h1> Adding Antibiotics to LB </h1>
 +
How to make LB liquid plus antibiotics:
 +
<ul>
 +
<li>Ampicillin – The frozen stock solutions of ampicillin are at 50mg/ml and 100mg/ml in H2O, and are marked with a red sticker.   The final concentration for LB liquid culture is 50ul/ml. To obtain this in 100ml (the amount in each LB bottle), add 100ul stock solution. </li>
 +
<li>Kanamycin – The frozen stock solutions of kanamycin are at 50mg/ml in H2O, and are marked with green.  The final concentration for LB liquid culture for growing plasmids is 50ug/ml, and for cosmids is 20ug/ml.  To obtain 50ng/ml in 100ml of LB, add 100ul stock solution, and to obtain 20ug/ml, add 40ul stock solution. </li>
 +
<li>Tetracycline – The frozen stock solutions of tetracycline are at 15mg/ml in methanol and are marked with black.  The final concentration for LB liquid culture is 15ug/ml.  To obtain this in 100ml of LB, add 100ul stock solution. </li>
 +
<li>Chloramphenicol – The frozen stock solutions of chloramphenicol are at 25mg/ml in 100% ethanol and are marked with purple.  The final concentration for LB liquid culture is 25mg/ml.  To obtain this in 100ml of LB, add 100ul stock solution. </li>
 +
</ul>
-
== SOC Media Recipe ==
 
-
In addition to the contents of [[#SOB Media Recipe| SOB media]]
 
-
* 10mM MgCl2 (0.952 g) or 20mM MgSO4 (2.408 g)[2]
 
-
* 20mM glucose (3.603 g)
 
-
* Alternatively, SOC can be made by adding small amounts of concentrated magnesium chloride and glucose solutions to pre-prepared SOB.
 
-
* For maximum effectiveness, SOC media should have its pH adjusted to 7.0 by adding concentrated sodium hydroxide.
+
How to make LB plates plus antibiotics:
-
* Autoclave media to ensure sterility
+
<ul>
 +
<li>Follow the recipe card in box for making LB plates, being sure to add the agar. After autoclaving, and when the agar has cooled enough that it’s not too hot to touch (about 1 to 1.5hrs), add antibiotics as follows: </li>
 +
<ul>
 +
<li>Ampicillin – add 1ml ampicillin (at 100mg/ml) per liter of agar to obtain a final concentration of 100ug/ml.  Mark the plate with a single red line on the side. </li>
 +
<li>Kanamycin – add 1ml kanamycin stock (at 50mg/ml) per liter of agar to obtain a final concentration of 50ug/ml.  Mark the plates with a single green line on the side. </li>
 +
<li>Tetracycline – add 1ml tetracycline stock (at 15mg/ml) per liter of agar to obtain a final concentration of 15ug/ml.  Mark the plates with a single black line on the side.  </li>
 +
<li>Chloramphenicol – add 1ml chloramphenicol stock (at 25mg/ml) per liter of agar to obtain a final concentration of 100ug/ml.  Mark the plates with a single purple line on the side. </li>
 +
</ul>
 +
</ul>
-
== Creating Chemically Competent Cells ==
+
<a name="SOB"></a>
-
* The protocol for creating chemically competent cells is provided by the parts registry and can be found [http://partsregistry.org/Help:Protocols/Competent_Cells here].
+
<h1>SOB Media Recipe</h1>
 +
<ul>
 +
<li> 2% w/v bacto-tryptone (20 g)</li>
 +
<li> 0.5% w/v Yeast extract (5 g)</li>
 +
<li> 8.56mM NaCl (0.5 g) or 10mM NaCl (0.584 g) </li>
 +
<li> 2.5mM KCl (0.186 g) </li>
 +
<li> ddH2O to 1000 mL[4] </li>
 +
</ul>
-
== Transforming Chemically Competent Cells ==
+
For maximum effectiveness, SOB media should have its pH adjusted to 7.0 by adding concentrated sodium hydroxide.
-
* The protocol for transforming chemically competent cells is provided by Open Wet Ware and can be found [http://openwetware.org/wiki/Transforming_chemically_competent_cells here].
+
Autoclave media to ensure sterility
-
== Miniprep Procedures ==
+
<h1> SOC Media Recipe </h1>
-
* For this procedure, we used the [http://www.qiagen.com/products/plasmid/qiaprepminiprepsystem/qiaprepspinminiprepkit.aspx#Tabs=t0 QIAprep Spin Miniprep Kit] by [http://www.qiagen.com/default.aspx Qiagen].
+
In addition to the contents of <a href="https://2012.igem.org/Team:Purdue/Protocol#SOB">SOB media</a>
-
=== Original Miniprep Procedure ===
+
<ul>
-
# Add 1.5mL of overnight culture to a micorcentrifuge tube
+
<li>10mM MgCl2 (0.952 g) or 20mM MgSO4 (2.408 g)[2] </li>
-
# Spin for 3 minutes at 800rpm
+
<li>20mM glucose (3.603 g) </li>
-
# Decant the supernatant so that the DNA pellet is all that remains
+
<li>Alternatively, SOC can be made by adding small amounts of concentrated magnesium chloride and glucose solutions to pre-prepared SOB. </li>
-
# Repeat steps 1-3 three times
+
</ul>
-
# Add 250μL of buffer P2 and invert several times to mix (do not allow the solution to sit for more than 5 minutes)
+
-
# Add 300μL of buffer N3 and immediately invert to mix
+
-
# Centrifuge at 13,000rpm for 10 minutes
+
-
# Apply the supernatant to the QIAprep spin column by decanting or pipetting
+
-
# Centrifuge at 13,000rpm for 1 minute and discard flow through
+
-
# Wash the QIAprep spin column by adding 500μL buffer PB
+
-
# Centrifuge at 13,000rpm for 1 minute and discard flow through
+
-
# Wash the QIAprep spin column by adding 750μL Buffer PE
+
-
# Centrifuge at 13,000rpm for 1 minute and discard flow through
+
-
# Centrifuge at 13,000rpm for 1 minute
+
-
# Place the QIAprep column in a clean 1.5mL microcentrifuge tube
+
-
# Elute the DNA by adding 50μL of Buffer EB to the center of the QIAprep spin column
+
-
# Let stand for 1 minute
+
-
# Quantify DNA concentration with nanodrop
+
-
=== Alterations to Miniprep Procedure (as of June 19) ===
+
For maximum effectiveness, SOC media should have its pH adjusted to 7.0 by adding concentrated sodium hydroxide.
-
# The P2 and N3 steps (steps 5 and 6) were done twice
+
Autoclave media to ensure sterility
-
# The final elution (step 16) was completed using 50°C nanopure water
+
-
== PCR protocol ==
+
<h1> Creating Chemically Competent Cells </h1>
-
# For a 25ul rxn:
+
The protocol for creating chemically competent cells is provided by the parts registry and can be found <a hef="http://partsregistry.org/Help:Protocols/Competent_Cells">here.</a>
-
#* Use 1ul of 60ng/ul or 100ng/ul DNA
+
-
#* Use 1ul of each primer at 3.2pmole/ul concentration or 1.25ul of each primer at 100ng/ul concentration
+
-
#* 2.5ul 10x PCR Buffer w/ Mg (1.5mM)
+
-
#* 0.5ul 25mM MgCl2
+
-
#* 0.5ul dNTP
+
-
#* 0.125ul Taq
+
-
#* 18.375ul sterile water to equal a 25ul rxn
+
-
#* if not making master mix, dilute Taq so that you can add 1ul of Taq and 17.5ul sterile water to equal a 25ul rxn         
+
-
# For a 50ul rxn:
+
-
#* Use 2ul of 60ng/ul or 100ng/ul DNA
+
-
#* Use 2ul of each primer at 3.2pmole/ul concentration or 2.5ul of each primer at 100ng/ul concentration
+
-
#* 5ul 10x PCR Buffer w/ Mg
+
-
#* 1ul 25mM MgCl2
+
-
#* 1ul dNTP
+
-
#* 0.25ul Taq
+
-
#* 36.75ul sterile water to equal a 50ul rxn
+
-
#* if not making a master mix, dilute Taq so that you can add 1ul of Taq and 36ul sterile water to equal a 50ul rxn
+
-
# Keep the reagents on ice.
+
-
# Add the Taq last, and keep it in the freezer until you are ready to add it.
+
-
# Vortex briefly and quick spin.
+
-
# Cycle:
+
-
#* 95°C for 1-5minutes (usually 4min)
+
-
#* 95°C for 1min
+
-
#* 55°C for 1min. Cycle 30 times
+
-
#* 72°C for 1.5 to 2min (usually 2min)
+
-
#* 72°C for 10min
+
-
#* 4°C hold
+
-
* A video showing the theory behind PCR can he found [http://www.youtube.com/watch?v=HMC7c2T8fVk&feature=fvwrel| here]
+
<h1>Transforming Chemically Competent Cells</h1>
 +
The protocol for transforming chemically competent cells is provided by Open Wet Ware and can be found <a href="http://openwetware.org/wiki/Transforming_chemically_competent_cells">here.</a>
-
== 3A Assembly ==
+
<a name="UpdatedTransformation"></a>
-
* The protocol for 3A assembly is provided by Open Wet Ware and can be found [http://openwetware.org/wiki/Synthetic_Biology:BioBricks/3A_assembly here]
+
<h3> Updated Protocol for Transforming Chemically Competent Cells (as of 6/20)</h3>
 +
Due to our low yield from our previous transformations and minipreps, we are now using the following protocol.
 +
<ol>
 +
<li> Thaw cells on ice ( the cells must be kept on ice as much as possible to work properly)</li>
 +
<li> Gently mix approximately 25μL of cells into chilled polypropylene tube (if ligation then 50μL) </li>
 +
<li> Add 1.25μL or less plasmid DNA </li>
 +
<li> Swirl and flick with finger </li>
 +
<li> Heat shock at 42°C for approximately 45 seconds (no shaking)</li>
 +
<li> Put tubes back on ice for 2-5 minutes </li>
 +
<li> Add 900μL of SOC </li>
 +
<li> Gently shake and incubate at 200 rpm for 30-60 minutes at 37°C </li>
 +
<li> Spread on LB plates </li>
 +
<li> Place in 37°C for 14 hours </li>
 +
</ol>
-
== Gibson Assembly ==
+
<a name="Tarun"></a>
-
Prepare a master mix, as detailed below. Store them in 15 ul aliquots at -20 °C. Then:
+
<h3> Tarun's Transformation Protocol (used 6/21) </h3>
 +
<ol>
 +
<li> Warm cells on ice and by holding </li>
 +
<li> Shake cells for several seconds </li>
 +
<li> Place 1μL of DNA on the side of the cell tube </li>
 +
<li> Obtain 25μL of cells </li>
 +
<li> Place cells on the side of the tube where the DNA is and mix by pipettor </li>
 +
When getting cells out of the container, pipette up and down to mix cells before adding to the tube
 +
<li> Flick the tube with a finger to mic and place the tube back on ice </li>
 +
<li> Let the tube sit on ice for 20-30 minutes </li>
 +
<li> Heat shock the cells at 42°C for 40 seconds </li>
 +
<li> Put the cells on ice for 2 minutes </li>
 +
<li> Shake the cells at 37°C for 8 hours </li>
 +
</ol>
-
# Thaw a 15 μl assembly mixture aliquot and keep on ice until ready to be used.
+
<a name="Miniprep"></a>
-
# Add 5 μl of DNA to be assembled to the master mixture. The DNA should be in equimolar amounts. Use 10-100 ng of each ~6 kb DNA fragment. For larger DNA segments, increasingly proportionate amounts of DNA should be added (e.g. 250 ng of each 150 kb DNA segment).
+
<h1> Miniprep Procedures </h1>
-
# Incubate at 50 °C for 15 to 60 min (60 min is optimal).
+
For this procedure, we used the <a href="http://www.qiagen.com/products/plasmid/qiaprepminiprepsystem/qiaprepspinminiprepkit.aspx#Tabs=t0">QIAprep Spin Miniprep Kit</a> by <a href="http://www.qiagen.com/default.aspx">Qiagen.</a>
-
# [http://openwetware.org/wiki/Transforming_chemically_competent_cells Transform] as usual
+
<h3> Original Miniprep Procedure </h3>
 +
<ol>
 +
<li> Add 1.5mL of overnight culture to a micorcentrifuge tube </li>
 +
<li> Spin for 3 minutes at 800rpm </li>
 +
<li> Decant the supernatant so that the DNA pellet is all that remains </li>
 +
<li> Repeat steps 1-3 three times </li>
 +
<li> Add 250μL of buffer P2 and invert several times to mix (do not allow the solution to sit for more than 5 minutes)</li>
 +
<li> Add 300μL of buffer N3 and immediately invert to mix </li>
 +
<li> Centrifuge at 13,000rpm for 10 minutes </li>
 +
<li> Apply the supernatant to the QIAprep spin column by decanting or pipetting </li>
 +
<li> Centrifuge at 13,000rpm for 1 minute and discard flow through </li>
 +
<li> Wash the QIAprep spin column by adding 500μL buffer PB </li>
 +
<li> Centrifuge at 13,000rpm for 1 minute and discard flow through </li>
 +
<li> Wash the QIAprep spin column by adding 750μL Buffer PE  </li>
 +
<li> Centrifuge at 13,000rpm for 1 minute and discard flow through </li>
 +
<li> Centrifuge at 13,000rpm for 1 minute </li>
 +
<li> Place the QIAprep column in a clean 1.5mL microcentrifuge tube </li>
 +
<li> Elute the DNA by adding 50μL of Buffer EB to the center of the QIAprep spin column </li>
 +
<li> Let stand for 1 minute </li>
 +
<li> Quantify DNA concentration with nanodrop </li>
 +
</ol>
-
* The protocol for Gibson assembly is provided by Open Wet Ware
+
<h3>Alterations to Miniprep Procedure (as of June 19) </h3>
-
* The original paper for the Gibson assembly protocol can be found [http://www.nature.com/nmeth/journal/v6/n5/full/nmeth.1318.html here]
+
<ol>
 +
<li> The P2 and N3 steps (steps 5 and 6) were done twice </li>
 +
<li> The final elution (step 16) was completed using 50°C nanopure water </li>
 +
</ol>
-
== Silica Creation ==
+
<a name="PCR"></a>
-
# Obtain 14.4g of nanopure water
+
<h1> PCR protocol </h1>
-
# Obtain 50µL of .04M HCL and combine it with the water. Put this solution in an ice bath
+
We used a PCR mastermix provided by <a href="http://www.5prime.com/">5 Prime </a>. The components of the mastermix are as follows:
-
# Obtain 7.6g of tetramethyl orthosilicate (TMOS) in a separate container
+
<ul>
-
# Combine the TMOS and HCL/water
+
<li> Taq DNA Polymerase (62.5 U/ml)</li>
-
# Immediately begin the vortex the solution. The solution will be cloudy while the reaction is taking place. Once the solution is clear again, the reaction is finished. This will take approximately 5 minutes
+
<li> 2.5x Taq reaction buffer (with 125 mM KCl, 75 mM Tris-HCl pH 8.3, 4 mM Mg2+, 0.5% Igepal®-CA630) </li>
-
# When the reaction is finished, let the solution set for 1-2 minutes
+
<li> 500 µM each of dNTP </li>
-
# Use a rotary evaporator at 47ºC to remove the methane from the solution. This should take 2-3 minutes. The final solution volume should be approximately 13mL
+
<li> stabilizers </li>
-
# If the silica is to be used immediately, put it on ice. It can be stored for up to a week if it is refrigerated.  
+
</ul>
-
# Filter the silica before use
+
The full manual for the mastermix can be found <a href="http://www.5prime.com/media/3352/5%20prime%20mastermix%20manual_5prime_1044358_032007.pdf">here </a>. The procedures we used are described below.
-
* The procedures are provided by Rickus lab group.
+
 
 +
<ol>
 +
<li> Add 1ul of 100-200nM of the foward and reverse primer to a .2ml tube </li>
 +
<li> Add 10-200ng of the template DNA to the .2ml tube </li>
 +
<li> Adjust the final volume to 15μL (for a 25μL reaction) or 30μL (for a 50μL reaction) with nanopure water </li>
 +
<li> Add 10μL (for a 25μL) reaction or 20μL (for a 50μL reaction) of mastermix to a PCR tube </li>
 +
<li> Add the template DNA/primer mix to the PCR tube, close the tube, and mix well. Avoid foaming. If necessary, centrifuge briefly and place the tube on ice. </li>
 +
<li>Cycle: </li>
 +
<ol>
 +
<li>95°C for 1-5minutes (usually 4min) </li>
 +
<li>95°C for 1min </li>
 +
<li>55°C for 1min. Cycle 30 times </li>
 +
<li>72°C for 1.5 to 2min (usually 2min) </li>
 +
<li>72°C for 10min </li>
 +
<li>4°C hold </li>
 +
</ol>
 +
</ol>
 +
<br>
 +
A video showing the theory behind PCR can he found <a href="http://www.youtube.com/watch?v=HMC7c2T8fVk&feature=fvwrel">here</a>
 +
 
 +
 
 +
<h1>3A Assembly </h1>
 +
The protocol for 3A assembly is provided by Open Wet Ware and can be found <a href="http://openwetware.org/wiki/Synthetic_Biology:BioBricks/3A_assembly">here</a>
 +
 
 +
 
 +
<h1>Gibson Assembly</h1>
 +
Prepare a master mix, as detailed below.
 +
<ul>
 +
<li> 320 μL 5X Isothermal Master Mix (recipe below) </li>
 +
<li> 0.64 μL 10 U/μL T5 exonuclease </li>
 +
<li> 20 μL 2 U/μL Phusion DNA Pol </li>
 +
<li> 0.16 μL 40 000 U/μL Taq DNA Ligase </li>
 +
<li> 860 μL ddH2O </li>
 +
<li> 1.2 ml Total </li>
 +
</ul>
 +
<br>
 +
 
 +
Prather Recipe 5x Isothermal Reaction Mix: 
 +
<ul>
 +
<li> 3 ml 1 M Tris-Hcl (pH 7.5) </li>
 +
<li> 300 μL 1 M MgCl2 </li>
 +
<li> 60 μL 100 mM dGTP </li>
 +
<li> 60 μL 100 mM dATP </li>
 +
<li> 60 μL 100 mM dTTP </li>
 +
<li> 60 μL 100 mM dCTP </li>
 +
<li> 300 μL 1 M DTT </li>
 +
<li> 1.5 g PEG-8000 </li>
 +
<li> 300 μL 100 mM NAD </li>
 +
<li> balance ddH2O </li>
 +
<li> 6 ml Total </li>
 +
</ul>
 +
<br>
 +
 
 +
Store the master mix in 15 ul aliquots at -20 °C. Then:
 +
<ol>
 +
<li> <a href="https://2012.igem.org/Team:Purdue/Protocol#PCR">PCR</a> up your fragments of choice and gel purify </li>
 +
<li> Thaw a 15 μl assembly mixture aliquot and keep on ice until ready to be used. </li>
 +
<li> Add 5 μl of DNA to be assembled to the master mixture. The DNA should be in equimolar amounts. Use 10-100 ng of each ~6 kb DNA fragment. For larger DNA segments, increasingly proportionate amounts of DNA should be added (e.g. 250 ng of each 150 kb DNA segment).</li>
 +
<li> Incubate at 50 °C for 15 to 60 min (60 min is optimal). </li>
 +
<li> <a href="http://openwetware.org/wiki/Transforming_chemically_competent_cells">Transform</a> as usual </li>
 +
</ol>
 +
 
 +
The protocol for Gibson assembly is provided by Open Wet Ware
 +
The original paper for the Gibson assembly protocol can be found <a href="http://www.nature.com/nmeth/journal/v6/n5/full/nmeth.1318.html">here</a>
 +
 
 +
<a name="Silica"></a>
 +
<h1> Silica Creation </h1>
 +
<ol>
 +
<li> Obtain 14.4g of nanopure water </li>
 +
<li> Obtain 50µL of .04M HCL and combine it with the water. Put this solution in an ice bath </li>
 +
<li> Obtain 7.6g of tetramethyl orthosilicate (TMOS) in a separate container </li>
 +
<li> Combine the TMOS and HCL/water </li>
 +
<li> Immediately begin the vortex the solution. The solution will be cloudy while the reaction is taking place. Once the solution is clear again, the reaction is finished. This will take approximately 5 minutes </li>
 +
<li> When the reaction is finished, let the solution set for 1-2 minutes </li>
 +
<li> Use a rotary evaporator at 47ºC to remove the methane from the solution. This should take 2-3 minutes. The final  solution volume should be approximately 13mL </li>
 +
<li> If the silica is to be used immediately, put it on ice. It can be stored for up to a week if it is refrigerated. </li>
 +
<li> Filter the silica before use </li>
 +
</ol>
 +
The procedures are provided by Rickus lab group.
 +
 
 +
<a name="Stationary Phase"></a>
 +
<h1> Growth Rate Assay </h1>
 +
<ol>
 +
<li> Measure out 5mL of SOB media into 7 culture tubes </li>
 +
<li> Add 5uL of NEB to 3 of the tubes and label </li>
 +
<li> Add 5uL of DH5 to 3 of the tubes and label </li>
 +
<li> Do not add anything to the last tube to keep as a blank </li>
 +
<li> Place the culture tubes in an incubator for 1 hr </li>
 +
<li> Record the OD after an hour </li>
 +
<li> Check and record the OD for every hour until the OD starts to double, then check ever 30 minutes </li>
 +
<li> Record all data </li>
 +
</ol>
 +
 
 +
 
 +
<a name="Static Biofilm"></a>
 +
<h1> Static Biofilm Assay </h1>
 +
<ol>
 +
<li> Grow the E.coli to stationary phase </li>
 +
<li> Dilute bacteria to 1:100 with SOB media </li>
 +
<li> Place 200uL of the culture samples in each well making sure to do triplicates of each dilution and a control well </li>
 +
<li> Set up duplicats of the plates for each time interval needed</li>
 +
<li> Set up trays:
 +
<ul>
 +
<li> 1st tray - No water, used to collect waste</li>
 +
<li> 2nd tray - Fill 1 to 2 inches of tap water, used to wash out bacteria</li>
 +
<li> 3rd and 4th tray - Also filled with 1 to 2 inches of water, used to wash off the trays when the wells have been stained</li>
 +
</ul> </li>
 +
<li> After growing for the given time intervals, remove platonic cells by shaking the plate over the waste tray and submerging it and shaking it over the 2nd tray.</li>
 +
<li> Add125uL of 0.1% crystal violet solution to each well and allow to sit for 10 minutes</li>
 +
<li> Wash out the stain with trays 3 and 4 </li>
 +
<li> Add 200uL of 80% ethanol/20% acetone to each well and let sit at room temperature for 10-15 minutes </li>
 +
<li> Mix the wells by pipetting </li>
 +
<li> Transfer 125 uL to a container that can be used to measure OD </li>
 +
<li> Measure the OD and record results </li>
 +
</ol>
 +
 
 +
<a name="M9"></a>
 +
<h1>M9 Minimal Media Recipe</h1>
 +
Make M9 salts:
 +
<ul>
 +
<li> Aliquet 200 mL H2 and add: </li>
 +
<ul>
 +
<li> 6 g Na2HPO4 * 7H20 </li>
 +
<li> 3 g KH2PO4 </li>
 +
<li> 0.5 g NaCl </li>
 +
<li> 1.0 g NH4Cl </li>
 +
</ul>
 +
<li> Stir until dissolved </li>
 +
<li>Adjust to 1000 mL with distilled H20 </li>
 +
<li> Autoclave </li>
 +
</ul>
 +
 
 +
Media:
 +
<ul>
 +
<li> Measure approximately 700 mL of sterile H20 </li>
 +
<li> Add 200 mL of M9 salts </li>
 +
<li> Add 2 mL of 1 M MgSO4 (sterile) (.24 g) </li>
 +
<li> Add 20 mL of 20% glucose </li>
 +
<li> Add 100 microliters of 1 M CaCl (sterile) </li>
 +
<li> Adjust to 1000 mL with sterile H20 </li>
 +
</ul>
 +
 
 +
 
 +
</html>

Latest revision as of 15:45, 21 October 2012


LB Agar

We used a premade Becton, Dickinson and Comapany mix to make our LB agar.

Adding Antibiotics to LB

How to make LB liquid plus antibiotics:
  • Ampicillin – The frozen stock solutions of ampicillin are at 50mg/ml and 100mg/ml in H2O, and are marked with a red sticker. The final concentration for LB liquid culture is 50ul/ml. To obtain this in 100ml (the amount in each LB bottle), add 100ul stock solution.
  • Kanamycin – The frozen stock solutions of kanamycin are at 50mg/ml in H2O, and are marked with green. The final concentration for LB liquid culture for growing plasmids is 50ug/ml, and for cosmids is 20ug/ml. To obtain 50ng/ml in 100ml of LB, add 100ul stock solution, and to obtain 20ug/ml, add 40ul stock solution.
  • Tetracycline – The frozen stock solutions of tetracycline are at 15mg/ml in methanol and are marked with black. The final concentration for LB liquid culture is 15ug/ml. To obtain this in 100ml of LB, add 100ul stock solution.
  • Chloramphenicol – The frozen stock solutions of chloramphenicol are at 25mg/ml in 100% ethanol and are marked with purple. The final concentration for LB liquid culture is 25mg/ml. To obtain this in 100ml of LB, add 100ul stock solution.
How to make LB plates plus antibiotics:
  • Follow the recipe card in box for making LB plates, being sure to add the agar. After autoclaving, and when the agar has cooled enough that it’s not too hot to touch (about 1 to 1.5hrs), add antibiotics as follows:
    • Ampicillin – add 1ml ampicillin (at 100mg/ml) per liter of agar to obtain a final concentration of 100ug/ml. Mark the plate with a single red line on the side.
    • Kanamycin – add 1ml kanamycin stock (at 50mg/ml) per liter of agar to obtain a final concentration of 50ug/ml. Mark the plates with a single green line on the side.
    • Tetracycline – add 1ml tetracycline stock (at 15mg/ml) per liter of agar to obtain a final concentration of 15ug/ml. Mark the plates with a single black line on the side.
    • Chloramphenicol – add 1ml chloramphenicol stock (at 25mg/ml) per liter of agar to obtain a final concentration of 100ug/ml. Mark the plates with a single purple line on the side.

SOB Media Recipe

  • 2% w/v bacto-tryptone (20 g)
  • 0.5% w/v Yeast extract (5 g)
  • 8.56mM NaCl (0.5 g) or 10mM NaCl (0.584 g)
  • 2.5mM KCl (0.186 g)
  • ddH2O to 1000 mL[4]
For maximum effectiveness, SOB media should have its pH adjusted to 7.0 by adding concentrated sodium hydroxide. Autoclave media to ensure sterility

SOC Media Recipe

In addition to the contents of SOB media
  • 10mM MgCl2 (0.952 g) or 20mM MgSO4 (2.408 g)[2]
  • 20mM glucose (3.603 g)
  • Alternatively, SOC can be made by adding small amounts of concentrated magnesium chloride and glucose solutions to pre-prepared SOB.
For maximum effectiveness, SOC media should have its pH adjusted to 7.0 by adding concentrated sodium hydroxide. Autoclave media to ensure sterility

Creating Chemically Competent Cells

The protocol for creating chemically competent cells is provided by the parts registry and can be found here.

Transforming Chemically Competent Cells

The protocol for transforming chemically competent cells is provided by Open Wet Ware and can be found here.

Updated Protocol for Transforming Chemically Competent Cells (as of 6/20)

Due to our low yield from our previous transformations and minipreps, we are now using the following protocol.
  1. Thaw cells on ice ( the cells must be kept on ice as much as possible to work properly)
  2. Gently mix approximately 25μL of cells into chilled polypropylene tube (if ligation then 50μL)
  3. Add 1.25μL or less plasmid DNA
  4. Swirl and flick with finger
  5. Heat shock at 42°C for approximately 45 seconds (no shaking)
  6. Put tubes back on ice for 2-5 minutes
  7. Add 900μL of SOC
  8. Gently shake and incubate at 200 rpm for 30-60 minutes at 37°C
  9. Spread on LB plates
  10. Place in 37°C for 14 hours

Tarun's Transformation Protocol (used 6/21)

  1. Warm cells on ice and by holding
  2. Shake cells for several seconds
  3. Place 1μL of DNA on the side of the cell tube
  4. Obtain 25μL of cells
  5. Place cells on the side of the tube where the DNA is and mix by pipettor
    6. When getting cells out of the container, pipette up and down to mix cells before adding to the tube
  6. Flick the tube with a finger to mic and place the tube back on ice
  7. Let the tube sit on ice for 20-30 minutes
  8. Heat shock the cells at 42°C for 40 seconds
  9. Put the cells on ice for 2 minutes
  10. Shake the cells at 37°C for 8 hours

Miniprep Procedures

For this procedure, we used the QIAprep Spin Miniprep Kit by Qiagen.

Original Miniprep Procedure

  1. Add 1.5mL of overnight culture to a micorcentrifuge tube
  2. Spin for 3 minutes at 800rpm
  3. Decant the supernatant so that the DNA pellet is all that remains
  4. Repeat steps 1-3 three times
  5. Add 250μL of buffer P2 and invert several times to mix (do not allow the solution to sit for more than 5 minutes)
  6. Add 300μL of buffer N3 and immediately invert to mix
  7. Centrifuge at 13,000rpm for 10 minutes
  8. Apply the supernatant to the QIAprep spin column by decanting or pipetting
  9. Centrifuge at 13,000rpm for 1 minute and discard flow through
  10. Wash the QIAprep spin column by adding 500μL buffer PB
  11. Centrifuge at 13,000rpm for 1 minute and discard flow through
  12. Wash the QIAprep spin column by adding 750μL Buffer PE
  13. Centrifuge at 13,000rpm for 1 minute and discard flow through
  14. Centrifuge at 13,000rpm for 1 minute
  15. Place the QIAprep column in a clean 1.5mL microcentrifuge tube
  16. Elute the DNA by adding 50μL of Buffer EB to the center of the QIAprep spin column
  17. Let stand for 1 minute
  18. Quantify DNA concentration with nanodrop

Alterations to Miniprep Procedure (as of June 19)

  1. The P2 and N3 steps (steps 5 and 6) were done twice
  2. The final elution (step 16) was completed using 50°C nanopure water

PCR protocol

We used a PCR mastermix provided by 5 Prime . The components of the mastermix are as follows:
  • Taq DNA Polymerase (62.5 U/ml)
  • 2.5x Taq reaction buffer (with 125 mM KCl, 75 mM Tris-HCl pH 8.3, 4 mM Mg2+, 0.5% Igepal®-CA630)
  • 500 µM each of dNTP
  • stabilizers
The full manual for the mastermix can be found here . The procedures we used are described below.
  1. Add 1ul of 100-200nM of the foward and reverse primer to a .2ml tube
  2. Add 10-200ng of the template DNA to the .2ml tube
  3. Adjust the final volume to 15μL (for a 25μL reaction) or 30μL (for a 50μL reaction) with nanopure water
  4. Add 10μL (for a 25μL) reaction or 20μL (for a 50μL reaction) of mastermix to a PCR tube
  5. Add the template DNA/primer mix to the PCR tube, close the tube, and mix well. Avoid foaming. If necessary, centrifuge briefly and place the tube on ice.
  6. Cycle:
    1. 95°C for 1-5minutes (usually 4min)
    2. 95°C for 1min
    3. 55°C for 1min. Cycle 30 times
    4. 72°C for 1.5 to 2min (usually 2min)
    5. 72°C for 10min
    6. 4°C hold

A video showing the theory behind PCR can he found here

3A Assembly

The protocol for 3A assembly is provided by Open Wet Ware and can be found here

Gibson Assembly

Prepare a master mix, as detailed below.
  • 320 μL 5X Isothermal Master Mix (recipe below)
  • 0.64 μL 10 U/μL T5 exonuclease
  • 20 μL 2 U/μL Phusion DNA Pol
  • 0.16 μL 40 000 U/μL Taq DNA Ligase
  • 860 μL ddH2O
  • 1.2 ml Total

Prather Recipe 5x Isothermal Reaction Mix:
  • 3 ml 1 M Tris-Hcl (pH 7.5)
  • 300 μL 1 M MgCl2
  • 60 μL 100 mM dGTP
  • 60 μL 100 mM dATP
  • 60 μL 100 mM dTTP
  • 60 μL 100 mM dCTP
  • 300 μL 1 M DTT
  • 1.5 g PEG-8000
  • 300 μL 100 mM NAD
  • balance ddH2O
  • 6 ml Total

Store the master mix in 15 ul aliquots at -20 °C. Then:
  1. PCR up your fragments of choice and gel purify
  2. Thaw a 15 μl assembly mixture aliquot and keep on ice until ready to be used.
  3. Add 5 μl of DNA to be assembled to the master mixture. The DNA should be in equimolar amounts. Use 10-100 ng of each ~6 kb DNA fragment. For larger DNA segments, increasingly proportionate amounts of DNA should be added (e.g. 250 ng of each 150 kb DNA segment).
  4. Incubate at 50 °C for 15 to 60 min (60 min is optimal).
  5. Transform as usual
The protocol for Gibson assembly is provided by Open Wet Ware The original paper for the Gibson assembly protocol can be found here

Silica Creation

  1. Obtain 14.4g of nanopure water
  2. Obtain 50µL of .04M HCL and combine it with the water. Put this solution in an ice bath
  3. Obtain 7.6g of tetramethyl orthosilicate (TMOS) in a separate container
  4. Combine the TMOS and HCL/water
  5. Immediately begin the vortex the solution. The solution will be cloudy while the reaction is taking place. Once the solution is clear again, the reaction is finished. This will take approximately 5 minutes
  6. When the reaction is finished, let the solution set for 1-2 minutes
  7. Use a rotary evaporator at 47ºC to remove the methane from the solution. This should take 2-3 minutes. The final solution volume should be approximately 13mL
  8. If the silica is to be used immediately, put it on ice. It can be stored for up to a week if it is refrigerated.
  9. Filter the silica before use
The procedures are provided by Rickus lab group.

Growth Rate Assay

  1. Measure out 5mL of SOB media into 7 culture tubes
  2. Add 5uL of NEB to 3 of the tubes and label
  3. Add 5uL of DH5 to 3 of the tubes and label
  4. Do not add anything to the last tube to keep as a blank
  5. Place the culture tubes in an incubator for 1 hr
  6. Record the OD after an hour
  7. Check and record the OD for every hour until the OD starts to double, then check ever 30 minutes
  8. Record all data

Static Biofilm Assay

  1. Grow the E.coli to stationary phase
  2. Dilute bacteria to 1:100 with SOB media
  3. Place 200uL of the culture samples in each well making sure to do triplicates of each dilution and a control well
  4. Set up duplicats of the plates for each time interval needed
  5. Set up trays:
    • 1st tray - No water, used to collect waste
    • 2nd tray - Fill 1 to 2 inches of tap water, used to wash out bacteria
    • 3rd and 4th tray - Also filled with 1 to 2 inches of water, used to wash off the trays when the wells have been stained
  6. After growing for the given time intervals, remove platonic cells by shaking the plate over the waste tray and submerging it and shaking it over the 2nd tray.
  7. Add125uL of 0.1% crystal violet solution to each well and allow to sit for 10 minutes
  8. Wash out the stain with trays 3 and 4
  9. Add 200uL of 80% ethanol/20% acetone to each well and let sit at room temperature for 10-15 minutes
  10. Mix the wells by pipetting
  11. Transfer 125 uL to a container that can be used to measure OD
  12. Measure the OD and record results

M9 Minimal Media Recipe

Make M9 salts:
  • Aliquet 200 mL H2 and add:
    • 6 g Na2HPO4 * 7H20
    • 3 g KH2PO4
    • 0.5 g NaCl
    • 1.0 g NH4Cl
  • Stir until dissolved
  • Adjust to 1000 mL with distilled H20
  • Autoclave
Media:
  • Measure approximately 700 mL of sterile H20
  • Add 200 mL of M9 salts
  • Add 2 mL of 1 M MgSO4 (sterile) (.24 g)
  • Add 20 mL of 20% glucose
  • Add 100 microliters of 1 M CaCl (sterile)
  • Adjust to 1000 mL with sterile H20

Retrieved from "http://2012.igem.org/Team:Purdue/Protocol"