Arizona_State
Notebook:Amber Mani
Friday 6/23/17 - Running colony PCR on the AUBr and the BTA3
From earlier this week the AUBr results showed that number 9 may be a match for the vector we needed but the sequencing was returned and it was an error. Redoing the AUBr today and running the PCR for the BTA3 to try for a result on at least one per receiver.
Since it is the weekend, instead of placing the new agar plate with the 24 samples of plated AUBr and BTA3 into the 37c incubator, leaving the sample out in room temperature as to not accelerate the growth too much over the weekend. See picture below:
- Defrost template, 2x Master Mix and primers
- Determine desired total working volume (~20uL per tube of 24 total/ each AUBr and BTA3 have 24 samples=520ul. The additional 40ul over the 480ul is to give 40ul (2 additional samples) over as precautionary buffer)
- Label reaction tubes
- Create below reaction mix
- Place mixture in thermal cycler at settings shown below
* Used 24 PCR tubes and labeled 1-24 for each receiver
* Thawed two AMP plate and labeled 24 spots on tray / AUB/AMBER/6/23/17 and BTA3/BRIANNA/6/23/2017
* Used 260 μl of Go Taq Green - added to each 2 DNA tubes
* Added 249.6 μl of H20, to each of the 2 DNA tubes
* Added FP and RP 5.2 ul of each to DNA tubes,(1 μ molar as final concentration)
* Pipetted 20 μl of newly mixed green solution into each PCR tube
Colony Prep: See images at the beginning of todays entry for the new plated 24 samples of AUBr and BTA3
* Next scraped one colony at a time (up to the 24 used) from the existing grown AUB plate and gently placed the colonly onto the new AUB plate with the labeled 24 spots. Disposed of each tip used into the cooresponding PCR tube labeled to match the placement number on the new AUB plate. Same protocol for the BTA3.
* Used empty pipette to attach to each tip in the PCR tubes and pump up and down to mix and remove as much of the leftover bacteria from the tip as possible so it mixed into the PCR tube. Then disposed of the tips in dry waste.
* Took 2 full sets of 24 PCR tubes to the thermocycler and had Stephan help with the settings since each setting is different for each type of bacteria or sample being run for PCR.
* PCR set to take 2.5 hours/ in process now.
PCR finished up and running gels for both the AUBr and BTA3.
Running a gel to test the DNA vector concentration that we are looking for - AUBr has 24 samples with 20 μl in each PCR tube and BTA3 has 24 samples of 20 μl each PCR tube. Will run 2 gels, one for AUB and one for BTA3, each with with 5 μl of each sample in the gel. To fit everything we ran with 2 rows of the 14 wells.
* The first gel to run is the AUBr: The first well is the KB+ ladder, the 2nd well is blank. Across the top row, in numberical order, starting in the 3rd well, are samples number 1-12. In the second row the first well is the KB+ ladder, the second well is blank and starting in the 3rd well are numbers 13-24. Ran the gel at 110V for 45 minutes.
Image of the AUBr gel setup:
* The second gel to run is the BTA3: The first well is the KB+ ladder with the second well blank. Across the top row, in numerical order, starting in the 3rd well, are 5μl samples number 1-12. In the second row the first well is the KB+ ladder, the second well is blank and starting in the 3rd well are 5μl samples number 13-24. Ran the gel at 110V for 45 minutes.
Image of the BTA3 gel setup:
In the gel results for the AUBr there were ZERO/ 0 samples that were successful:
The gel results for the BTA3 below showed that there was ZERO / 0 successful BTA3 samples.
After closer examination there were some good samples but the placement of the DNA in the loading wells was mixed up. Sequencing confirmed the fragments were what we were looking for and the error was corrected resulting in a successful experiment.
Notebook: Brianna Lopez
Transformation of Negative Sender and LuxR
- These colonies will be used for overnight liquid culture growth, which will be used in 96-well plating for overnight growth curves.
- Transformation of a negative sender, and 2620 vector.
- Concentration of 2620 & Neg Sender:
-2620 = 135 ng/uL
-Neg Sender = 461 ng/uL (will have to do 1:10 dilution)
- Calculation Calculation to get concentration of 60 ng/uL each:
- Negative Sender:
- 461 ng/ul (1uL into 9uL H20) = 46.1 ng/uL
- 46.1 ng/uL * x uL = 60 ng
- x = 1.3 uL
- 135 ng/uL * x uL = 60 ng
- x = .44 uL
Protocol:
Materials:
- Ice bucket
- 2620
- Negative Sender
- DI H20
Dilution Procedure:
- One 1.5mL tube was used to perform a dilution, and labeled dilution tube.
- 9uL of DI H20 was pipetted into the dilution tube.
- 1uL of negative sender was taken out of stock and pipetted into the dilution tube.
- The volume was then pipetted up and down to mix and dilute the solution.
Transformation Procedure:
- One tube was labeled 2620, the other negative sender
- 1.3uL of negative sender was pipetted from the dilution tube into the negative sender tube
- 0.44uL of 2620 was pipetted from 2620 stock tube into the 2620 tube.
- Tubes were then placed on ice for 2-5 minutes
- The tubes were then placed on the hot plate of 42C for exactly 45 seconds then immediately placed on ice for 5 minutes.
- 300uL of SOC was added to each tube
- It was then placed in the 37C shaking incubator for 20-30 minutes
- The tubes were then spun down at 3000 rpm for 1 minute
- The liquid in the tubes were gently tapped out into liquid waste
- 100uL of SOC was added to the tubes and gently pipetted up and down to resuspend the cells
- 100uL of each tube were then plated onto LB/AMP plates
- Then placed in 37̊C still incubator over night
Serial Dilutions
- This is where the set range of dilution concentrations comes in handy.
- The dilutions for these sets of ranges is a 1:10 dilution. So, a 1-part AHL and 9-part ethyl acetate solution.
- No matter how large the volume of your dilutions, it will always be 1:10.
- For this project, it is a 100uL volume, therefore 10uL will be AHL solution and 90uL ethyl acetate.
- In some cases, the dilution mixture will be a 50uL volume with 5uL being AHL solution and 45uL will ethyl acetate. This is to conserve the longevity of the AHL when doing a single receiver at a time and plating with 2 AHLs.
- For this particular example, however, a 100uL volume and its corresponding 1:10 dilution will be performed.
- 100uL of the 1*10^(-2)M stock solution is pipetted into a tube (for easy access and to prevent contamination of the stock solution)
- 10uL of the stock solution is pipetted into 90uL of Ethyl Acetate to bring the concentration down to 1*10^(-3)M
- Mixing Each Tube:
-
- Pipette up/down
- Vortex
- Spin down (using tabletop centrifuge)
- Continue onto the next dilution
- Steps 2- 3d will be repeated until the final lowest concentration is reached.
- The dilutions will be set up as follows:
- For half dilutions, i.e. 5*10^(-2), 5*10^(-3) it is the same concept except they are 1:1 dilutions instead of 1:10.
- Two ways of doing this includes doing one 1:1 dilution with the stock solution, then doing a 1:10 dilution using the result from the 1:1 dilution. Or it can be done doing a 1:1 dilution for each individual concentration, i.e. 1*10^(-2), 1*10^(-3)
Note: When these solutions are plated, the concentration will be further diluted by 10^-2. For example, 1*10^-2M will be pipetted to its corresponding well on the well-plate, and the AHL final concentration on the well will be 1*10^-4M. This is where the 1*10^-4M to 1*10^-14M concentration range of AHL comes into effect.
Dissolving AHL in Ethyl Acetate
- The first thing that must be done is to determine the molecular weight of the AHL, in this case the Lux AHL.
- Usually the synthetic AHLs are purchased from Sigma-Aldrich and depending on the volume of what is bought from the company, the milligrams it comes in is important when calculating how much must be dissolved.
- In the case of this project, the final stock concentration that was desired was 1*10^(-2)M. In this project, the highest AHL concentration desired was 1*10^(-4)M, but when plated the concentration is diluted down by 10^(-2). Therefore a starting concentrating of 1*10^(-2)M is beneficial.
- Then Stoichiometry must be performed to determine the volume in which the AHL in milligrams will be dissolved in, then how much ethyl acetate must be added to get to the desired final stock concentration.
- First is to determine the molecular weight and container size the AHL comes in.
- 213.2 g/mol
- 10 milligrams of AHL in the container
- Then is to determine the desired stock concentration.
- This depends upon your range of concentrations, and how high the range is.
- Range is: 1*10^(-4)M- 1*10^(-14)M
- Therefore stock solution concentration: 1*10^(-2)M
- Then determine how large of a stock solution is needed
- Since it is difficult to measure out exact milligrams of the AHL and back into a container without losing any grams, a large enough stock solution would be the most beneficial and use the entire AHL in the container.
- Desired Volume of Stock Solution: 500uL
- Determine Concentration of AHL contained in the stock volume
- Here is where stoichiometry comes into play. The milligrams per stock volume must be converted into standard SI molarity.
- 10mg/500μL * 1g/1*103mg * 1*106L/1μL * 1mol/213.2g = 0.094M
- The concentration found is the stock solution concentration needed for dilutions.
- Once done with the dilution to 1*10^-2 M, immediately put inside a -80C freezer for long term storage.
- With the concentration found above, it will be used in the C1V1=C2V2 equation.
- C1 will be the concentration found above.
- V1 is the amount of AHL from stock solution into ethyl acetate solution
- C2 is the concentration of the stock solution
- V2 is the volume of the solution that is going to be further diluted and used in plating
- (0.094M)(V1)=(50uL)(1e-2M)
- V1=5.32uL AHL
- Subtract AHL volume from total volume
- This volume of AHL will be used to find the volume of ethyl acetate to dilute the AHL into a 1*10^-2M solution.
- So, 500 – 5.32uL = 44.68uL of ethyl acetate
- Add these two amounts together in a 1.5mL centrifuge tube
- Mixing the Tube:
- Pipette up/down
- Vortex
- Spin down (using tabletop centrifuge)
- Immediately place dilution in the -20C freezer for immediate use of plating or for further dilutions.
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