Talk:Knight:Beta-galactosidase assay/96 well format: Difference between revisions
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==β-galactosidase activity versus A<sub>600</sub> of culture== | ==β-galactosidase activity versus A<sub>600</sub> of culture== | ||
#Grow an overnight culture of MG1655 | #Grow an overnight culture of several constructs | ||
#In the morning, dilute back | #*A = MG1655 | ||
# | #*B = MG1655+IPTG | ||
#Prepare | #*C = P20060+IPTG+AHL | ||
# | #*D = P20060.E0433+IPTG | ||
#At each hour point, take | #*E = P20060.E0433+IPTG+AHL | ||
# | #*F = R2000.E0433+IPTG+AHL | ||
#*G = | |||
#*H = Media+IPTG+AHL | |||
#In the morning, dilute back samples into EZ Rich Media to an A<sub>600</sub> of 0.001 (via a Nanodrop reading) in a 96 well plate. (Each well in a row should be identical with 175 μL of culture according to the list above.) | |||
#Let grow 1 hour. | |||
#Add IPTG and/or AHL to rows as appropriate. | |||
#Prepare the permeabilization buffer and aliquot 80 &muL into each well of a 96 well plate. | |||
#*Using a larger volume for permeabilization step because the samples are sitting for a while. | |||
#Measure the A<sub>600</sub> of the plate every 30-60 minutes or grow the plate in the plate reader and pause it every 30-60 mins. | |||
#At each hour point, take 20 μL of the next column of culture and add it to the corresponding columns of the permeabilization plate. | |||
#Once each time point has been taken, move 25 μL of each well from the permeabilized culture to a new plate. | |||
#Add 150 μL of substrate solution to each well. | |||
#Place plate in the plate reader to measure change in A<sub>420</sub> as a function of time. | |||
#Plot the β-galactosidase activity in Miller Units as a function of the A<sub>600</sub> of the culture. | #Plot the β-galactosidase activity in Miller Units as a function of the A<sub>600</sub> of the culture. | ||
==A<sub>420</sub> versus [[ONP|o-nitrophenol]] concentration== | ==A<sub>420</sub> versus [[ONP|o-nitrophenol]] concentration== |
Revision as of 19:49, 24 October 2007
This is an outline of various control experiments that I need to do. It is a work in progress and has not been done.
A600 versus cell density
- Grow an overnight culture to saturation in EZ Rich Media
- Pellet the cells
- Resuspend in 1/4 of the original volume with EZ Rich Media
- Add 350 μL of cell suspension to the first well
- Add 175 μL of previous well to next well.
- Add 175 μL of EZ Rich Media to that well.
- Repeat dilution series until the well's solution looks totally clear.
- Add an addditional well of 175 μL EZ Rich Media.
- Measure A600 of each well in the plate reader.
- Plot A420 versus dilution factor. This relationship should be linear.
β-galactosidase activity versus A600 of culture
- Grow an overnight culture of several constructs
- A = MG1655
- B = MG1655+IPTG
- C = P20060+IPTG+AHL
- D = P20060.E0433+IPTG
- E = P20060.E0433+IPTG+AHL
- F = R2000.E0433+IPTG+AHL
- G =
- H = Media+IPTG+AHL
- In the morning, dilute back samples into EZ Rich Media to an A600 of 0.001 (via a Nanodrop reading) in a 96 well plate. (Each well in a row should be identical with 175 μL of culture according to the list above.)
- Let grow 1 hour.
- Add IPTG and/or AHL to rows as appropriate.
- Prepare the permeabilization buffer and aliquot 80 &muL into each well of a 96 well plate.
- Using a larger volume for permeabilization step because the samples are sitting for a while.
- Measure the A600 of the plate every 30-60 minutes or grow the plate in the plate reader and pause it every 30-60 mins.
- At each hour point, take 20 μL of the next column of culture and add it to the corresponding columns of the permeabilization plate.
- Once each time point has been taken, move 25 μL of each well from the permeabilized culture to a new plate.
- Add 150 μL of substrate solution to each well.
- Place plate in the plate reader to measure change in A420 as a function of time.
- Plot the β-galactosidase activity in Miller Units as a function of the A600 of the culture.
A420 versus o-nitrophenol concentration
- Make up a solution of 7 mL to control for background absorbance in β-galactosidase assays
- 800 μL permeabilization solution
- 6 mL substrate solution without ONPG
- 200 μL EZ rich media supplemented with kanamycin and AHL
- Make up 1mL of 4 mg/mL ONP.
- Add 350 μL of 4mg/mL solution to the first well.
- Move 175 μL of previous well to next well.
- Add 175 μL of background solution to that well.
- Repeat dilution series until the well's solution looks totally clear.
- Add an addditional well of 175 μL background solution.
- Measure A420 and A550 of each well in the plate reader.
- Plot A420 versus ONP concentration. This relationship should be linear.
Concentration series:
4mg/mL -> 2mg/mL -> 1mg/mL -> 0.5 mg/mL -> 0.25 mg/mL -> 0.125 mg/mL -> 62.5 μg/mL -> 31.25 μg/mL -> 15.625 μg/mL
-> 7.8125 μg/mL -> 3.90625 μg/mL -> 1.953125 μg/mL -> 0.9765625 μg/mL