Difference between revisions of "Team:Ionis Paris/Protocol 13"
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Measure bacterial culture OD <br/> | Measure bacterial culture OD <br/> | ||
<i>NB : Approximately 90% of GLuc is secreted out into the growth media after transfection and thus, the GLuc activity is typically assayed from the supernatant (i.e. growth media of GLuc-transfected cells). However, as long as the cells are alive, approximately 10% of GLuc is present inside the cells. Therefore, GLuc activity can also be assayed from the cell lysate. </i></p> | <i>NB : Approximately 90% of GLuc is secreted out into the growth media after transfection and thus, the GLuc activity is typically assayed from the supernatant (i.e. growth media of GLuc-transfected cells). However, as long as the cells are alive, approximately 10% of GLuc is present inside the cells. Therefore, GLuc activity can also be assayed from the cell lysate. </i></p> | ||
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| − | <p><li><a href="https://www.neb.com/protocols/1/01/01/protocol-i-luminometers-without-injectors-e3300">NEB Standard luminescence assay protocols</a></li></p> | + | <p><li><a href="https://www.neb.com/protocols/1/01/01/protocol-i-luminometers-without-injectors-e3300"><font color="DeepPink">NEB Standard luminescence assay protocols</font></a></li></p> |
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Latest revision as of 19:55, 19 October 2016
3 replicates for each toluene concentration were realized in order to improve the results statistics Every toluene manipulations were performed under a chemical hood and following the safety protocol available here . Bacterial culture containing toluene were only openned under the chemical hood. Spectrometer tank as well as 96 wells plate were covered with parafilm before proceeded to OD or luciferase activity measurement.
1g/L: Dilution of absolute liquid toluene to obtain a final toluene concentration at 1g/L: Add 11,53µL of toluene into 10mL water (calculations done from toluene's molecular weight) From 1 UFC: Incubate culture at 37°C and 250 rpm.
Protocol 13: Luciferase assay
Aim: Assess the luminescence of our biosensor when exposed to toluene
Toluene preparation: stock solutions
100mg/L: Dilute 1mL of the toluene stock solution at 1g/L into 9mL of water
100µg/L: Dilute 10µL of the toluene stock solution at 100mg/L into 10mL of water
Inoculation
Resuspend a colony in 20mL of LB medium containing chloramphenicol at 25µg/mL but free of toluene and grow over night.
When turbidity is high, inoculate the appropriate volume of bacteria culture to liquid LB medium containing chloramphenicol to reach 0,1 OD in the flask (100mL). Incubate culture at 37°C and 250 rpm .
When the OD reach 0.3, separate the initial bacterial culture into several falcon tubes (10mL in each tube) and add toluene to reach the desired toluene concentration.
C0 Control
C1
C2
Bacterial culture (mL)
10
10
10
Toluene from stock solution 100µg/L (µL)
0
1
10
Obtain concentration
0
10ng/L
100ng/L
C3
Bacterial culture (mL)
10
Toluene from stock solution 100mg/L (µL)
1
Obtain concentration
10µg/L
C4
Bacterial culture (mL)
10
Toluene from stock solution 1g/L (µL)
100
Obtain concentration
10mg/L
Prepare the GLuc assay solution (e.g. 100 samples) by adding 50µL of BioLux GLuc Substrate to 5mL of BioLux GLuc Assay Buffer immediately before performing the assay. Mix well by inverting the tube several times (Do not vortex). Set the camera.
At several time (t=1h, t=3h…,t=4h30, t=5h30), pipet samples (20µL per well) into a 96-well white (opaque) or black plate, or a luminometer tube.
Add 50µL of GLuc assay solution to a sample (i.e. Add the assay solution to only one sample at a time) and promptly measure the luminescence.
Measure bacterial culture OD
NB : Approximately 90% of GLuc is secreted out into the growth media after transfection and thus, the GLuc activity is typically assayed from the supernatant (i.e. growth media of GLuc-transfected cells). However, as long as the cells are alive, approximately 10% of GLuc is present inside the cells. Therefore, GLuc activity can also be assayed from the cell lysate.
