IGEM:Paris Bettencourt 2012/Notebooks/suicide group/day by day//2012/09/25: Difference between revisions
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== | ==pLac + Colicin E2 Immunity Characterization== | ||
We want to characterize the immunity by varying the concentration of IPTG and the ColicinE2 cells. | |||
===Protocol=== | |||
'''Preparation of the immunity cells''' | |||
#Grow overnight culture of pSG.008 (pLac-Immunity) and pSG.001 (pSB3C5) with antibiotic (Cm). | |||
#Centrifuge and resuspend in LB. | |||
#Prepare 5 tubes of 10ml LB and put 40uL of pSG.008 cells into 4 tubes and pSG.001 cells in 1 tube (negative control). | |||
#Incubate 37C for 30 minutes. | |||
#Put IPTG with different concentration in each tube (pSG.008: 100uL, 10uL, 1uL and 0/no IPTG). | |||
#Incubate again until the OD reaches 1.0. | |||
'''Preparation of the colicin supernatant''' | |||
#Grow overnight culture of Colicin E2 cells (pColE2-P9). | |||
#Put 40uL of the saturated cells into 10ml fresh LB. | |||
#Incubate 37C until the OD reaches 1.0. | |||
#Heat shock 42C for 30 seconds and incubate again for 1 hour. | |||
#Centrifuge the cells and collect the supernatant. | |||
#Dilute the tested cells 100x then in LB with antibiotic and corresponding concentration of IPTG. | |||
#Take each 0.5ml and mix with 0.5ml Colicin supernatant (undiluted, diluted 1000x, plain LB with corresponding amount of IPTG) in small 2ml eppendorf tubes. | |||
#Incubate for 30 minutes. | |||
#Dilute 100x in MgSO4 1e-2M | |||
#Plate 20uL in Cm. | |||
Note: 1ml of cells of OD 1.0 has 1e9 cells, so we expect if all cells survive we will get 1000 colonies at the end. | |||
===Results=== | ===Results=== | ||
Revision as of 03:07, 26 September 2012
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pLac + Colicin E2 Immunity CharacterizationWe want to characterize the immunity by varying the concentration of IPTG and the ColicinE2 cells. ProtocolPreparation of the immunity cells
Preparation of the colicin supernatant
Note: 1ml of cells of OD 1.0 has 1e9 cells, so we expect if all cells survive we will get 1000 colonies at the end. Results
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