Team:CU-Boulder/Notebook/Protocols

From 2014.igem.org

(Difference between revisions)
(Bacterial Infection)
Line 6: Line 6:
'''Need'''
'''Need'''
-
*Plate of infectable cells that contain F’ episome
+
:*Plate of infectable cells that contain F’ episome
-
*2.5M NaCl/20% PEG-8000
+
:*2.5M NaCl/20% PEG-8000
-
*1x TBS
+
:*1x TBS
'''Day 1'''
'''Day 1'''
-
*1.Add a fresh colony of infectable cells to 50mL LB in 125mL flask.  
+
:1.Add a fresh colony of infectable cells to 50mL LB in 125mL flask.  
-
**a. Include phagemid antibiotic only.  
+
::a. Include phagemid antibiotic only.  
-
**b. Grow at 37°C, 250rpm until OD is between 0.03 and 0.05
+
::b. Grow at 37°C, 250rpm until OD is between 0.03 and 0.05
-
*2.Add the helper phage to a final concentration of 1 x10^8 phage/mL
+
:2.Add the helper phage to a final concentration of 1 x10^8 phage/mL
-
*3.Incubate for 60-90 minutes, shaking
+
:3.Incubate for 60-90 minutes, shaking
-
*4.Add Helper Phagemid antibiotic to a high concentration
+
:4.Add Helper Phagemid antibiotic to a high concentration
-
*5.Grow for 14-18 hours at 37°C, shaking
+
:5.Grow for 14-18 hours at 37°C, shaking
'''Day 2'''
'''Day 2'''
Line 36: Line 36:
#Spin briefly. Remove supernatant with pipet
#Spin briefly. Remove supernatant with pipet
#Resuspend pellet in 200ul 1x TBS.  
#Resuspend pellet in 200ul 1x TBS.  
-
**a. If desired, combine contents of both tubes into one
+
::a. If desired, combine contents of both tubes into one
'''2.5M NaCl/20% PEG-8000 (5x)'''
'''2.5M NaCl/20% PEG-8000 (5x)'''
-
*100 g PEG-8000
+
:100 g PEG-8000
-
*75 g NaCl
+
:75 g NaCl
-
*400 mL H<sub>2</sub>O
+
:400 mL H<sub>2</sub>O
-
*Bring final volume to 500 mL
+
:Bring final volume to 500 mL
'''TBS (1x)'''
'''TBS (1x)'''
-
*6.05 g Tris
+
:6.05 g Tris
-
*8.76 g NaCl
+
:8.76 g NaCl
-
*800 mL H<sub>2</sub>O
+
:800 mL H<sub>2</sub>O
-
*Adjust pH to 7.6 with 1M HCL
+
:Adjust pH to 7.6 with 1M HCL
-
*Adjust volume to 1 L
+
:Adjust volume to 1 L
<br>
<br>
<br>
<br>
Line 61: Line 61:
'''Transformation'''
'''Transformation'''
-
*1.Thaw chemically competent cells on ice for 10-15 minutes
+
:1.Thaw chemically competent cells on ice for 10-15 minutes
-
*2.Add 40ul cells to fresh 1.7mL tube
+
:2.Add 40ul cells to fresh 1.7mL tube
-
*3.Add DNA
+
:3.Add DNA
-
**a. If using a ligation product add up to 10ul of sample
+
::a. If using a ligation product add up to 10ul of sample
-
**b. If using supercoiled plasmid add 100ng
+
::b. If using supercoiled plasmid add 100ng
-
*4.Incubate on ice for 30 minutes
+
:4.Incubate on ice for 30 minutes
-
*5.Heat shock cells on hot plate (or water bath) for 30-45s* @ 42°C
+
:5.Heat shock cells on hot plate (or water bath) for 30-45s* @ 42°C
-
*6.Incubate on ice for 2-5 minutes
+
:6.Incubate on ice for 2-5 minutes
-
*7.Add 200 μL SOC and shake gently for 1-2 hours @ 37° C
+
:7.Add 200 μL SOC and shake gently for 1-2 hours @ 37° C
-
**a.('''Note''': Can also recover in 960ul. After recovery, gently spin cells and remove supernatant. Resuspend in 200ul LB)
+
::a.('''Note''': Can also recover in 960ul. After recovery, gently spin cells and remove supernatant. Resuspend in 200ul LB)
-
*8.Plate 100-200ul cells onto selection plates
+
:8.Plate 100-200ul cells onto selection plates
-
**a. If high efficiency is expected, we suggest also plating a 1:10 dilution
+
::a. If high efficiency is expected, we suggest also plating a 1:10 dilution
-
*9.Once dry, turn upside down (agar on top) and incubate overnight @ 37° C
+
:9.Once dry, turn upside down (agar on top) and incubate overnight @ 37° C
-
** *Optimal timing depends on cells
+
::*Optimal timing depends on cells
'''SOC (1L)'''
'''SOC (1L)'''
-
*20 g Tryptone
+
:20 g Tryptone
-
*5 g YeastExtract
+
:5 g YeastExtract
-
*4.8 g MgSO4
+
:4.8 g MgSO4
-
*3.6 g Dextrose
+
:3.6 g Dextrose
-
*0.5 g NaCl
+
:0.5 g NaCl
-
*0.186 g KCL
+
:0.186 g KCL
<br>
<br>
<br>
<br>
Line 101: Line 101:
'''Day 2'''
'''Day 2'''
-
*1.Mix 500ul of each overnight sample in a new tube. Mix by pipetting or flicking
+
:1.Mix 500ul of each overnight sample in a new tube. Mix by pipetting or flicking
-
*2.Incubate for 30 minutes at 37°C, shaking
+
:2.Incubate for 30 minutes at 37°C, shaking
-
*3.Plate 100ul onto double selection plate
+
:3.Plate 100ul onto double selection plate
-
**a.We advise also plating a 1:10 dilution
+
::a.We advise also plating a 1:10 dilution
-
*4.Incubate at 37°C
+
:4.Incubate at 37°C
-
http://inst.bact.wisc.edu/inst/index.php?module=Book&func=displayarticle&art_id=128
 
<br>
<br>
<br>
<br>
Line 125: Line 124:
'''Day 2'''
'''Day 2'''
-
*1.Add 0.5mL of the overnight culture to 50mL LB
+
:1.Add 0.5mL of the overnight culture to 50mL LB
-
*2.Grow until OD is between 0.2 and 0.4
+
:2.Grow until OD is between 0.2 and 0.4
-
*3.Incubate on ice for 30 minutes
+
:3.Incubate on ice for 30 minutes
-
*4.Centrifuge for 10 minutes at 2700 x g and 4°C
+
:4.Centrifuge for 10 minutes at 2700 x g and 4°C
-
*5.Decant. Dry upside down on a paper towel for 1 minute
+
:5.Decant. Dry upside down on a paper towel for 1 minute
-
*6.Completely resuspend in 30mL 0.8M MgCl2, 0.2M CaCl2
+
:6.Completely resuspend in 30mL 0.8M MgCl2, 0.2M CaCl2
-
**a. Gently vortex
+
::a. Gently vortex
-
*7.Centrifuge for 10 minutes at 2700 x g and 4°C
+
:7.Centrifuge for 10 minutes at 2700 x g and 4°C
-
*8.Decant. Dry upside down on a paper towel for 1 minute
+
:8.Decant. Dry upside down on a paper towel for 1 minute
-
*9.Fully resuspend in 2mL of 0.1M CaCl2
+
:9.Fully resuspend in 2mL of 0.1M CaCl2
-
*10.Chill sample on ice. Add 70ul DMSO, keeping the sample tube on ice
+
:10.Chill sample on ice. Add 70ul DMSO, keeping the sample tube on ice
-
*11.Swirl to mix
+
:11.Swirl to mix
-
*12.Incubate on ice for 15 minutes
+
:12.Incubate on ice for 15 minutes
-
*13.Add 70ul DMSO, swirl to mix, keeping the sample tube on ice
+
:13.Add 70ul DMSO, swirl to mix, keeping the sample tube on ice
-
*14.Dispense 200ul into pre-chilled 1.7mL tubes
+
:14.Dispense 200ul into pre-chilled 1.7mL tubes
-
*15.Snap freeze with liquid nitrogen or dry ice
+
:15.Snap freeze with liquid nitrogen or dry ice
-
*16.Store at -80°C until ready to use
+
:16.Store at -80°C until ready to use
<br>
<br>
<br>
<br>
Line 149: Line 148:
   
   
-
 
'''Need'''
'''Need'''
Line 158: Line 156:
'''Day 1'''
'''Day 1'''
-
*1.Add a fresh colony to 50mL LB in 125mL flask. Grow at 37°C, 250rpm until OD is between 0.03 and 0.05
+
:1.Add a fresh colony to 50mL LB in 125mL flask. Grow at 37°C, 250rpm until OD is between 0.03 and 0.05
-
*2.Add M13KO7 helper phage to a final concentration of 1 x10^8 phage/mL*
+
:2.Add M13KO7 helper phage to a final concentration of 1 x10^8 phage/mL*
-
*3.Continue shaking for 60-90 minutes
+
:3.Continue shaking for 60-90 minutes
-
*4.Add Kanamycin to final concentration of 70ug/mL
+
:4.Add Kanamycin to final concentration of 70ug/mL
-
*5.Grow for 14-18 hours at 37°C, 250rpm
+
:5.Grow for 14-18 hours at 37°C, 250rpm
-
* *Can use a different helper phage if needed. In step 4, add the antibiotic specific to the Helper Phagemid
+
:*Can use a different helper phage if needed. In step 4, add the antibiotic specific to the Helper Phagemid
'''Day 2'''
'''Day 2'''
-
*1.Spin culture at 4,000 x g for 10 minutes
+
:1.Spin culture at 4,000 x g for 10 minutes
-
*2.Transfer supernatant to a fresh conical. Repeat spin on supernatant
+
:2.Transfer supernatant to a fresh conical. Repeat spin on supernatant
-
*3.Transfer the upper 90% of supernatant to a new conical
+
:3.Transfer the upper 90% of supernatant to a new conical
-
*4.Add 0.2 volume of 2.5M NaCl/20% PEG-8000 to the new conical. Gently mix
+
:4.Add 0.2 volume of 2.5M NaCl/20% PEG-8000 to the new conical. Gently mix
-
*5.Incubate at 4°C for at least 60 minutes
+
:5.Incubate at 4°C for at least 60 minutes
-
*6.Centrifuge at 12,000 x g for 10 minutes. Carefully decant
+
:6.Centrifuge at 12,000 x g for 10 minutes. Carefully decant
-
*7.Spin again briefly
+
:7.Spin again briefly
-
*8.Gently resuspend pellet in 1.6mL 1x TBS
+
:8.Gently resuspend pellet in 1.6mL 1x TBS
-
*9.Aliquot 800ul into 2 microfuge tubes. Proceed with both tubes
+
:9.Aliquot 800ul into 2 microfuge tubes. Proceed with both tubes
-
*10.Spin sample for 1 minute to pellet remaining cells. Transfer supernatant to fresh tubes
+
:10.Spin sample for 1 minute to pellet remaining cells. Transfer supernatant to fresh tubes
-
*11.Add 160ul of 2.5M NaCl/20% PEG-8000 solution to each
+
:11.Add 160ul of 2.5M NaCl/20% PEG-8000 solution to each
-
*12.Let sit at room temperature for 5 minutes
+
:12.Let sit at room temperature for 5 minutes
-
*13.Spin at 1300 x g for 10 minutes
+
:13.Spin at 1300 x g for 10 minutes
-
*14.Decant the supernatant
+
:14.Decant the supernatant
-
*15.Spin briefly. Remove supernatant with pipet
+
:15.Spin briefly. Remove supernatant with pipet
-
*16.Resuspend pellets in 300ul TE
+
:16.Resuspend pellets in 300ul TE
-
*17.Phenol extraction: add 300ul phenol. Vortex for 15 seconds
+
:17.Phenol extraction: add 300ul phenol. Vortex for 15 seconds
-
**a.Let sit for 15 minutes. Spin for 10 minutes
+
::a.Let sit for 15 minutes. Spin for 10 minutes
-
*18.Add H2O so volume samples is about 300ul
+
:18.Add H2O so volume samples is about 300ul
-
*19.Phenol/chloroform extraction*: add 300ul PCIA
+
:19.Phenol/chloroform extraction*: add 300ul PCIA
-
**a.Vortex for 15 seconds. Spin for 10 minutes
+
::a.Vortex for 15 seconds. Spin for 10 minutes
-
*20.Repeat Phenol/Chloroform extraction
+
:20.Repeat Phenol/Chloroform extraction
-
*21.Chloroform extraction*: add 300ul chloroform
+
:21.Chloroform extraction*: add 300ul chloroform
-
**a.Vortex 15 seconds. Spin for 10 minutes
+
::a.Vortex 15 seconds. Spin for 10 minutes
-
*22.Add 30ul 2.5M NaAc (pH 4.8)
+
:22.Add 30ul 2.5M NaAc (pH 4.8)
-
*23.Add 2-2.5 volumes ethanol
+
:23.Add 2-2.5 volumes ethanol
-
*24.Let precipitate for ~2 hours at -20°C
+
:24.Let precipitate for ~2 hours at -20°C
-
*25.Spin for 1 minute
+
:25.Spin for 1 minute
-
*26.Decant supernatant
+
:26.Decant supernatant
-
*27.Resuspend in 25-50ul TE
+
:27.Resuspend in 25-50ul TE
-
* *Performing steps at 4°C helps with separation
+
:*Performing steps at 4°C helps with separation
'''2.5M NaCl/20% PEG-8000 (5x)'''
'''2.5M NaCl/20% PEG-8000 (5x)'''
-
*100 g PEG-800
+
:100 g PEG-800
-
*75 g NaCl
+
:75 g NaCl
-
*400 mL H<sub>2</sub>O
+
:400 mL H<sub>2</sub>O
 +
:: *Bring final volume to 500 mL
-
** *Bring final volume to 500 mL
 
'''TBS (1x)'''
'''TBS (1x)'''
 +
:6.05 g Tris
 +
:8.76 g NaCl
 +
:800 mL H<sub>2</sub>O
-
*6.05 g Tris
+
:: *Adjust pH to 7.6 with 1M HCL
-
*8.76 g NaCl
+
:: *Adjust volume to 1L
-
 
+
-
*800 mL H<sub>2</sub>O
+
-
 
+
-
** *Adjust pH to 7.6 with 1M HCL
+
-
 
+
-
** *Adjust volume to 1L
+
<br>
<br>
<br>
<br>
Line 233: Line 228:
'''Day 1'''
'''Day 1'''
-
*1.Grow liquid overnight culture of infectable cells
+
:1.Grow liquid overnight culture of infectable cells
   
   
'''Day 2'''
'''Day 2'''
-
*1.Add 200ul overnight culture to 20mL LB in a 250mL flask
+
:1.Add 200ul overnight culture to 20mL LB in a 250mL flask
-
*2.Add 1ul phage suspension
+
:2.Add 1ul phage suspension
-
*3.Incubate for 4-5 hours at 37°C, 250rpm
+
:3.Incubate for 4-5 hours at 37°C, 250rpm
-
*4.Centrifuge for 10 minutes at 4500 x g
+
:4.Centrifuge for 10 minutes at 4500 x g
-
*5.Transfer supernatant to a new tube.
+
:5.Transfer supernatant to a new tube.
-
*6.Repeat centrifugation on supernatant
+
:6.Repeat centrifugation on supernatant
-
*7.Transfer top 16mL of supernatant to a new tube
+
:7.Transfer top 16mL of supernatant to a new tube
-
*8.Add 4mL of 2.5M NaCl/20% PEG-8000. Briefly mix
+
:8.Add 4mL of 2.5M NaCl/20% PEG-8000. Briefly mix
-
*9.Precipitate phage for 1 hour or overnight at 4°C
+
:9.Precipitate phage for 1 hour or overnight at 4°C
-
*10.Centrifuge for 15 minutes at 12000 x g. Decant supernatant
+
:10.Centrifuge for 15 minutes at 12000 x g. Decant supernatant
-
*a. Spin briefly. Remove residual supernatant with pipet
+
:a. Spin briefly. Remove residual supernatant with pipet
-
*11.Resuspend pellet in 1mL 1x TBS. Transfer to 1.7mL tube
+
:11.Resuspend pellet in 1mL 1x TBS. Transfer to 1.7mL tube
-
*12.Spin briefly to remove cell debris
+
:12.Spin briefly to remove cell debris
-
*13.Transfer supernatant to a new tube
+
:13.Transfer supernatant to a new tube
-
*14.Add 200ul of 2.5M NaCl/20% PEG-8000
+
:14.Add 200ul of 2.5M NaCl/20% PEG-8000
-
*15.Incubate on ice for 15-60 minutes
+
:15.Incubate on ice for 15-60 minutes
-
*16.Spin for 10 minutes at 12000-14000 rpm. Discard supernatant
+
:16.Spin for 10 minutes at 12000-14000 rpm. Discard supernatant
-
*17.Briefly spin. Remove supernatant with pipette
+
:17.Briefly spin. Remove supernatant with pipette
-
*18.Resuspend pellet in 200uL TBS
+
:18.Resuspend pellet in 200uL TBS
-
*19.For long term storage at -20C, add 200uL glycerol
+
:19.For long term storage at -20C, add 200uL glycerol
'''2.5M NaCl/20% PEG-8000 (5x)'''
'''2.5M NaCl/20% PEG-8000 (5x)'''
-
*100 g PEG-8000  
+
:100 g PEG-8000  
-
*75 g NaCl  
+
:75 g NaCl  
-
*400 mL H<sub>2</sub>O  
+
:400 mL H<sub>2</sub>O  
 +
::Bring final volume to 500 mL
-
**Bring final volume to 500 mL
 
-
 
-
 
'''TBS (1x)'''
'''TBS (1x)'''
-
 
+
:6.05 g Tris
-
*6.05 g Tris
+
:8.76 g NaCl         
-
 
+
:800 mL H<sub>2</sub>O  
-
*8.76 g NaCl         
+
-
 
+
-
*800 mL H<sub>2</sub>O  
+
::Adjust pH to 7.6 with 1M HCl
::Adjust pH to 7.6 with 1M HCl
Line 285: Line 275:
==QIAprep Spin Miniprep (Centrifuge method)==
==QIAprep Spin Miniprep (Centrifuge method)==
-
* This protocol is taken from the Qiagen Mini-prep Kit and is used to isolate plasmid DNA from a bacterial overnight.
+
: This protocol is taken from the Qiagen Mini-prep Kit and is used to isolate plasmid DNA from a bacterial overnight.
'''Notes before starting'''
'''Notes before starting'''
-
* '''Optional:''' Add LyseBlue reagent to Buffer P1 at a ratio of 1 to 1000
+
: '''Optional:''' Add LyseBlue reagent to Buffer P1 at a ratio of 1 to 1000
-
* Add the provided RNase A solution to Buffer P1, mix, '''store bottle at 2-8°C'''
+
*Add the provided RNase A solution to Buffer P1, mix, '''store bottle at 2-8°C'''
-
* Add ethanol (96-100%) to Buffer PE before use
+
*Add ethanol (96-100%) to Buffer PE before use
-
* All centrifugation steps are carried out at 13,000 rpm (~17,900xg) in a conventional table-top microcentrifuge
+
*All centrifugation steps are carried out at 13,000 rpm (~17,900xg) in a conventional table-top microcentrifuge
   
   
-
*1.Centrifuge 1-6mL bacterial overnight culture at >8000 rpm (6800xg) for 3 minutes at room temperature (15-25C)
+
:1.Centrifuge 1-6mL bacterial overnight culture at >8000 rpm (6800xg) for 3 minutes at room temperature (15-25C)
-
*2.Resuspend pellet in 250ul Buffer P1 and transfer to microcentrifuge tube
+
:2.Resuspend pellet in 250ul Buffer P1 and transfer to microcentrifuge tube
-
*3.Add 250ul Buffer P2 and mix thoroughly by inverting the tube 4-6 times until the solution becomes clear.
+
:3.Add 250ul Buffer P2 and mix thoroughly by inverting the tube 4-6 times until the solution becomes clear.
-
*a.DO NOT allow lysis reaction to proceed for more than 5 minutes
+
:a.DO NOT allow lysis reaction to proceed for more than 5 minutes
-
*b.If using LyseBlue reagent, the solution will turn blue
+
:b.If using LyseBlue reagent, the solution will turn blue
-
*4.Add 350ul Buffer N3 and mix immediately and thoroughly by inverting the tube 4-6 times.
+
:4.Add 350ul Buffer N3 and mix immediately and thoroughly by inverting the tube 4-6 times.
-
*a.If using LyseBlue reagent, the solution will turn colorless
+
:a.If using LyseBlue reagent, the solution will turn colorless
-
*5.Centrifuge for 10 minutes
+
:5.Centrifuge for 10 minutes
-
*6.Apply supernatant from step 5 to the QIAprep spin column by decanting or pipetting. Centrifuge for 30-60 s and discard the flow-through
+
:6.Apply supernatant from step 5 to the QIAprep spin column by decanting or pipetting. Centrifuge for 30-60 s and discard the flow-through
-
*7.Recommended: Wash the QIAprep spin column by adding 500 ul Buffer PB. Centrifuge for 30-60 s and discard the flow-through
+
:7.Recommended: Wash the QIAprep spin column by adding 500 ul Buffer PB. Centrifuge for 30-60 s and discard the flow-through
-
*a.Only required when using endA+ strains or other bacterial strains with high nuclease activity or carbohydrate content
+
:a.Only required when using endA+ strains or other bacterial strains with high nuclease activity or carbohydrate content
-
*8.Wash the QIAprep spin column by adding 750ul of Buffer PE. Centrifuge for 30-60 s and discard the flow-through
+
:8.Wash the QIAprep spin column by adding 750ul of Buffer PE. Centrifuge for 30-60 s and discard the flow-through
-
*9.Centrifuge for 1 minutes to remove residual wash buffer
+
:9.Centrifuge for 1 minutes to remove residual wash buffer
-
*10.Place the QIAprep column in a clean 1.5mL microcentrifuge tube. To elute DNA, add 30ul Buffer EB. Let stand for 1 min, and centrifuge for 1 minute
+
:10.Place the QIAprep column in a clean 1.5mL microcentrifuge tube. To elute DNA, add 30ul Buffer EB. Let stand for 1 min, and centrifuge for 1 minute
-
*a.Can elute DNA in 50ul but this will decrease DNA concentration
+
::a.Can elute DNA in 50ul but this will decrease DNA concentration
-
*b.To increase yield, let sit for up to 4 minutes
+
::b.To increase yield, let sit for up to 4 minutes
'''Buffer Recipes'''
'''Buffer Recipes'''
Line 326: Line 316:
'''P2 (Lysis buffer)'''
'''P2 (Lysis buffer)'''
-
*200 mM NaOH
+
:200 mM NaOH
-
*1% SDS (w/v)
+
:1% SDS (w/v)
'''N3*'''
'''N3*'''
-
*4.2 M Gu-HCl
+
:4.2 M Gu-HCl
-
*0.9 M KAc, pH 4.8
+
:0.9 M KAc, pH 4.8
'''PB*'''
'''PB*'''
-
*5 M Gu-HCl
+
:5 M Gu-HCl
-
*30% isopropanol
+
:30% isopropanol
'''PE*'''
'''PE*'''
-
*10 mM Tris-HCl pH 7.5
+
:10 mM Tris-HCl pH 7.5
-
*80% ethanol
+
:80% ethanol
'''Elution Buffer (EB)'''
'''Elution Buffer (EB)'''
-
*10 mM Tris-CL, pH 8.5
+
:10 mM Tris-CL, pH 8.5
-
 
+
-
*''Recipes from OpenWetWare''
+
 +
:''Recipes from OpenWetWare''
 +
<br>
 +
<br>
 +
<br>
==Bacterial Infection==
==Bacterial Infection==

Revision as of 22:45, 10 October 2014


Contents

Amplification of Phage using Helper Phage

Need

  • Plate of infectable cells that contain F’ episome
  • 2.5M NaCl/20% PEG-8000
  • 1x TBS

Day 1

1.Add a fresh colony of infectable cells to 50mL LB in 125mL flask.
a. Include phagemid antibiotic only.
b. Grow at 37°C, 250rpm until OD is between 0.03 and 0.05
2.Add the helper phage to a final concentration of 1 x10^8 phage/mL
3.Incubate for 60-90 minutes, shaking
4.Add Helper Phagemid antibiotic to a high concentration
5.Grow for 14-18 hours at 37°C, shaking

Day 2

  1. Spin culture at 4,000 x g for 10 minutes
  2. Transfer supernatant to a fresh conical. Repeat spin on supernatant
  3. Transfer the upper 90% of supernatant to a new conical
  4. Add 0.2 volume of 2.5M NaCl/20% PEG-8000 to the new conical. Gently mix
  5. Incubate at 4°C for at least 60 minutes
  6. Centrifuge at 12,000 x g for 10 minutes. Carefully decant
  7. Spin again briefly
  8. Gently resuspend pellet in 1.6mL 1x TBS
  9. Aliquot 800ul into 2 microfuge tubes. Proceed with both tubes
  10. Spin sample for 1 minute to pellet remaining cells. Transfer supernatant to fresh tubes
  11. Add 160ul of 2.5M NaCl/20% PEG-8000 solution to each
  12. Let sit at room temperature for 5 minutes
  13. Spin at 1300 x g for 10 minutes
  14. Decant the supernatant
  15. Spin briefly. Remove supernatant with pipet
  16. Resuspend pellet in 200ul 1x TBS.
a. If desired, combine contents of both tubes into one

2.5M NaCl/20% PEG-8000 (5x)

100 g PEG-8000
75 g NaCl
400 mL H2O
Bring final volume to 500 mL

TBS (1x)

6.05 g Tris
8.76 g NaCl
800 mL H2O
Adjust pH to 7.6 with 1M HCL
Adjust volume to 1 L




Bacterial Transformation Using Frozen Competent Cells

Before you start

  • Heat hot plate or water bath to 42°C
  • Warm selection plates to 37°C

Transformation

1.Thaw chemically competent cells on ice for 10-15 minutes
2.Add 40ul cells to fresh 1.7mL tube
3.Add DNA
a. If using a ligation product add up to 10ul of sample
b. If using supercoiled plasmid add 100ng
4.Incubate on ice for 30 minutes
5.Heat shock cells on hot plate (or water bath) for 30-45s* @ 42°C
6.Incubate on ice for 2-5 minutes
7.Add 200 μL SOC and shake gently for 1-2 hours @ 37° C
a.(Note: Can also recover in 960ul. After recovery, gently spin cells and remove supernatant. Resuspend in 200ul LB)
8.Plate 100-200ul cells onto selection plates
a. If high efficiency is expected, we suggest also plating a 1:10 dilution
9.Once dry, turn upside down (agar on top) and incubate overnight @ 37° C
  • Optimal timing depends on cells


SOC (1L)

20 g Tryptone
5 g YeastExtract
4.8 g MgSO4
3.6 g Dextrose
0.5 g NaCl
0.186 g KCL




Bacterial Conjugation

Need

  • Donor cells: Cells already containing F’ episome
  • Recipient cells: Cells with a resistance marker that is absent from donor cells
  • Double selection plate containing antibiotic to select for F’ episome and a second antibiotic to select for the recipient cells

Day 1

  1. Set up liquid overnight of donor cells. Include antibiotic
  2. Set up liquid overnight of recipient cells. Include antibiotic

Day 2

1.Mix 500ul of each overnight sample in a new tube. Mix by pipetting or flicking
2.Incubate for 30 minutes at 37°C, shaking
3.Plate 100ul onto double selection plate
a.We advise also plating a 1:10 dilution
4.Incubate at 37°C




Making Chemically Competent Bacteria

To prepare for Day 2

  • Set centrifuge to 4°C
  • MgCl2 and CaCl2 solutions
  • Thaw DMSO
  • Chill tubes
  • Acquire liquid nitrogen or dry ice

Day 1

  1. Grow cells O/N

Day 2

1.Add 0.5mL of the overnight culture to 50mL LB
2.Grow until OD is between 0.2 and 0.4
3.Incubate on ice for 30 minutes
4.Centrifuge for 10 minutes at 2700 x g and 4°C
5.Decant. Dry upside down on a paper towel for 1 minute
6.Completely resuspend in 30mL 0.8M MgCl2, 0.2M CaCl2
a. Gently vortex
7.Centrifuge for 10 minutes at 2700 x g and 4°C
8.Decant. Dry upside down on a paper towel for 1 minute
9.Fully resuspend in 2mL of 0.1M CaCl2
10.Chill sample on ice. Add 70ul DMSO, keeping the sample tube on ice
11.Swirl to mix
12.Incubate on ice for 15 minutes
13.Add 70ul DMSO, swirl to mix, keeping the sample tube on ice
14.Dispense 200ul into pre-chilled 1.7mL tubes
15.Snap freeze with liquid nitrogen or dry ice
16.Store at -80°C until ready to use




Isolation of single-stranded phagemid DNA using M13K07 Helper Phage

Need

  • Fresh plate of infectable cells (contain F’ episome)
  • 2.5M NaCl/20% PEG-8000
  • TBS, TE, phenol, phenol/chloroform, chloroform

Day 1

1.Add a fresh colony to 50mL LB in 125mL flask. Grow at 37°C, 250rpm until OD is between 0.03 and 0.05
2.Add M13KO7 helper phage to a final concentration of 1 x10^8 phage/mL*
3.Continue shaking for 60-90 minutes
4.Add Kanamycin to final concentration of 70ug/mL
5.Grow for 14-18 hours at 37°C, 250rpm
  • Can use a different helper phage if needed. In step 4, add the antibiotic specific to the Helper Phagemid

Day 2

1.Spin culture at 4,000 x g for 10 minutes
2.Transfer supernatant to a fresh conical. Repeat spin on supernatant
3.Transfer the upper 90% of supernatant to a new conical
4.Add 0.2 volume of 2.5M NaCl/20% PEG-8000 to the new conical. Gently mix
5.Incubate at 4°C for at least 60 minutes
6.Centrifuge at 12,000 x g for 10 minutes. Carefully decant
7.Spin again briefly
8.Gently resuspend pellet in 1.6mL 1x TBS
9.Aliquot 800ul into 2 microfuge tubes. Proceed with both tubes
10.Spin sample for 1 minute to pellet remaining cells. Transfer supernatant to fresh tubes
11.Add 160ul of 2.5M NaCl/20% PEG-8000 solution to each
12.Let sit at room temperature for 5 minutes
13.Spin at 1300 x g for 10 minutes
14.Decant the supernatant
15.Spin briefly. Remove supernatant with pipet
16.Resuspend pellets in 300ul TE
17.Phenol extraction: add 300ul phenol. Vortex for 15 seconds
a.Let sit for 15 minutes. Spin for 10 minutes
18.Add H2O so volume samples is about 300ul
19.Phenol/chloroform extraction*: add 300ul PCIA
a.Vortex for 15 seconds. Spin for 10 minutes
20.Repeat Phenol/Chloroform extraction
21.Chloroform extraction*: add 300ul chloroform
a.Vortex 15 seconds. Spin for 10 minutes
22.Add 30ul 2.5M NaAc (pH 4.8)
23.Add 2-2.5 volumes ethanol
24.Let precipitate for ~2 hours at -20°C
25.Spin for 1 minute
26.Decant supernatant
27.Resuspend in 25-50ul TE
  • Performing steps at 4°C helps with separation


2.5M NaCl/20% PEG-8000 (5x)

100 g PEG-800
75 g NaCl
400 mL H2O
*Bring final volume to 500 mL

TBS (1x)

6.05 g Tris
8.76 g NaCl
800 mL H2O
*Adjust pH to 7.6 with 1M HCL
*Adjust volume to 1L




M13 Amplification


This protocol is to make more M13 phages.

Need

  • Fresh plate of infectable cells (contain F’ episome)

Day 1

1.Grow liquid overnight culture of infectable cells

Day 2

1.Add 200ul overnight culture to 20mL LB in a 250mL flask
2.Add 1ul phage suspension
3.Incubate for 4-5 hours at 37°C, 250rpm
4.Centrifuge for 10 minutes at 4500 x g
5.Transfer supernatant to a new tube.
6.Repeat centrifugation on supernatant
7.Transfer top 16mL of supernatant to a new tube
8.Add 4mL of 2.5M NaCl/20% PEG-8000. Briefly mix
9.Precipitate phage for 1 hour or overnight at 4°C
10.Centrifuge for 15 minutes at 12000 x g. Decant supernatant
a. Spin briefly. Remove residual supernatant with pipet
11.Resuspend pellet in 1mL 1x TBS. Transfer to 1.7mL tube
12.Spin briefly to remove cell debris
13.Transfer supernatant to a new tube
14.Add 200ul of 2.5M NaCl/20% PEG-8000
15.Incubate on ice for 15-60 minutes
16.Spin for 10 minutes at 12000-14000 rpm. Discard supernatant
17.Briefly spin. Remove supernatant with pipette
18.Resuspend pellet in 200uL TBS
19.For long term storage at -20C, add 200uL glycerol


2.5M NaCl/20% PEG-8000 (5x)

100 g PEG-8000
75 g NaCl
400 mL H2O
Bring final volume to 500 mL

TBS (1x)

6.05 g Tris
8.76 g NaCl
800 mL H2O
Adjust pH to 7.6 with 1M HCl
Adjust volume to 1 L
Store at 3C for up to 3 months




QIAprep Spin Miniprep (Centrifuge method)

This protocol is taken from the Qiagen Mini-prep Kit and is used to isolate plasmid DNA from a bacterial overnight.

Notes before starting

Optional: Add LyseBlue reagent to Buffer P1 at a ratio of 1 to 1000
  • Add the provided RNase A solution to Buffer P1, mix, store bottle at 2-8°C
  • Add ethanol (96-100%) to Buffer PE before use
  • All centrifugation steps are carried out at 13,000 rpm (~17,900xg) in a conventional table-top microcentrifuge


1.Centrifuge 1-6mL bacterial overnight culture at >8000 rpm (6800xg) for 3 minutes at room temperature (15-25C)
2.Resuspend pellet in 250ul Buffer P1 and transfer to microcentrifuge tube
3.Add 250ul Buffer P2 and mix thoroughly by inverting the tube 4-6 times until the solution becomes clear.
a.DO NOT allow lysis reaction to proceed for more than 5 minutes
b.If using LyseBlue reagent, the solution will turn blue
4.Add 350ul Buffer N3 and mix immediately and thoroughly by inverting the tube 4-6 times.
a.If using LyseBlue reagent, the solution will turn colorless
5.Centrifuge for 10 minutes
6.Apply supernatant from step 5 to the QIAprep spin column by decanting or pipetting. Centrifuge for 30-60 s and discard the flow-through
7.Recommended: Wash the QIAprep spin column by adding 500 ul Buffer PB. Centrifuge for 30-60 s and discard the flow-through
a.Only required when using endA+ strains or other bacterial strains with high nuclease activity or carbohydrate content
8.Wash the QIAprep spin column by adding 750ul of Buffer PE. Centrifuge for 30-60 s and discard the flow-through
9.Centrifuge for 1 minutes to remove residual wash buffer
10.Place the QIAprep column in a clean 1.5mL microcentrifuge tube. To elute DNA, add 30ul Buffer EB. Let stand for 1 min, and centrifuge for 1 minute
a.Can elute DNA in 50ul but this will decrease DNA concentration
b.To increase yield, let sit for up to 4 minutes

Buffer Recipes

P1 50 mM Tris-Cl, pH 8.0 10 mM EDTA 100 ug/mL RNase A

*After RNase A addition, the buffer should be stored at 2-8C

P2 (Lysis buffer)

200 mM NaOH
1% SDS (w/v)

N3*

4.2 M Gu-HCl
0.9 M KAc, pH 4.8

PB*

5 M Gu-HCl
30% isopropanol

PE*

10 mM Tris-HCl pH 7.5
80% ethanol

Elution Buffer (EB)

10 mM Tris-CL, pH 8.5
Recipes from OpenWetWare




Bacterial Infection

Need

Fresh plate of cells that contain the F’ episome

Day 1

1.Pick colony from plate and grow overnight

Day 2

1.Dilute overnight to OD600 0.1
2.Incubate until OD600 ~ 0.5*
3.Add phage to a final concentration of 1 x108 phage/mL
4.Incubate for 30 minutes to infect
5.Plate samples under selection
a.We recommend trying a range of dilutions

Protocol from “Eliminating Helper phage from Phage Display

Note: All incubations are done at 37°C and shaking at 225rpm
Note: If multiple samples are to be done in parallel
  • If using the same cells, we suggest growing one large batch of cells. Once the OD has reached ~0.5, divide into 50mL samples then add phage.
  • If using different cells, grow each sample to ~0.5 then store on ice. Once all samples have reached ~0.5, incubate on ice for another 30 minutes. Warm for 20-30 minutes at 37C, 250 rpm. Measure OD again to check that samples are comparable (yes, they will have grown some). Add phage