Dandekar & Chandler:AHL Signal Measuring: Difference between revisions

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(New page: == AHL Signal measuring == In a large test tube containing the sample you wish to test: 1) Add 5mL of ethyl acetate and vortex on high for 30seconds 2) Let the sample sit for 10 minu...)
 
 
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== AHL Signal measuring  ==
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In a large test tube containing the sample you wish to test:
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1) Add 5mL of ethyl acetate and vortex on high for 30seconds
= AHL Signal measuring  =
2) Let the sample sit for 10 minutes to allow the two phases to separate out.
 
3) After the the 10 minute rest, pipette off the clear acetate layer only. Be careful to not draw up any of the bottom cell debris layer.  
Assay for acyl-HSL detection using E. coli reporters containing pQF50- (QS-controlled lacZ fusion, Ampicillin) and pJN105- (arabinose inducible R gene, gentamicin) derived plasmids.
4) Deposit the clear acetate layer in a 10mL glass tube with a sealable air tight cap.  
 
5) Repeat steps 1-4 and add acetate supernatant to tube from first cycle.  
===Principle===
6) Place acetate filled tubes into N2 evaporator on medium until all acetate has evaporated off.
 
7) Suspend dried signal in 100uL of ethyl acetate, screw sealable cap on tightly, wrap in parafilm and place in -20 freezer.
(add something here)
 
===Materials Needed===
 
* Spectrophotometer capable of reading 600 nm
* Plate reader
* Vortex
* 10mL test tube(s)
* eppendorf tubes (or chloroform resistant 96well plate)
* Sterile Cuvets
* Glass vial
* Nanopure H20
* Chloroform
* β-gal assay reagents
 
===Protocol===
* Inoculate overnight culture of reporter in LB plus respective antibiotics (10 μL Amp, 10μL 100 Gen 20 for pSC11 pJ105L / 10μL Amp 100 for pECP61.5) at 37C.
 
====3OC12·HSL via  pSC11 pJ105L====
 
# Calculate OD<sub>600</sub> of overnight reporter strain + antibiotics
# Subculture to desired volume at low density (~0.025) into 10mL LB + 10 μL Amp100, 10μL Gen 10 incubate at 37°C with shaking
# Add 10μL of ethyl acetate concentrated signal to a small glass vial and allow to evaporate in a well ventilated area
# At OD<sub>600</sub> ~0.2-0.3 induce R expression by adding 0.25% arabinose (25μL in 10mL), continue shaking at 37°C
# During this shaking period label chloroform-resistant tubes or 96 well plate with sample names and dilutions  For ease of handling large numbers of eppendorf tubes, we load them in a rack, wrap saran wrap around the tubes + rack, secure the ends with packing tape, and shake the entire rack in the 37°C shaker. Saran wrap can be easily cut off using scissors at the end of the experiment.  
# At OD600 ~0.5, aliquot 100μL into the vial containing (now) dried signal, and appropriate volumes for tubes containing NOT containing the acyl-HSL sample/standard
# Perform desired dilutions across the samples
# Shake eppendorf tubes for 1.5 hours at 37°C
# After 2 hours of growth add 10% (10μL in 100μL) chloroform to stop growth and lyse cells)
# Shake samples for 30 seconds and let them sit for 10 minutes at room temp.
# Take the top most 5μL from each sample and add it to a corresponding well of an Optiplate™ 96 well plate
# Make a 1:100 mixture of Tropix® Galacton-Plus and Tropix® Galacto Reaction Buffer Diluent and add 35μL to each well containing a sample.  
# Place the plate in a dark place at room temp for one hour (a seldom opened drawer works well)
# After one hour dark sit, add 50μL of Tropix Accelerator and read on plate reader.  (luminescence, 1000ms, 3 second shake between reads)
 
====C4·HSL via pECP61.5====
 
# Add 10μL of ethyl acetate concentrated signal to a small glass vial and allow to evaporate in a well ventilated area
# Label chloroform-resistant tubes or 96 well plate with sample names and dilutions For ease of handling large numbers of eppendorf tubes, we load them in a rack, wrap saran wrap around the tubes + rack
# Calculate OD<sub>600</sub> of overnight reporter strain + antibiotic
# Subculture to desired volume at low density (~0.025) into 10mL 1X minimal A media + 10 μL Amp100 + 1μL IPTG
# Add 100μL into the vial containing (now) dried signal, and appropriate volumes for tubes containing NOT containing the acyl-HSL sample/standard
# Perform desired dilutions across the samples
# Secure the ends with packing tape, and shake the entire rack in the 37°C shaker. Saran wrap can be easily cut off using scissors at the end of the experiment.
# After 5 hours of growth add 10% (10μL in 100μL) chloroform to stop growth and lyse cells)
# Shake samples for 30 seconds and let them sit for 10 minutes at room temp.
# Take the top most 5μL from each sample and add it to a corresponding well of an Optiplate™ 96 well plate
# Make a 1:100 mixture of  Tropix® Galacton-Plus and Tropix® Galacto Reaction Buffer Diluent and add 35μL to each well containing a sample.
# Place the plate in a dark place at room temp for one hour (a seldom opened drawer works well)
# After one hour dark sit, add 50μL of Tropix Accelerator and read on plate reader. (luminescence, 1000ms, 3 second shake between reads)

Latest revision as of 15:25, 29 April 2015

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AHL Signal measuring

Assay for acyl-HSL detection using E. coli reporters containing pQF50- (QS-controlled lacZ fusion, Ampicillin) and pJN105- (arabinose inducible R gene, gentamicin) derived plasmids.

Principle

(add something here)

Materials Needed

  • Spectrophotometer capable of reading 600 nm
  • Plate reader
  • Vortex
  • 10mL test tube(s)
  • eppendorf tubes (or chloroform resistant 96well plate)
  • Sterile Cuvets
  • Glass vial
  • Nanopure H20
  • Chloroform
  • β-gal assay reagents

Protocol

  • Inoculate overnight culture of reporter in LB plus respective antibiotics (10 μL Amp, 10μL 100 Gen 20 for pSC11 pJ105L / 10μL Amp 100 for pECP61.5) at 37C.

3OC12·HSL via pSC11 pJ105L

  1. Calculate OD600 of overnight reporter strain + antibiotics
  2. Subculture to desired volume at low density (~0.025) into 10mL LB + 10 μL Amp100, 10μL Gen 10 incubate at 37°C with shaking
  3. Add 10μL of ethyl acetate concentrated signal to a small glass vial and allow to evaporate in a well ventilated area
  4. At OD600 ~0.2-0.3 induce R expression by adding 0.25% arabinose (25μL in 10mL), continue shaking at 37°C
  5. During this shaking period label chloroform-resistant tubes or 96 well plate with sample names and dilutions For ease of handling large numbers of eppendorf tubes, we load them in a rack, wrap saran wrap around the tubes + rack, secure the ends with packing tape, and shake the entire rack in the 37°C shaker. Saran wrap can be easily cut off using scissors at the end of the experiment.
  6. At OD600 ~0.5, aliquot 100μL into the vial containing (now) dried signal, and appropriate volumes for tubes containing NOT containing the acyl-HSL sample/standard
  7. Perform desired dilutions across the samples
  8. Shake eppendorf tubes for 1.5 hours at 37°C
  9. After 2 hours of growth add 10% (10μL in 100μL) chloroform to stop growth and lyse cells)
  10. Shake samples for 30 seconds and let them sit for 10 minutes at room temp.
  11. Take the top most 5μL from each sample and add it to a corresponding well of an Optiplate™ 96 well plate
  12. Make a 1:100 mixture of Tropix® Galacton-Plus and Tropix® Galacto Reaction Buffer Diluent and add 35μL to each well containing a sample.
  13. Place the plate in a dark place at room temp for one hour (a seldom opened drawer works well)
  14. After one hour dark sit, add 50μL of Tropix Accelerator and read on plate reader. (luminescence, 1000ms, 3 second shake between reads)

C4·HSL via pECP61.5

  1. Add 10μL of ethyl acetate concentrated signal to a small glass vial and allow to evaporate in a well ventilated area
  2. Label chloroform-resistant tubes or 96 well plate with sample names and dilutions For ease of handling large numbers of eppendorf tubes, we load them in a rack, wrap saran wrap around the tubes + rack
  3. Calculate OD600 of overnight reporter strain + antibiotic
  4. Subculture to desired volume at low density (~0.025) into 10mL 1X minimal A media + 10 μL Amp100 + 1μL IPTG
  5. Add 100μL into the vial containing (now) dried signal, and appropriate volumes for tubes containing NOT containing the acyl-HSL sample/standard
  6. Perform desired dilutions across the samples
  7. Secure the ends with packing tape, and shake the entire rack in the 37°C shaker. Saran wrap can be easily cut off using scissors at the end of the experiment.
  8. After 5 hours of growth add 10% (10μL in 100μL) chloroform to stop growth and lyse cells)
  9. Shake samples for 30 seconds and let them sit for 10 minutes at room temp.
  10. Take the top most 5μL from each sample and add it to a corresponding well of an Optiplate™ 96 well plate
  11. Make a 1:100 mixture of Tropix® Galacton-Plus and Tropix® Galacto Reaction Buffer Diluent and add 35μL to each well containing a sample.
  12. Place the plate in a dark place at room temp for one hour (a seldom opened drawer works well)
  13. After one hour dark sit, add 50μL of Tropix Accelerator and read on plate reader. (luminescence, 1000ms, 3 second shake between reads)
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