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Team:British Columbia/Protocols/Yeast
From 2011.igem.org
iGEM Tips for Success
Things to think about when designing your project and experiments, as well as general safety rules.
Site Directed Mutagenesis
A molecular biology technique in which a mutation is created at a defined site in a DNA molecule.
Bacterial Standard Operating Protocols
How to prepare competent cells, transform your construct into competent cells, and express your protein from a lac promoter.
Yeast Standard Operating Protocols
How to transform your construct into yeast, obtain crude extract for SDS-PAGE, and perform GFP fixation for microscopy and fluorescence-activated cell sorting.
Gas Chromatography-Mass Spectrometry (GC-MS)
A method that combines the features of gas-liquid chromatography and mass spectrometry to identify different substances within a test sample.
Beetle Transfer Experiments
Preliminary experiments to probe the efficiency of transferring yeast via beetle vector.
Yeast-Fungi Co-culture Experiments
Preliminary experiments to investigate the competitive interactions between yeast and the Bluestain Fungus.
Things to think about when designing your project and experiments, as well as general safety rules.
Site Directed Mutagenesis
A molecular biology technique in which a mutation is created at a defined site in a DNA molecule.
Bacterial Standard Operating Protocols
How to prepare competent cells, transform your construct into competent cells, and express your protein from a lac promoter.
Yeast Standard Operating Protocols
How to transform your construct into yeast, obtain crude extract for SDS-PAGE, and perform GFP fixation for microscopy and fluorescence-activated cell sorting.
Gas Chromatography-Mass Spectrometry (GC-MS)
A method that combines the features of gas-liquid chromatography and mass spectrometry to identify different substances within a test sample.
Beetle Transfer Experiments
Preliminary experiments to probe the efficiency of transferring yeast via beetle vector.
Yeast-Fungi Co-culture Experiments
Preliminary experiments to investigate the competitive interactions between yeast and the Bluestain Fungus.
Yeast Transformation
- Grow overnight culture; rotating/shaking at 30 degrees Celsius
- The next day, dilute culture 1/10 and grow at 30 degrees Celsius for 3-4 hours
- Pellet and wash once with 0.1M Lithium Acetate (LiAc)
- Pellet and discard supernatant
- Add in order: 240uL 50% Polyethylene Glycol (PEG), 36uL 1M LiAC, 10uL Boiled Herring Sperm DNA, 50uL of your desired DNA construct (~10ng/uL)
- Vortex until uniform and incubate at 30 degrees Celsius for 30min
- Heat-shock at 42 degrees Celsius for 20min
- Pellet and discard supernatant
- Resuspend with 200uL sterile water and spread on selective media plate
- Incubate plate at 30 degrees Celsius for 3-4 days and you should see colonies!
Yeast Crude Extract for SDS-PAGE
- Grow overnight culture; rotating/shaking at 30 degrees Celsius
- The next day, dilute culture 1/10 and grow at 30 degrees Celsius for 3-4 hours
- Pellet and wash once with sterile water
- Pellet and discard supernatant
- Resuspend in lysis buffer and transfer to capped O-ring tubes
- Add 200uL of tiny glass beads
- Place in lytic beater at 4 degrees Celsius for 7min
- Centrifuge at 4 degrees Celsius for 10min at 13000rpm
- Carefully take the supernatant and transfer to a new microcentrifuge tube
- Add appropriate amount of 5x SDS-PAGE loading buffer
- Store at -20 degrees Celsius
GFP Fixation (from Koshland Website)
- Pellet yeast cells and discard supernatant
- Add 100ul of 4% paraformaldehyde, 3.4% sucrose and vortex
- Incubate at RT for 15min
- Pellet yeast cells and discard supernatant
- Wash once in KPO4/sorbitol (60 ml 2M sorbitol, 10 ml 1M potassium phosphate, 30 ml water)
- resuspend in small volume of KPO4/sorbitol
- Sonicate cells for 3 seconds on setting 3
- Pipette one to three microliters of cells onto coverslip
