Materials

iGEM 2018 distribution kit

ddH₂O

Protocol

1. Add 10μL of ddH₂O to the desired well
2. Pipette up and down 3-5 times
3. Incubate at room temperature for 10 minutes
4. Transform cells with 1μL of rehydrated DNA as per transformation protocol. Store the remaining amount at -20°C

Materials

Synthesized DNA from IDT or Genscript

ddH₂O

Protocol

1. Centrifuge tube containing the synthesized DNA for 1 minute at 3000g
2. Add 20μL ddH₂O
3. Vortex for 1 minute
4. Incubate at 50°C for 15 minutes
5. Briefly centrifuge. Store at -20°C

Materials

Luria-Bertani broth with agar:

• 10% (w/v) tryptone
• 5% (w/v) NaCl
• 10% (w/v) yeast extract
• 15% (w/v) agar

Appropriate antibiotic:

• Ampicillin (final concentration of 100μg/mL)
• Chloramphenicol (final concentration of 25μg/mL)
• Kanamycin (final concentration of 50μg/mL)

dH₂O

1500mL Erlenmeyer flask

Stir bar

Aluminum foil

Protocol

1. In a 1500mL Erlenmeyer flask, add 10g tryptone, 5g yeast extract, 10g NaCl and 15g agar. Dissolve solids in 1000mL dH₂O and add a stir bar
2. Cover flask loosely with aluminum foil, secure with autoclave tape and sterilize by autoclaving
3. Remove agar from autoclave and allow agar to cool until warm to the touch before adding appropriate antibiotic
4. Stir on hot plate and magnetic stirrer for 30 seconds
5. Pour agar into plates using aseptic technique

Materials

Luria-Bertani agar plate with appropriate antibiotic (if required)

Overnight culture of desired bacteria

70% ethanol

Spreading rod

Protocol

1. Using aseptic technique, pipette 100μL of bacterial culture onto agar plate
2. Dip spreading rod in 70% ethanol, pass over flame, and allow for excess liquid to burn off. Cool rod on agar, avoiding bacterial culture
3. Use rod to spread bacterial culture over entire plate, spinning the plate at the same time
4. Dip spreading rod in 70% ethanol, pass over flame, and allow excess liquid to burn off
5. Incubate plates at 37°C overnight or until growth is observed

Materials

Escherichia coli DH5-α cells

Luria-Bertani broth

125mm culture tubes

250mL Erlenmeyer flasks

50mL Falcon tubes, pre-chilled

1M KCl

1M MgSO₄

100mM CaCl₂

100mM CaCl₂, 10% glycerol

0.5mL microcentrifuge tubes, pre-chilled

Protocol

1. Inoculate 2mL of Luria-Bertani broth with E. coli DH5-α cells and incubate overnight at 37°C, shaking at 200 rpm
2. Subculture 1mL of the E.coli overnight culture in 49mL fresh Luria-Bertani broth in a 250mL Erlenmeyer flask with 500μL 1M MgSO₄ and 50μL 1M KCl
3. Incubate at 37°C, shaking at 200 rpm until the subculture reaches OD₆₀₀ of 0.4-0.6
4. Chill on ice for at least 10 minutes
5. Spin down cells in 50mL pre-chilled Falcon tube at 2500g for 8 minutes at 4°C
6. Resuspend cells in 10mL cold 100mM CaCl₂, gently mix and place on ice for 10 minutes
7. Centrifuge at 2500g for 8 minutes at 4°C
8. Resuspend cells in 500μL cold 100mM CaCl₂, 10% glycerol and place on ice for 10 minutes
9. Separate cells into 50μL aliquots in pre-chilled 0.5mL microcentrifuge tubes and store at -80°C

Materials

Chemically competent E. coli DH5-α aliquots

DNA for transformation

Luria-Bertani broth with and without appropriate antibiotic

Agar plate with appropriate antibiotic

Protocol

1. Thaw aliquot of competent E. coli DH5-α cells on ice
2. Add 0.3-1μg DNA to cells (maximum 5μL), flick gently to mix, and place on ice for 45 minutes
3. Heat shock at 42°C for 1 minute
4. Place on ice for 5 minutes
5. Add 250μL plain Luria-Bertani medium to aliquot of cells
6. Incubate cells at 37°C, shaking at 200 rpm for 60 to 90 minutes
7. Plate 100μL of resuspended culture on agar plate with appropriate antibiotic and spread
8. Incubate plates at 37°C overnight or until desired growth is observed

Materials

Overnight culture of transformed bacteria

Sterile 1.5mL microcentrifuge tubes

Sterile 50% glycerol

Protocol

1. Using aseptic technique, pipette 0.5mL of 50% sterile glycerol into a 1.5mL microcentrifuge tube
2. Using aseptic technique, add 0.5 mL of overnight culture
3. Pipette up and down gently to mix
4. Store at -80°C

Materials

Overnight culture of bacteria

Resuspension buffer (stored at 4°C)

• 50mM Tris-HCl, pH 8
• 10mM EDTA
• 100μg/mL RNase A

Lysis buffer

• 200mM NaOH
• 1% (v/v) SDS

Precipitation buffer

• 3M CH₃CO₃K, pH 5.5

Isopropanol

70% ethanol, ice cold

2mL microcentrifuge tubes

1.5mL microcentrifuge tubes

ddH₂O

Protocol

1. Transfer 2mL of the overnight culture to a 2mL microcentrifuge tube and pellet the cells by spinning at 3500g for 1 minute. Discard supernatant, and repeat as necessary
2. Resuspend pellet in 300μL Resuspension buffer
3. Add 300μL Lysis buffer. Invert gently
4. Quickly add 300μL Precipitation buffer. Invert gently
5. Centrifuge at 14,000g for 10 minutes at room temperature
6. Retain supernatant in a clean 1.5mL microcentrifuge tube
7. Add 650μL isopropanol. Gently invert and incubate at room temperature for 10 minutes
8. Centrifuge at 14,000g for 10 minutes at  4°C. Discard supernatant
9. Wash pellet with 500μL cold 70% ethanol (do not resuspend)
10. Centrifuge at 14,000g for 5 minutes at 4°C. Discard supernatant
11. Dry pellet in vacufuge for 30 to 60 minutes
12. Resuspend pellet in ddH₂O and store at - 20°C

Materials

DNA

Restriction enzymes

10X appropriate buffer

ddH₂O

0.2mL PCR tubes

Protocol

1. Add the following into a 0.2mL PCR tube:
• 1-3μg DNA
• 1μL restriction enzyme 1
• 1μL restriction enzyme 2
• 2μL 10X appropriate buffer
2. Incubate at 37°C for one to three hours
3. Deactivate restriction enzymes via heat shock by incubating tube at 80°C for 20 minutes

Materials

DNA sample that has already been digested once with the desired enzyme(s), gel purified, or DNA sample that has been isolated from HEK293T cells

3M sodium acetate, pH 5.2

100% cold ethanol

ddH₂O

Protocol

1. Add the following to your sample, in this order
• 1/10 volume of 3M sodium acetate
• 2-3 volumes of 100% ethanol
2. Mix and freeze at -80°C for 30-60 minutes
3. Spin at 14,000 rpm for 30 minutes at 4°C
4. Discard supernatant
5. Dry the pellet in vacufuge for 15-30 minutes
6. Resuspend in ddH₂O and store at -20°C