Difference between revisions of "Team:SVCE Chennai/Project"

1. Spin the cell culture in a centrifuge to pellet the cells, empty the supernatant (media) into a waste collection container.
2. Resuspend pelleted bacterial cells in 250 µl Buffer P1 (kept at 4°C) and transfer to a microcentrifuge tube.  
3. Add 250μl Buffer P2 and gently invert the tube 4–6 times to mix. Do not vortex, as this will result in shearing of genomic DNA.
4. Add 350μl Buffer N3 and invert the tube immediately and gently 4–6 times.
5. Centrifuge for 10 min at 13,000 rpm (~17,900 x g) in a table-top microcentrifuge. A white pellet will form.
6. Apply the supernatants from step 4 to the QIAprep spin column by decanting or pipetting.
7. Centrifuge for 30–60 s. Discard the flow-through.
8. Wash the QIAprep spin column by adding 0.5ml Buffer PB and centrifuge for 30-60s. Discard the flow-through.
9. Wash QIAprep spin column by adding 0.75 ml Buffer PE and centrifuging for 30–60s. 
   Spinning for 60 seconds produces good results.
10. Discard the flow-through, and centrifuge for an additional 1 min to remove residual wash buffer.
11. Place the QIAprep column in a clean 1.5 ml microcentrifuge tube. To elute DNA, add 50μl Buffer EB (10 mM Tris·Cl, pH 8.5) or water to the center of each QIAprep spin column, let stand for 1 min, and centrifuge for 1 min.

1. Excise the dna fragment from the gel with a clean, sharp scalpel. Weigh the gel slice and transfer to a 1.5 ml microfuge tube.

2. Add 400µl of binding buffer 2 for each 100mg of gel weight. Incubate at 50˚C to 60˚ for 10mins and shake occasionally until the agarose is completely dissolved. For high concentration gels 700µl of binding buffer 2 per mg of agarose gel are added.

3. Add the above mixture to the EZ-10 column and let stand for two minutes. Centrifuge at 10,000 rpm for two minutes and discard the flow-through in the tube.

4. Add 750 µl of wash solution and centrifuge at 10,000rpm for 1 minute. Discard the solution in the tube.

5. Repeat step 4. Centrifuge at 10,000rpm for an additional minute to remove any residual wash buffer.

6. Place the column in a clean 1.5 ml microfuge tube. Add 30-50 µl of elution buffer to the centre of the column and incubate at room temperature for 2minutes. Centrifuge at 10,000rpm for 2minutes to elute the dna.

7. Store purified dna at -20˚C.

• Inoculate 250ml of SOB medium with 1 ml vial of seed stock and grow at 20°C to an OD 600nm of 0.3. Use the "cell culture" function on the Nanodrop to determine OD value. OD value = 600nm Abs reading x 10.
• Fill an ice bucket halfway with ice. Use the ice to pre-chill as many flat bottom centrifuge bottles as needed.
• Transfer the culture to the flat bottom centrifuge tubes. Weigh and balance the tubes using a scale
• Centrifuge at 3000g at 4°C for 10 minutes in a flat bottom centrifuge bottle.
• Decant supernatant into waste receptacle, bleach before pouring down the drain.
• Gently resuspend in 80ml of ice cold CCMB80 buffer

1. Pick single colonies into 2 ml of SOB medium and shake overnight at 23°C.

2. Add glycerol to 15%.

3. Aliquot 1ml of sample to nanocryotubes.

4. Place tubes into zip lock bag, immerse bag into dry ice or ethanol bath for 5 minutes.

5. Place in -80 °C freezer.

1. Thaw competent cells on ice. Do not refreeze unused thawed cells, as it will drastically reduce transformation efficiency.

2. Pipette 50μl of competent cells into 2ml tube. Tubes should be labeled, prechilled, and place in a floating tube rack for support. Keep all tubes on ice. Don’t forget a 2ml tube for your control.

3. Pipette 1μl of resuspended DNA into 2ml tube.Gently pipette up and down a few times. Keep all tubes on ice.

4. Pipette 1μl of control DNA into 2ml tube.Gently pipette up and down a few times. Keep all tubes on ice.

5. Close 2ml tubes, incubate on ice for 30min. Tubes may be gently agitated/flicked to mix solution, but return to ice immediately.

6. Heat shock tubes at 42°C for 1 min.2ml tubes should be in a floating foam tube rack. Place in water bath to ensure the bottoms of the tubes are submerged. Timing is critical.

7. Incubate on ice for 5min. Return transformation tubes to ice bucket.

8. Pipette 200μl SOC media to each transformation.

9. Incubate at 37°C for 2 hours, shaker or rotor recommended:

10. Pipette each transformation on two petri plates for a 20μl and 200μl plating. Spread with sterilized spreader or glass beads immediately. This helps ensure that you will be able to pick out a single colony.

11. Incubate transformations overnight at 37°C.

12. Pick single colonies from transformations.Do a colony PCR to verify part size, make glycerol stocks, grow up cell cultures and miniprep.

13. Count colonies for control transformation on the 20μl control plate and calculate competent cell efficiency. Competent cells should have an efficiency of 1.5x10^8 to 6x10^8 cfu/μg DNA.

1. Make the melted agarose solution. To make a 1% gel in the small gel tray, use 0.35 grams of agarose in 35 mL of buffer.0.35g / 35ml = 0.01 or 1%. Put the agarose in a 250 ml erlenmyer flask. In a graduated cylinder, measure out the appropriate volume of 0.5 X TBE Buffer for the appropriate size gel tray and pour it into the flask. Microwave for 30 sec then swirl, and then microwave another 30 sec, or until it boils but before it tries to bubble out of the flask. Use a paper towel or flask holder to grab the flask (watch out, it’s hot!) and swirl it around well.

1. 2.Tape up the open ends of the gel tray with lab labeling tape. Also, combs are chosen and kept into the slots on the tray.

2. 4. Add Ethidium Bromide (EtBr is toxic, so avoid creating toxic vapor by adding EtBr to hot liquid) before pouring it into the tray.

6. The final concentration of EtBr in the gel should be about 0.3 - 0.5 ug/mL.

7. Cast the gel. Pour the slurry slowly into the taped gel tray. Let the tray stand on a level surface for about 20 minutes.

8. While waiting for the gel to set, thaw the :

3. 6 X loading dye/buffer

4. DNA ladder/molecular marker

5. DNA samples

9. Carefully lift up the combs from the hardened gel. Remove the tape from the sides and place the entire tray into the gel box/tank.

6. Place the gel tray containing the hardened gel into the box/tank so that the top of the gel (top = the end with the wells nearest to the edge) is at the negative (black) electrode-end of the tank. Pour enough 0.5 X TBE into the tank such that the gel is completely submerged.

10. Mix the DNA with the loading dye and load the wells. About 1μl of dye is added for every of DNA.

11. After loading the wells, Ethidium Bromide is added to the positive end (red electrode, or end opposite the wells in the gel) of the gel tank.

12. Place the lid on the gel tank and be sure the electrode connections are secure and tight.

13. Turn on the power supply by flipping the switch. Voltage is set at 60V.

14. Gel is allowed to run for 20-30 minutes.

15. Gel is viewed under UV and picture is taken.

1. Add 250ng of DNA to be digested, and adjust with dH2O for a total volume of 16μl.

2. Add 2.5μl of NEBuffer 2.

3. Add 0.5μl of BSA.

4. Add 0.5μl of EcoRI.

5. Add 0.5μl of PstI.

6. There should be a total volume of 20μl. Mix well and spin down briefly.

7. Incubate the restriction digest at 37°C for 30min, and then 80°C for 20min to heat kill the enzymes.

8. Run a portion of the digest on a gel (8μl, 100ng), to check that both plasmid backbone and part length are accurate.

1. Add 2μl of digested plasmid backbone(25ng) to an eppendorf on ice.

2. Add equimolar amount of restricted DNA fragments to the eppendorf.

3. Add 1μl T4 DNA ligase buffer.

4. Add 0.5μl T4 DNA ligase enzyme and make up the volume to 10μl using double distilled water.

5.Incubate the reaction at 16°C for 30 minutes.

6.Heat kill the enzyme at 80°C for 20 minutes.

1. Transform the plasmid into competent cell and plate them.

2. Transfer 2-3 transformed colonies to seven 5ml LB broth and incubate for 3hrs.

3. Add each 5ml culture to seven 250ml LB Kan+ broth .

1. 4.Study growth kinetics with one broth and when in log phase add IPTG to 250ml LB Kan+ broth at various concentration required.

2. 5.Transfer competent cell to one 250ml LB broth.

3. 6.For every 2 hrs take 30ml of sample to study the minicell phenotypic expression.

4. 7.Centrifuge at 2000xg for 10mins and collect the supernatant.

9. Centrifuge at 1000xg for 10mins and discard the supernatant.

10. To the pellet add 10ml LB broth and incubate for 40minutes in shaker incubator.

11. Add ceftriazone to a final concentration of 100 μg/ml and incubate for 45minutes.

12. Centrifuge at 400xg for 10minutes collect the supernatant.

13. Centrifuge the supernatant at 1000xg for 10 minutes.

14. Wash the pellet in saline buffer twice and suspend in buffer and plate them in LB Kan+ plate.

Functionality Assay:

1. Dip a sterile swab into the inoculum tube.

2. Rotate the swab against the side of the tube using firm pressure, to remove excess fluid. The swab should not be dripping wet.

3. Inoculate the dried surface of a MH agar plate by streaking the swab three times over the entire agar surface; rotate the plate approximately 60 degrees each time to ensure an even distribution of the inoculum.

4. Rim the plate with the swab to pick up any excess liquid.

5. Discard the swab into an appropriate container.

6. Leave the plate to sit at room temperature at least 3 to 5 minutes, but no more than 15 minutes, for the surface of the agar plate to dry before proceeding to the next step.

7. Place the appropriate antimicrobial-impregnated disks on the surface of the agar, using either forceps to dispense each antimicrobial disk one at a time, or a multidisk dispenser to dispense multiple disks at one time.

8. Once all disks are in place, replace the lid, invert the plates, and place them in a 35°C air incubator for 16 to 18 hours.

Standard PCR reaction

1.CCMB80 buffer

- 10 mM KOAc pH 7.0 (10 ml of a 1M stock/L)

- 80 mM CaCl₂.2H₂O (11.8 g/L)

- 20 mM MnCl₂.4H₂O (4.0 g/L)

- 10 mM MgCl₂.6H₂O (2.0 g/L)

- 10% glycerol (100 ml/L)

- adjust pH DOWN to 6.4 with 0.1N HCl if necessary

- adjusting pH up will precipitate manganese dioxide from Mn containing solutions.

- sterile filter and store at 4°C

- slight dark precipitate appears not to affect its function

2. SOC

- SOB

- 20 mM glucose(0.36g/100ml)

3.SOB medium(100ml)

- 0.5% (w/v) yeast extract

- 2% (w/v) tryptone

- 10 mM NaCl(0.0584g)

- 2.5 mM KCl(0.0186g)

- 20 mM MgSO₄ (0.240g)

4. Buffer P1

• 50 mM Tris-HCl pH 8.0
• 10 mM EDTA
• 100 μg/ml RNaseA

Prep - Dissolve 6.06g Tris base, 3.72g EDTA-2H₂0 in 800mL dH20. Adjust the pH to 8.0 with HCl. Adjust the volume to 1 liter with dH₂ O. Add 100mg RNase A per liter of P1.

5. Buffer P2

• 200 mM NaOH
• 1% SDS

· Dissolve 8.09g of NaOH pellets in 950mL dH₂O, 50mL 20% SDS solution. The final volume should be 1 liter.

6. Buffer N3 (100ml)

• 4.2 M Gu-HCl (40.12g)
• 0.9 M potassium acetate(8.83g)
• pH 4.8

7. Buffer PB

• 5 M Gu-HCl (47.76g for 100ml)
• 30% isopropanol

8. Buffer PE

• 10 mM Tris-HCl(0.095g/100ml) pH 7.5
• 80% ethanol

9. Buffer EB (10 mM Tris·Cl(0.095g/100ml), pH 8.5)

10. TBE buffer: 10X (1000ml)

Tris 108g

EDTA 9.3g

Boric Acid 55g

pH 8.3

11. TE buffer: 10X

For 100ml

Tris-HCL 0.605g

EDTA 0.372g

pH 7.4

12. TAE Buffer: 1L 10X

Tris 48.5g

Glacial acetic acid 11.4ml

0.5M EDTA 20ml

pH 8

13. Elution Buffer

0.5 M sodium acetate(ph 7)

1 mM EDTA(ph 8)