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Update protocols.md
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mibohl authored Oct 7, 2024
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Expand Up @@ -48,7 +48,7 @@ Note: Try to use smaller vectors containing fewer inserts as reduced protein exp

## Gibson Assembly
1. PCR of all inserts and backbones to create appropriate overhangs
2. DpnI Digest: add 0.5 uL of DpnI to 25 uL PCR reaction, incubation 15 min at 37 °C (to remove the template DNA)
2. DpnI Digest: add 0.5 uL of DpnI to 25 uL PCR reaction, incubation 15 min at 37°C (to remove the template DNA)
3. Gel extraction of the correct PCR products: Follow the protocol of the NucleoSpin Gel and PCR Clean-up kit (Macherey-Nagel)
4. Mix 50–100 ng of vector DNA with a molar 2:1 or 1:1 ratio of each insert (see table below)
5. Add water and NEBuilider HiFi DNA Assembly Master Mix as indicated below
Expand All @@ -60,7 +60,7 @@ Note: Try to use smaller vectors containing fewer inserts as reduced protein exp
| NEBuilider HiFi DNA Assembly Master Mix | 2.5 μl |2.5 μl |
| ddH2O | fill up to 5 μl |fill up to 5 μl |

6. Incubate samples in a thermocycler at 50 °C for 60 minutes
6. Incubate samples in a thermocycler at 50°C for 60 minutes
7. Store samples on ice or at –20°C for subsequent transformation


Expand All @@ -72,14 +72,14 @@ To test our genetically engineered constructs, we transformed them into bacteria
2. Add 1 μl of plasmid DNA or 5 uL of assembly reaction to 20-50 μl of competent cells
3. Flick the tube to mix
4. Incubate mixture on ice for 30 minutes
5. Heat shock at the bacteria at 42 °C for 30 s
5. Heat shock at the bacteria at 42°C for 30 s
6. Place on ice for 5 minutes
7. Pipette 200 µl of room temperature LB into the mixture
8. Incubate at 37 °C for 60 minutes while shaking at 750 rpm
9. Warm selection plates to 37 °C in the incubator
8. Incubate at 37°C for 60 minutes while shaking at 750 rpm
9. Warm selection plates to 37°C in the incubator
10. Spin down bacteria and resuspend in 50 μl LB
11. Spread 50-100 μl of cells on LB agar plates containing the antibiotics for selection. When multiple antibiotics are used, use 0.6x of the standard working concentration for each antibiotic.
12. Incubate overnight at 37 °C
12. Incubate overnight at 37°C

For co-transformations with two accessory plasmids:
1. Thaw competent S2060 cells on ice
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3. Add 2 µl of the ligation reaction into 50 μl of competent S2208 cells
4. Flick the tube to mix
5. Incubate mixture on ice for 30 minutes
6. Heat shock at the bacteria at 42 °C for 30 s
6. Heat shock at the bacteria at 42°C for 30 s
7. Place on ice for 5 minutes
8. Pipette 200 µl of room temperature LB into the mixture
9. Incubate at 37 °C while shaking at 750 rpm until bacteria reach saturation
10. Warm selection plates to 37 °C in the incubator
9. Incubate at 37°C while shaking at 750 rpm until bacteria reach saturation
10. Warm selection plates to 37°C in the incubator
11. Spin down bacteria and resuspend in 50 μl LB
12. Spread 50-100 μl of cells on LB agar plates
13. Incubate overnight at 37 °C
13. Incubate overnight at 37°C

Day 3: Plaque Assay to determine phage titer

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