Checking our ligases

Because we couldn't be sure of the results of yesterday experiment, we decided to carry it out one more time.

Digestion

Before excision

After ecxision

DNA used for digestion: MP101
2 digestion were carried out:

• one with EcoRI (D202), that cuts the plasmid only one time
• the other with BspHI (D203), that cuts the plasmid three times

Reaction mixture

• 10 µL of DNA
• 6µL of 10X buffer 2
• 0,6 µL of 100X BSA
• 2 µL of enzyme (EcoRI or BspHI)
• 41,4 µL of water

2h30 at 37°C and then 20 min at 65°C

Purification

After purification

D202 (EcoRI digestion) was purified in 2 ways:

• by gel extraction
• or by column

D203 (BspHI digestion) was purified:

• by column

Elution in 30 µL of EB buffer

Ligation