Experiments

Describe the experiments, research and protocols you used in your iGEM project.

What should this page contain?

• Protocols
• Experiments
• Documentation of the development of your project

Protocols

Heat shock competent cells preparation

Day 1 Inoculate cells in 3.5mL LB medium. Incubate at 37°C overnight.

Day 2 Measure culture OD at 600nm. Dilute cells in 250mL of LB medium so OD equals to 0.12. Incubate overnight at 20°C and 180rpm.

Day 3 Measure culture OD at 600nm and dilute to obtain OD_600nm=0.6. Cells must be kept at 4°C during all following steps. Put on ice for 10min and centrifuge for 10min at 3000rpm and 4°C. Discard supernatant and resuspend cells in 80mL of fresh TB buffer. Keep on ice for 10min and centrifuge for 10min at 3000rpm and 4°C. Discard supernatant again and resuspend cells in 20mL of fresh TB buffer with 7% of DMSO. Keep on ice for 10min. Aliquot cells and freeze with liquid nitrogen. Keep at -80°C.

TB buffer recipe

Dissolve HEPES, CaCl₂ and KCl in water. Adjust pH to 6.7 with KOH. Add MnCl₂. Filter to sterilize and keep at 4°C.

Heat shock competent cells tranformation

Electro-competent cells preparation

Inoculate 15mL of LB with 200µL of an overnight cell culture. Incubate at 37°C and 180rpm until OD_600nm reaches 0.6. Centrifuge cells for 10 minutes at 4000rpm. Wash twice with 10mL of 10% glycerol. Put cells in 200µL of 10% glycerol and use for electroporation.