Protocols

Describe the research, experiments, and protocols you used in your iGEM project. These should be detailed enough for another team to repeat your experiments.

链接

1. Perform agarose gel/ethidium bromide electrophoresis to fractionate DNA fragments. Any type or grade of agarose may be used. However, it is strongly recommended that fresh TAE buffer or TBE buffer be used as running buffer. Do not reuse running buffer as its pH will increase and reduce yields.
2. When adequate separation of bands has occurred, carefully excise the DNA fragment of interest using a wide, clean, sharp scalpel. Minimize the size of the gel slice by removing extra agarose.
3. Determine the appropriate volume of the gel slice by weighing it in a clean 15 mL microcentrifuge tube. Assuming a density of 1 g/mL, the volume of gel is derived as follows: a gel slice of mass 0.3 g will have a volume of 0.3 mL
4. Add1 volume Binding Buffer (XP2).
5. Incubate at 50-60C for 7 minutes or until the gel has completely melted. Vortex or shake the tube every 2-3 minutes.
6. Insert a HiBind* DNA Mini Column in a 2 mL Collection Tube.
7. Add no more than 700 uL DNA/agarose solution from Step5 to the HiBind DNA Mini Column.
8. Centrifuge at 10，000＊g for 1 minute at room temperature.
9. Discard the filtrate and reuse collection tube.
10. Repeat Steps 7-9 until all of the sample has been transferred to the column.
11. Add 300 uL Binding Buffer (XP2).
12. Centrifuge at maximum speed (>=13,000 x g) for 1 minute at room temperature.
13. Discard the filtrate and reuse collection tube.
14. Add 700 uL SPW Wash Buffer.
15. Centrifuge at maximum speed for 1 minute at room temperature.
16. Discard the filtrate and reuse collection tube.
17. Centrifuge the empty HiBind DNA Mini Column for 2 minutes at maximum speed to dry the column matrix. Note: It is important to dry the HiBind DNA Mini Column matrix before elution.Residual ethanol may interfere with downstream applications.
18. Transfer the HiBind DNA Mini Column to a clean 15 mL microcentrifuge tube.
19. Add 15-30 uL Elution Buffer or deionized water directly to the center of the column membrane.
20. Let sit at room temperature for 2 minutes.
21. Centrifuge at maximum speed for 1 minute.
22. Store DNA at -20”C.

质粒

1. Isolate a single colony from a freshly streaked selective plate, and inoculate a culture of 1- 5 mLLB medium containing the appropriate selective antibiotic. lnocubate for~12-16hours at 37C with vigorous shaking (~ 300 rpm). Use a 10-20 mL culture tube or a flask with a volume of at least 4 times the volume of the culture. It is strongly recommended that an endA negative strain of E. coli be used for routine plasmid isolation. Examples of such strains include DH5a* and JM1O9.
2. Centrifuge at 10,O0Ox g for 1 minute at room temperature.
3. Decant or aspirate and discard the culture media.
4. Add 250 uL Solution I/RNase A. Vortex or pipet up and down to mix thoroughly.Complete resuspension of cell pellet is vital for obtaining good yields.
5. Transfer suspension into a new 15 mL microcentrifuge tube.
6. Add250 uL Solution IL Invert and gently rotate the tube several times to obtain a dear lysate. A 2-3minute incubation may be necessary.
7. Add 350uL Solution I Immediately invert several times until a flocculent white precipitate forms.
8. Centrifuge at maximum speed (213,000 x g) for 10 minutes. A compact white pellet will form. Promptly proceed to the next step.
9. Insert a HiBinde DNA Mini Column into a 2 mL Collection Tube.
10. Transfer the cleared supernatant from Step 8 by CAREFULLY aspirating it into the HiBind* DNA Mini Column. Be careful not to disturb the pellet and that no cellular debris is transferred to the HiBind" DNA Mini Column.
11. Centrifuge at maximum speed for 1 minute.
12. Discard the filtrate and reuse the collection tube.
13. Add 500 uL HBC Buffer.
14. centrifuge at maximum speed for 1 minute.
15. Discard the filtrate and reuse collection tube.
16. Add 700uL DNA Wash buffer.
17. Centrifuge at maximum speed for 1 minute.
18. Discard the filtrate and reuse the collection tube.
19. Centrifuge the empty HiBind" DNA Mini Column for 2 minutes at maximum speed to dry the column matrix.
20. Transfer the HiBind DNA Mini Column to a clean 1.5 mL microcentrifuge tube.
21. Add 30100 uL Elution Buffer or sterile deionized water directly to the center of the column membrane.
22. Let sit at room temperature for 1 minute.
23. Centrifuge at maximum speed for 1 minute. Note: This represents approximately 7O% of bound DNA. An optional second elution will yield any residual DNA, though at a lower concentration
24. Store DNA at -20C.