TIANpure Midi Plasmid Kit

Transcription

1 TIANpure Midi Plasmid Kit For purification of molecular biology grade DNA

2 Kit Contents Storage TIANpure Midi Plasmid Kit Contents RNaseA (10 mg/ml) Buffer BL Buffer P1 Buffer P2 Buffer P3 Buffer PD Buffer PW Buffer TB (Spin Column) Cat.no. DP107 DP μl 30 ml 30 ml 30 ml 40 ml 30ml 15 ml 15 ml Filtration Columns CS 50 Spin Columns CP4 50 Collection Tubes ( 2 ml ) 50 Handbook 1 TIANpure Midi Plasmid Kit can be stored dry at room temperature (15-25 C) for up to 12 months without showing any reduction in performance and quality. For longer storage, it can be stored at 2-8 C. If any precipitate forms in the buffers after storage at 2-8 C, it should be dissolved by warming the buffers to 37 C before use. RNaseA (10mg/ml) can be stored for one year at room temperature. After addition of RNaseA, Buffer P1 is stable for 6 months at 2-8 C. TIANpure Midi Plasmid Kit Handbook 1

3 Introduction TIANpure Midi Plasmid Kit is based on alkaline lysis technology followed by adsorption of DNA onto silica membrane in the presence of high salt. Plasmid DNA purified with TIANpure Midi Plasmid Kit is immediately ready for use. Phenol extraction and ethanol precipitation are not required. High-quality plasmid DNA is eluted in a small volume of Tris Buffer or deionized water. This protocol is designed for purification of up to 40 μg of plasmid DNA from 1-5 ml overnight culture of E. coli in LB (Luria-Bertani) medium. Plasmid DNA prepared by TIANprep Midi Plasmid Kit is suitable for a variety of routine applications including restriction enzyme digestion, sequencing, library screening, ligation and transformation, in vitro translation, and transfection of robust cells. Yield Plasmid Bacterial Plasmid Plasmid Type Cells Volume Yield Low Copy 1-5 ml 3-12 μg pbr322, pacyc, psc101, supercos, pwe15 High Copy 5-15 ml μg ptz, puc, pbs, pgm-t Important Notes 1. Add the provided RNase A solution to Buffer P1, mix, and store at 2-8 C. 2. Add ethanol (96-100%) to Buffer PW before use (check bottle label for volume). For example: Add 60 ml ethanol (96-100%) to 15 ml Buffer PW or add 200 ml ethanol (96-100%) to 50 ml Buffer PW. 3. Check Buffer BL, P2 and P3 before use for salt precipitation. Redissolve any precipitate by warming to 37 C. Do not shake Buffer P2 vigorously. TIANpure Midi Plasmid Kit Handbook 2

4 4. Prevent to contact Buffer P2 and P4 directly. Close the bottle containing Buffer P2 and P4 immediately after use to avoid acidification of Buffer P2 and P4 from CO2 in the air. 5. All centrifugation steps are carried out at 12,000 rpm (~13,400 g) in table-tap microcentrifuge at room temperature. 6. After treated with Buffer BL, use the Spin Column CP4 soon, since long-term placement may affect the purifying effect. 7. Buffer PD can efficiently remove residual protein. This step is essential when working with enda+ strains such as the JM series, HB101 and its derivatives, or any wild-type strain, to ensure that plasmid DNA is not degraded. Protocol 1. Column equilibration: add 500 μl Buffer BL to Spin Column CP4. Centrifuge for 1 min at 12,000 rpm (~13,400 g) in a table-top microcentrifuge. Discard the flow-throw, and place Spin Column CP4 into the collection tube. 2. Harvest 5-15 ml bacterial cells in a microcentrifuge tube by centrifugation at 12,000 rpm (~13,400 g) in a conventional, table-top microcentrifuge for 1 min at room temperature (15-25 C), then remove all traces of supernatant by inverting the open centrifuge tube until all medium has been drained. 3. Resuspend pelleted bacterial cells in 500 μl Buffer P1. Note: Ensure that RNase A has been added to Buffer P1. No cell clumps should be visible after resuspension of the pellet. 4. Add 500 μl Buffer P2 and mix thoroughly by inverting the tube 6-8 times. Note: Mix gently by inverting the tube. Do not vortex, as this will result in shearing of genomic DNA. If necessary, continue inverting the tube until the solution becomes viscous and TIANpure Midi Plasmid Kit Handbook 3

5 slightly clear. Do not allow the lysis reaction to proceed for more than 5 min. 5. Add 700 μl Buffer P3 and mix immediately and thoroughly by inverting the tube 6-8 times. The solution should become cloudy. Note: To avoid localized precipitation, mix the solution thoroughly, immediately after addition of Buffer P3. 6. Centrifuge for 10 min at 12,000 rpm (~13,400 g) in a tabletop microcentrifuge. A compact white pellet will form. 7. Apply the supernatants from step 6 to Filtration Column CS (place the CS in a collection tube) by decanting or pipetting. Centrifuge for 2 min at 12,000 rpm (~13,400 g) in a table-top microcentrifuge. 8. Apply the supernatants from step 6 to the Spin Column CP4 (place the CP4 in a collection tube) by decanting or pipetting. Centrifuge for 1 min at 12,000 rpm (~13,400 g). Discard the flow-through. 9. Wash the Spin Column CP4 by adding 500ul Buffer PD and centrifuging for 1 min at 12,000 rpm (~13,400 g). Discard the flow-through. 10. Wash the Spin Column CP4 by adding 700 µl Buffer PW (ensure the ethanol (96%-100%) has been added to Buffer PW) and centrifuging for 1 min at 12,000 rpm (~13,400 g). Discard the flow-through. 11. Wash Spin Column CP4 by adding 500 µl Buffer PW and centrifuging for 1 min at 12,000 rpm (~13,400 g). 12. Discard the flow-through, and centrifuge for an additional 2 min at 12,000 rpm (~13,400 g) to remove residual wash buffer PW. Note: Residual wash buffer will not be completely removed TIANpure Midi Plasmid Kit Handbook 4

6 unless the flow-through is discarded before this additional centrifugation. We suggest open CP4 lid and stay at room temperature for a while. Residual ethanol from Buffer PW may inhibit subsequent enzymatic reactions. 13. Place the Spin Column CP4 in a clean 1.5 ml microcentrifuge tube. To elute DNA, add μl Buffer TB or water (ph ) to the center of each Spin Column CP4, let stand for 2 min, and centrifuge for 1 min at 12,000 rpm (~13,400 g). Note: Repeat step 13 to increase plasmid callback efficiency. If the volume of eluted buffer is less than 1ml, it may affect recovery efficiency. The ph value of eluted buffer will have some influence in eluting; Buffer TB or distilled water (ph ) is suggested to elute plasmid DNA. For long-term storage of DNA, eluting in Buffer TB and storing at 20 C is recommended, since DNA stored in water is subject to acid hydrolysis. Ordering Information Molecular Biological Reagents Ampicillin, Sodium salt 5ml(100mg/ml) RT501 Kanamycin sulfate 5ml(10mg/ml) RT503 Transfection Reagents TIANpure Midi Plasmid Kit Handbook 5

7 Lipofect Transfection Reagent 0.5ml 5ml RM RM DNAfectin Transfection Reagent 0.75ml ml RM RM Cloning pgm-t Ligation Kit (contain vector, ligase) 50preps 100preps VT VT PCR Cleanup & Gel Extraction Universal DNA Purification Kit 200 preps DP DP TIANquick Midi Purification Kit 200 preps DP DP TIANgel Midi Purification Kit 200 preps DP DP TIANpure Midi Plasmid Kit Handbook 6