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cDNA AMPLIFICATION FROM LAMBDA-PHAGE LIBRARY

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1369

 

PREPARE SOLUTIONS
1. SM buffer (1 L):
Mix 5.8 g of NaCl, 2 g of MgSO4 -7H2 O, 50 mL of 1M Tris-HCl, pH 7.5, 0.5 mL of 2% gelatin, and dH2 O to 1 L (Autoclave)
2. TENS buffer (100 mL):
Mix 5 mL of 1M Tris-HCl, pH 8.0 (50mM), 20 mL of 0.5 mM EDTA (100mM), 2 mL of 5M NaCl (100mM), 3 mL 10% SDS (0.3%), and 71 mL of dH2 O
   
PROCEDURE
1. Plate cells and phage as described (144. cDNA library screening) and let plaques develop
2. Pippet enough SM buffer on plates to barely cover the plate and rock at 4o C for >1 hour
3. Pippet solution containing phage into a tube and add 0.2 mL of 2M ZnCl2 per 10 mL of SM solution

4. Centrifuge for 5 minutes at 5,000 rpms. A gray pellet forms

5. Resuspend pellet in TENS buffer
6. Heat at 65o C for 10 mins
7. Extract with phenol followed by chloroform:isoamyl alcohol
8. Precipitate with isopropanol:sodium acetate

9. Wash pellet with 70% ethanol

10. Resuspend pellet in T1 E0.1 , check DNA concentration and store aliquoted at -20o C

 

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