1. Transfer cells to a 15 ml tube. 2. Add 5 ml TBS- to flasks, shake & pour into tubes. 3. Spin down the cells @ 1K RPM for 5'. 4. Resuspend in 1 ml TBS-. 5. Transfer to 1.5 ml tubes. 6. Spin down @ 14K RPM for 2-3', remove supernatant. 7. Resuspend in 100 µl buffer I (250 mM Tris pH 7.8/5 mM EDTA). 8. Freeze-thaw 3x (10'freeze-10'thaw). 9. Spin down debris @ 14K RPM for 5'. 10. Transfer 100 µl supernatant to a new set of tubes. 11. Set new set of tubes and add 10 µl of supernatant and 50 µl buffer I in each. 12. Add 20 µl of 5mM chloramphenicol in buffer I(or 20 µl of buffer I for a blank). 13. Incubate 5 min @ 37℃ 14. Make the following mix: 0.75 µl of 4mM acetyl CoA 2.0 µl 750 µM HCl (10X) 16.25 µl H2 O 1.0 µl 3H acetyl-CoA (Times number of samples) 15. Add 20 µl of mix into each tube (reaction & blank). 16. Incubate for 2 hrs @ 37℃. 17. Add 500 µl of toluene to each tube. 18. Vortex for 10 sec. 19. Spin down for 1 min. 20. Remove 400 µl into scintillation tubes. 21. Add 10 ml of scintillation liquid. 22. Count it for 2 min. (total cpm's in reaction is 210000-230000) |
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