Team:Valencia/WetLab/YeastTeam/Protocols
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- | ''' | + | '''PROTOCOL OF CITOPLASMATIC Ca2+ INCREASEMENT MEASUREMENT IN ''S. cerevisiae''''' |
- | + | Modified from the original Denis and Cyert (2002) JCB 156; 29-34. | |
Material: | Material: | ||
- | - | + | - pEVP11[AEQ] plasmid: apoaequorina expression (Batiza et al. |
(1996) J.Biol.Chem. 271: 23357-62). | (1996) J.Biol.Chem. 271: 23357-62). | ||
- | - | + | - Coelenterazine solution: Diluted coelenterazine until 590μM in satured N2 metanol. This compound is extremely photosensible and it's inhibited by O2. Keep at –20ºC. |
- | + | ||
- | + | ||
- | + | Note: We bought Coelenterazine, Native (CLZn) 50 μg Ref. C-2230 de | |
- | SIGMA. | + | SIGMA. We put N2 gas into metanol during 5 minutes, and we added inmediately 200μL to the 50μg of coelenterazine. |
- | + | ||
- | - | + | - Luminometer. |
- | - | + | - Luminometer tubes and ELISA plaques. |
- | + | Procedure: | |
- | 1. | + | 1. We recieved pEVP11[AEQ] aequorin transformed yeast from Joaquin Arinyo. |
- | 2. | + | 2. We let growing up o/n in SD lacking Leu medium to maintain plasmid expression. |
- | + | ||
- | 3. | + | 3. After incubation, measure OD a 660nm y calculate the necessary volum to obtain in 250μL a |
- | + | final OD of 1,8. Put that volum into an eppendorf tube with a hole in its tap. | |
- | + | ||
- | 4. | + | 4. Centrifugate 1 minute at 13000rpm. |
- | 5. | + | 5. Discard the supernatant. |
- | 6. | + | 6. Resuspend the pellet into 250μL of fresh medium with coelenterazine 2μM (aprox. 3,5μL of coelenterazinestock solution / μL de medio). |
- | + | ||
- | 7. | + | 7. Incubate during 5,5 horas at ambient temperature, in agitation and keeping in the darkness. |
- | + | ||
- | 8. | + | 8. Centrifugate 1 minute at 13000rpm. Discard the supernatant and resuspend in SD lacking Leu fresh medium without coelenterazine (see the proper volum below *). |
- | + | ||
- | + | ||
- | + | ||
- | 9. | + | 9. Wait 15 min (yeast luminiscence is increased due to a peak of Ca2+ is induced by the glucose (Nakajimashimada et |
- | + | ||
al. (1991) PNAS 88; 6878-82). | al. (1991) PNAS 88; 6878-82). | ||
- | 10. | + | 10. Measure basal luminiscence during 15 minutes. |
- | 11. | + | 11. Add the correct reactive volum to induce luminiscence. |
- | + | In the chase of alcaline induction: | |
- | 8. | + | 8. *Add 170μL of medium. |
- | 9. | + | 9. Add 30μL of KOH 100mM. |
- | + | ||
- | + | ||
- | + | ||
- | + | ||
- | + | Other stress types: | |
- | + | ||
- | + | ||
- | + | ||
- | + | ||
- | + | ||
NaCl: 30μL NaCl 5M (0,75M final). | NaCl: 30μL NaCl 5M (0,75M final). | ||
Line 85: | Line 65: | ||
KCl: 30μL KCl 100mM. | KCl: 30μL KCl 100mM. | ||
- | + | Note: yeasts should be treated secuentialy and in the same way to obtain reproducible results. | |
- | + | ||
<div style="position:absolute; top:150px; left:580px; overflow:hidden;"> | <div style="position:absolute; top:150px; left:580px; overflow:hidden;"> |
Revision as of 11:30, 3 October 2009
Protocol used to make our yeasts produce light
PROTOCOL OF CITOPLASMATIC Ca2+ INCREASEMENT MEASUREMENT IN S. cerevisiae
Modified from the original Denis and Cyert (2002) JCB 156; 29-34.
Material:
- pEVP11[AEQ] plasmid: apoaequorina expression (Batiza et al. (1996) J.Biol.Chem. 271: 23357-62).
- Coelenterazine solution: Diluted coelenterazine until 590μM in satured N2 metanol. This compound is extremely photosensible and it's inhibited by O2. Keep at –20ºC.
Note: We bought Coelenterazine, Native (CLZn) 50 μg Ref. C-2230 de SIGMA. We put N2 gas into metanol during 5 minutes, and we added inmediately 200μL to the 50μg of coelenterazine.
- Luminometer.
- Luminometer tubes and ELISA plaques.
Procedure:
1. We recieved pEVP11[AEQ] aequorin transformed yeast from Joaquin Arinyo.
2. We let growing up o/n in SD lacking Leu medium to maintain plasmid expression.
3. After incubation, measure OD a 660nm y calculate the necessary volum to obtain in 250μL a final OD of 1,8. Put that volum into an eppendorf tube with a hole in its tap.
4. Centrifugate 1 minute at 13000rpm.
5. Discard the supernatant.
6. Resuspend the pellet into 250μL of fresh medium with coelenterazine 2μM (aprox. 3,5μL of coelenterazinestock solution / μL de medio).
7. Incubate during 5,5 horas at ambient temperature, in agitation and keeping in the darkness.
8. Centrifugate 1 minute at 13000rpm. Discard the supernatant and resuspend in SD lacking Leu fresh medium without coelenterazine (see the proper volum below *).
9. Wait 15 min (yeast luminiscence is increased due to a peak of Ca2+ is induced by the glucose (Nakajimashimada et al. (1991) PNAS 88; 6878-82).
10. Measure basal luminiscence during 15 minutes.
11. Add the correct reactive volum to induce luminiscence.
In the chase of alcaline induction:
8. *Add 170μL of medium.
9. Add 30μL of KOH 100mM.
Other stress types:
NaCl: 30μL NaCl 5M (0,75M final).
CaCl2: 30μL CaCl2 1.33M (200mM final).
KCl: 30μL KCl 100mM.
Note: yeasts should be treated secuentialy and in the same way to obtain reproducible results.