Team:HokkaidoU Japan/Notebook/aggregation Week 5

digestion

I tried to digest the mini-prep products again, and after Ethanol precipitation, we did electrophoresis.

digestion result

transformation

I think that the E. coli which we use transformation is BL21(DE3)pLysS. So, the E. coli could multiplication increase on LBC plate.
I'm going to do transformation , use DH5α. Transformation of plasmid DNA ligated in 25th (pT7-RBS-Ag43-dT on pSB1K3) in E. coli(DH5α).

1. Added 2ul of plasmid DNA to 50ul of thawed competent cells on ice.
2. Incubated on ice for 30min.
3. Added 200ul of LB then incubated the cells for 2 hours at 37C.
4. Prepared and Labeled two petri dishes with LBK.
5. Plate 200ul of the transformation onto first dish and spread.
6. Added 450ul of LB to 50ul of the transformation and plated 200ul of it onto second dish and spread.
7. Incubated the plates at 37C for 14 hours.

liquid culture

Liquid culture for pT7-RBS-Ag43-dT on pSB1K3.

1. Added 2ml of LBK into culture tubes.
2. Resuspended colonies.
3. Incubated the tubes at 37C for

mini-prep

mini-prep of pT7-RBS-Ag43-dT which had been cultivated from yesterday. We used FastGene Plasmid Mini Kit(Nippon Genetics) and got 50ul of DNA solutions.

mini-prep result

Digestion

pT7-RBS(20ng/ul) =⑨ SpeI 10xH

SpeI 10xM

pT7-RBS(30ng/ul) =⑩

SpeI 10xH

SpeI 10xM

digestion result

We couldn't cut them exactry so we cut once more time.

pT7-RBS(20ng/ul) =⑨ SpeI 10xH

Liquid culture

Liquid culture for pBAD-RBS on pSB1K3.

1. Added 2ml of LBK into culture tube.
2. Scraped the surface of glycerol stock of construct.
3. Incubated the tube at 33C for OOhrs.

Preparing chemical competent cell

Preparing chemical competent cell of BL21, JM109 and DH5α. Chemical competent cell made in each E.coli strains.

Our competent cell Protocol

1. Single colony isolation on LB plate
2. incubated the plate for 15-19 hours at 37℃
3. lift colony of E. coli into 2 ml LB
4. cultured cells at 37℃ for 12-16 hours at 180-200 rpm
5. transfered 30 ul, 100 ul, 300 ul of the culture into 100 ml of LB , respectively
6. cultured cells at 20℃ (for 24 hours over) at 140 rpm
7. selected culture by measuring OD 600
8. left the 300 ml flask for 10 min on ice
9. transfered the culture into two 50 ml Falcon tube
10. centrifuged 3000 rpm at 4℃ for 20 min (TOMY LX-120 rotor), and discard sup
11. suspended the pellet in ice-cold 15 ml of TB (Transformation Buffer)(7.5 ml/tube)
12. collected them in one tube
13. centrifuged 3000 rpm at 4℃ for 20 min (TOMY LX-120 rotor), and discard sup
14. suspended the pellet in ice-cold 3.2 ml of TB
15. Instiled 0.24 ml of DMSO in precipitant
16. left the 50 ml Falcon tube for 10 min on ice
17. divide 50ul of solutions in each 0.5 ml tubes
18. Freezed the suspension in liquid nitrogen
19. stored at –80℃

Electrophoresis

Electrophoresis of digestion result of yesterday(pT7-RBS on pSB1K3 cut with SpeI)

Electrophoresis result

There were low concentration band in above of thin band. This thin band was same as digestion minus band.

Digestion

Digestion of pT7-RBS on pSB1K3(more fresh one)