Team:Peking/Notebook/YSheng

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Contents

• July, 2010

• August, 2010

• September, 2010

• October, 2010

July

[TOP]

7.2 – 7.4

RBS(B0034)- merR construction

Vector Digestion:

B0034 plamid 5μL

SpeI(NEB) 1.5μL

PstI(NEB) 1.5μL

Buffer 2μL

ddH2O 10μL

Gel extraction the digested product

Ligation:

RBS-merR(digested by EcoRI & PstI) 3 μL (prepared by Ao Liu) BBa_ B0034 (s.p. digested) 1 μL ddH2O 4 μL buffer 1 μL ligase 1 μL Transformed all the 10μL to trans 5a competent cell.

Colony Picking-up & PCR certification Taq Mix 5 μL Univ-For 0.5 μL Univ-Rev 0.5 μL ddH2O 4 μL miniprep 3 right clones and sequence them.

PmerT – GFP (E0840) construction The PmerT insert preparation: Two reverse and complementary strains of PmerT were synthesized with artificial sticky ends if they were annealed.

Vector Digestion: E0840 plamid 5 μL EcoR I(NEB) 1.5 μL XbaI(NEB) 1.5 μL EcoRI Buffer 2 μL ddH2O 10 μL Gel extraction the digested product

Annealing: 95℃ 5min, cooled done in metal bath. PmerT-For 5μL PmerT-Rev 5μL Phosphalation: 37℃ for 30min T4 PNK 1μL T4 ligase buffer 1μL ddH2O 4μL Annealing product 3μL

Ligation PmerT Phosphalation product 9μL Ligase 1μL E0840 vector (E. X. digested) 1μL Transformed all the 11μL to trans 5a competent cell.

Colony Picking-up & PCR certification Taq Mix 5 μL PmerT-For 0.5 μL E0840-Rev 0.5 μL ddH2O 4 μL miniprep 3 right clones and sequence them.

7.5-7.11

Pc(J23100) – RBS- merR construction Vector Digestion: J23100 vector digested by S.P. RBS-merR digested by X.P. Gel extraction of vector and insert

Ligation Transformed all the 10μL to trans 5a competent cell.

Colony Picking-up & PCR certification Primer: Univ-For & Univ-Rev miniprep 3 right clones and sequence them.

Changed the backbone of PmerT-GFP from pSB1A2 to pSB3K3 Vector Digestion: pSB3K3 vector digested by S.P. RBS-merR insert digested by X.P. Gel extraction of vector and insert

Ligation 6 μL insert + 2 μL vector Transformed all the 10μL to trans 5a competent cell.

Colony Picking-up & PCR certification Primer: PmerT-For & Univ-Rev miniprep 3 right clones

7.12-7.18

Reconstruct Pc(J23100) – RBS- merR construction since the sequence results were wrong.

Made competent bacteria containing the PmerT-GFP(pSB3K3) Cultured the bacteria in LB overnight Dilute the bacteria 1:100 with LB and culture it until OD reached 0.4-0.6 Centrifuge 500μL bacteria 5000rpm for 5min Resuspended the cell with 500μL chilled 0.1M CaCl2, incubated in ice for 30min Centrifuge 500μL bacteria 5000rpm for 5min Resuspended the cell with 100μL chilled 0.1M CaCl2

Constructed strains with both PmerT-GFP(pSB3K3) and Pc(1-18I)-RBS-MerR(pSB1A2) Transformation the competent bacteria of PmerT-GFP(pSB3K3) with 2μL Pc(1-18I)-RBS-MerR(pSB1A2) plasmid.

7.19-7.25

Inducement of the strain with two plasmids which were constructed last week 7.20 With Hg(II)’s concentration = 1E-6 mol/L, 1E-7 mol/L and 1E-8 mol/L to certify that the strain worked. 7.22 With Hg(II)’s concentration = 1E-10, 1E-9, 1E-8, 2E-8, 4E-8, 6E-8, 8E-8, 1E-7, 1E-6, 1E-5(mol/L) 3 duplicates GFP’s intensity was measured by microplate reader. 7.23 With Hg(II)’s concentration = 1E-10, 1E-9, 1E-8, 4E-8, 7E-8, 1E-7, 4E-7, 7E-7, 1E-6, 1E-5(mol/L) 3 duplicates 7.24 With Hg(II)’s concentration = 1E-10, 1E-9, 1E-8, 4E-8, 7E-8, 1E-7, 4E-7, 7E-7, 1E-6, 1E-5(mol/L The OD was measured by Spectrophotometer to conform Hg(II)’s effect on bacterial growth

7.25 With Hg(II)’s concentration = 1E-10, 1E-9, 4E-9, 1E-8, 1.5E-8, 2E-8, 3E-8, 4E-8, 7E-8, 1E-7, 1.5E-7, 2E-7, 3E-7, 4E-7, 7E-7, 1E-6, 4E-6, 1E-5(mol/L) OD600 of each sample was also measured by Spectrophotometer.

7.26-8.2

Measurement of the 3 – dimensional figure which represented the time and dose response curve to mercury both for OD600 and GFP intensity.

I first tried to sample 100μL every 20min to the black-96-well plate and stored the plate in 4℃，OD was measured by spectrophotometer right after sampling.

The optimized protocol was to incubate the bacteria with Hg(II) in the microplate (black one for GFP intensity measurement and transparent one for OD600 measurement), then the two plates were measured by the microplate reader every 20min. During the interval of measurement, the two plates were cultured in the 37℃ shaker.

August

[TOP]

7.26-8.2

Measurement of the 3 – dimensional figure which represented the time and dose response curve to mercury both for OD600 and GFP intensity.

I first tried to sample 100μL every 20min to the black-96-well plate and stored the plate in 4℃，OD was measured by spectrophotometer right after sampling.

The optimized protocol was to incubate the bacteria with Hg(II) in the microplate (black one for GFP intensity measurement and transparent one for OD600 measurement), then the two plates were measured by the microplate reader every 20min. During the interval of measurement, the two plates were cultured in the 37℃ shaker.

8. 3- 8.11

In Shanghai for the EXPO!

8.12-8.23

Induced the strain containing (PmerT-GFP+ Pc(1-18I) –RBS-merR) with Pb(II) to certify its specificity.

Construction of pPbrA-GFP(E0840) by the same stratagy used in the construction of PmerT-GFP(E0840).

Changed the backbone of pPbrA-GFP from pSB1A2 to pSB3K3

8.24-8.29

Re-changed the backbone of pPbrA-GFP from pSB1A2 to pSB3K3

Since the the concentration of low replicates pSB3K3(E. P. digested) was too low, the transformation was failed last week, I minipreped this plasmid again and by several tricks such as repeat elution for several times, the concentration finally reached the requirement for ligation.

8.30-9.5

Insert the two promoters - PmerT and pPbrA - before CrtEBI.

SDS-PAGE to certify the expression of the T3 polymerase