Team:UT-Tokyo/Data/Method

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Method

Dual luciferase assay

Cell diffsion assay

Preparation

0.25% agar LB plate (0, 1, 10, 40 or 100uM IPTG)

Protocol

  1. Pick single colony(cheZ- or cheZres) using a pipetman with sterile tip.
  2. Inoculate tip with colony into 0.25% agar plates.
  3. Incubate at room temperature (25°C).
  4. Exposure the plates every 24 hours.

Notes

0.25% agar plate is fragile. You should keep it horizontal.

L-aspartate chemotaxis assay

Preparation

0.25% agar LB plate
10mM L-Asp solution

Protocol

  1. Pick JM109 single colony using a pipetman with sterile tip.
  2. Inoculate tip with the colony into the point that is 25mm distant from the center of 0.25% agar LB plate.
  3. Incubate at room temperature (25°C) for 45 hours.
  4. Trickle 40µL of 10mM L-Asp solution in its center(Asp+) or 40µL of MilliQ(Asp-).
  5. Exposure the plates after inoculating at room temperature for more 20 hours.

Notes

0.25% agar plate is fragile. You should keep it horizontal.


Assembly parts

Digest

Ligation

colony PCR

Transformation

Making Competent E. coli cell

Transformation of E. coli

Preparation

iGEM parts / ligation products
SOC or LB (No antibiotic) 500μL
TE 15μL
plates
ice box
heat block(42°C)
competent cells

→ always on ice! Melt on ice! Mix DNA as soon as cells melt!

Protocol

to thaw out igem parts

  1. With a pipette tip, punch a hole in the foil
  2. Add 15uL of TE (MilliQ),and pipetting
  3. Pipette 1uL of the resuspended DNA Transformation into your desired competent cells
  4. Hold on ice for 30 mins
  5. Heat shock at 42°C for 45 seconds (and on ice after it)
  6. Add 300uL of LBborth in each epp
  7. Wait for 10 mins
  8. Hold at 37℃ for 30 mins
    (this step can be skipped with ampicillin selection)
  9. Plate out
  10. Incubate at 37°C

Purification of DNA

Miniprep

Preparation

kit of Promega (SVMinipreps)
incubative tube
1.5ml epp tube
MilliQ

Procedure

  1. pour contents out of the incubative tube into the 1.5ml tube as you can
  2. centrifuge for 10min (15,000rpm)
    (you can centrifuge incubative tube directly when it can endure up to 6,000g )
  3. throw supernatant fluid away not to damage the precipitation
    ( you should decant by using yellow tip first / remove culture medium as you can / throw waste water away in bio hazard!)
  4. add 250μl cell resuspension solution (red label)、suspend completely
    (incomplete suspending decreases yields / you should use epp stand like a washboard)
  5. add 250μl Cell lysis solution(green label
  6. turn the tube upside down four times slowly not to bubble
  7. add 10μl Alkalin Protease Sol. (small bottle)
  8. turn the tube upside down four times slowly not to bubble
  9. wait for 5min (Be careful not to exceed 5min! colon bacillus will disintegrate too much!)
  10. add 350μl Neutralization Sol. (blue label
  11. turn the tube upside down four times slowly not to bubble
  12. centrifuge for 10min (15,000rpm)
  13. put the supernatant fluid to column (germ’s wreckage is adhering below)
  14. centrifuge for 1min (15,000rpm)
  15. throw flow through (the liquid in the tube below) away
  16. add 750μl Wash Sol. to column and centrifuge for 1min (15,000rpm)
  17. throw flow through away, put 250μl Wash Sol. to column and centrifuge for 1min (15,000rpm)
  18. change the column into 1.5ml tube and centrifuge for 2min (15,000rpm)
  19. change the tube into new one and add 50μl MilliQ
    (use Nucleas-Free Water in the kit instead of MilliQ)
  20. centrifuge for 1min (15,000rpm) after waiting for 1min
  21. take 1 to 1.5μl and determine the concentration by NanoDrop (Don’t dilute)
  22. label them

Gel extraction, PCR clean-up

Preparation

Kit of promega
Gel

Procedure

  1. Gel Slice and PCR Product Preparation
    Dissolving the Gel Slice
    1. Cut out gel with wanted band and put it in a tube.
    2. Add 3 parts Mem. binding sol. to 1 part Gel volume.
    Processing PCR Amplifications
    1. Add an equal volume of Membrane Binding Solution to the PCR amplification.
  2. Shake & Incubate at 50-65 degrees C until gel is completly dissolved.
  3. Put in the column.
  4. Centrifuge at 15,000 rpm for 1 minute
  5. Empty collection tube and add 700 ul Mem. Wash sol, centrifuge for 1 minute.
  6. Empty collection tube and add 500 ul Mem. Wash sol, centrifuge for 1 minute.
  7. Change the column to a new 1.5 ml Eppendorf and centrifuge at 15,000 rpm for 1 minute.
  8. Change the old tube to a new 1.5 ml Eppendorf, add 30ul Nuclease-Free Water, incubate at RT for 1 minutes, then centrifuge at 15,000 rpm for 1 minute.
  9. Measure concentration, label the Eppendorf.

Notes

Percent Recovery Versus Double-Stranded DNA Fragment Size
DNA Fragment Size Percent Recovery
55bp 26%
100bp 84%
1,000bp 92%
23,130bp 47%


Ethanol precipitation for Parts shipping

Preparation

100%, 70% Ethanol
TE buffer
Miniprep products

Procedure

  1. Add 2 volumes ice cold absolute ethanol to sample.
  2. Incubate 1 hr at -80°C.
(The long incubation time is critical for small fragments)
  1. Centrifuge for 30 minutes at 0°C at maximum speed (generally >10000 g at least).
  2. Remove supernatant.
  3. Wash with 750-1000 ul room-temperature 95% ethanol.
  4. Centrifuge for 10 minutes at 4°C at maximum speed (generally >10000 g at least).
  5. Dry the pellet. For this you can air dry (tubes open, ~15 min).
    (Overdrying can make DNA hard to re-dissolve)
  6. Add 10 ul TE buffer. Vortex and spin down to resuspend.
  7. Determine the concentration by NanoDrop.

Notes

Pellets can be very small and hard to see. Make sure that you don't break invisible pellets on all steps.

Analysis of DNA

Gel electrophoresis

Sequencing

Reagents

SOB broth

reagents final conc. amount
Bacto trypton 2% 20g
NaCl 0.05% 0.5g
Yeast extracs 0.5% 5g
KCl (250mM) 2.5mM 10ml
MilliQ - 1000ml
Total 1L

Before use, add 10ml Mg sol.

Mg sol.
reagents final conc. amount
MgCl2(H2O)6 1M 20.33g
MgSO4(H2O)7 1M 24.648g
MilliQ - 100ml
Total 100ml


20× M9 medium

reagents final conc. amount
Na2HPO4 - 6.0g
KH2PO4 - 3.0g
NaCL - 0.5g
NH4Cl - 1.0g
MilliQ - 50ml
Total 50ml

After A.C. , add following reagents to 1L M9 medium

reagents final conc. amount
1M MgSO4 - 1.0ml
2M Glucose - 5.6ml
1% Thiamine - 1.0ml
1M CaCl2 - 0.1ml

LB broth

reagents final conc. amount
Bacto trypton 1% 1g
NaCl 0.5% 0.5g
Yeast extracs 0.5% 0.5g
MilliQ - 100ml
Total 100ml


50× TAE

reagents final conc. amount
Tris 2M 242g
CH3COOH 1M 57.1mL
EDTA (0.5M, pH=8.0) 0.05M 100ml
MilliQ - 1000ml
Total 1L



TB

reagents final conc. amount
KOH 500mM sol. 250mM 242g
PIPES 500mM sol. 10mM 2ml
CaCl2 750mM sol. 15mM 2ml
KCl 2.5M sol. 250mM 10ml
MnCl2 550mM sol. 55mM 10ml
MilliQ - 100ml
Total 100ml


Strains

JM109 (Takara Bio INC.)

  • Genotype:
recA1, endA1, gyrA96, thi-1, hsdR17(rK-mk+), e14–(mcrA–), supE44, relA1, Δ(lac-proAB)/F' [traD36, proAB+, lac Iq, lacZΔM15]

BL21(DE3)

  • Genotype:
F- ompT hsdSB (rB-mB-) gal dcm (DE3)

ccdB survival (invitrogen)

  • Genotype:
F- mcrA Δ(mrr-hsdRMS-mcrBC) Φ80lacZΔM15 ΔlacX74 recA1 araΔ139 Δ(ara-leu)7697 galU galK rpsL (StrR) endA1 nupG fhuA::IS2

JW 1970 (cheZ-)

derived from K12 BW25113

  • Genotype
(araD-araB)567, lacZ4787(::rrnB-3), lambda-, rph-1, (rhaD-rhaB)568, hsdR514
details available at http://ecoli.aist-nara.ac.jp/GB6/info.jsp?id=JW1870

DH5α (invitrogen)

  • Genotype:
F- φ80lacZΔM15 Δ(lacZYA-argF)U169 recA1 endA1 hsdR17(rk-, mk+) phoA supE44 λ-thi-1 gyrA96 relA1 tonA

CJ236 (Takara Bio INC.)

  • Genotype:
dut1, ung1, thi-1, relA1/pCJ105(F' camr)