Paris/July 15

From 2007.igem.org

(Difference between revisions)
(Growth kinetics of w121 strain)
(Growth kinetics of w121 strain)
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We make an array to test growth of w121 on different growth media (LB, S0.2, S0.4, S0.6, S0.8), supplemented with different amount of DAP.
We make an array to test growth of w121 on different growth media (LB, S0.2, S0.4, S0.6, S0.8), supplemented with different amount of DAP.
-
Two questions are addressed by the following assay:
+
Two questions are addressed by the following assay: br>
1) What is the growth behaviour of w121 (dapA- strain) at different concentrations of DAP? <br>
1) What is the growth behaviour of w121 (dapA- strain) at different concentrations of DAP? <br>
2) How does w121 strain grow on filtrates of MG1655 growth medium; that is, does MG1655 secrete DAP during growth? <br>
2) How does w121 strain grow on filtrates of MG1655 growth medium; that is, does MG1655 secrete DAP during growth? <br>

Revision as of 12:01, 31 August 2007

  • Minipreps on the following ON cultures:
    • clones 1 & 2 of DH5alpha transformed with biobrick pJ23100
    • clones 1 & 2 of ... BB B0015


  • Isolation of 10 colonies of the following transformants:
    • BBa_pJ23107 (ON culture on LB Amp is launched for clones 1 & 2)
    • BBa_I0500 (ON cultures on LB-Kan clones 1 & 2)


Growth kinetics of w121 strain

We make an array to test growth of w121 on different growth media (LB, S0.2, S0.4, S0.6, S0.8), supplemented with different amount of DAP.

Two questions are addressed by the following assay: br> 1) What is the growth behaviour of w121 (dapA- strain) at different concentrations of DAP?
2) How does w121 strain grow on filtrates of MG1655 growth medium; that is, does MG1655 secrete DAP during growth?

MG1655 was grown on LB medium and the growth medium was filtered free of bacteria at different DO (Optical Densities) during exponential growth phase:

S0.2 (at DO=0.2) S0.4 (at DO=0.4) S0.6 S0.8


W121 was grown on different media & Growth kinetics were measured:


LB line B in the array S0.2 (at DO=0.2) line C in the array S0.4 line D in the array S0.6 line E & F in the array S0.8 line G in the array

In the different columns, DAP was added to the indicated final concentrations (without taking into account DAP produced by MG1655 regarding the recycled growth media)


Kinetic Array :w121 kinetic as a function of DAP and supplemented medium (S0.x)
1 2 3 4 5 6 7 8 9 10 11 12
A H20 H20 H20 H20 H20 H20 H20 H20 H20 H20 H20 H20
B H20 LB+0µM DAP LB+20µM DAP LB+25µM DAP LB+30µM DAP LB+35µM DAP LB+40µM DAP LB+45µM DAP LB+50µM DAP LB+55µM DAP LB+60µM DAP H20
C H20 S0.2+0µM DAP S0.2+5µM DAP S0.2+10µM DAP S0.2+15µM DAP S0.2+20µM DAP S0.2+25µM DAP S0.2+30µM DAP S0.2+35µM DAP S0.2+40µM DAP S0.2+45µM DAP H20
D H20 S0.4+0µM DAP S0.4+5µM DAP S0.4+10µM DAP S0.4+15µM DAP S0.4+20µM DAP S0.4+25µM DAP S0.4+30µM DAP S0.4+35µM DAP S0.4+40µM DAP S0.4+45µM DAP H20
E H20 S0.6+0µM DAP S0.6+2µM DAP S0.6+5µM DAP S0.6+8µM DAP S0.6+11µM DAP S0.6+14µM DAP S0.6+17µM DAP S0.6+20µM DAP S0.6+23µM DAP S0.6+26µM DAP H20
F H20 S0.6+0µM DAP S0.6+2µM DAP S0.6+5µM DAP S0.6+8µM DAP S0.6+11µM DAP S0.6+14µM DAP S0.6+17µM DAP S0.6+20µM DAP S0.6+23µM DAP S0.6+26µM DAP H20
G H20 S0.8+0µM DAP S0.8+2µM DAP S0.8+5µM DAP S0.8+8µM DAP S0.8+11µM DAP S0.8+14µM DAP S0.8+17µM DAP S0.8+20µM DAP S0.8+23µM DAP S0.8+26µM DAP H20
H H20 H20 H20 H20 H20 H20 H20 H20 H20 H20 H20 H20

See results.

The 96 well plate is surrounded by H2O in order to maintain humidity during the assay. In each slot, 200µL of the growth medium (LB or S0.x) is mixed with 2µL of w121 culture grown ON, and with different amount of DAP (see table). The growth profile is measured over a period of 30H, a DO measurement is acquired each 6min10s.

Gel extraction of PCR products

  • PCR products of 13/07/07 & 14/07/07

migration on 1% Agarose gel extraction of bands of interesst with gel extraction Wizard kit according to the manufacturer's instructions