Team:Todai-Tokyo/Notebook/isoleucine

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Contents

Plan

Aim: Create bacteria that produce a noxious odour when induced to do so

Methods:

  1. Clone the yqiT gene from Bacillus subilitis into a biobrick vector.
  2. Make constructs that express this gene constitutively and under the control of an inducible promoter.

6/5

Constructs to be created:

  1. yqiT
  2. ptetR-RBS-yqiT-dterm
  3. pAraC-RBS-yqiT-dterm
  4. pLacI-RBS-yqiT-dterm

Obtaining DNA:

Resuspended DNA in the following wells with 10ul water:

Plate 1 1D
[http://partsregistry.org/wiki/index.php/Part:BBa_R0080 AraC regulated promoter]

Plate 1 12E
[http://partsregistry.org/wiki/index.php?title=Part:BBa_R0010 LacI regulated promoter]

Plate 1 1H
[http://partsregistry.org/wiki/index.php/Part:BBa_B0030 Strong RBS]

Plate 1 13B
[http://partsregistry.org/wiki/index.php?title=Part:BBa_J13002 TetR repressed POPS generator]

Plate 2 24C
[http://partsregistry.org/wiki/index.php?title=Part:BBa_B0014 Double terminator]

Transformed 1ul of each of the above into DH5a competent cells:

Transformation

  • Mix 1ul of DNA with 100ul of competent cells on ice.
  • Leave on ice for 30 minutes.
  • Heat shock at 42℃ for 45 seconds.
  • Leave on ice for 2 minutes.
  • Add 500ul of LB and incubate at 37℃ for 1 hour.
  • Plate on LB-ampicillin plates.


6/6

No colonies grew from the 5 transformations of 6/5.


6/7

Creating a biobrick part out of yqiT

Strategy: PCR out the yqiT gene from the Bacillus subilitis genome using primers to attach the biobrick preffix/suffix and clone this into a biobrick vector. The vector utilized is the GFP generator which houses a sufficient-sized insert:


Plate 1 16E (from 2007 iGEM distribution provided by Chiba University)
[http://partsregistry.org/wiki/index.php?title=Part:BBa_E0840 GFP generator]

PCR of yqiT gene
The Bacillus subilitis genome was provided by <?????????>


The following primers were used to amplify an approx. 1500bp fragment from the Bacillus subilitis genome.

yqiT EX: <????????>


yqiT SP: <????????>

PCR protocol
The following was mixed in a PCR tube:
1ul 20uM yqiT EX primer
1ul 20uM yqiT SP primer
2ul 10X <????> buffer
<???> dNTP mix
0.15ul Bacillus subilitis genome
<???> <????> enzyme
<???> MilliQ

Performed PCR using the following program:

1. 95℃ 2 minutes
2. 95℃ 1 minute
3. 50℃ 30 seconds
4. 72℃ 1 minute 20 seconds
5. Repeat 2-4 29 times
6. 4℃ ∞

Purified PCR product using the Promega PCR purification kit.

Ran on gel to visualize bands:


Digestion
Digested purified PCR product and the GFP generator both with XbaI/PstI:

yqiT
3ul PCR product
1ul High buffer
0.5ul XbaI
0.5ul PstI
5ul MilliQ

GFP generator
6ul DNA
2ul High buffer
0.5ul XbaI
0.5ul PstI
11ul MilliQ

Incubated mixtures at 37℃ for 1 hour.

Ran on gel to gel purify:

090607.2.jpg