From 2012.igem.org

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  • 1. Introduction
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  • 4. Outside Modification
  • 5. Inside Modification
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Last year's project: Synchronized Oscillatory System

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week 21: 17 September - 23 September

Hepatitis B inside modification

• Colony PCR of Hepatitis B core protein behing an IPTG promoter in pSB1C3 backbone with sequencing primers

-> the gel shows fragments of the expected size (about 1kb)

GFP modification

17 September

• ligation of the PCR products from 14 September (mixing the duplo samples together) with pJET and transformation with JM109

19 September

• colony PCR of the transformation from 17 September (with pJET sequencing primers)

Figure 1: Colony PCR 19 September

20 September

• miniprep 2 colonies of the GFP-coil and 2 colonies of the GFP-coil with a His tag transformants from the Colony PCR

• Digestion check of these minipreps

-> shows the expected fragment sizes for all the samples

• sent 1 sample of the GFP-coil and 1 sample of the GFP-coil with the His tag for sequencing

• Digestion of both GFP-coil construct, pSB1C3 and Bba_J04500

-> the backbone yields after purification where too low. A new culture was grown to obtain new minipreps of the backbones.

21 September

• Digestion and ligation of both GFP-coil constructs into pSB1C3 and Bba_J04500

• Transformation with JM109

22 September

• Colony PCR of the transformations from 21 September

-> all samples showed the expected fragment sizes

Figure 2: Colony PCR 22nd september GFP E-coil

23 September

-> despite the positive result the day before, a lot of colonies on the plates containing the GFP-constructs ligated with pSB1C3 turned red. Since we used BBa_J04450 (containing RFP framed by pre- and suffix) to obtain the backbone this means that the transformation was only succesfull with a few colonies and the Colony PCR from 22 September might be faulty

• The colony PCR from 22 September was repeated

<p align="justify">Figure 3: Colony PCR 22 September; GFPcoil constructs in Bba_J04500 using forward primer annealing to the coil and sequencing backward primer

Figure 4: Colony PCR 22 September; GFPcoil constructs in pSB1C3 using sequencing primer

-> The GFP-coil with the His tag in pSB1C3 samples showed 2 positive results. The other construct in this backbone showed a very vague fragment at the expected size -> Some samples of colonies containing GFP-coil constructs in Bba_J04500 showed frament sizes of the expected size (arrows)

• two of each sample in each backbone where grown and miniprepped

CCMV coil addition

Frame shift in coil addition After receiving our samples from the sequencing, we saw that there was a frame shift in the sequence, leading to the faulty translation of the CCMV delta 25 coat protein, with an early stop codon.

The new primer is ordered to still make this part available for the registry, but submission before the wiki deadline will not be possible anymore. however, we think that iGEM should not be the only reason to deliver bricks, and we intend to deliver all bricks that did not make it just in time, still after the iGEM deadlines.

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