Team:Bielefeld-Germany/Labjournal

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On this page we summarize the (successful) results and achievements of our teamwork.

Contents

Week 1: 2nd - 8th may

Bisphenol A:

  • cloning of <partinfo>K123000</partinfo> and <partinfo>K123001</partinfo> behind weak (<partinfo>J23103</partinfo>) and medium strong (<partinfo>J23110</partinfo>) constitutive promoter (each part and both parts polycistronic)
  • cloning of fusionprotein between <partinfo>K123000</partinfo> and <partinfo>K123001</partinfo>, also assembly behind weak and medium strong constitutive promoter
  • testing and establishing of HPLC method for [http://en.wikipedia.org/wiki/Bisphenol_A BPA] detection
  • expression of the successfully assembled BPA degrading BioBricks in E. coli [http://openwetware.org/wiki/E._coli_genotypes#TOP10_.28Invitrogen.29 TOP10]

S-layer:

  • successful PCR on the S-layer genes of [http://expasy.org/sprot/hamap/CORGL.html Brevibacterium flavum] and Corynebacterium crenatum
  • successful cloning of the S-layer gene of B. flavum without TAT-sequence

Organizational:

  • meeting with [http://www.bielefeld-marketing.de/de/index.html Bielefeld Marketing] to discuss our participation at the science festival [http://www.geniale-bielefeld.de/ GENIALE] in Bielefeld

Week 2: 9th - 15th may

Figure 1: HPLC results of the first experiment on BPA degradation in E. coli TOP10. Cultivations were carried out in LB medium with 100 mg L-1 BPA at 30 °C. Samples were taken at the beginning of the cultivation and after one day. The HPLC results are shown above (area of the BPA peak). BisdA + BisdB is the polycistronic gene and BisdABisdB is the fusion protein.

Bisphenol A:

  • assembly of <partinfo>K157011</partinfo> behind existing BPA degrading parts (for purification and testing of <partinfo>K123000</partinfo> and <partinfo>K123001</partinfo> in a cell free system)
  • HPLC results: fusionprotein between <partinfo>K123000</partinfo> and <partinfo>K123001</partinfo> can degrade BPA and seems to work better than the polycistronic version (compare fig. 1)

S-layer:

  • expression of the S-layer gene without TAT-sequence of B. flavum in E. coli [http://www.promega.com/products/cloning-and-dna-markers/cloning-tools-and-competent-cells/bacterial-strains-and-competent-cells/single-step-_krx_-competent-cells/ KRX] and [http://openwetware.org/wiki/E._coli_genotypes#BL21.28DE3.29 BL21-Gold(DE3)] after sequencing gave correct results
  • successful PCR on the S-layer gene of [http://ijs.sgmjournals.org/cgi/content/abstract/54/3/779 Corynebacterium halotolerans]

Organizational:

  • moving to our own room in the [http://www.cebitec.uni-bielefeld.de/ CeBiTec]


Week 3: 16th - 22nd may

Bisphenol A:

  • successful PCR on the [http://www.brenda-enzymes.org/php/result_flat.php4?ecno=1.18.1.2 NADP oxidoreductase] gene from E. coli TOP10

S-layer:

  • successful cloning of the complete S-layer gene cspB of B. flavum, C. crenatum and C. halotolerans
  • successful cloning of the S-layer genes of B. flavum and C. halotolerans without TAT-sequence, without lipid anchor and without both (only self-assembly domain)

Organizational:


Week 4: 23rd - 29th may

Bisphenol A:

  • establishing a new method for analysis of BPA concentrations (extraction + LC-ESI-QTOF-MS)

S-layer:


Organizational:

  • arrange a BBQ for our workgroup in the CeBiTec to get to know our coworkers
  • substantiating our contribution to the GENIALE


Week 5: 30th may - 5th june

Bisphenol A:

  • beginning of first characterization experiments for BPA degrading BioBricks (<partinfo>K123000</partinfo> and <partinfo>K123001</partinfo>)

S-layer:


Organizational:

  • meeting with Prof. [http://de.wikipedia.org/wiki/Alfred_Pühler Alfred Pühler] to plan our contribution to the [http://www.cebitec.uni-bielefeld.de/content/view/209/88/ CeBiTec symposium] in july


Week 6: 6th - 12th june

Organizational:

  • presentation of the iGEM competition at the [http://www.bio.nrw.de/studentconvention 2nd BIO.NRW (PhD) Student Convention]


Week 7: 13th - 19th june

Bisphenol A:

  • cloning of NADP oxidoreductase in [http://www.bioinfo.pte.hu/f2/pict_f2/pJETmap.pdf pJET1.2] finally successful -> waiting for sequencing results to remove illegal restriction sites


Week 8: 20th - 26th june

Organizational:

  • finishing our first press release
  • all devices (thermocycler etc.) and materials (competent cells, polymerase, kits) from our sponsors arrived


Week 9: 27th june - 3rd july

S-Layer:

  • our synthesized S-Layers SgsE and SbpA finaly arrived


Week 10: 4th july - 10th july

Bisphenol A:

  • experiments on the influence of temperature, promotor intensity and the characteristics of the fusion protein <partinfo>K123000</partinfo> || <partinfo>K123001</partinfo> on BPA degradation

Organizational:

  • presenting our posters from the teams of 2010 and 2011 at the congress [http://www.biotechnologie2020plus.de/BIO2020/Navigation/DE/root,did=121262.html Biotechnologie2020+] in Berlin hosted by the "Bundesministerium für Bildung und Forschung" (Federal Ministry of Education and Research).

Week 11: 11th july - 17th july

Bisphenol A / S-Layer:

  • our BioBrick order (some fluorescences proteins and cleavage sites) from iGEM HQ arrived

Organizational:

  • presenting the iGEM competition and our team project at the secondary school [http://www.rg-herford.de/ Ravensberger Gynmasium] in Herford ([http://www.flickr.com/photos/igem-bielefeld/sets/72157627214780020/ Photos])


Week 12: 18th july - 24th july

Organizational:

  • presenting our projects from 2010 and 2011 at the [http://www.cebitec.uni-bielefeld.de/content/view/209/88/ CeBiTec Symposium 2011] in Bielefeld
  • meeting and having fun with the iGEM teams from Delft/NL, Edinburgh/UK, Odense/DK. Freiburg/DE and Ljubljana/SL at the Symposium ([http://www.flickr.com/photos/igem-bielefeld/sets/72157627300144576/ Photos])


Bisphenol A / S-Layer:

  • removing illegal restiction sites to get valid BioBricks


Molecular Beacons:

  • cloning the NAD+ dependent ligase from E. coli into BioBrick backbones

Week 13: 25th july - 31th july

S-Layer:

  • fusing the synthesized S-Layers to a bunch of fluorescent proteins

Bisphenol A:

  • testing new BPA extraction protocols for LC-MS including an internal standard (bisphenol F)

Week 14: 1st august - 7th august

Bisphenol A:

  • BPA analysis with extraction and LC-MS finally works and is very accurate
  • Better results for BPA degradation in E. coli -> our fusion protein (<partinfo>K123000</partinfo> to <partinfo>K123001</partinfo>) can completely degrade BPA
  • Measuring characterization results for different BPA degrading BioBricks

Molecular Beacons:

  • Successful characterization of two differently labeled Molecular Beacons as a preparation for the NAD+ bioassay including autonomously produced NAD+ dependent DNA ligase from E. coli


Week 15: 8th august - 14th august

Bisphenol A:

  • BPA analysis with extraction and HPLC with UV detector leads to very similar results as the analysis with LC-MS (except for low BPA concentrations -> LOD / LOQ of LC-MS is lower than that of "normal" HPLC, compare figure 2)
  • measuring of more samples from cultivations with BPA degrading BioBricks for further characterization
  • we discovered some interesting results in our MS data - soon more
  • testing methods to purify his-tagged BisdA and BisdB for cell free BPA degradation and further characterization of these proteins
  • testing the influence of BPA on the growth of E. coli
  • developing a modell for BPA degradation by E. coli (compare fig. 3)
Figure 2: HPLC results and optical density of experiments on BPA degradation of E. coli KRX. Cultivations were carried out in LB medium with ~ 100 mg L-1 BPA at 30 °C. Samples were taken every three hours over one day. BPA concentration was measured by HPLC with either UV detector or ESI-qTOF-MS. 502: negative control (<partinfo>K123000</partinfo>), 512: polycistronic <partinfo>K123001</partinfo> and <partinfo>K123000</partinfo>, 517: fusionprotein between <partinfo>K123001</partinfo> and <partinfo>K123000</partinfo>, every part behind medium strong constitutive promoter.
Figure 3: Modelling of BPA degradation (filled squares) by and OD600 (open squares) of E. coli KRX carrying genes for BisdA and BisdB (polycistronic bisdAB (black) and fusion protein between BisdA and BisdB (red)) behind the medium strong promoter <partinfo>J23110</partinfo>. Cultivations were carried out at 30 °C in LB + Amp + BPA medium for 24 h with automatic sampling every three hours in 300 mL shaking flasks without baffles with silicon plugs. Three biological replicates were analysed.


S-layer:

  • MALDI-TOF analysis of SDS-PAGEs to characterize the function of the TAT-sequence and the lipid anchor of PS2 (encoded by cspB gene) in E. coli


Week 16: 15th august - 21st august

S-layer:

  • finally found our S-layer proteins in E. coli -> now we can plan purification strategy
  • fusion of FPs to sgsE successful

Bisphenol A:

  • all metabolites of natural BPA degradation pathway found during degradation of BPA in E. coli by LC-MS -> now MS/MS to check structure of these metabolites to be sure
  • testing whether E. coli can grow on BPA as the only carbon source (on M9 plates)
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