Team:Bielefeld-Germany/Labjournal/week12

Week 12 (07/16 - 07/22/12)

Monday July 16th

• Team A. thaliana laccase: Our plants had a great time during the last weeks in the climate chamber. So today it was time for them to donate their seeds for RNA isolation, cDNA synthesis and a PCR (check protocols). We ran an additional sample with actin primers as a positive control. However both samples did not show any bands. Maybe the high salt concentration in our sample was responsible or the laccase concentration in the 1:10 diluted cDNA was too low. We will do some washing and try again.

Team Fungal Laccases: We designed new forward primers for the laccases Tv5, Tv10, Tv13, Tv20 and Pc35 with the overhanging end for cloning in our shuttle vector. This time we started the gene sequences after the signal sequences which are in the five laccases.

Tuesday July 17th

• Team Cultivation/Purification: Second cultivation
• Team Site Directed Mutagenesis: Made Clone Manager files for Trametes versicolor sequences

Wednesday July 18th

• Team Site Directed Mutagenesis: Made Primer-Mixes. Got everything ready for Lab work.
• Team Bacterial Laccase: We diluted our chromosomal DNA to a concentration of 20ng/mikroliter, since the volume we got was to low for doing many PCRs and did again a PCR reaction. This time S. goe Laccase DNA could be identified but not S. tue. The reaction conditions were the same so we were suprised because S. tue didn`t work.

Thursday July 19th

• Team Site Directed Mutagenesis: PCR and DpnI-restriktion of the SDM to mutate the B.pumilus-Laccase-Plasmid at 2883, the E.coli-Plasmid at 2307, the X.campestris at 2247 and T.thermophilus-Plasmid at 2796.
  • Generated SDM-Primer for the Trametes versicolor Laccase 10 gene (2 mutations - one illegal restriktion site in the signaling-sequence will not be mutated).
• Team Cellulose Binding Domain: Got info about Carbohydrate binding domain X2 (which is a more common domain in the organisms we handle than a Cellulose Binding Domain.)
  • Nucleotid BLASTed BBa_K392014 (Cellulose-binding motif from C. josui Xyn10A gene) -> 1526bp to 2608bp of AB041993.1 (Clostridium josui xynA gene for xylanase A)
  • Portein-BLASTed AB041993.1 and found got one cellulose binding site and one carbohydrate binding domain.:
    • pfam02018: CBM_4_9 (Carbohydrate binding domain) from AS 193 to AS 332 - corresponds to 1088 - 1507 in Gene and is not in the coding sequence of BBa_K392014
    • cd09619: CBM9_like_4 (DOMON-like type 9 carbohydrate binding module) from AS 716 to AS 887 - corresponds to 2657bp to 3172bp in the gene and is also not in coding sequence of BBa_K392014
    • Given sequence of BBa_K392014 (1589bp to 2590bp) does corresponds to the sequence of the Glycosyl hydrolase 1589bp to 2590bp and not one of the binding motifs
• Team Bacterial Laccase: S. goe and S. tue DNA were cleaned up and we done an enzymatic digestion to ligate it into the pSB1C3 vector. We did the digestion with EcoRI and SpeI.

Friday July 20th

• Team Modeling: We need a contact to a clarification plant to get information about clarification plant itself and perhaps to proof our cleaner with real probes. therefor we are calling Mr. Bülter form the clarification plant Schloß Holte (near Bielefeld) and he invited us to present our projekt.
• Team Site Directed Mutagenesis: Transformation of XL1 Blue with the PCR-products (see day before)
• Team Cellulose Binding Domain: Protein-BLASTed the Proteinsequence of Clostridium cellulovorans cellulose binding protein, Bacillus halodurans strain Cochin chitinase GU481106.1 and chitin-binding protein [Bacillus halodurans C-125] BAB05022.1, to get the predicted sequences of CBDs
  • Looked up possible linkers in the Partsregistry:
    • 2 aa GS linker: BBa_J18920 [GS]
    • 10 aa [GS]x linker: BBa_J18922 [GSGSGSGSGS]
    • 15 aa flexible glycine-serine protein domain linker; Freiburg standard 1 Star: BBa_K157013 [GGGGSGGGGSGGGGS]
    • 10 aa flexible protein domain linker 1 Star: BBa_K105012: [GENLYFQSGG]
  • Made a few possible primers for CBDclos with T7 and RBS (BBa_K525998), a Freiburg-Suffix and possible linkers
  • Wrote an E-Mail to Jun.Prof Thorsten Seidel (FRET-Expert) asking what linkers they use for fusing GFP at FRET.

Saturday July 21st

• Team Cellulose Binding Domain: made primers for GFP (using BBa_I13522 as template)adding a C-termial His6tag for easy extraction
  • Jun.Prof Thorsten Seidel answered the mail and said that GFPs are easy to fuse and that they use linkers with four AS:
    • ccg gtc gcc acc Upstream of the GFP
    • gaa agc ggc cgc downstream of the GFP; Which is said to work fine, even with a prolin in it.
  • I decided to also use four linking AS and choose to add a C-terminal GS-Linker (BBa_J18920) to the CBDclos which would be four linking AS with the Freiburg-scar (TG).

Sunday July 22nd

• Team Cellulose Binding Domain:talked to teammates about the concept and desided to use the exact sequence of BBa_J18920 (GGCAGC)
  • Checked the CBDs we have for illegal restriktion sites - found none, not even NgoMIV or AgeI. So we decided to use a FFreiburg-Assembly to build the CBD-GFP-Fusion-Protein.

55px