Team:Freiburg Bioware/NoteBook/Labjournal/May

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Revision as of 07:18, 3 January 2011

=> Back to Notebook overview

Contents

6. Labday 03.05.2010

Theoretical cloning

Investigators: Adrian, Hanna, Bea, Patrick, Chris W.


Several theoretical cloning issues need to be adressed: The modularization and modification of the Stratagene plasmids and the prodrug activating enzymes. :

1. Cap-Gen:

  • delete the PstI-restriction site
  • insert an antibody fragment (targeting): sequence? in which part of VP1? (Patrick)
  • add prefix & suffix
  • disable binding of Heparan Sulphat Proteoglycan


2. Rep-Gen:

  • delete EcoRI (2x) and PstI (2x)


3. ITRs:

  • NotI and PstI (in sequence?) flank the ITRs: The question whether they can/have to be deleted arose.
  • where exactly does the sequence start and end? (Patrick)
  • we should check if three ITRs could be used to increase expression levels
  • we blasted the ITR (left) of the MCS vektor (Stratagene). we got a 92% "Coverage" with the AAV2 genom (to 100%). from the alignment (Stratagene ITR with ITR of the AAV2 genom) we got:
Freiburg10 ITR(left)-Stratagene vs. ITR AAV2.jpg


You can see, that the ITR sequence begins 4 bp after the PstI restriction site. thereupon we did a secundary structure analyse (www.dinamelt.bioinfo.rpi.edu), with the following structure we got:
Media:Freiburg10_AAV2ITR(left)nachBlast.pdf
conclusion: the big loop of the secondary structure dosent change if we delete the PstI restriction site (cf. with other uploadet secondary structures), it should be considered that we can't add random bp that could affect the secundary structure.
To do: which bp, which sequence could/can be insertet? cf. the genome of AAV2

4. MCS:

  • replacement through the iGEM-MCS
  • where is the beginning and ending of the MCS in the Vector? ß-globin function and sequence (search for literature and patents, which are denoted in the AAV-Helper-Free-System Manual)
  • in this context it would be also important to find out where the beta-Globulin-Intron exactly starts or rather we can cut out the MCS.


5. enzymes:

  • Thymidinkinase: find informations. TK30 (Bea), SR39 (Hanna)
  • Cytosindeaminase: find informations (Adrian)


in addition we downloaded, added and anotated the sequence of the pHelper plasmid of Stratagene in Geneious (see "Constructs").


insert the antibody fragment (targeting): sequence? in which part of VP1? (Patrick)

7. Labday 07.05.2010

Protocolls

Investigators: Anissa, Kerstin


  • adaption and extension of the standart prorcolls (Cloning for Pro's)
  • we startet to create a protokoll-mask for the praktical-cloning (short version for labwork)

8. Labday 10.05.2010

Stock solutions

Investigators: Adrian, Chris W., Chris L., Bea, Achim, Patrick, Hanna, (Sven)


The following stock solutions were prepared:
1. Antibiotics:

  • Ampicillin: 2 g Ampicillin were dissolved in 20 mL ethanol (70%), filled into 2 mL tubes and stored at -20°C.
  • Chloramphenicol: 0.5 g Chloramphenicol were dissolved in 20 mL ethanol (70%), filled into 2 mL tubes and stored at the -20°C.
  • Kanamycin: 1 g Kanamycin was dissolved in 20 mL multipore-H2O, sterilized by filtration and filled into 2 mL tubes and stored at the -20°C.
  • Tetracyclin: 0.5 g Tetracyclin were dissolved in 20 mL ethanol (70%) and filled into 2 mL tubes. The tubes were wrapped with aluminium foil (light sensitive!) and stored at -20°C.

2. ITPG solution (1 M):

  • ~ 4.766 g ITPG were dissolved in 20 mL multipore-H2O, sterilized by filtration, filled in 2 mL tubes and stored at -20°C.

3. DYT (5 litres)

  • 80 g Bactotrypton, 50 g Bactoyeast, 25 g NaCl were weight out.
  • 2 L multipore-H2O were added
  • after mixing, multipore-H2O was added -> endvolume 5 litres
  • medium was filled into flask and was autoclaved

4. Glycerol:

  • Glycerol was filled into a flask and was then autoclaved

To do: register at Mr. Gene!!!

9. Labday 17.05.2010

β-Globin

Investigators: Bea, Chris W., Patrick, Hanna (and instructors)



We blasted the sequence of the β-globin and additional nucleotides „in the pre- and suffix“. We found only 70% coverage with the human β-globin-intron add. some parts of the exon 3. For this reason we think that the pAAV_MCS annotation of the β-Globin-intron of Stratagene is too generously.
In addition the alignment of the human ß-globin showed that only parts of the intron 2 (5’) and exon 3 are integratet into the vector. We assume that the informations from Stratagene are not total correctly ( intron flanket by the splicedonors and the acceptor-sequence). We blasted the sequence between the CMV-promoter and the origin beginning of the ß-globin intron. We found a 98,8% coverage with a synthetic CMV-promoter construct ( 1 nucleotide difference). Literature: „Diverse plasmid DNA vectors by directed molecular evolution of cytomegalovirus promoters. (Wright A. et al.)“
→The question arises if we can omit the ß-globin (because the exact function is unknown). For this we should contact various Companys (GeneArt, DNA2.0, Mr. Gene,…) to get more information. In addition we could test the expression with and without ß-globin.


10. Labortag 18.05.2010

pCMV_mVenus_YFP

Investigator: Bea, Chris W., Patrick, Hanna, Anissa, Kerstin, Adrian (und Instructors)


Theoretical cloning with Geneious of pCMV-MCS + pGA14_mVenus_YFP --> pCMV_mVenus_YFP

  • Enzyme set: RFC 25 (iGEM)
  • digest pGA14_mVenus_YFP (insert) with XbaI and PstI: mVenus_YFP_cut_XbaI+PstI
  • digest pCMV_MCS (vector) with XbaI and PstI: pCMV_MCS_cut_XbaI+PstI
  • ligate mVenus_YFP_cut_XbaI+PstI with pCMV_MCS_cut_XbaI+PstI
    Freiburg10 pCMV MCS mVenus YFP.png

11. Labortag 19.05.2010

Cloning of pCMV-MCS + pGA14_mVenus_YFP pCMV_mVenus_YFP

Investigators: Adrian, Bea, Chris W., Hanna, Patrick

Digestion

  • plasmid: insert: pGA14_mVenus_YFP; number: P1 production date: ____ origin: ____
  • plasmid: vector: pCMV_MCS; number: P2 production date: ____ origin: ____
  • new vector name: pCMV_mVenus_YFP
  • buffer used:3 ; Restriction-enzymes used: Enzyme XbaI (no. Lab:___) ; Enzyme PstI(no.Lab:___)
  • DNA concentration (vector): 375 ng/µl ; DNA concentration (insert): 476 ng/µl
  • components V (pGA_mVenus_YFP)/ µl V(pCMV_MCS) / µl
    DNA 42,7
    BSA (10x) 22
    Buffer 3 (10x)22
    Enzyme: XbaI (no.Lab:___)1,51,5
    Enzyme: PstI (no.Lab:___)11
    H2O9,510,8
    Total volume2020
  • Incubation: 1 h at 37°C

1% Agarose gel and Gel extraction

  • prepare 1% agarose gel, run gel for 45 minutes(119 V)
  • cut out insert and vector
  • perform gel extraction following standard protocol provided by Qiagen

Ligation

  • Measure DNA-concentration with Nanodrop
  • c(mVenus_YFP) = 16,8 ng/µL
  • c(pCMV_MCS) = 22,8 ng/µL
  • Calculation of volume needed for ligation:
  • c(mVenus_YFP) = 3,66 µL
  • c(pCMV_MCS) = 5,34 µL

Transformation

12. Labortag 20.05.2010

Picking clones

Investigators: Adrian, Bea


    Clones were picked according to the standard protocol.
    • 3 approaches from each plate

13. Labortag 21.05.2010

CMV-Promoter

Investigators: Volker, Hanna


Theoretical cloning:

  • The CMV promoter (mainly the regulatory region) was further characterized: For this purpose U.S. patent no. 5,385,839 was used. Media:Freiburg10_Patent_US5385839A.pdf
  • Further on the CMV promoter sequence was blasted. The results delivered a 98% query coverage with the "Human herpesvirus 5 strain Toledo, complete genome" (accession no.: GU937742.1). Interestingly the maximal identity was just 99%. This can be explained due to a nucleotide deletion and a C-T transition (red circles), which were also marked in Geneious.
Freiburg10 CMV-Alignment.jpg


Freiburg10 CMV.jpg


To do: find "+1"-location (transcription start); which transcription factors bind to the regulatory region of the CMV promoter?

LB medium was prepared

Patrick and Chris W.

  • 10 g Bacto-Tryptone, 5 g Bacto-Yeast, 10 g NaCl were mixed in 500 mL milipore-H2O.
  • Volume was adjusted to 1 L with milipore-H2O.
  • 100 mL flasks were each filled with 50 mL medium.
  • 0.75 g agar was added to each flask.
  • LB was sterilized by autoclaving and is now stored at room temperature.



Plasmid Mini-Prep according to the standard protocol

Adrian, Kira, Anna, Chris W., Patrick
Measure DNA-concentration with Nanodrop:


P3 (pCMV_mVenus_YFP) P4 (pCMV_mVenus_YFP) P5 (pCMV_mVenus_YFP)
concentration (ng/µl) 457470,8 477,29


14. Labortag 25.05.2010

Cloning of pCMV_mVenus_YFP + pAAV_MCS

Investigators: Kira, Anna, Volker, Jessica


  • plasmid: insert: pCMV_mVenus_YFP; number: P5 production date: 21.05.2010 origin: ____
  • plasmid: vector: pAAV_MCS; number: P? production date: ____ origin: ____
  • new vector name: pAAV_mVenus_YFP

    1st try:
  • buffer used:3 ; Restriction-enzymes used: Enzyme NotI (no. Lab:46)
  • DNA concentration (vector): 360 ng/µl ; DNA concentration (insert): 477 ng/µl
    components V (pCMV_mVenus_YFP)/ µl V(pAAV_MCS) / µl
    DNA 4.23.5
    BSA (10x) 33
    Buffer 3 (10x)33
    Enzyme: NotI (no.Lab:46)11
    H2O15.315.3
    Total volume26.425.8
  • Incubation: 1 1/2 h at 37°C
    note: too little water was added

    1% Agarose gel
  • 1% agarose gel was prepared, gel ran for 45 minutes(119 V)

    2nd try:
  • buffer used:4 ; Restriction-enzymes used: Enzyme NotI (no. Lab:159)
  • DNA concentration (vector): 360 ng/µl ; DNA concentration (insert): 477 ng/µl
    components V (pCMV_mVenus_YFP)/ µl V(pAAV_MCS) / µl
    DNA 4.23.5
    BSA (10x) 33
    Buffer 4 (10x)33
    Enzyme: NotI (no.Lab:159)1,51,5
    H2O18,319
    Total volume3030
  • Incubation: 1 1/2 h at 37°C
    1% Agarose gel
  • 1% agarose gel was repared, gel ran for 45 minutes(119 V)
    Results: unexpected sizes of fragments (see protocol), try again next day with an ethidium bromid gel


    Production of chemical competent E.coli

    Investigators: Patrick and Jessica


    competent E.coli XL-1-blue and competent E.coli BL21 produced according to the standard-protocoll Media:production of competent E.coli.pdf



    Design of MCS-Oligos

    Investigators: Bea, Adrian, Hanna, Sven


    In order to replace the multiple cloning site of the pAAV_MCS vector from Stratagene by RFC25, two oligos were designed. After their hybridization the overhangs correspond to ClaI- and BglII restriction sites. A digestion with BglII and ClaI will be performed with pAAV-MCS and then will be ligated with the designed oligos.
    The oligos (see link) were ordered at Sigma-Aldrich. Estimated shipment: 31.05.2010 .


    File:Freiburg10 Oligos MCS RFC25 for pAAV.pdf

    15. Labortag 26.05.2010

    Repetition: Cloning of pAAV_MCS + pCMV_mVenus_YFP

    Investigators: Bea, Hanna, Jessica

    • Repeat cloning of pAAV-MCS + pCMV_mVenus_YFP --> Goal: pAAV_mVenus_YFP
      Cloning did not work (see lab day 25.05.2010) either with NotI or with NotI-HF. Gel did not show any proper band at the expected size.
      There will be used EtBr instead of gelred in the agarose gel and the incubation time of digestion will be prolonged. Further details are followed.
      NOTE: There are three restriction sites of NotI in the pCMV-mVenus_YFP. If cloning with NotI, the polyA hGH signal will be deleted. therefore cloning with NotI is not possible .

    • Test digestion of pCMV-mVenusYFP with PstI and MluI

    Digestion

    • experiment date: 26.05.2010
    • plasmid: pCMV_mVenus_YFP; number: P5; production date: 21.05.2010/ pCMV-MSC; number: P2; production date:
    • buffer used: 3/4; Restriction-enzymes used: Enzyme PstI (no. Lab:48) and Enyzme MluI (no. Lab:40) / NotI HF (no. Lab:159)
    • DNA concentration plasmid: P5 477,3 ng/µl / P2 550ng/µl
    • components V (pCMV_mVenus_YFP)/ µl V(pCMV_MCS) / µl
      DNA 4,23,6
      BSA (10x) 22
      Buffer 3 (10x)22
      Enzyme: PstI/NotI HF (no.Lab:48/159)12
      Enzyme: MluI (no.Lab:40)1-
      H2O9,810,4
      Total volume2020


    • Incubation: 1 h at 37°C
      1% Agarose gel
    • 1% agarose gel was repared, gel ran for 45 minutes(119 V)
      Results: Test digestion of pCMV_MCS with NotI delivered plausibel results (expected fragment size: ~ 27 kbp and 17 kbp). Unfortunately the digestion of pCMV_mVenus_YFP with PstI and MluI resulted in one 2.9 kbp and one 1.2 kbp fragment, which didn't correspond to the expected fragment sizes of 19 kbp and 33 kbp - but to fragment sizes of pCMV_MCS without mVenus_YFP!


    Ordering oligos

    Bea
    Oligos have been ordered for modifying the ITRs. Deletion of PstI restriction site in ITR.


    right ITR of pAAV_MCS

    oligos ordered:

    fwd: 5´- gcgcagctgcctgcaCGGGCGCCTGATGCGG -3´ 77 °C, 31 bp
    rev: 5´- CCGCATCAGGCGCCCGTGCAGGCAGCTGCGC -3´

    leftITR of pAAV_MCS

    oligos ordered:

    fwd: 5´- CCTTTTGCTCACATGTCGTGCAGGCAGCTGCGCG -3´ 74 °C, 34 bp
    rev: 5´- CGCGCAGCTGCCTGCACGACATGTGAGCAAAAGG -3´

    For further details see link

    http://www.molbiotech.uni-freiburg.de/iGEM/wiki2010/images/4/44/Freiburg10_Oligos_ITR_mutagenesis_for_pAAV_delete_PstI.pdf </li>

    Test-Trafo of chemical competent E.coli cells

    Hanna
    The competent E.coli XL-1-blue and competent E.coli BL21 which were prepared the day before were test-transformed with pUC18 - following the standard protocol. Cells were plated on agar plates containing ampicillin and stored over night at 37°C. Further on two control plates containing ampicillin or kanamycin were prepared. Non-transformed cells were plated on them and also stored over night at 37°C.

    16. Labortag 27.05.2010

    Cell counting

    Investigator: Patrick, Adrian, Chris W. Christian L.

    • Meeting

    cell counting:

    • BL21 + PUC18 Trafo 54*4 = 216
    • XL1B + PUC18 Trafo 30*4 = 120

    digitalization of recipe-cards (Christian L.)

    17. Labortag 31.05.2010

    pAAV_RC R585A and R588A transistions

    In order to alter the tropism of AAV2 several modifications have to be performed. First of all the binding to Heparan Sulfate Proteoglycan has to be disrupted. This can be done by R585A and R588A transistions:

    Freiburg10 R585A R588A.jpg


    => Go to Labjournal June (labday 18 - 45)