Team:Warsaw/SyntheticCloning/SyntheticCloning

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<h2>Step by step guide to synthetic cloning</h2>
<h2>Step by step guide to synthetic cloning</h2>
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<div class="note">Artist's impression on synthetic cloning</div>
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<img src="https://static.igem.org/mediawiki/2011/1/1f/Comix.png">
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<div class="note">Rationale behind the protocol</div>
<div class="note">Rationale behind the protocol</div>

Revision as of 01:53, 21 September 2011

Example Tabs

Step by step guide to synthetic cloning

Artist's impression on synthetic cloning


Rationale behind the protocol
  • 1. Cut DNA with one of the enzyme you want to use in cloning
  • 2. Dephosphorylate 5' phosphate - this prevents DNA pieces from self-ligation
  • 3. Cut DNA with the other of the enzyme you want to use in cloning
  • 4. Run DNA on the gel
  • 5. Extract vector and insert from the gel.
  • 6. Ligate
  • 7. After ligation some linear DNA may still remain, you can get rid of it by using recBCD exonuclease and Exonuclease I
  • Linear DNA is a perfect template for RCR amplification with phi 29 polymerase. It generates the long linear concatamers of the DNA from circular templates.
  • After 16 hours of amplification you have the DNA of your construct

This is how we did it
Our protocol:
  • 1. Digest insert and vector with Fermentas Fast enzymes
    • insert with XBAI and at the same time add CIAP(Digest 1: 3ul reaction buffer; 1restriction enzyme; 5 ul DNA; 20ul water and 1ul CIAP), deactivate enzymes at 65C for 20 min, then digest insert with PSTI(simply add 1ul of the enzyme).
    • vector with PSTI and at the same time add CIAP(Digest 1: 3ul reaction buffer; 1restriction enzyme; 5 ul DNA; 20ul water and 1ul CIAP), deactivate enzymes at 80C 20 min, then digest insert with SPEI(simply add 1ul of the enzyme)
  • Prepare Lithium-botare agarose gel. Gels in LB buffer can be can run on much higher voltage we use 300-400V and gel is ready in 15 minutes. Theoretically maximum you can use is max. 100V/cm, but we never tried that much.
    • (1L 20 times concentrated LB gel buffer =>950 mL of dH2O, 8.392 g lithium hydroxide monohydrate; 36 g of boric acid; pH 8.2. Volume to 1 L)
  • Run the DNA on the gel and extract insert and vector
  • Ligate:7 ul H20; 5 ul insetr; 5 ul vector; 2 ul buffer; 0.5 ul Ligase incubate for 15 min at 25C
  • Perform exonuclease digestion (2,5 recBCD exonuclease buffer; 2ul ATP; 1ul recBCD (Epicentre) ; 1 exonuclease I (Fermentas); 1 ul ligation mixture; 17,5 h20. Inactivate the reaction at 80C for 20 min
  • 3. Set up the annealing mix as described:
    • 1ul of the reaction mix after exonuclease treatment
    • 1ul Phi29 polymerase buffer
    • 1ul PTO(phosphothioate protected) random RNA hexamers - 400umol, you can get them from IBA-GO
    • RNAse free water to 10ul
  • 4. Set up the annealing reaction:
    • heat mix to 95C
    • cool down to 95C, slowly 0.1C/s works
  • 5. to the annealing mix add :
    • 1ul 10umol DNTPs - it is best to use RNAse free
    • 1ul phi29 polymerase from Epicentre
    • 2ul phi 29 buffer
    • 1ul diluted Pyrophosphatase from Fermentas. Diluted 1:100 according to the manual
    • RNAse free water to 30ul final volume
  • 6. Incubate at 30C for 16h
An excelent protocol on how to perform cell-free cloning is available here: Takahashi H, Yamamoto K, Ohtani T, Sugiyama S. Cell-free cloning using multiply-primed rolling circle amplification with modified RNA primers. Biotechniques. 2009 Jul.

Results of the cell-free cloning
5ul of the RC reaction were digested with Eco and PST. Insert and vector clearly visible, There are no unspecific products visible. Angry face

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