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Team:NRP-UEA-Norwich/Project Mo-Flipper
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Revision as of 21:02, 15 September 2014
Mo Flipper
The little plasmid that could!
As part of the registry standard at iGEM all parts need to be in the same format, much like a computer file. If the files are incompatible (ie, different parts) then they will not work with the rest of the registry. The iGEM registry standard is the BioBrick cloning method; the method utilises 4 type II restriction endonucleases (RENs): EcoRI and XbaI are used in the prefix (the sequence of DNA before the region of interest) and SpaI and PstI are used in the suffix (the sequence of DNA after the region of interest. Systematic use of the 4 type II RENs allows new sections of DNA to be inserted into others.
For our project (Green Canary) we utilised the GoldenGate method of cloning, for more information on the GoldenGate method please see our GoldenGate page here(insert link to page). As previously described the parts submitted to the registry need to be in the same format (BioBrick), but, as all our wet lab work was carried out in GoldenGate, we had to convert our parts to BioBrick for submission. We developed the MoFlipper (Modular Cloning Flipper) which provides users with a oneway swap between GoldenGate and BioBrick. The standard pSB1C3 plasmid was improved and altered to include the GoldenGate REN recognition sites allowing for (near)scarless transfer from GoldenGate to BioBrick. The modified pSB1C3 contains two divergently orientated BsaI sites between the 4 BioBrick sites which will allow the GoldenGate fragments to be dropped into the (now) BioBrick vector for submission. The improved pSB1C3 part now contains the GoldenGate recognition site as well as a RFP coding device that will allow for red white selection of the transformants.
As discussed in our GoldenGate page the modules have specific 5’ and 3’ overhangs which correspond to their final position within the level 1 and then 2 constructs. We have developed 4 MoFlippers that will accept constructs designated promoters (GGAG —> AATG), coding sequences (AATG —> GCTT), terminators (GCTT —> GCGT) and a whole construct (GGAG —> GCGT) using the 4 base pair overhangs shown.
As GoldenGate uses type IIs restriction enzymes (that cleave outside of their recognition sequence), the sequence or part can be inserted into the MoFlipper, and not leave the recognition sites of BsaI, and then is fully functional as a BioBrick.
The NRP-UEA iGEM team are submitting this as an improved part of the pSB1C3 backbone used as the registry standard to allow more teams to work in the GoldenGate method of cloning whilst still being able to submit parts to the registry in the standard.
