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Team:Macquarie/Protocols/Designing Gibson Assembly Fragments
From 2012.igem.org
Contents |
Haemoxygenase
- Original Gene Sequence: http://www.ncbi.nlm.nih.gov/nuccore/BA000022
Deinococcus radiodurans Bacteriophytochrome
- Original Gene Sequence: http://www.ncbi.nlm.nih.gov/nuccore/15807672/?from=53908&to=56175&strand=true&report=genbank
Agrobacterium tumefaciens Bacteriophytochrome
- Original Gene Sequence: http://www.ncbi.nlm.nih.gov/nuccore/159184118/?from=1954292&to=1956502&strand=true&report=genbank
BioBrick assembly using Gibson method: Fragment design
- Codon optimisation:
The Amino acid sequences for Haemoxygenase (synechocystis) and Bacteriophytochrome (Deinococcus radiodurans and Agrobacterium tumefaciens) were initially run through the Reverse Translate program (http://www.bioinformatics.org/sms2/rev_trans.html) for codon optimisation in E. coli BL21 .
- BioBrick standardisation:
Each sequence must conform to standard BioBrick part specifications which can be found here (http://partsregistry.org/Help:BioBrick_Prefix_and_Suffix). These standard components were added to our sequences in silico with the addition of an appropriate promoter such as T7 (http://partsregistry.org/wiki/index.php?title=Part:BBa_I712074) (Required for E.coli BL21) and a RBS/Shine-dalgarno sequence which was taken from the iGem 2010 Macquarie team (http://partsregistry.org/wiki/index.php?title=Part:BBa_K646000).
Standard BioBrick Structure: EcoR1-Xba1-T7-RBS-ATG-(Gene insert)-TAATAA-Spel-Pst1.
Finally each DNA sequence was run through the restriction digest program (http://tools.neb.com/NEBcutter2/). This was performed to determine if the BioBricks contained any of the standard restriction sites such as EcoR1-Xba1 -Spel-Pst1 internally. These must be removed from the DNA sequences by changing codon usage in that sequence without changing the Amino acid sequence. We found that Agrobacterium tumefaciens and also Deinococcus radiodurans contained internal Pst1 restriction sites which we had to removed from the in silico sequences.
