"A great building will never stand if you neglect the small bricks"Ifeanyi Enoch Onuoha
Constitutive TEF1 promoter
hrGFP codon-optimized for Yarrowia lipolytica
Composite part consisting of the TEF1 promoter and the human proinsulin gene codon-optimized for Y. lipolytica
Human proinsulin codon-optimized for Y. lipolytica
SCR1'-tRNA promoter expressing sgRNA
hrGFP expressed by the constitutive TEF1 promoter
Semi-synthetic shuttle vector pSB1A8YL
Composite part of TEF1 and enhanced YFP
Composite part of TEF1 and enhanced CFP
Improvement and Characterization of Two Existing Parts
In our laboratory work, we wanted to work with the two BioBricks; BBa_K530001 (crtE gene) and BBa_K530002 (crtI gene) created by the John Hopkins iGEM team 2011. The genes encode the two enzymes Geranylgeranyl Diphosphate Synthase and Phytoene Desaturase, respectively, both from the wildtype strain of xanthophyllomyces dendrorhous used in the biosynthesis of beta-Carotene.
When looking into the specifications of these BioBricks, we realized that both genes contained illegal restriction sites.
BBa_K530001 contained an AgeI restriction site making the part incompatible with the RFC25 Freiburg Standard. The RFC25 standard allows for in-frame assembly of protein domains. BBa_K530002 contained the illegal restriction site BglII making the part incompatible with the RFC21 Berkely Standard, which enables in-frame assembly of proteins.
We wanted to overcome these obstacle by removing the illegal restriction sites from the above described Biobricks.
How did we do it?
The illegal restriction sites were removed using site directed mutagenesis with primers containing nucleotide substitutions in the two restriction sites (see Figure 1).
The new plasmid, BBa_K2117012, with the removed AgeI restriction site was double digested with the enzyme and SpeI to test if we had successfully removed the AgeI restriction site.
The sequencing results show a substitution in the restriction sites corresponding to the nucleotide substitution designed in the primers (Table 1).
Improvement of Characterization
Sequencing results of BBa_K530002 showed nucleotide substitutions in the prefix and a large deletion in the suffix.
The alterations in prefix and suffix make the BBa_K530002 incompatible with the BioBrick standard