Difference between revisions of "Part:BBa K1497024:Design"

The here presented BioBricks are improved for the construction of scaffold proteins by introducing BglII and BamHI restriction sites flanking the domain sequence. Additionally, C-terminal linker domains consisting of glycine and serine residues were added to the scaffold domains. New scaffold sequences can be constructed by standard cloning approaches (see Figure 2). As usual, a backbone is ligated with an insert to create the desired sequence. For example a new scaffold protein consisting of two domains can be constructed by ligating a backbone vector including the desired N-terminal scaffold domain with an insert containing the desired C-terminal domain.  For this, the backbone has to be digested with the restriction enzymes BamHI and PstI cleaving the plasmid downstream of the first domain. In contrast, the insert has to be extracted from its vector by digestion with BglII and PstI. The overlap sequcences of the BglII and BamHI restriction sites are complementary. Thus, the insert can be ligated behind the first domain into the backbone. The scar sequence resulting from a combination of a BglII with BamHI restriction site cannot be recognized by nether of the enzymes. Therefore, a single ligation creates a new scaffold BioBrick immediately, which is again flanked by a BglII and BamHI sequence. Of course, more sophisticated scaffold BioBricks can therefore be constructed from composite BioBricks containing more than one domain or again by iterative cloning of single domains behind an initial domain.