Difference between revisions of "Part:BBa K243015"

Revision as of 00:24, 22 October 2009

Strep-DigA-Split Linker-Fok_i

This combination uses the benefits of an Streptavidin-tag for purification. It is also linked with a DigoxigenineA-tag DigA. The Split Linker connects the parts and adds additional space between them to guarantee the independent function of DigA-tag and the protein domain Fok_i.

Usage and Biology

This composite part is one part of our universal endonuclease and it needs another composite part like BBa_K243024 to built to a functional heterodimer. The DigA tag leads the part to DNA which is hybridized with an Digoxigenin labeled oligonucleotide. The split linker makes a distance from 51bp between the DigA and the linked Fok_i protein domain. The Strep-Tag serve as purification tag for Streptavidin column purification.

We applied the Streptavidine-tag to enable a simultaneous purification of constructs with a His-tag. Strep-tag shows also a higher affinity towards Strep-Tactin than His-tag. For that the purification with Strep-tag is more specific. The used DigA-tag allows the coupling to an Digoxigenin linked oligo. Emanating from our 3D modeling this combination of DigA tagged oligo and the construct containing the protein domain Fok_i is not that efficiently than the use of a combination of FluA tagged oligo with a construct containing Fok_i. To avoid interactions between the DigA-tag with the connected protein domain Fok_i we applied the split Linker. This Linker is an improved part of the team Freiburg08 and it is a suitable linker for fusion proteins.

Sequence and Features