Difference between revisions of "Part:BBa K243025"

Revision as of 19:08, 21 October 2009

Strep-FluA-Middle Linker-Fok_i

This combination uses the benefits of an Streptavidin-tag for purification. It is also linked with a FluroescineA-tag. The Middle Linker (GlySerGlyGly)x2 connects the parts and adds additional space between them to guarantee the independent function of FluA tag and the protein domain Fok_a.

Usage and Biology

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 FluroescineA-tag allows the measurement by quenching and the coupling to an flurescein linked oligo. Emanating from our 3D modeling this combination of FluA tagged oligo and the construct containing the protein domain Fok_i is more efficiently than the use of a combination of DigA tagged oligo with a construct containing Fok_i, whereas the combination of DigA tagged oligo and constructs consisting Fok_a seems to be more efficiently. To avoid interactions between the FluA-tag with the connected protein domain Fok_a we applied the Middel Linker. The Linker itself has no influence of the connected parts. We decided to use the Middle Linker for this construct to prove the optimal distance between the parts. It is important that the used linker has a certain flexibility and is long enough to avoid steric interferences between the parts. If the linker is too long it might cause a instability of the whole construct.

Sequence and Features