Difference between revisions of "Part:BBa K243036"

Revision as of 02:07, 22 October 2009

His-Dig-Split Linker-Fok_a

This combination uses the benefits of a His tag (Polyhistidin tag) for purification. It is also linked with a DigoxigeninA 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_a.

Usage and Biology

This composite part is one part of our universal endonuclease and it needs another composite part like BBa_K243010 to build a functional heterodimer. The DigA tag guides the part to the DNA which is hybridized with a Digoxigenin labeled oligonucleotide. The Split Linker creates a distance of 51bp between the DigA and the linked Fok_a protein domain. The His Tag serves as a purification tag for Ni-NTA column purification.

Application

At least we succeeded to produce a working universal endonuclease with this part in combination with the part BBa_K243010, by cotransformation into E.coli(XL1blue). The part BBa_K243010 was cloned into our expression vector BBa_K243033 and this part was cloned into the vector pJS419 BBa_K243035. The made a cutting assay was conducted with cleared cell lysate and DNA hybridized with oligonucleotides labeled with fluorescence molecule(Cy3). The two proteins linked to the hybridized oligonucleotides and cut them at chosen site into the half.We proved the cutting event by gel electrophoresis and excitation of the fluorescent.

Gellanes:1.Marker(1kb ladder mix)2.Cell extract+sample1 3.Cell extract+sample2 4.control w/o cell extract.

Sequence and Features