Revision as of 07:48, 20 July 2019

pT7-CBDcipA-AsPink

A cellulose binding domain (CBDcipA) from Clostridium thermocellum Cellulose scaffolding protein (CipA) which can be used to purify or attach proteins to cellulose, this part has a AsPink fused to the CBDcipA. The part also has a flexible GS-linker (-GGGGSGGGGS-) with a thrombin site (-LVPRGS-, thrombin RS) added at the end, clevage with thrombin will add one glycine and one serine to the N-terminal of the C-terminal fusion protein of the CBDcipA. Also added a BamHI recognition sequence (BamHI RS) to enable changeable fusion protein to the CBDcipA. BamHI was chosen because its RS codes for one glycine and one serine, fitting it to the end of the thrombin site, BamHI is also a cheap enzyme and can be used with methylated DNA.

The part has a very strong expression with a T7 promotor (BBa_I719005) as well as a 5'-UTR (BBa_K1758100) region which has been shown to further increase expression in E. coli (BBa_K1758106), ([http://www.ncbi.nlm.nih.gov/pubmed/2676996 Olins et al. 1989]), ([http://www.ncbi.nlm.nih.gov/pubmed/23927491 Takahashi et al. 2013]). Both this part and the part were sfGFP was changed for AsPink (BBa_K3182000) showed great expression.

Figure 1. E. coli BL21 cells expressing this biobrick, incubated for 16 hours at 16°C at 80 rpm in 1 litre of LB-miller.

Figure 2. Lysated (via sonication) BL21s which are expressing the biobrick. It is lysate from the culture above in figure 1. Incubated for 16 hours at 16°C at 80 rpm in 1 litre of LB-miller.

Figure 3. Centrifuged lysate of BL21 culture which express the biobrick. It is the same culture as figure 1 and 2. A pellet of non-lysated bacteria can be observed.

Potential Usages

AsPink can for example be used as a reporter for CBD binding ability, track purification of the CBD or report linker breakage. By including a BamHI site on the linker; the asPink can be switched with another protein.

Sequence and Features