Difference between revisions of "Part:BBa K3505025"

Revision as of 19:28, 27 October 2020

ParaBAD:RBS-FFAR2:AVPR2 tail:TCS-LacI-terminator

Usage and Biology

This composite part constitutes the G-protein coupled bioreceptor composite of the dual TANGO-GPCR assay (the other part is the b-arrestin-2 constituent, placed under the control of the arabinosed-induced promoter. FFAR2 is a naturally found eukaryotic GPCR protein that exhibits high affinity for SCFAs (acetic, propionic and butyric acid)(Dogra, Sona, Kumar and Yadav, 2016) . After background searching through the NCBI database, we have identified the gene coding sequences needed for the designing of this gene construct. More specifically, a vasopressin receptor 2 segment has been attached to the C-terminal of the receptor, as it mediates recruitment of a TEV tagged b-arrestin-2, along with a TEV cleavage site. When TEV protease cleaves , the lac repressor is released and binds to the lac operator . In the presence of SCFAs the GPCR is activated.

Design Notes

The coding sequence was domesticated . We removed BsmBI ,BsaI , BtgZI, BpiI sites in order to be compatible with GoldenBraid and MoClo. The sequence is cloned in alpha1R vector BBa_K3505008 and has overhangs compatible for Golden Braid cloning.

Figure 2. The level B module of GPCR-Tango Module : a1R:ParaBAD:RBS-FFAR2:V2tail:TCS-Lac-Double terminator

Verification of Cloning

Fig.1:: (U=Uncut , C= Cut) Restriction digestion a1R:ParaBAD:RBS-FFAR2:V2tail:TCS-Lac-Double terminato (C1a-C4b) with : BamHI(C1a-C4a) , Expected bands : 2847+2225 bp , EcoRV (C2a-C2b) ,Expected bands : 3587 bp + 2845 bp, Positive result: C1,C2,C3,C3 (C1a and C1b is the same sample etc)

Sequence and Features