Difference between revisions of "Part:BBa K2206008"

Revision as of 08:49, 3 October 2017

Toehold switch for hsa-miR-15b-5p with luciferase and inducible promoter

Toehold switches are synthetic riboregulators that regulate gene expression post-transcriptionally. Gene expression can be activated in the presence of a cognate single stranded RNA molecule that contains an arbitrary sequence (the trigger RNA). The trigger RNA binds to the switch through base pairing, causing a conformational change that results in translation of the downstream protein coding region.

This part codes for a toehold switch that contains a region that is complementary to the micro-RNA hsa-mir-15b-5p (the trigger RNA). The toehold switch is activated by hsa-mir-15b-5p and regulates production of Luciferase. The luminescence intensity of Luciferase is proportional to the number of toehold switches activated (as the more switches activated, the greater the amount of luciferase is produced), thus indicating the levels of hsa-mir-15b-5p present (as the more micro-RNA there is, the greater the number of switches activated). This part can therefore be used to quantify the levels of hsa-mir-15b-5p.

We believe that the transcripts produced from this part are toxic when expressed at reasonably high concentrations in E.coli (e.g. the concentrations produced from the BBa_J23111 constitutive promoter). An inducible promoter is therefore used to allow for amplification of the constructs in E.coli.

N.B. This part contains a strong RBS sequence

Sequence and Features