Part:BBa_K3064026

9xGSP-GFP

This composite part is made up of a kind of improved promoter which is sensitive to particular high blood glucose concentration and EGFP sequence. The introduction of EGFP makes it possible to examine the expression of this composite part. As designed,the part can be used as a glucose-sensing promoter with GFP reporter system.

Usage and Biology

Because there is high blood glucose concentration in diabetics, in order to get improved gene which is sensitive to diabetics it’s convenient to employ promoter which reacts to high blood glucose. Transcription factor -- ChREBP -- can be effectively expressed with high blood glucose. Meanwhile, heterodimer which consists of ChREBP and Mlx can combine with gene promoter CHoRE to induce gene transcription. Therefore, we choose CHoRE as promoter of engineered plasmid and connect it with minP to indicates a transcription start site. In addition, we increase the number of CHoRE to realize that engineered gene will be activated by particular high blood glucose concentration instead of normal blood glucose concentration. Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  COMPATIBLE WITH RFC[21]
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]

Characterization

This part BBa_K3064026 was cloned in pcDNA3.1+ and transfected into HepG2 cell lines using Invitrogen LipofectamineTM 3000. Protocol could be found in our Experiment page.

<ahref="https://2019.igem.org/wiki/images/1/1b/T--NUDT_CHINA--Protocol_for_lipo3000_transfection_with_Lipofectamine%E2%84%A2_3000_Reagent.pdf">Click to see </a>

To conduct the later function test, we set two different groups to conduct the transfection. One is pcDNA3.1-9xGSP-GFP and the other one is plv-mcherry as the internal control. We transfected 300μg into HepG2 cells, which were cultured on 24-hole plate. When 90 percent were mixed, we begin the transfection. At the very first beginning, we starved the HepG2 cells with DMEM for 2 hours before transfection begins.After transfection 12h, we starved the cells with glucose-free culture and stimulate with 20mM glucose concentration culture after 6 more hours. Glucose stimulation intensity was controlled at 20mM. Samples were tested after transfection of 48h. Figure 1. Steps of transfection and function test.