Part:BBa_K775004

GPCR reporter FUS1-EGFP

This reporter can be used in combination with the expression of a G-protein coupled receptor in yeast. The FUS1 promoter is a promoter in the mating pathway (a G-protein coupled receptor pathway). If the receptor of this pathway is activated by the pheromone of the opposite mating type the mating pathway is activated and the FUS1 promoter is switched on.

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  INCOMPATIBLE WITH RFC[21]

  Illegal BamHI site found at 201
  
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]

GFP intensity of S. cerevisiae cells transformed with FUS1pr-EGFP at t=5.10 after induction with alpha pheromone. Please also see our page: [http://2012.igem.org/Team:TU-Delft/part2 Reporter]

GFP intensity and growth curves of S. cerevisiae transformed with FUS1pr-EGFP after induction with alpha pheromone

Improvement Part of BBa_K775004

iGEM18_NEFU_China creat a new parts BBa_K2542014，which is based on BBa_K775004. BBa_K2542014 is more suitable for somewhere which needs low expression in yeast.It's allows a type yeast to sense the α factor secreted by α-type yeast and express green fluorescent protein. We modified the part BBa_K775004 of the previous team by turning mutating the sequence “AAAAAA” into “GCCACC” to make the expression efficiency weaker，and make it more appropriate for suicide gene（[http://2018.igem.org/Team:NEFU_China/Suicide Information Destroyed ]). We constructed two plasmids with different kozak sequences and transferred them into yeast. Then, we use SD-Trp medium to culture yeast, and add with the solution which containing α factor. The solution containing α factor is obtain by extracting the liquid supernatant of the culture medium for culturing α-type yeast. After we add 200ul the α factor sloution to each one and culture yeast for 20 hours，we measured the expression of GFP in yeast by flow cytometry.

Measurement

In the project of 2018, Tsinghua-A team, the part BBa_K775004, the pheromone responsive element pfus1, together with a EGFP reporter gene, was inserted to the plasmid pYES2 which has its original GAL1 promoter removed through HindIII digestion, yielding plasmid pYES2-pfus1-EGFP. pYES2-pfus1-EGFP was transformed into a-typed yeast strain CEN.PK2-1C. After the addition of α factor, compared with the non-induction group, EGFP intensity inside the yeast got stronger from the 1h group to 5h group, these yeast cells also experience chemotropic growth. 6h after the addition, it seems EGFP protein was released into the medium,as showed in the following figures, while Flow Cytometry data suggested the high background, or low siganl noise ratio in this experiment, may due to the lost of plasmids. See [http://2018.igem.org/Team:Tsinghua-A http://2018.igem.org/Team:Tsinghua-A]for detailed description.