Difference between revisions of "Part:BBa K165078"

Revision as of 06:16, 30 October 2008

LexA activable reporter on pRS306

This activator reporter consists of the LexA binding sites on the minimal mCYC promoter driving expression of YFPx2. It is the G construct in the limiter system, modeling an endogenous gene of interest for our proof-of-concept.

Usage and Biology

To build a (heretofore untested) limiter, this part should be in a yeast strain with the following constructs:

A) Part:BBa_K165080 pGAL1 + Untagged LexA activator on pRS305
G) Part:BBa_K165078 LexA activable reporter on pRS306

  Into mating type a.  Knock out the Gal2 gene for a tunable level of induction.

R) Part:BBa_K165090 Gli1 bs + LexA bs + mCYC + LexA repressor (mCherryx2 tagged) on pRS306
Alpha) Part:BBa_K165095 Gli1 bs + LexA bs + mCYC + Zif268-HIV repressor (mCherryx2 tagged) on pRS303
Tau) Part:BBa_K165096 Zif268-HIV bs + MET25+ Gli1 repressor (CFPx2 tagged) on pRS304*

  Into mating type alpha. Knock out the Gal2 gene for a tunable level of induction.

Mate the two types, select on SD-His-Trp-Leu-Ura

Inputs: Set the threshold by tuning [Met] between 0 and 500 uM Set the level of induction (A) with Galactose between 0-3%

Outputs expected:
Subthreshold [A]: CFP in the nucleus from Tau, YFP in the cytosol proportionate to subthreshold induction from G being activated by A and not repressed by R.
Superthreshold [A]: mCherry in the nucleus from Alpha and R induction. YFP in cytosol levels out at threshold limit despite rising induction.

In a strain into which we transformed the LexA activator and LexA activator reporter, we found this part to be functional. After growing in 2% galactose/2%raffinose, under the confocal fluorescence microscope we saw mCherry expression in the nucleus (on the activating transcription factor), and its effect of inducing YFP expression in the cytosol from the activator reporter. See below:

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Sequence and Features