Difference between revisions of "Part:BBa K165096"

Revision as of 05:37, 30 October 2008

Zif268-HIV bs + MET25+ Gli1 repressor (CFPx2 tagged) on pRS304*

This construct is an example of the Tau element of our genetic limiter network. In this case, the pMET25 sets the threshold of limitation, allowing us to tune the threshold by varying the concentration of methionine in the media the cells are grown in. We constructed the Gli1 repressor in this devise with CFPx2 instead of mCherry, allowing us to distinguish it from the other repressors in the network. It is placed in a mutually inhibitory relationship with repressor alpha, in this case the Zif-HIV repressor. When the network is subthreshold, this tau repressor is expressed, and represses R, turning off its repression of the gene of interest.

The SpeI site is of no consequence, as the utility of parts on pRS vectors is to integrate into the yeast genome.

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: 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: mCherry in the nucleus from Alpha and R induction. YFP in cytosol levels out at threshold limit despite rising induction.

Sequence and Features