I am trying to express a transporter protein in yeast. After transformation and upon selection in SD medium, the transformant colonies turn yellow. Anyone have hints on that?
How long does it take to grow the clones? On SD, clones are turning yellow/brown when getting old. The other reason might be the chemical properties of the transported molecule accumulating in the cell.
Did you try to grow your clones on YPD media. It could be that your transporter leads to some kind of toxic response in SD media. Can you not try minimal media with amino acids for specific axotrophies.