I have been trying to express an eukaryotic protein in E.coli, but in vain. Their have been no induction using IPTG and the vector was of pet series. So, I have planned to clone it in a saccharomyces vector, using yeast expression system. I have a pESC series vector containing FLAg tag and MYC tag as well. Which do you think might work well for getting soluble protein of better yield?