Hi, experts.
I'm trying to expressed recombinant transmembrane protein incorporated with nucleophilic non-canonical amino acids(ncAAs) by genetic code expansion (GCE) in E.coli. I replace tyrosine with the ncAA but every time Glutathion (GSH) replaced ncAA in recombinant Protein. i tried following expression methods.
1) Cytoplasmic expression: pET28a vector, with his and FLAG tag,
Problem: always GSH protein expression.
2) Periplasmic Expression: pET26b-pelB-FLAG-His.
His tag is not working but protein is expressed.
I need your expert solution. How i can get rid-off from this problem.
Thank you so much for your time and looking for your expert opinion.