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.

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