Hey Researchers,
i am working with transformation of membrane protein by using BL21(DE) competent cell. i transformed plasmid (pET28a(FLAG, His tag) and co-transformed with pULTRA-ambryx. i expressed and purified the protein but i got following results.
1) WT peak on Mass chromatogram (Plasmid are not used).
2) got very 2 colonies only.
3) Subculture have shown no growth.
4) sent overnight culture for sequencing (no plasmid found)
How i can get rid off from all these.
looking forward your expert opinion.
Thank you so much for your time.
Shahid