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

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