Hi all,
I have set of constructs in pE-SUMO and pET49b vector, with all of which I can do CaCl2 mediated transformation of DH10B or DH5alpha cells, but neither of them are being transformed in BL21 (DE3) RIL, BL21 (DE3) Star, BL21 (DE3) Star pLysS, Rosetta (DE3) or Rosetta (DE3) pLysS. I am failing to understand the possible reason behind this phenomenon.
NOTE: They all are sequencing confirmed plasmids.
I am wondering if any of you could shed some light on it??