I have been using an osmotic shock (20% sucrose and then water - taken from
"current protocols" or the pET manual) - based protocol, for the extraction
of a protein expressed with pET26b (periplasmic exp. with a pelB leader
It looks fine on the small scale (>50ml culture), but I'm having trouble
up-scaling it to ~1L.
does anyone know a protocol designed for large scale periplasmic preparation
Optics & Biology group,
Ecole Normale Superieure, Paris