post translational modifications and in particular glycosylation differences are the main difference
In addition in correct folding of mammalian proteins in bacteria can lead to larger amounts of insoluble fraction in bacteria compared to eukaryotic expression
Taking both of these factors together the issue therefore has been that expression of mammalian proteins in bacteria leads to a large fraction of functionallay inactive protein
That said unlike the old days there are now bacterial expression strains like BL22 DE3 and Rosetta cells that have been specifically engineered to minimise production of high amounts of soluble active protein
In addition if you express for longer periods (> 12 hours instead of 1 hour) at subambient temp (
post translational modifications and in particular glycosylation differences are the main difference
In addition in correct folding of mammalian proteins in bacteria can lead to larger amounts of insoluble fraction in bacteria compared to eukaryotic expression
Taking both of these factors together the issue therefore has been that expression of mammalian proteins in bacteria leads to a large fraction of functionallay inactive protein
That said unlike the old days there are now bacterial expression strains like BL22 DE3 and Rosetta cells that have been specifically engineered to minimise production of high amounts of soluble active protein
In addition if you express for longer periods (> 12 hours instead of 1 hour) at subambient temp (