Lysing E,coli in guanidine HCl

Andy Phillips Andy.Phillips at
Tue May 16 07:00:22 EST 1995

A colleague of mine is trying to purify His-tagged fusion proteins 
from E.coli (BL21 DE3) by Ni-NTA affinity chromatography under 
denaturing conditions. The method she's following recommends lysing
the bacteria by resuspending the pellet in 6M guanidine HCl. 

After pelleting undissolved material, she ran aliquots of pellet and 
supernatant on SDS-PAGE, and found that there appeared to be 
incomplete lysis of the cells. Has anyone out there experience of 
this? What did you do to improve cell lysis? Sonication? Pre-treatment 
with lysozyme? Any iodeas?

Thanks in advance

Andy Phillips (andy.phillips at

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