Different pH for elution of non-specific Ni column interaction

Bazeille Nicolas nbazeill at etudiant.univ-lr.fr
Wed Apr 19 03:16:04 EST 2006

Hello everybody,

The elution of my His tag protein contain several contaminants which I want to
eliminate. Reading the forum, I've seem that some E.Coli proteins have been to
defined to be responsible of contamination : methyl transferase, HSP 70 cAMP
receptor, Glucosamine 6 P synthase and FK 506 binding protein. Indeed, I can
some contaminant bands on SDS-PAGE. After a theorical estimation of their own
PHi, I want to try to especially elute them using for Glucosamine 6 P synthase
a buffer like [40 mM MES pH 6,1 500 mM NaCl, 10 % Glycérol, 20 mM Imidazole].
For HSP & FK 506 : [40 mM MES pH 5,1 500 mM NaCl, 10 % Glycérol, 20 mM

According to yours opinions, is it a good solution to involve my protein
purification which possess a theorical pHi of 8.02 and an elution at about 500
mM imidazole.

Thanks a lot.

Nicolas BAZEILLE Student LBPA Cachan (94) France.

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