CTAB and Membrane Protein Purification
federici at icgm.cochin.inserm.fr
Fri May 10 08:40:32 EST 1996
In article (Dans l'article) <3187492D.3FDC at igmors.u-psud.fr>, Mark Blight
<BLIGHT at igmors.u-psud.fr> wrote (écrivait) :
> Does anyone have any experience with CTAB as a detergent for membrane =
> protein purification?
> I recently checked a range of detergents for the solubilisation of an =
> E.coli integral inner membrane protein and CTAB was on the shelf (we use =
> if for DNA preps' usually). Since CTAB is a close relative of CDAB =
> (Cetyldimethylethyl ammonium bromide) which is a cationic detergent, I =
> tried it out.
> To my great suprise CTAB worked extremely well and efficiently =
> solubilizes my membrane protein out of the cell envelope. Out of 10 =
> detergents tried only Triton-X100, IGEPAL and CTAB worked.
> I would be very interested in any comments upon the use of CTAB for =
> membrane protein (or just "protein") purification.
> M. Blight, =
> Institut de G=E9n=E9tique et Microbiologie,
> B=E2timent 409,
> Universit=E9 de Paris XI,
> 91405 Orsay cedex
> Tel: (+33 1) 69 41 66 99
> Fax: (+33 1) 69 41 78 08
> e-mail: blight at igmors.u-psud.fr
For E.coli proteins to be purified, DNA must be eliminated; (nucleic acids
represent 7% of the wet weight or 23,6% of dry weight of cells). CTAB is
used in this purpose. The final content of CTAB is determined by: nucleic
acids/CTAB=1 (W/W).This rate must be respected, because an excess of CTAB
would react with SDS and hinder a following SDS-PAGE. (you must know that
CTAB is also used to complex SDS and, by this way to destroy SDS-protein
complexes; so, an extraction of proteins from a SDS solution can be
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