SDS-PAGE-resistant protein complexes

Bernard Heymann bheymann at
Tue Jun 21 11:05:23 EST 1994

In article <Mailstrom.1.03.12087.15089.agibson at>,
agibson at ACS.UCALGARY.CA (Allan Gibson) wrote:

> Hi!  Has anyone on the net ever had experience with protein complexes that are
> not dissociated under normal SDS-PAGE conditions, i.e. brief boiling in SDS
> sample buffer containing 2% SDS and 5% 2-mercaptoethanol. If so, I'd appreciate
> very much hearing from you and finding what conditions, if any, might break such
> a complex into its components.  Thanks.   
> Allan   


This is very interesting! Which complex are you working with? 

The one sure way of dealing with this is to run an urea-containing SDS-PAGE
gel, or to denature your protein in urea before adding sample buffer. The
urea itself usually does not affect migration in the gel significantly. A
useful reference is:
	     Ito et al. (1980) JBC 255, 2123.

Bernard Heymann
bheymann at

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