Actually I exprssed 6 differnt truncations from the same protein as a GST fusion proetin. These constructs were predicted to be unstrucured. After I purified the constructs ( the size between 32-35 kDa)and run them onto SDS-PAGE with the GSH beads two of them ran above 36 kDa and the others about or less than 31 (KDa Mark12 standard). I repeated the expreriment 3 times with the same results. Also there were some degradations.
Is it possible for those similar fragments of protein to run at different level/mass based on structure in denatured condition. Do the beads could affect the movements of proteins on Gel.
However, when I ran the pre and post induction samples all constructs seemed to run at similar size about 30/31 kDa.
any suggestions are highly appreciated.
Edited by saad, 13 May 2011 - 06:59 AM.