Apparent MW of protein on-PAGE gel > real MW?
bhuang at magnus.acs.ohio-state.edu
Mon Mar 7 16:40:08 EST 1994
A fusion protein I expressed in E. coli has a apparent MW on SDS-PAGE gel ~5 kd
lager than it's calculated MW. This protein is 303 aa residues with a
calculated MW of 35 kd but it runs at 40 kd position on SDS-PAGE. The protein
has very high content of basic amino acids (32 lysines, 20 arginine and 16
histidines). My question is : does high content of basic residues make a
protein run slower?
I would apreciate very much any hints to my question.
Ohio state Univ.
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