Help: His6X proteins

Marc Gwadz mg42 at
Tue Sep 7 14:45:25 EST 1993

I've created a construct that expresses a DNA-binding protein
with a polyhistidine (and factor Xa cleavage site) N-terminus.
It seems to express proteins that behave weirdly in electrophoretic 
mobility shift assays.  Have proteins of this nature been shown
to have altered DNA-binding properties (i.e. increases in 
non-specific affinity for DNA) due to the poly-his tag. 
How effective is cleavage with factor X? Thanks in advance for any

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