"conservative" mutagenesis withinin SV40 promotor

[Wolfgang Schechinger]

hi all, 

I got hooked by some sort of tricky problem:

In my vector (pCDNA3) the NeoR gene is driven by the SV40 
promotor. Near the end of this promotor there is a XmaI site that 
interferes with my cloning strategy. 
Actually I'd use the quick change protocol in order to mutate the 
sequence to destroy the XmaI site. It's very likely 
that I'll destroy the promotor this way. 
How may I circumvent this obstacle?

The context is caaaaagctCCCGGGagctt (XmaI site in uppercase)

I'd appreciate your comments!

Wolfgang
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Dr. Wolfgang Schechinger, Dept. of Pathobiochemistry
University of Tuebingen, Germany
email: wolfgang.schechinger at med.uni-tuebingen.de 
wwWait: http://www.medizin.uni-tuebingen.de/~wgschech/start.htm
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usual disclaimers apply 
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