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GST Antibodies

Dr A.H.M. Van Vliet AVV2 at le.ac.uk
Sun Oct 27 16:44:39 EST 1996

Dear Evan,

I've used the GST-protein as a carrier when I worked on a ELISA
for cowdriosis, a tick-borne disease of domestic ruminants in
Africa and the Caribbean. The fusion-protein based ELISA worked
fine when tested with experimental animals, but when we started
evaluation of field sera derived from Zimbabwean sheep and cattle,
we found that ca. 15% of the sera was positive with the GST-protein.

This of course was very disappointing, but we managed to improve
the test considerably when using the 6His tag (Qiagen's QiaExpress vectors).

If you need the reference for our paper, it's: AHM van Vliet et al (1995),
J. Clin. Microbiol. 33(9):2405-2410.

hope this helps,


eburkala at CENTRAL.MURDOCH.EDU.AU (Evan Burkala) wrote:
>    I was just wondering if any of the many knowledgeable people out 
>there have any idea about the presence of naturally occurring antibodies 
>to the GST fusion protein coded for in the pGEX vector (Pharmacia)? I 
>know it comes from S. japonicum but if one is to use a fusion protein for 
>detection of antibodies to the fusion partner (protein of interest) 
>what is the likelihood of GST antibodies giving false-positives in ELISA 
>in many different animals and even humans. Some parasite experts may 
>comment on the presence of antibodies to GST in natural Schistosoma 
>Any correspondence would be appreciated,
>Evan Burkala
>Murdoch University
>Western Australia

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