Plant antigens cross-react with rat polyclonal antibodies against KLH-conjugated peptides.

Oulehlová D., Hála M., Potocký M., Žárský V., Cvrčková F.

Keywords: Keyhole limpet hemocyanin; Rat antisera; Synthetic peptides; Cross-reactivity; Plant antigens
Abstract: Keyhole limpet hemocyanin (KLH)-conjugated peptides are routinely used to raise polyclonal antibodies for biochemical or immunolocalization studies. Rats are suitable for producing antisera against plant antigens as they often lack non-specific response towards plant materials. We attempted to obtain rat antisera against peptides derived from several plant proteins. However, most antisera recognized the same background KLH-related plant antigen (KRAP) in Arabidopsis and tobacco. We characterized KRAP with respect to size and cellular localization and examined possible antigen-specific reasons for the failure of most immunizations. We also found no reports of successful use of rat anti-KLH-peptide antibodies in plant studies. We thus believe that the rat-KLH:peptide system is poorly suited for production of antibodies, especially against plant antigens, and should be used with caution, if at all.
IEB authors: Michal Hála, Martin Potocký, Viktor Žárský