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  • Title: Antibodies to a peptide from the maize auxin-binding protein have auxin agonist activity.
    Author: Venis MA, Napier RM, Barbier-Brygoo H, Maurel C, Perrot-Rechenmann C, Guern J.
    Journal: Proc Natl Acad Sci U S A; 1992 Aug 01; 89(15):7208-12. PubMed ID: 1323130.
    Abstract:
    The major auxin-binding protein in maize membranes is thought to function as a physiological receptor. From earlier information, including the use of site-directed irreversible inhibitors, several of the amino acids likely to form part of the active auxin-binding site were provisionally assigned. Inspection of the amino acid sequence of the auxin-binding protein showed a short region containing all but one of these amino acids. We find that antisera raised against a synthetic peptide encompassing this region recognize all isoforms of the maize auxin-binding protein together with homologous polypeptides in other species. We further find that the antibodies hyperpolarize protoplast transmembrane potential in an auxin-like manner. We conclude that these antibodies display auxin agonist activity and that we have identified an essential portion of the auxin-binding site.
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