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. 1977 Mar;59(3):357–364. doi: 10.1104/pp.59.3.357

Characterization of Naphthaleneacetic Acid Binding to Receptor Sites on Cellular Membranes of Maize Coleoptile Tissue 1

Peter M Ray a, Ulrike Dohrmann a, Rainer Hertel b
PMCID: PMC542402  PMID: 16659851

Abstract

Characteristics of and optimum conditions for saturable (“specific”) binding of [14C]naphthaleneacetic acid to sites located on membranous particles from maize (Zea mays L.) coleoptiles are described. Most, if not all, of the specific binding appears to be due to a single kinetic class of binding sites having a KD of 5 to 7 × 10−7m for naphthalene-1-acetic acid (NAA). Binding of NAA is insensitive to high monovalent salt concentrations, indicating that binding is not primarily ionic. However, specific binding is inhibited by Mg2+ or Ca2+ above 5 mm. Specific binding is improved by organic acids, especially citrate. Binding is heat-labile and is sensitive to agents that act either on proteins or on lipids. Specific binding is reversibly inactivated by reducing agents such as dithioerythritol; a reducible group, possibly a disulfide group, may be located at the binding site and required for its function. The affinity of the specific binding sites for auxins is modified by an unidentified dialyzable, heat-stable, apparently amphoteric, organic factor (“supernatant factor”) found in maize tissue.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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