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. 1972 Oct;50(4):507–509. doi: 10.1104/pp.50.4.507

The Binding of Indole-3-acetic Acid and 3-Methyleneoxindole to Plant Macromolecules

P S Basu a, V Tuli a
PMCID: PMC366179  PMID: 16658206

Abstract

Homogenates of pea (Pisum sativum L., var. Alaska) seedlings exposed to 14C-indole-3-acetic acid or 14C-3-methyleneoxindole, an oxidation product of indole-3-acetic acid, were extracted with phenol. In both cases 90% of the bound radioactivity was found associated with the protein fraction and 10% with the water-soluble, ethanol-insoluble fraction. The binding of radioactivity from 14C-indole-3-acetic acid is greatly reduced by the addition of unlabeled 3-methyleneoxindole as well as by chlorogenic acid, an inhibitor of the oxidation of indole-3-acetic acid to 3-methyleneoxindole. Chlorogenic acid does not inhibit the binding of 14C-3-methyleneoxindole. The labeled protein and water-soluble, ethanol-insoluble fractions of the phenol extract were treated with an excess of 2-mercaptoethanol. Independently of whether the seedlings had been exposed to 14C-indole-3-acetic acid or 14C-3-methyleneoxindole, the radioactivity was recovered from both fractions in the form of a 2-mercaptoethanol-3-methyleneoxindole adduct. These findings indicate that 3-methyleneoxindole is an intermediate in the binding of indole-3-acetic acid to macromolecules.

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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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