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Identification of auxin-binding proteins using an improved assay for photoaffinity labeling with 5-N3-[7-3 H]-indole-3-acetic acid
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We have developed an improved assay for detection of auxin-binding proteins using photoaffinity labeling. We have synthesized 5-NH2-[7-3H]indole-3-acetic acid (IAA) and 5-N3-[7-3H]IAA and extensively purified these compounds. Photoaffinity labeling of auxin binding proteins was performed at -196°C to reduce unspecific labeling of plant proteins. The method presented here has several advantages compared to previously described approaches. (1) Modification of the photoaffinity labeling conditions results in a significant increase in specificity of the assay; (2) the assay is simple and reliable; (3) the assay is fast and easily allows processing of a large number of samples. The application of this assay is demonstrated using a well known auxin-binding protein from maize coleoptiles, ABP-1. We show that ABP-1 is efficiently and specifically labeled after illumination in the presence of 5-N3-(7-3H]IAA. In addition, we demonstrate that photoaffinity labeling with 5-N3-[7-3H]IAA is specificallycompeted in the presence of an active auxin analogue. We conclude that the assay described should contribute to the identification of novel auxin-binding proteins.
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CAMPOS MARTÍNEZ, Narciso, et al. Identification of auxin-binding proteins using an improved assay for photoaffinity labeling with 5-N3-[7-3 H]-indole-3-acetic acid. Technique. 1991. Vol. 3, num. 2, pags. 69-75. ISSN 1043-4658. [consulted: 23 of May of 2026]. Available at: https://hdl.handle.net/2445/225954