Journal Article

Assignment of the Auxin Binding Abilities of ABP<sub>44</sub> in Gel

Thomas Reinard, Heike Achmus, Antje Walther, Ursula Rescher, Dieter Klambt and Hans-Jorg Jacobsen

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 39, issue 8, pages 874-878
Published in print August 1998 | ISSN: 0032-0781
Published online August 1998 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/oxfordjournals.pcp.a029447
Assignment of the Auxin Binding Abilities of ABP44 in Gel

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Several approaches were successfully performed to directly assign and characterize auxin binding of ABP44 in gel. The 44 kDa high affinity auxin binding protein ABP44 from pea was tested for its ability to bind 5-azido-[7-3H]-IAA in photoaffinity labeling experiments. Competition experiments with several auxin analogues confirm data published previously (Reinard and Jacobsen 1995). Critical reflections of the limitations of the method are also discussed. Immunostaining using the antibody D16 (Napier and Venis 1992), which is directed against the putative binding site of ABP1, revealed that ABP44's auxin binding site is at least partially related to the corresponding site of ABP1. Nevertheless, both proteins do not share any further immu-nological relationships. Our results with D16 recommend a careful reconsideration of data published by other authors. Furthermore, a 80 kDa, dimeric glutathione dependent formaldehyde dehydrogenase (FDH) from mung bean, described recently, was found to be different from ABP44. In contrast to the described FDH, ABP44 exhibited no FDH activity.

Keywords: Auxin binding protein; Formaldehyde dehydrogenase; Photoaffinity labeling; Pisum sativum

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Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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