Modulation of soluble auxin-binding proteins in soybean cell suspensions |
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Authors: | Birgit Herber Bernhard Ulbrich Hans-Jörg Jacobsen |
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Institution: | (1) Institut für Genetik, Universität Bonn, Kirschallee 1, D-5300 Bonn 1, Federal Republic of Germany;(2) Nattermann Research Laboratories, Postfach 3501 20, D-5000 Köln 30, Federal Republic of Germany |
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Abstract: | Rapidly growing cell suspensions of soybean were analyzed for the presence of cytoplasmic high-affinity binding sites for auxin. Cytosol preparations were studied in lag, log and early stationary phase of the growth cycle. Two binding sites were detected, which show some similarities with binding sites previously reported from etiolated pea epicotyls. While the number of both sites declined in the cytoplasm during the growth cycle, the number of one of the two sites increased at the onset of rapid cell divisions. In parallel, both sites exhibited an increase in binding affinity during the growth cycle. The data will be discussed in relation to other reports on soluble auxin binding as well as to possible physiological functions.Abbreviations CF
Chromatofocusing
- TCA
trichloroacetic acid
- sABP
soluble auxin-binding protein
- DIECA
diethyldithiocarbamate
- PEI
polyethylen-imine (filter assay for ligand binding)
- ASP
ammonium sulphate precipitation assay
- RT
number of binding sites
- KD
dissociation constant
- TSBS/DMSDP
TRIS (0.1M)-sucrose(35%)-bromophenol blue (0.01%)-SDS-dithiothreitol-2-mercapto enthanol-SDS-DMSO-PMSF |
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Keywords: | |
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