Abstract
Thioredoxin (Td) f from pea (Pisum sativum L.) leaves was purified by a simple method, which provided a high yield of homogeneous Td f. Purified Td f had an isoelectric point of 5.4 and a relative molecular mass (Mr) of 12 kilodaltons (kDa) when determined by filtration through Superose 12, but an Mr of 15.8 kDa when determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The purified protein remained fully active for several months when conserved frozen at — 20° C. The pea protein was able to activate fructose1,6-bisphosphatase (FBPase; EC 3.1.3.11), but in contrast to other higher-plant Td f proteins, was not functional in the modulation of NADP+-malate dehydrogenase activity. In spite of the absence of immunological cross-reactions of pea and spinach Td f proteins with the corresponding antibodies, pea Td f activated not only the homologous FBPase, but also the spinach enzyme. The saturation curves for pea FBPase, either with fructose-1,6-bisphosphate in the presence of different concentrations of homologous Td f, or with pea Td f in the presence of excess substrate, showed sigmoid kinetics; this can be explained on the basis of a random distribution of fructose-1,6-bisphosphate, and of the oxidized and reduced forms of the activator, among the four Td f- and substrate-binding sites of this tetrameric enzyme. From the saturation curves of pea and spinach Td f proteins against pea FBPase, a 4:1 stoichiometry was determined for the Td f-enzyme binding. This is in contrast to the 2:1 stoichiometry found for the spinach FBPase. The UV spectrum of pea Td f had a maximum at 277 nm, which shifted to 281 nm after reduction with dithiothreitol (s at 280 nm for 15.8-kDa Mr = 6324 M−1 · cm−1). The fluorescence emission spectrum after 280-nm excitation had a maximum at 334 nm, related to tyrosine residues; after denaturation with guanidine isothiocyanate an additional maximum appeared at 350 nm, which is concerned with tryptophan groups. Neither the native nor the denatured form showed a significant increase in fluorescence after reduction by dithiothreitol, which means that the tyrosine and tryptophan groups in the reduced Td f are similarly exposed. Pea Td f appears to have one cysteine residue more than the three cysteines earlier described for spinach and Scenedesmus Td f proteins.
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Abbreviations
- DDT:
-
dithiothreitol
- ELISA:
-
enzyme-linked immunosorbent assay
- FBPase:
-
fructose- 1,6-bisphosphatase
- kDa:
-
kilodalton
- Mr :
-
relative molecular mass
- SDS-PAGE:
-
sodium dodecyl sulfate-polyacrylamide gel electrophoresis
- Td:
-
thioredoxin
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The authors are grateful to Mrs. Francisca Castro and Mr. Narciso Algaba for skilful technical assistance. This work was supported by grant PB87-0431 of Dirección General de Investigación Cientifica y Técnica (DGICYT, Spain).
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Prado, F.E., Lázaro, J.J., Hermoso, R. et al. Purification and properties of pea (Pisum sativum L.) thioredoxin f, a plant thioredoxin with unique features in the activation of chloroplast fructose-1,6-bisphosphatase. Planta 188, 345–353 (1992). https://doi.org/10.1007/BF00192801
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DOI: https://doi.org/10.1007/BF00192801