Novel thioredoxin targets in Dictyostelium discoideum identified by two-hybrid analysis: interactions of thioredoxin with elongation factor 1α and yeast alcohol dehydrogenase
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Thomas Brodegger
Abstract
Thioredoxins (Trx) are ubiquitous dicysteine proteins capable of modulating enzymes and other cellular targets through specific disulfide-dithiol redox changes. They are unique in that a large number of very diverse metabolic systems are addressed and redox-regulated in bacteria, animal, and plant cells, but the finite number of thioredoxin interaction partners is still unknown. Two-hybrid methodology should provide a rational way to establish thioredoxin functions in a given organism. We report a search for physiological target proteins of thioredoxin1 in the social amoeba Dictyostelium discoideum, which possesses three developmentally regulated thioredoxin genes, all of which lack functional characterisation. A two-hybrid approach identified at least seven bona fide thioredoxin partners, including oxidoreductases, proteins of the ribosomal translation apparatus, and the cytoskeletal protein filopodin. With the exception of ribonucleotide reductase, none of these systems had previously been linked to specific redox modulation. Molecular interactions in two of the new thioredoxin/target protein couples were verified by biochemical studies: (1) thioredoxin1 and the abundant elongation factor 1α from D. discoideum form the mixed heterodisulfide characteristic of the thioredoxin mechanism of action; and (2) reduced thioredoxin, but not glutathione, strongly inhibits yeast alcohol dehydrogenase catalysis of ethanol oxidation.
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©2004 by Walter de Gruyter Berlin New York
Articles in the same Issue
- Structural flexibility of small GTPases. Can it explain their functional versatility?
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- Structural characterization of extracellular lipase from Streptomyces rimosus: assignment of disulfide bridge pattern by mass spectrometry
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- Novel thioredoxin targets in Dictyostelium discoideum identified by two-hybrid analysis: interactions of thioredoxin with elongation factor 1α and yeast alcohol dehydrogenase
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- Content Index
- Author Index
- Subject Index
Articles in the same Issue
- Structural flexibility of small GTPases. Can it explain their functional versatility?
- Neuroendocrine regulation of salivary IgA synthesis and secretion: implications for oral health
- Structural characterization of extracellular lipase from Streptomyces rimosus: assignment of disulfide bridge pattern by mass spectrometry
- Thermal unfolding of ribonuclease T1 studied by multi-dimensional NMR spectroscopy
- Conserved asparagine residue 54 of α-sarcin plays a role in protein stability and enzyme activity
- Replacement of the interchain disulfide bridge-forming amino acids A7 and B7 by glutamate impairs the structure and activity of insulin
- Stereospecificity of horseradish peroxidase
- Novel thioredoxin targets in Dictyostelium discoideum identified by two-hybrid analysis: interactions of thioredoxin with elongation factor 1α and yeast alcohol dehydrogenase
- Functional characterization of the postulated intramolecular sphingolipid activator protein domain of human acid sphingomyelinase
- St. John's wort (Hypericum perforatum) counteracts cytokine-induced tryptophan catabolism in vitro
- Nuclear fibroblast growth factor-2 interacts specifically with splicing factor SF3a66
- Content Index
- Author Index
- Subject Index