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Literature summary for 2.4.1.123 extracted from
- Important roles of drought- and cold-inducible genes for galactinol synthase in stress tolerance in Arabidopsis thaliana (2002), Plant J., 29, 417-426.
Activating Compound
| Activating Compound | Comment | Organism | Structure |
|---|---|---|---|
| additional information | AtGolS1 and 2 expression are induced by drought and high-salinity stresses and weakly induced by abscisic acid, but not by cold stress | Arabidopsis thaliana | |
| additional information | AtGolS3 is induced by cold stress, but not by drought or salt stress or by abscisic acid | Arabidopsis thaliana |
Cloned(Commentary)
| Cloned (Comment) | Organism |
|---|---|
| 7 AtGolS genes, cloning of AtGolS1, 2 and 3, AtGolS1 and 2 are induced by drought and high-salinity stresses, but not by cold stress, AtGolS3 is induced by cold stress, but not by drought or salt stress, overexpression of glutathione S-transferase fusion proteins GTS-AtGolS1, 2 and 3 in Escherichia coli, overexpression of AtGolS2 in transgenic Arabidopsis improves drought tolerance, AtGolS3 is controlled by the transcription factor DREB1A | Arabidopsis thaliana |
Natural Substrates/ Products (Substrates)
| Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| UDP-galactose + myo-inositol | Arabidopsis thaliana | catalyzes the first step in the biosynthesis of raffinose family oligosaccharides, raffinose and galactinol are involved in tolerance to drought, high salinity and cold stress and may function as osmoprotectants in drought-stress tolerance, stress inducible enzyme plays a key role in the accumulation of galactinol and raffinose under abiotic stress conditions | UDP + 1-O-alpha-D-galactosyl-D-myo-inositol | - |
? |  |
Organism
| Organism | UniProt | Comment | Textmining |
|---|---|---|---|
| Arabidopsis thaliana | O22893 | ecotype Columbia, isoenzyme AtGolS1 | - |
| Arabidopsis thaliana | O80518 | ecotype Columbia, isoenzyme AtGolS3 | - |
| Arabidopsis thaliana | Q9FXB2 | ecotype Columbia, isoenzyme AtGolS2 | - |
Posttranslational Modification
| Posttranslational Modification | Comment | Organism |
|---|---|---|
| no modification | no putative serine phosphorylation site | Arabidopsis thaliana |
| phosphoprotein | AtGolS1 protein has a putative serine phosphorylation site at position 270 | Arabidopsis thaliana |
Purification (Commentary)
| Purification (Comment) | Organism |
|---|---|
| purification of glutathione S-transferase fusion proteins GTS-AtGolS1, 2 and 3, overexpressed in Escherichia coli | Arabidopsis thaliana |
Source Tissue
| Source Tissue | Comment | Organism | Textmining |
|---|---|---|---|
| seed | high level of AtGolS1 and 2 expression in mature seeds, but very low of AtGolS3 | Arabidopsis thaliana | - |
Substrates and Products (Substrate)
| Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| UDP-galactose + myo-inositol | - |
Arabidopsis thaliana | UDP + 1-O-alpha-D-galactosyl-D-myo-inositol | identical with galactinol | ? | |
| UDP-galactose + myo-inositol | catalyzes the first step in the biosynthesis of raffinose family oligosaccharides, raffinose and galactinol are involved in tolerance to drought, high salinity and cold stress and may function as osmoprotectants in drought-stress tolerance, stress inducible enzyme plays a key role in the accumulation of galactinol and raffinose under abiotic stress conditions | Arabidopsis thaliana | UDP + 1-O-alpha-D-galactosyl-D-myo-inositol | - |
? | |
Temperature Optimum [°C]
| Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
|---|---|---|---|
| 30 | - |
assay at | Arabidopsis thaliana |
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