EC Number   |
General Information |
Reference |
|---|
   2.4.1.67 | malfunction |
metabolite phenotype of DELTAAtRS4 mutant seeds, overview |
-, 736162 |
| 2.4.1.67 | metabolism |
biosynthesis of RFOs proceeds by stepwise transfer of galactosyl units. The second step involves raffinose synthase, AtRS5, EC 2.4.1.82, which transfers the galactosyl unit from galactinol to the C6 position of the glucose unit in sucrose forming an alpha-1,6-galactosidic linkage to yield the trisaccharide raffinose. In a third step, stachyose synthase, AtRS4, EC 2.4.1.67, transfers the galactosyl moiety from galactinol to the C6 position of the galactose unit in raffinose to yield the tetrasaccharide stachyose |
-, 736162 |
| 2.4.1.67 | metabolism |
stachyose biosynthesis |
706231 |
| 2.4.1.67 | metabolism |
the enzyme is responsible for stachyose biosynthesis |
737276 |
| 2.4.1.67 | physiological function |
AtRS4 is the only stachyose synthase in the genome of Arabidopsis thaliana. Stachyose synthase is an important enzyme involved in the biosynthesis of raffinose family oligosaccharides, which occur frequently in higher plants. The enzyme represents a key regulation mechanism in the raffinose family oligosaccharide physiology of Arabidosis thaliana due to its multifunctional enzyme activity. AtRS4 is possibly the second seed-specific raffinose synthase beside AtRS5, which is responsible for raffinose accumulation under abiotic stress |
-, 736162 |
| 2.4.1.67 | physiological function |
STS is involved in phloem loading of cucumber leaves, showing reductions in STS activity and stachyose content along with a small amount of starch accumulation in leaves. After 6°C low temperature stress, malondialdehyde content and electrical conductivity increase, especially in STS-RNAi plants. STS expression is up-regulated, STS activity and stachyose level increase, the activities of reactive-oxygen-scavenging enzyme in cucumber seedlings improve significantly and starch accumulation reduces in STS overexpressing lines |
758027 |
| 2.4.1.67 | physiological function |
the enzyme protects the thylakoid but not the plasma membrane during freezing by stachyose production |
723481 |
