Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
additional information | Triticum aestivum | the main 1-SST-catalyzed reaction is the formation of 1-kestotriose and glucose from two sucrose molecules. During incubation with 6G-kestotriose and sucrose, the enzyme is again able to form 1-kestotriose from sucrose. 1+6G-kestotetraose is formed during incubation with 6G-kestotriose and sucrose, also cf. EC 2.4.1.243 | ? | - |
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Organism | UniProt | Comment | Textmining |
---|---|---|---|
Triticum aestivum | - |
- |
- |
Triticum aestivum | Q8W430 | var. Homeros | - |
Source Tissue | Comment | Organism | Textmining |
---|---|---|---|
kernel | - |
Triticum aestivum | - |
kernel | developing from anthesis until maturity. When sucrose is the sole substrate, 1-kestotriose formation is highest during the first 9 days after anthesis, as well as 1-SST activity for 1-kestotriose formation from sucrose and 6G-kestotriose, after which the latter activity suddenly decreases. Little 1-kestotriose formation is seen in wheat kernels harvested between 9 and 28 days after anthesis whereas no such activity is observed later on during kernel development. 1+6G-kestotetraose formation follows a similar pattern to 1-kestotriose synthesis throughout kernel development although the formed 1+6G-kestotetraose levels are always lower | Triticum aestivum | - |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
additional information | the main 1-SST-catalyzed reaction is the formation of 1-kestotriose and glucose from two sucrose molecules. During incubation with 6G-kestotriose and sucrose, the enzyme is again able to form 1-kestotriose from sucrose. 1+6G-kestotetraose is formed during incubation with 6G-kestotriose and sucrose, also cf. EC 2.4.1.243 | Triticum aestivum | ? | - |
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Synonyms | Comment | Organism |
---|---|---|
1-SST | - |
Triticum aestivum |
sucrose:sucrose 1-fructosyltransferase | - |
Triticum aestivum |
General Information | Comment | Organism |
---|---|---|
physiological function | fructan accumulation occurs mainly in the first 2 weeks after anthesis, and a maximal fructan concentration of 2.5 mg fructan per kernel is reached at 16 days after anthesis. Fructan synthesis is catalyzed by 1-SST (sucrose:sucrose 1-fructosyltransferase) and 6-SFT (sucrose:fructan 6-fructosyltransferase), and to a lesser extent by 1-FFT (fructan:fructan 1-fructosyltransferase). Despite the presence of 6G-kestotriose in wheat kernel extracts, the measured 6G-FFT (fructan:fructan 6G-fructosyltransferase) activity levels are low | Triticum aestivum |