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Literature summary for 2.4.1.99 extracted from

  • Verspreet, J.; Cimini, S.; Vergauwen, R.; Dornez, E.; Locato, V.; Le Roy, K.; De Gara, L.; Van den Ende, W.; Delcour, J.A.; Courtin, C.M.
    Fructan metabolism in developing wheat (Triticum aestivum L.) kernels (2013), Plant Cell Physiol., 54, 2047-2057.
    View publication on PubMed
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Natural Substrates/ Products (Substrates)

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

Organism UniProt Comment Textmining
Triticum aestivum
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Triticum aestivum Q8W430 var. Homeros
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Source Tissue

Source Tissue Comment Organism Textmining
kernel
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 Triticum aestivum
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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
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Substrates and Products (Substrate)

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

Synonyms Comment Organism
1-SST
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 Triticum aestivum
sucrose:sucrose 1-fructosyltransferase
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 Triticum aestivum

General Information

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