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• W2149884924 abstract "Isomaltulose is a structural isomer of sucrose (Suc). It has been widely used as a nonmetabolized sugar in physiological studies aimed at better understanding the regulatory roles and transport of sugars in plants. It is increasingly used as a nutritional human food, with some beneficial properties including low glycemic index and acariogenicity. Cloning of genes for Suc isomerases opened the way for direct commercial production in plants. The understanding that plants lack catabolic capabilities for isomaltulose indicated a possibility of enhanced yields relative to Suc. However, this understanding was based primarily on the treatment of intact cells with exogenous isomaltulose. Here, we show that sugarcane (Saccharum interspecific hybrids), like other tested plants, does not readily import or catabolize extracellular isomaltulose. However, among intracellular enzymes, cytosolic Suc synthase (in the breakage direction) and vacuolar soluble acid invertase (SAI) substantially catabolize isomaltulose. From kinetic studies, the specificity constant of SAI for isomaltulose is about 10% of that for Suc. Activity varied against other Suc isomers, with V(max) for leucrose about 6-fold that for Suc. SAI activities from other plant species varied substantially in substrate specificity against Suc and its isomers. Therefore, in physiological studies, the blanket notion of Suc isomers including isomaltulose as nonmetabolized sugars must be discarded. For example, lysis of a few cells may result in the substantial hydrolysis of exogenous isomaltulose, with profound downstream signal effects. In plant biotechnology, different V(max) and V(max)/K(m) ratios for Suc isomers may yet be exploited, in combination with appropriate developmental expression and compartmentation, for enhanced sugar yields." @default.
• W2149884924 created "2016-06-24" @default.
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• W2149884924 date "2011-10-18" @default.
• W2149884924 modified "2023-09-23" @default.
• W2149884924 title "Isomaltulose Is Actively Metabolized in Plant Cells" @default.
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• W2149884924 doi "https://doi.org/10.1104/pp.111.189001" @default.
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