The Experts below are selected from a list of 249 Experts worldwide ranked by ideXlab platform
Johannes Hanson - One of the best experts on this subject based on the ideXlab platform.
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Sucrose metabolite and signaling molecule
Phytochemistry, 2010Co-Authors: Julia Wind, Sjef Smeekens, Johannes HansonAbstract:Sucrose is a molecule that is synthesized only by oxygenic photosynthetic organisms. In plants, Sucrose is synthesized in source tissues and then can be transported to sink tissues, where it is utilized or stored. Interestingly, Sucrose is both a metabolite and a signaling molecule. Manipulating the rate of the synthesis, transport or degradation of Sucrose affects plant growth, development and physiology. Altered Sucrose levels changes the quantity of Sucrose derived metabolites and Sucrose-specific signaling. In this paper, these changes are summarized. Better understanding of Sucrose metabolism and Sucrose sensing systems in plants will lead to opportunities to adapt plant metabolism and growth.
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Sucrose: Metabolite and signaling molecule
Phytochemistry, 2010Co-Authors: Julia Wind, Sjef Smeekens, Johannes HansonAbstract:Sucrose is a molecule that is synthesized only by oxygenic photosynthetic organisms. In plants, Sucrose is synthesized in source tissues and then can be transported to sink tissues, where it is utilized or stored. Interestingly, Sucrose is both a metabolite and a signaling molecule. Manipulating the rate of the synthesis, transport or degradation of Sucrose affects plant growth, development and physiology. Altered Sucrose levels changes the quantity of Sucrose derived metabolites and Sucrose-specific signaling. In this paper, these changes are summarized. Better understanding of Sucrose metabolism and Sucrose sensing systems in plants will lead to opportunities to adapt plant metabolism and growth. © 2010 Elsevier Ltd. All rights reserved.
Julia Wind - One of the best experts on this subject based on the ideXlab platform.
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Sucrose metabolite and signaling molecule
Phytochemistry, 2010Co-Authors: Julia Wind, Sjef Smeekens, Johannes HansonAbstract:Sucrose is a molecule that is synthesized only by oxygenic photosynthetic organisms. In plants, Sucrose is synthesized in source tissues and then can be transported to sink tissues, where it is utilized or stored. Interestingly, Sucrose is both a metabolite and a signaling molecule. Manipulating the rate of the synthesis, transport or degradation of Sucrose affects plant growth, development and physiology. Altered Sucrose levels changes the quantity of Sucrose derived metabolites and Sucrose-specific signaling. In this paper, these changes are summarized. Better understanding of Sucrose metabolism and Sucrose sensing systems in plants will lead to opportunities to adapt plant metabolism and growth.
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Sucrose: Metabolite and signaling molecule
Phytochemistry, 2010Co-Authors: Julia Wind, Sjef Smeekens, Johannes HansonAbstract:Sucrose is a molecule that is synthesized only by oxygenic photosynthetic organisms. In plants, Sucrose is synthesized in source tissues and then can be transported to sink tissues, where it is utilized or stored. Interestingly, Sucrose is both a metabolite and a signaling molecule. Manipulating the rate of the synthesis, transport or degradation of Sucrose affects plant growth, development and physiology. Altered Sucrose levels changes the quantity of Sucrose derived metabolites and Sucrose-specific signaling. In this paper, these changes are summarized. Better understanding of Sucrose metabolism and Sucrose sensing systems in plants will lead to opportunities to adapt plant metabolism and growth. © 2010 Elsevier Ltd. All rights reserved.
Sjef Smeekens - One of the best experts on this subject based on the ideXlab platform.
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Sucrose metabolite and signaling molecule
Phytochemistry, 2010Co-Authors: Julia Wind, Sjef Smeekens, Johannes HansonAbstract:Sucrose is a molecule that is synthesized only by oxygenic photosynthetic organisms. In plants, Sucrose is synthesized in source tissues and then can be transported to sink tissues, where it is utilized or stored. Interestingly, Sucrose is both a metabolite and a signaling molecule. Manipulating the rate of the synthesis, transport or degradation of Sucrose affects plant growth, development and physiology. Altered Sucrose levels changes the quantity of Sucrose derived metabolites and Sucrose-specific signaling. In this paper, these changes are summarized. Better understanding of Sucrose metabolism and Sucrose sensing systems in plants will lead to opportunities to adapt plant metabolism and growth.
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Sucrose: Metabolite and signaling molecule
Phytochemistry, 2010Co-Authors: Julia Wind, Sjef Smeekens, Johannes HansonAbstract:Sucrose is a molecule that is synthesized only by oxygenic photosynthetic organisms. In plants, Sucrose is synthesized in source tissues and then can be transported to sink tissues, where it is utilized or stored. Interestingly, Sucrose is both a metabolite and a signaling molecule. Manipulating the rate of the synthesis, transport or degradation of Sucrose affects plant growth, development and physiology. Altered Sucrose levels changes the quantity of Sucrose derived metabolites and Sucrose-specific signaling. In this paper, these changes are summarized. Better understanding of Sucrose metabolism and Sucrose sensing systems in plants will lead to opportunities to adapt plant metabolism and growth. © 2010 Elsevier Ltd. All rights reserved.
I David Schwartz - One of the best experts on this subject based on the ideXlab platform.
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Congenital sucrase-isomaltase deficiency presenting with failure to thrive, hypercalcemia, and nephrocalcinosis
BMC Pediatrics, 2002Co-Authors: John W Belmont, Barbara Reid, William Taylor, Susan S Baker, Warren H Moore, Michael C Morriss, Susan M Podrebarac, Nancy Glass, I David SchwartzAbstract:Background Disaccharide Intolerance Type I (Mendelian Interance in Man database: *222900) is a rare inborn error of metabolism resulting from mutation in sucrase-isomaltase (Enzyme Catalyzed 3.2.1.48). Usually, infants with SI deficiency come to attention because of chronic diarrhea and nutritional evidence of malabsorption. Case Presentation We describe an atypical presentation of this disorder in a 10-month-old infant. In addition to chronic diarrhea, the child displayed severe and chronic hypercalcemia, the evaluation of which was negative. An apparently coincidental right orbital hemangioma was detected. Following identification of the SI deficiency, an appropriately Sucrose-restricted, but normal calcium diet regimen was instituted which led to cessation of diarrhea, substantial weight gain, and resolution of hypercalcemia. Conclusions This case illustrates that, similar to congenital lactase deficiency (Mendelian Interance in Man database: *223000, Alactasia, Hereditary Disaccharide Intolerance Type II), hypercalcemia may complicate neonatal Sucrase-Isomaltase deficiency. Hypercalcemia in the presence of chronic diarrhea should suggest disaccharide intolerance in young infants.
Steven C. Huber - One of the best experts on this subject based on the ideXlab platform.
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Sucrose Phosphate Synthase and Sucrose Accumulation at Low Temperature
Plant Physiology, 1992Co-Authors: Joan L. Huber, Steven C. HuberAbstract:The influence of growth temperature on the free sugar and Sucrose phosphate synthase content and activity of spinach (Spinacia oleracea) leaf tissue was studied. When plants were grown at 25°C for 3 weeks and then transferred to a constant 5°C, Sucrose, glucose, and fructose accumulated to high levels during a 14-d period. Predawn sugar levels increased from 14- to 20-fold over the levels present at the outset of the low-temperature treatment. Sucrose was the most abundant free sugar before, during, and after exposure to 5°C. Leaf Sucrose phosphate synthase activity was significantly increased by the low-temperature treatment, whereas Sucrose synthase and invertases were not. Synthesis of the Sucrose phosphate synthase subunit was increased during and after low-temperature exposure and paralleled an increase in the steady-state level of the subunit. The increases in Sucrose and its primary biosynthetic enzyme, Sucrose phosphate synthase, are discussed in relation to adjustment of metabolism to low nonfreezing temperature and freezing stress tolerance.
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Sucrose phosphate synthase and other Sucrose metabolizing enzymes in fruits of various species.
Physiologia Plantarum, 1991Co-Authors: Natalie L. Hubbard, D. Mason Pharr, Steven C. HuberAbstract:Recent reports have suggested that Sucrose phosphate synthase (EC 2.4.1.14), a key enzyme in Sucrose biosynthesis in photosynthetic “source” tissues, may also be important in some Sucrose accumulating “sink” tissues. These experiments were conducted to determine if Sucrose phosphate synthase is involved in Sucrose accumulation in fruits of several species. Peach (Prunus persica NCT 516) and strawberry (Fragaria x ananassa cv. Chandler) fruits were harvested directly from the plant at various stages of fruit development. Kiwi (Actinidia chinensis), papaya (Carica papaya), pineapple (Ananas comosus) and mango (Mangifera indica) were sampled in postharvest storage over a period of several days. Carbohydrate concentrations and activities of Sucrose phosphate synthase, Sucrose synthase (EC 2.4.1.13), and acid and neutral invertases (EC 3.2.1.26) were measured. All fruits contained significant activities of Sucrose phosphate synthase. Moreover, in fruits from all species except pineapple and papaya, there was an increase in Sucrose phosphate synthase activity associated with the accumulation of Sucrose in situ. The increase in Sucrose concentration in peaches was also associated with an increase in Sucrose synthase activity and, in strawberries, with increased activity of both Sucrose synthase and neutral invertase. The hexose pools in all fruits were comprised of equimolar concentrations of fructose and glucose, except in the mango. In mango, the fructose to glucose ratio increased from 2 to 41 during ripening as Sucrose concentration more than doubled. The results of this study indicate that activities of the Sucrose metabolizing enzymes, including Sucrose phosphate synthase, within the fruit itself, are important in determining the soluble sugar content of fruits of many species. This appears to be true for fruits which sweeten from a starch reserve and in fruits from sorbitol translocating species, raffinose saccharide translocating species, and Sucrose translocating species.
