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The unloading of the assimilates (eg. sucrose) occurs at the sinks. Scientists believe that the unloading of sucrose is similar to the loading of sucrose, with the sucrose being actively transported out of the companion cells and then moving out of the phloem tissue via apoplastic or symplastic pathways. To maintain a concentration gradient in ...
The synthesis of sucrose and starch occurs in different cellular compartments (cytosol and plastids, respectively), and these processes are coordinated by a variety of regulatory mechanisms that respond to changes in light level and photosynthetic rate.
7 Φεβ 2019 · Sucrose synthase (SuSy) is a glycosyl transferase enzyme that plays a key role in sugar metabolism, primarily in sink tissues. SuSy catalyzes the reversible cleavage of sucrose into fructose and either uridine diphosphate glucose (UDP-G) or adenosine diphosphate glucose (ADP-G).
Sucrose synthase (SuS) is a key enzyme in the regulation of sucrose metabolism in plants and participates in the reversible reaction of sucrose conversion to uridine diphosphate-glucose and fructose. It plays an important role in promoting taproot development, starch synthesis, cellulose synthesis, improving plant nitrogen fixation capacity ...
1 Ιαν 1980 · The unique property of sucrose synthase is that not only UDP-glucose but also ADP-glucose, TDP-glucose, dTDP-glucose, CDP-glucose, and GDP-glucose act as the glucosyl donor in the transglucosylation reaction. However, the affinity of the enzyme toward UDP-glucose is invariably reported to be much greater than that toward other glucose nucleotides.
1 Απρ 2002 · The equilibrium constant of the SuSy reaction is unfavorable for accumulation of high concentrations of Suc, but if the Suc were being transported out of the vegetative cells into the heterocysts then SuSy could catalyze its net synthesis.
1 Ιουν 2004 · Cytoplasmic sucrose cleavage typically produces limited hexoses or hexose-based sugar signals because of the generally low activity of CIN and the production of UDPG instead of glucose by SUS. In contrast, sucrose that enters sinks via the cell wall space can generate significant amounts of glucose and other hexoses if CWIN is active.
