Sucrose metabolism plays pivotal roles in development, stress response, and yield formation, mainly by generating a range of sugars as metabolites to fuel growth and synthesize essential compounds (including protein, cellulose, and starch) and as signals to regulate expression of microRNAs, transcri …

2004年6月1日 · Depending on the path of sucrose entry into an importing structure (i.e. via plasmodesmata or across the cell wall space), sucrose can be cleaved by cell wall invertase (CWIN), cytoplasmic invertase (CIN), sucrose synthase (SUS), or vacuolar invertase (VIN).

2024年3月15日 · During the transportation of the apoplastic pathway, sucrose is hydrolyzed by cell wall invertase into hexose and hexose enters the cytoplasm. On the other hand, sucrose enters the cytoplasm (via sucrose transporters) through the symplastic pathway. Sucrose is either cleaved or stored in the vacuole.

The role of various enzymes involved in sucrose breakdown and sucrose resynthesis such as sucrose synthase, neutral and acid invertases within the so-called “sucrose cycle”, sucrose translocation within and between organs, as well as its associated metabolism in grape pericarp during ripening, were described thoroughly in the light of a ...

2019年5月30日 · Once released from starch or once ingested, sucrose can be degraded into beta-D-fructose and alpha-D-glucose via lysosomal alpha-glucosidase or sucrose-isomaltase. Beta-D-fructose can be converted to beta-D-fructose-6-phosphate by glucokinase and then to alpha-D-glucose-6-phosphate by the action of glucose phosphate isomerase.

2012年1月13日 · Sucrose is synthesized in leaf mesophyll cells and diffuses through plasmodesmata into phloem parenchyma cells. SWEET proteins facilitate sucrose efflux into the cell wall (apoplast). Sucrose transporters import sucrose into …

The pathway for sucrose biosynthesis involves the sequential action of sucrose-phosphate synthase (SPS, EC 2.4.1.14) and sucrose-phosphate phosphatase (SPP, EC 3.1.3.24) yielding free sucrose and inorganic phosphate (Pi) [8]. The hydrolysis of the intermediate, sucrose-6P, leads to an essentially irreversible synthesis pathway that provides an ...

2019年5月30日 · The metabolism of starch and sucrose begins with D-fructose interacting with a D-glucose in a reversible reaction through a maltodextrin glucosidase resulting in a water molecule and a sucrose. D-fructose is phosphorylated through an ATP driven fructokinase resulting in the release of an ADP, a hydrogen ion and a Beta-D-fructofuranose 6-phosphate.

2019年1月17日 · General Background SUCROSE is an important disaccharide in plants and plays a major role in moving carbon through the plant via the phloem from "source" tissues such as photosynthesizing leaves to "sink" tissues such as roots [PMID: 23393426]. In the light, triose phosphate, the product of photosynthetic carbon fixation, is transported from the ...

Sucrose cleavage is vital to multicellular plants, not only for the allocation of crucial carbon resources but also for the initiation of hexose-based sugar signals in importing structures. Only the invertase and reversible sucrose synthase reactions catalyze known paths of sucrose breakdown in vivo …