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Sugar transformations associated with hexose transport in immature internodal tissue of sugar cane



Sugar transformations associated with hexose transport in immature internodal tissue of sugar cane



Phytochemistry 13(9): 1639-1644



After a 15 sec incubation in d-glucose-14C(U), 53-70% of the intracellular radioactivity in immature internodal tissue of sugarcane was in glucose-6-phosphate, and the remainder was in free glucose. Two unmetabolized glucose analogs, 2-deoxy-d-glucosce and 3-O-methyl-d-glucose, were transported at rates comparable to glucose but neither of these analogs was phosphorylated. Doubly-labeled d-glucose-1-14C-6-phosphate-32P was dephosphorylated prior to deposition in the inner space, and 14C was transported into this tissue twice as rapidly as 32P. It was also shown that 32P in exogenously supplied glucose-6-32P was not the source of phosphate for the intracellular synthesis of glucose-6-P. Galactose transport was similar to that of glucose in that the first major product recovered intracellularly was a phosphorylated sugar, i.e. 14C-galactose-1-P, when the tissue was incubated in d-galactose-14C(U). Although fructose, glucose, and galactose competed for transport into this tissue, free fructose and glucose predominated in the tissue extract after a 15-sce incubation in d-fructose-14C(U). This contrasted sharply, with the products of 14C-glucose transport which were comprised of phosphorylated sugars after 15 sec.

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Accession: 004504175

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DOI: 10.1016/0031-9422(74)85066-1


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