Summary
The determination of the activities of the enzymes which could be involved in the starch-sucrose conversion showed that the first step of this transfer is a phosphorolysis of starch. Both phosphorylases are able to attack the starch granules. The glu-l-P thus formed can be further metabolized to UDPG and fru-6-P, which are the substrates for the reaction catalysed by the sucrose-6-phosphate-synthetase. The activity of this enzyme increases about 4-fold during the period from immaturity to the first day of germination. The synthesis of sucrose-6-phosphate is inhibited by sucrose. This inhibition (causing an UDPG accumulation) provides a control for further starch breakdown.
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de Fekete, M.A.R. Zum Stoffwechsel der Stärke. Planta 87, 324–332 (1969). https://doi.org/10.1007/BF00388317
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DOI: https://doi.org/10.1007/BF00388317