Practice question
Question
Sucrose-phosphate synthase (SPS) is a key enzyme in the biosynthesis of sucrose in plants. Following are certain statements regarding SPS: A. Uridine-diphosphate glucose and fructose-6-phosphate are the substrates for SPS. B. SPS directly converts its substrate into sucrose. C. Phosphorylation activates while dephosphorylation inactivates SPS. D. SPS converts its substrate into sucrose-6-phosphate which is then converted to sucrose by the action of sucrose-phosphate phosphatase. E. Glucose 6-phosphate activates while Pi inactivates SPS. Which one of the following options represents the combination of all correct statements?
Explanation
SPS converts UDP-glucose + fructose-6-phosphate to sucrose-6-phosphate, then SPP dephosphorylates to sucrose. Activated by glucose-6-phosphate, inhibited by Pi. Direct sucrose synthesis and phosphorylation activation are false, so A, D, E correct.
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