Fragments containing three carbons can be transferred from a ketose phosphate to an aldose phosphate by the enzyme ________.

Question

Quizplus · Accepted Answer

Transaldolase is the enzyme responsible for transferring a three-carbon fragment, specifically a dihydroxyacetone (DHA) unit, from a ketose phosphate, such as fructose-6-phosphate, to an aldose phosphate, such as glyceraldehyde-3-phosphate, during the nonoxidative phase of the pentose phosphate pathway. Pyruvate carboxylase is not involved in this pathway, debranching enzyme is involved in glycogen breakdown, and ribose-5-phosphate isomerase catalyzes the conversion of ribose-5-phosphate to ribulose-5-phosphate in the pentose phosphate pathway, but not the transfer of a three-carbon fragment between two sugar phosphates.

Fragments Containing Three Carbons Can Be Transferred from a Ketose