Glyceraldehyde free, from fructose 1-phosphate

Transaldolation a reaction of carbohydrate metabolism, in which a C3-unit (equivalent to a dihy-droxyacetone unit) is transferred from a ketose to an aldose. T. is catalysed by transaldolase (EC 2.2.1.2). The C3-unit does not exist in the free state, but remains bound to the e-group of a lysine residue in the enzyme (Fig ). Only fructose 6-phosphate and sedoheptulose 7-phosphate are cleaved by transaldolase. Acceptors for the C3-unit are the aldose phosphates, o-glyceraldehyde 3-phosphate, D-erythrose 4-phosphate and more rarely ribose 5-phosphate. There is no coenzyme and the mechanism of reaction is similar to that of aldolase (EC 4.1.2.13). 

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