In this lecture, we're going to discuss the reaction mechanism of transaldelase. Now, unlike transketilase, which basically catalyzed the movement of a two carbon component to carbon group, we see that transaldelase actually catalyze the transfer of a three carbon molecule known as dihydroxy acetone. And unlike transketulates that uses a Cofactor molecule known as thiamine pyrophosphate, we'll see in this lecture that transaldelase does not actually use that Cofactor thiamine pyrophosphate. Instead, what it does is it forms a shift base between the catalytic lysine residue in the active side of the enzyme and the incoming keto substrate molecule. So to see exactly what we mean, let's actually take a look at the details of the reaction mechanism. So this is the portion of the lysine residue found in the active site of the enzyme, and this is the incoming substrate molecule.