Which enzyme converts D-form of a sugar to an L-form of sugar?

This class of enzymes is responsible for catalyzing reactions, that result in the rearrangement of the molecular structures, within the reactants. This action results in the chemical conversion of a molecule into another related molecule, called an isomer of the original molecule - the process is called isomerization. The chemical conversion of a D-form of a sugar to an L-form of a sugar, would be a good example of an isomerization reaction, catalyzed by such enzymes.