Table 3.

Inhibitory activities of PA and UDP against UGM.

Compounds	Turnover a (%)	Inhibition b (%)
PA	8.3 ± 2.6	85.8
UDP	0.4 ± 2.3	99.3
No inhibition	58.4 ± 3.4	Nd

^a % Turnover was determined by integration of the peak of the substrate and the peak of the product. ^b % Inhibition was calculated from the % turnover of the inhibited reaction compared to the reaction in the absence of inhibition. Nd: not determined; UDP: uridine-5′-diphosphate; PA: psoromic acid; UGM: UDP-galactopyranose mutase. The data are shown as the mean ± S.D; each result was performed in triplicate.