In summary, a series of newly 5-iodo-1,4-disubstituted-1,2,3-triazole derivatives 3 were prepared as potential E. coli PDHc-E1 inhibitors and their antifungal activity was evaluated. All tested compound 3 exhibited significant inhibition against E. coli PDHc-E1 (IC50 <21 μM). Compound 3g was found to be the most powerful inhibitor (IC50 = 4.21 ± 0.11) and was recognized to act as a competitive inhibitor of ThDP against E. coli PDHc-E1 by the kinetic analysis. Compounds 3g, 3n, 3p, and lead compound I-