By targeting the thiamin diphosphate (ThDP) binding site of Escherichia coli (E. coli) pyruvate dehydrogenase multienzyme complex E1 (PDHc E1), a series of novel ‘open-chain’ classes of ThDP analogs A, B, and C with N-acylhydrazone moieties was designed and synthesized to explore their activities against E. coli PHDc E1 in vitro and their inhibitory activity against microbial diseases were further evaluated in vivo. As a result, A1–23 exhibited moderate to potent inhibitory activities against E. coli PDHc E1 (IC₅₀ = 0.15–23.55 μM). The potent inhibitors A13, A14, A15, C2, had strong inhibitory activities with IC₅₀ values of 0.60, 0.15, 0.39 and 0.34 μM against E. coli PDHc E1 and with good enzyme-selective inhibition between microorganisms and mammals. Especially, the most powerful inhibitor A14 could 99.37% control Xanthimonas oryzae pv. Oryzae. Furthermore, the binding features of compound A14 within E. coli PDHc E1 were investigated to provide useful insights for the further construction of new inhibitor by molecular docking, site-directed mutagenesis, and enzymatic assays. The results indicated that A14 had most powerful inhibition against E. coli PDHc E1 due to the establishment of stronger interaction with Glu571, Met194, Glu522, Leu264 and Phe602 at active site of E.coli PDHc E1. It could be used as a lead compound for further optimization, and may have potential as a new microbicide.

通过靶向硫胺二磷酸（THDP）结合位点的大肠杆菌（大肠杆菌）丙酮酸脱氢酶多酶复合物E1（PDHC E1），一系列的THDP小说“开链”类的类似物甲，乙，和Ç与ñ -设计并合成了酰基to部分，以探讨它们在体外对大肠杆菌PHDc E1的活性，并在体内进一步评价其对微生物疾病的抑制作用。结果，A1 – 23对大肠杆菌PDHc E1表现出了中度到强效的抑制活性（IC ₅₀ = 0.15–23.55μM）。有效的抑制剂A13，A14，A15，C2具有很强的抑制活性，对大肠杆菌PDHc E1的IC ₅₀值为0.60、0.15、0.39和0.34μM，并且在微生物和哺乳动物之间具有良好的酶选择性抑制作用。特别是，最有效的抑制剂A14可以控制99.37％的米地黄单胞菌（Xanthimonas oryzae pv）。Oryzae。此外，化合物A14在大肠杆菌中的结合特征对PDHc E1进行了研究，以通过分子对接，定点诱变和酶促测定为进一步构建新抑制剂提供有用的见识。结果表明，A14对大肠杆菌PDHc E1的抑制作用最强，这是因为它在大肠杆菌PDHc E1的活性位点与Glu571，Met194，Glu522，Leu264和Phe602建立了更强的相互作用。它可以用作进一步优化的先导化合物，并有可能作为新型杀菌剂使用。