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Bioactive conformation of drugs is one of the key points for understanding the ligand-receptor interactions. In the present study, by combining density functional theory-based (DFT-based) conformation analysis with quantitative structure-activity relationship analysis (QSAR), we developed successfully a new approach (DFT/QSAR) to carry out bioactive(More)
Acetylcholinesterase (AChE) is a key enzyme of the cholinergic nervous system. More than one gene encodes the synaptic AChE target. As the most potent known AChE inhibitor, the syn1-TZ2PA6 isomer was recently shown to have higher affinity as a reversible organic inhibitor of acetylcholinesterase1 (AChE1) than the anti1-TZ2PA6 isomer. Opposite selectivity(More)
Drug resistance has become one of the biggest challenges in drug discovery and/or development and has attracted great research interests worldwide. During the past decade, computational strategies have been developed to predict target mutation-induced drug resistance. Meanwhile, various molecular design strategies, including targeting protein backbone,(More)
A critical challenge to the fragment-based drug discovery (FBDD) is its low-throughput nature due to the necessity of biophysical method-based fragment screening. Herein, a method of pharmacophore-linked fragment virtual screening (PFVS) was successfully developed. Its application yielded the first picomolar-range Q(o) site inhibitors of the cytochrome(More)
Protoporphyrinogen oxidase (Protox, EC has attracted great interest during the last decades due to its unique biochemical characteristics and biomedical significance. As a continuation of our research work on the development of new PPO inhibitors, 23 new 1,3,4-thiadiazol-2(3H)-ones bearing benzothiazole substructure were designed and synthesized.(More)
As the last common enzyme in the biosynthetic pathway leading to heme and chlorophyll, protoporphyrinogen oxidase (PPO; EC is an ideal target for herbicide development. Currently, about 30 PPO inhibitors have been developed as agricultural herbicides. PPO inhibitors have displayed environmentally benign, but advantageous characteristics, including(More)
The drug resistance of various clinically available HIV-1 protease inhibitors has been studied using a new computational protocol, that is, computational mutation scanning (CMS), leading to valuable insights into the resistance mechanisms and structure-resistance correction of the HIV-1 protease inhibitors associated with a variety of active site and(More)
It is well known that Auxin plays a key role in controlling many aspects of plant growth and development. Crystal structures of Transport inhibitor response 1 (TIR1), a true receptor of auxin, were very recently determined for TIR1 alone and in complexes with auxin and different synthetic analogues and an Auxin/Indole-3-Acetic Acid (Aux/IAA) substrate(More)
Protoporphyrinogen oxidase (PPO; EC is the last common enzyme for the enzymatic transformation of protoporphyrinogen-IX to protoporphyrin-IX, which is the key common intermediate leading to heme and chlorophyll. Hence, PPO has been identified as one of the most importance action targets for the treatment of some important diseases including cancer(More)
Grass weed populations resistant to acetyl-CoA carboxylase-inhibiting (ACCase; EC herbicides represent a major problem for the sustainable development of modern agriculture. In the present study, extensive computational simulations, including homology modeling, molecular dynamics (MD) simulations, and molecular mechanics-Poisson-Boltzmann surface(More)