Title:Structural Optimization for 4-hydroxyphenylpyruvate Dioxygenase Inhibitors
Based on 3D-QSAR, Molecular Docking, SBP Modeling and MOLCAD
Studies
Volume: 20
Issue: 12
Author(s): Jiaqin He, Mei Zhang, Keying Chen, Xiaomeng Wang, Juan Wang*Zhihua Lin*
Affiliation:
- Department of Pharmacy and Bioengineering, Chongqing University of Technology, Chongqing, 400054, P. R. China;
- Key Laboratory of Screening and Activity Evaluation of Targeted Drugs, Chongqing, 400054, P. R. China
- Department of Pharmacy and Bioengineering, Chongqing University of Technology, Chongqing, 400054, P. R. China;
- Key Laboratory of Screening and Activity Evaluation of Targeted Drugs, Chongqing, 400054, P. R. China
Keywords:
HPPD inhibitor, 3D-QSAR, molecular docking, MOLCAD, SBP, antagonists.
Abstract: Background: The research based on natural product herbicides has been increasingly attractive
in the field of agriculture. 4-hydroxyphenylpyruvate dioxygenase (HPPD) is one of the most promising
compounds in the field of herbicide innovation.
Objective: This paper aims to study the relationship between the activity and structure of quinazoline-
2,4-dione derivatives, and to design novel HPPD inhibitors.
Methods: A set of quinazoline-2,4-dione derivatives underwent 3D-QSAR studies as well as molecular
docking. MOLCAD analysis and 8-point pharmacophore model provided an important reference for us to
understand the interaction mode of HPPD and antagonists.
Results: The CoMFA (n = 5; q2 = 0.778; r2 = 0.985) and CoMSIA (n = 6; q2 = 0.776; r2 = 0.95) models
had remarkable stability and predictability. MOLCAD studies and pharmacophore modeling proved the
validity of the 3D-QSAR model. On the basis of the gained information, nine novel derivatives as potential
candidates of HPPD inhibitors with better predicted activities were designed, mainly binding to HPPD
via lipophilic interaction and hydrogen bonding. The key hydrophobic residues of HPPD, Phe381,
His308, Asn282, Phe392 and Leu368, were found to be antagonist binding sites that are important factors
for the stability of the antagonist binding site.
Conclusion: The structural basis and activity of HPPD inhibitors were revealed, which might provide
clear and solid insights to guide the rational design of novel HPPD inhibitors.