2. Academic Validation
  3. Potential Succinate Dehydrogenase Inhibitors Bearing a Novel Pyrazole-4-sulfonohydrazide Scaffold: Molecular Design, Antifungal Evaluation, and Action Mechanism

Potential Succinate Dehydrogenase Inhibitors Bearing a Novel Pyrazole-4-sulfonohydrazide Scaffold: Molecular Design, Antifungal Evaluation, and Action Mechanism

  • J Agric Food Chem. 2023 Jun 21;71(24):9266-9279. doi: 10.1021/acs.jafc.3c00126.
Jian-Qi Chai 1 2,  Yu-Dong Mei 1 3,  Lang Tai 1,  Xiao-Bin Wang 1 2 4,  Min Chen 1 2,  Xiang-Yi Kong 1,  Ai-Min Lu 1 2,  Guo-Hua Li 1 2,  Chun-Long Yang 1 2
Affiliations

Affiliations

  • 1 College of Sciences, Nanjing Agricultural University, Nanjing 210095, China.
  • 2 Jiangsu Key Laboratory of Pesticide Science, Nanjing Agricultural University, Nanjing 210095, China.
  • 3 Nanjing Zhuoran Inspection Limited Corporation, Nanjing 210095, China.
  • 4 College of Pharmacy, Jiangsu Ocean University, Lianyungang 222005, China.
PMID: 37294885 DOI: 10.1021/acs.jafc.3c00126
Abstract

Aiming to develop novel Antifungal agents with a distinctive molecular scaffold targeting succinate dehydrogenase (SDH), 24 N'-phenyl-1H-pyrazole-4-sulfonohydrazide derivatives were first devised, synthesized, and verified by 1H NMR, 13C NMR, high-resolution mass spectrometry (HRMS), and single-crystal X-ray diffraction analysis. The bioassays revealed that the target compounds possessed highly efficient and broad-spectrum Antifungal activities against four tested plant pathogenic fungi Rhizoctonia solani (R. solani), Botrytis cinerea, Fusarium graminearum, and Alternaria sonali. Strikingly, compound B6 was assessed as the selective inhibitor against R. solani, with an in vitro EC50 value (0.23 μg/mL) that was similar to that of thifluzamide (0.20 μg/mL). The in vivo preventative effect of compound B6 (75.76%) at 200 μg/mL against R. solani was roughly comparable to thifluzamide (84.31%) under the same conditions. The exploration of morphological observations indicated that compound B6 could strongly damage the mycelium morphology, obviously increase the permeability of the cell membrane, and dramatically increase the number of mitochondria. Compound B6 also significantly inhibited SDH Enzyme activity with an IC50 value of 0.28 μg/mL, and its fluorescence quenching dynamic curves were similar to that of thifluzamide. Molecular docking and molecular dynamics simulations demonstrated that compound B6 could strongly interact with similar residues around the SDH active pocket as thifluzamide. The present study revealed that the novel N'-phenyl-1H-pyrazole pyrazole-4-sulfonohydrazide derivatives are worthy of being further investigated as the promising replacements of traditional carboxamide derivatives targeting SDH of fungi.

Keywords

antifungal effect; lead discovery; molecular docking; molecular dynamics simulation; pyrazole-4-sulfonohydrazide; succinate dehydrogenase inhibitor.

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