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Related Concept Videos

Enzyme Inhibition01:30

Enzyme Inhibition

Inhibitors are molecules that reduce enzyme activity by binding to the enzyme. In a normally functioning cell, enzymes are regulated by a variety of inhibitors. Drugs and other toxins can also inhibit enzymes. Some inhibitors bind to the enzyme’s active site, while others inhibit enzymatic activity by binding to other sites on the protein structure.

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Molecular Modeling and In Vitro Evaluation of Thioureas and Arylthioureas as Urease Inhibitors.

Marciéli Fabris1, Priscila G Camargo2, Mariana L Silva1

  • 1Laboratório de Síntese de Moléculas Medicinais (LaSMMed), Departamento de Química, Universidade Estadual de Londrina (UEL), Rodovia Celso Garcia Cid, PR-445, Km 380, Londrina, Paraná 86057-970, Brasil.

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|June 9, 2025
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Summary

Researchers identified novel thiourea compounds as potent inhibitors of urease, an enzyme crucial for Helicobacter pylori survival. These findings offer promising new therapeutic strategies against antibiotic-resistant H. pylori infections.

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Area of Science:

  • Biochemistry
  • Medicinal Chemistry
  • Microbiology

Background:

  • Ureases are metalloenzymes vital for urea hydrolysis in various organisms.
  • Helicobacter pylori urease neutralizes stomach acid, contributing to gastrointestinal disorders.
  • Antibiotic resistance in H. pylori necessitates novel therapeutic approaches.

Purpose of the Study:

  • To identify novel urease inhibitors from the LaSMMed chemical library.
  • To develop new therapeutic agents targeting urease-producing bacteria like H. pylori.

Main Methods:

  • Virtual screening of the LaSMMed chemical library.
  • Synthesis and characterization of thiourea derivatives.
  • Enzyme inhibition assays and determination of IC50 and ki values.
  • Molecular modeling for structure-activity relationship analysis.

Main Results:

  • Six cinnamic acid-derived thioureas (LaSMMed 37-46) showed urease inhibition (13-82%).
  • A lead compound (LaSMMed 42) guided the design of new arylthioureas (LaSMMed 122-126) with higher activity (84-88%).
  • Inhibitors exhibited IC50 values from 0.464-0.575 mM and ki values from 0.080-0.130 mM, with competitive and mixed-type inhibition mechanisms.

Conclusions:

  • The identified arylthioureas are potent urease inhibitors.
  • These compounds demonstrate significant potential as therapeutic agents against H. pylori.
  • Molecular modeling supports their binding interactions and guides future drug design.