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Updated: Sep 22, 2026
FtsZ Polymerization Assays: Simple Protocols and Considerations
Published on: November 16, 2013
Crystal structure of FtsZ from Acinetobacter baumannii and identification of a potential inhibitor targeting its
Amit Kumar Yadav1, Farah Naz1, Alankrita Singh1
1Department of Biophysics, All India Institute of Medical Sciences, New Delhi, 110029, India.
Abstract:
Acinetobacter baumannii is an opportunistic pathogen known for its extensive antibiotic resistance, posing a significant concern in healthcare settings. Given global concern over broad-spectrum antibiotic use and its impact on the human microbiome, targeting the bacterial cell-division protein Filamenting temperature-sensitive Z (FtsZ) is a promising strategy for developing new antibiotics, as this protein is essential for bacterial cell division. FtsZ polymerizes into filaments to form the Z-ring at the cell division site. This Z-ring orchestrates the recruitment of other crucial proteins in cytokinesis and cell wall synthesis, making it critical for bacterial viability. To target FtsZ from Acinetobacter baumannii (abFtsZ), we have elucidated the first crystal structures in the apo and GDP-bound state. The structural analysis revealed that the abFtsZ-GDP complex exists in a relaxed state conformation with weak inter-subunit interactions. The GTPase activity of abFtsZ showed a Vmax of 3.3 ± 0.4 nmolP/nmolFtsZ/min, and a Km of 2.3 mM. By virtual screening using the crystal structure of abFtsZ, we identified six potential inhibitors: Gossypin, Stafib-1, Tryphostin A51, Sangivamycin, Scutellarin, and Ellagic acid that target the GTP-binding pocket. These inhibitors exhibited high docking scores ranging from -10.2 to -8.4 kcal/mol and remained stable throughout the 500 ns MD simulation. These inhibitors can serve as lead molecules for the development of a new antibacterial agent.
Insights
Researchers identified potential new antibiotics targeting the essential bacterial cell division protein Filamenting temperature-sensitive Z (FtsZ) in Acinetobacter baumannii. Six compounds show promise as lead molecules for novel antibacterial drug development.
Area of Science:
- Microbiology
- Structural Biology
- Drug Discovery
Background:
- Acinetobacter baumannii is a highly antibiotic-resistant opportunistic pathogen, posing a significant threat in healthcare.
- Targeting essential bacterial proteins like Filamenting temperature-sensitive Z (FtsZ) is a key strategy for novel antibiotic development.
- FtsZ is crucial for bacterial cell division, forming the Z-ring that orchestrates cytokinesis and cell wall synthesis.
Purpose of the Study:
- To elucidate the crystal structures of Acinetobacter baumannii FtsZ (abFtsZ) in apo and GDP-bound states.
- To identify potential inhibitors of abFtsZ through virtual screening.
- To provide structural insights for developing new antibacterial agents against resistant bacteria.
Main Methods:
- X-ray crystallography was used to determine the apo and GDP-bound structures of abFtsZ.
- GTPase activity assays were performed to characterize abFtsZ kinetics.
- Virtual screening and molecular dynamics (MD) simulations were employed to identify and validate potential inhibitors targeting the GTP-binding pocket.
Main Results:
- The first crystal structures of abFtsZ in apo and GDP-bound states were determined, revealing a relaxed conformation with weak inter-subunit interactions.
- abFtsZ exhibits GTPase activity with a Vmax of 3.3 ± 0.4 nmolP/nmolFtsZ/min and a Km of 2.3 mM.
- Six potential abFtsZ inhibitors (Gossypin, Stafib-1, Tryphostin A51, Sangivamycin, Scutellarin, Ellagic acid) were identified with high docking scores and stability in MD simulations.
Conclusions:
- The determined abFtsZ structures provide a basis for structure-based drug design.
- Identified inhibitors targeting the GTP-binding pocket are promising lead compounds for developing new antibiotics against Acinetobacter baumannii.
- This study offers a novel strategy to combat antibiotic resistance by targeting essential bacterial cell division.
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