Related Experiment Video
Updated: Jan 29, 2026
14:44
Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
Published on: December 16, 2013
10.1K
Indolizinoquinolinedione Metal Complexes: Structural Characterization, In Vitro Antibacterial, and In Silico Studies.
Jacopo Vigna1, Michael Marchesi1, Ibtissem Djinni2
1Laboratory of Bioorganic Chemistry, Department of Physics, University of Trento, 38123 Trento, Italy.
Molecules (Basel, Switzerland)
|January 28, 2026
Summary
New indolizinoquinolinedione analogs show promise against resistant bacteria. Compound 2 and its metal complexes demonstrate significant antimicrobial activity, with docking studies suggesting potential bacterial targets for future drug development.
Area of Science:
- Medicinal Chemistry
- Antimicrobial Resistance Research
- Coordination Chemistry
Background:
- Antimicrobial resistance (AMR) is a critical global health challenge requiring novel therapeutic agents.
- Indolizinoquinolinedione analogs have emerged as potential candidates for combating bacterial infections.
- Metal complexation is a strategy to enhance the bioactivity and overcome resistance mechanisms of existing compounds.
Purpose of the Study:
- To synthesize and evaluate new metal complexes of a potent indolizinoquinolinedione analog, compound 2.
- To investigate the structural and electronic properties of these metal complexes.
- To explore the potential of compound 2 and its complexes as antimicrobial agents against resistant bacteria.
Main Methods:
- In vitro antimicrobial susceptibility testing against various bacterial strains, including MRSA.
- Synthesis and characterization of metal complexes using FT-IR, ESI-MS, UV-Vis spectroscopy, and NMR.
- Density Functional Theory (DFT) calculations for spectral simulation and charge distribution analysis.
- Molecular docking studies to identify potential bacterial protein targets.
Main Results:
- Compound 2 exhibited significant activity against Bacillus subtilis, Bacillus cereus, Staphylococcus aureus, and MRSA.
- Zn, Cu, and Mn complexes (8-10) of compound 2 were successfully synthesized, with confirmed C=O chelation and 1:1 metal-to-ligand stoichiometry.
- Complexes 8-10 showed comparable activity to vancomycin against S. aureus and retained activity against B. subtilis, though lower than compound 2.
- Docking studies indicated FTsZ protein and DNA gyrase as potential targets, correlating well with in vitro findings.
Conclusions:
- Compound 2 is a highly active antimicrobial agent with potential against resistant bacteria.
- The synthesized metal complexes retain antimicrobial activity and offer a platform for further drug development.
- Computational studies provide valuable insights into the mechanism of action and potential targets, guiding future research in AMR.
Keywords:
Acinetobacter baumaniiIndolizinoquinoline-5,12-dione derivativesJob’s plotMIC evaluationMRSAantibiotic resistancedensity functional theory (DFT) calculationmetal chelatesmolecular dockingMore Related Videos
Related Concept Videos
01:32Assembly of Complex Microtubule Structures
2.5K
Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
2.5K
02:51Metal-Ligand Bonds
24.2K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
24.2K
02:37Metallic Solids
20.6K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.6K
02:34Structural Isomerism
21.7K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
21.7K
02:32Bonding in Metals
52.3K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
52.3K
03:06Alkali Metals
24.5K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
24.5K