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Related Concept Videos

Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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...
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Inhibitors of Bacterial DNA Synthesis01:28

Inhibitors of Bacterial DNA Synthesis

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Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These...
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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
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Macrocyclic polyoxazoles as G-quadruplex ligands.

Keisuke Iida1, Kazuo Nagasawa

  • 1Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan.

Chemical Record (New York, N.Y.)
|December 19, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed telomestatin-inspired macrocyclic polyoxazoles as G-quadruplex (G4) ligands. Hexaoxazole derivatives showed G4 stabilization, with cationic groups enhancing interaction, while heptaoxazole derivatives demonstrated potent G4 binding.

Keywords:
DNA structuresG-quadruplexesfluorescent probespolyoxazolestelomestatin

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Area of Science:

  • Medicinal Chemistry
  • Organic Synthesis
  • Biochemistry

Background:

  • G-quadruplex (G4) structures are unique nucleic acid motifs implicated in various biological processes.
  • Developing small molecules to selectively target and stabilize G4 structures is a key area in therapeutic research.
  • Telomestatin serves as a benchmark for G4-ligand design.

Purpose of the Study:

  • To review recent advancements in the synthesis and evaluation of telomestatin-inspired macrocyclic polyoxazoles as G-quadruplex ligands.
  • To investigate the structure-activity relationships of these novel G4 ligands.
  • To report the synthesis of specific caged and fluorescent G4 ligands.

Main Methods:

  • Synthesis of hexaoxazole derivatives (6OTDs) and heptaoxazole derivatives (7OTDs).
  • Evaluation of G4-binding and stabilization capabilities of the synthesized compounds.
  • Assessment of the influence of side chain functional groups on ligand efficacy.

Main Results:

  • Hexaoxazole derivatives (6OTDs) demonstrated G4 interaction and stabilization, with cationic functional groups showing enhanced efficacy via secondary interactions with the DNA backbone.
  • Heptaoxazole derivatives (7OTDs) exhibited potent G4-binding and stabilization activity irrespective of the side chain's functional groups.
  • A caged G4 ligand (Y2Nv2-6OTD) and a fluorescent G4 ligand (L1BOD-7OTD) were successfully synthesized.

Conclusions:

  • Macrocyclic polyoxazoles, inspired by telomestatin, represent a promising class of G4 ligands.
  • The design of G4 ligands can be modulated by varying the macrocycle size and side chain functionalities.
  • The synthesized caged and fluorescent G4 ligands offer potential for further biological studies and applications.