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Protein Complexes with Interchangeable Parts

Protein Complexes with Interchangeable Parts

Complexation Equilibria: Factors Influencing Stability of Complexes

Complexation Equilibria: Factors Influencing Stability of Complexes

In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...

Ladder Diagrams: Complexation Equilibria

Ladder Diagrams: Complexation Equilibria

Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...

Complexation Equilibria: Overview

Complexation Equilibria: Overview

Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
The equilibrium constant of the complexation reaction is represented as the formation constant...

Protein Complex Assembly

Protein Complex Assembly

Complexation Equilibria: The Chelate Effect

Complexation Equilibria: The Chelate Effect

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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Updated: Aug 16, 2025

A Comparative Approach to Characterize the Landscape of Host-Pathogen Protein-Protein Interactions

A Comparative Approach to Characterize the Landscape of Host-Pathogen Protein-Protein Interactions

Published on: July 18, 2013

Host-Guest Complexes.

Juan C Mejuto¹, Jesus Simal-Gandara²

¹Department of Physical Chemistry, Faculty of Science, University of Vigo, Ourense Campus, E32004 Ourense, Spain.

International Journal of Molecular Sciences

|December 23, 2022

Summary

Host-guest complexes, or inclusion complexes, are supramolecular structures formed when one molecule is enclosed within another. These complexes are crucial in supramolecular chemistry for molecular recognition and encapsulation applications.

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A Comparative Approach to Characterize the Landscape of Host-Pathogen Protein-Protein Interactions

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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

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Spatiotemporally Controlled Nuclear Translocation of Guests in Living Cells Using Caged Molecular Glues as Photoactivatable Tags

Spatiotemporally Controlled Nuclear Translocation of Guests in Living Cells Using Caged Molecular Glues as Photoactivatable Tags

Published on: January 17, 2019

Area of Science:

Supramolecular Chemistry
Materials Science

Background:

Host-guest complexes involve a host molecule encapsulating a guest molecule.
These structures are fundamental to supramolecular chemistry, enabling selective molecular recognition.

Discussion:

The study explores the formation and properties of host-guest complexes.
Understanding these interactions is key to designing novel functional materials.

Key Insights:

Inclusion complexes exhibit unique structural and dynamic properties based on host-guest interactions.
Precise control over complex formation allows for tailored applications.

Outlook:

Future research will focus on advanced applications in drug delivery and sensing.
Exploration of new host-guest systems will drive innovation in molecular encapsulation.