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Noncovalent Attractions in Biomolecules

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...

Noncovalent Attractions in Biomolecules

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...

Covalent Bonds

Covalent Bonds

Covalent Bonds

Covalent Bonds

Overview
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally, creating polar bonds.

The Equilibrium Binding Constant and Binding Strength

The Equilibrium Binding Constant and Binding Strength

The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:

The Equilibrium Binding Constant and Binding Strength

The Equilibrium Binding Constant and Binding Strength

The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:

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Related Experiment Video

Updated: May 17, 2026

Detection of CD40 Protein-Umbelliferone Interaction via Differential Scanning Fluorescence

Detection of CD40 Protein-Umbelliferone Interaction via Differential Scanning Fluorescence

Published on: March 1, 2024

Detection of covalent binding.

M K Bruno¹, S D Cohen

¹University of Connecticut, Storrs, Connecticut, USA.

Current Protocols in Toxicology

|October 10, 2012

Summary

This summary is machine-generated.

Immunochemical methods offer a specific way to detect xenobiotics bound to proteins, revealing toxic mechanisms. These techniques, including immunoblotting and ELISA, identify target proteins and tissues more effectively than radiochemical studies.

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Area of Science:

Toxicology
Immunochemistry
Biochemistry

Background:

Xenobiotic exposure can lead to covalent binding with cellular proteins, a key event in toxic mechanisms.
Traditional radiochemical studies for detecting xenobiotic-protein adducts have limitations in specificity and target identification.
Immunochemical approaches provide a more specific and sensitive alternative for studying xenobiotic interactions with proteins.

Purpose of the Study:

To detail immunochemical methods for detecting xenobiotics covalently bound to cellular proteins.
To outline techniques for identifying specific protein targets and affected tissues.
To describe antibody characterization using enzyme-linked immunosorbent assays (ELISA).

Main Methods:

Immunoblotting for pinpointing target proteins.
Immunohistochemistry for identifying tissue targets.
Synthesis of artificial antigens and antibody production in host species.
Noncompetitive and competitive ELISA assays for antibody characterization.

Main Results:

Demonstration of immunochemical detection as a specific tool for xenobiotic-protein adducts.
Successful identification of target proteins and tissue localization of xenobiotic binding.
Characterization of generated antibodies confirming their utility in detection assays.

Conclusions:

Immunochemical detection of xenobiotic-protein adducts is a valuable tool for understanding toxic mechanisms.
These methods offer superior specificity and target identification compared to radiochemical approaches.
Protocols for antibody generation and characterization facilitate robust xenobiotic-adduct detection.