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Ligand Binding Sites

Ligand Binding Sites

Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...

Conserved Binding Sites

Conserved Binding Sites

Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...

Conserved Binding Sites

Conserved Binding Sites

Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...

Assembly of Signaling Complexes

Assembly of Signaling Complexes

Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...

Ligand Binding and Linkage

Ligand Binding and Linkage

Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...

Protein-protein Interfaces

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...

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Related Experiment Video

Updated: May 20, 2026

Protein Engineering by Yeast Surface Display

Protein Engineering by Yeast Surface Display

Published on: November 29, 2024

Structural insights for engineering binding proteins based on non-antibody scaffolds.

Ryan N Gilbreth¹, Shohei Koide

¹Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, IL 60637, USA. skoide@uchicago.edu

Current Opinion in Structural Biology

|July 4, 2012

Summary

Engineered binding proteins from alternative scaffolds are vital research and therapeutic tools. Their structures reveal molecular recognition principles, aiding in improved protein engineering strategies.

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Published on: August 6, 2018

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Last Updated: May 20, 2026

Protein Engineering by Yeast Surface Display

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Published on: November 29, 2024

Analyzing Dynamic Protein Complexes Assembled On and Released From Biolayer Interferometry Biosensor Using Mass Spectrometry and Electron Microscopy

Analyzing Dynamic Protein Complexes Assembled On and Released From Biolayer Interferometry Biosensor Using Mass Spectrometry and Electron Microscopy

Published on: August 6, 2018

Area of Science:

Biochemistry
Structural Biology
Protein Engineering

Background:

Non-antibody scaffolds are increasingly used for engineered binding proteins in research and therapeutics.
Crystal structures of these proteins bound to targets are becoming more numerous.

Purpose of the Study:

To illustrate common and unique molecular recognition mechanisms.
To aid in assessing and improving protein engineering strategies.
To deepen understanding of molecular recognition principles.

Main Methods:

Analysis of crystal structures of engineered binding proteins.
Comparison of structural features across different scaffold systems.
Directed evolution techniques for protein production.

Main Results:

Structural data reveals conserved and specific molecular recognition mechanisms.
Insights into the structure-function relationships of engineered binding proteins.
Understanding of how directed evolution influences protein structure and binding.

Conclusions:

Structural insights are crucial for advancing engineered binding protein design.
Understanding molecular recognition mechanisms enhances protein engineering approaches.
These synthetic proteins offer valuable models for studying fundamental binding principles.