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Bioinformatics Resources for the Study of Glycan-Mediated Protein Interactions

Bioinformatics Resources for the Study of Glycan-Mediated Protein Interactions

Published on: January 20, 2022

CH-π Interactions in Glycan Recognition.

Laura L Kiessling¹, Roger C Diehl¹

¹Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

ACS Chemical Biology

|October 7, 2021

Summary

This summary is machine-generated.

Proteins bind sugars using CH-π interactions, driven by electron-rich aromatic residues like tyrosine and tryptophan. This interaction

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Area of Science:

Biochemistry
Molecular Biology
Structural Biology

Background:

Carbohydrate recognition is vital for numerous biological processes.
Proteins that bind carbohydrates (glycans) must overcome the challenge of extracting hydrophilic sugars from water into their binding sites.
Previous bioinformatic analysis identified electron-rich aromatic residues, such as tyrosine and tryptophan, as frequently overrepresented in glycan-binding sites.

Purpose of the Study:

To investigate the underlying forces governing protein-glycan interactions.
To elucidate the role of CH-π interactions in carbohydrate recognition by proteins.

Main Methods:

Bioinformatic analysis of existing glycan-binding sites.
Examination of the electronic properties influencing CH-π interactions between aromatic residues and carbohydrate C-H bonds.

Main Results:

Electron-rich aromatic side chains (tyrosine, tryptophan) are prevalent in glycan-binding proteins.
CH-π interactions are a significant force in protein-glycan binding, dependent on electron-rich π systems.
Binding is enhanced by complementary electronic interactions between aromatic rings and polarized carbohydrate C-H bonds.
Specific carbohydrate residues, like β-galactose with aligned polarized C-H bonds, form stronger CH-π interactions than others, such as α-mannose.

Conclusions:

CH-π interactions, mediated by aromatic residues, are crucial for effective glycan recognition.
The electronic complementarity between protein and carbohydrate dictates the strength of CH-π interactions.
This understanding can inform the rational design of novel proteins for sugar binding and the development of ligands or catalysts targeting carbohydrate interactions.