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Antibody Structure

Antibody Structure

Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...

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Peptide Scanning-assisted Identification of a Monoclonal Antibody-recognized Linear B-cell Epitope

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QTY code designed antibodies for aggregation prevention: A structural bioinformatic and computational study.

Mengke Li^1,2, Yanze Wang³, Fei Tao²

¹Laboratory of Molecular Architecture, Media Lab, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.

|October 5, 2023

Summary

This summary is machine-generated.

A new QTY code strategy reduces antibody aggregation by modifying beta-sheets, enhancing protein solubility and stability. This method shows promise for improving therapeutic antibody manufacturing and efficacy.

Keywords:

AlphaFold2 protein structural predictions hydrophobic to hydrophilic conversion hydrophobic/hydrophilic beta-sheet molecular dynamics simulation protein design

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Area of Science:

Biochemistry
Molecular Biology
Protein Engineering

Background:

Therapeutic monoclonal antibodies are crucial in medicine but prone to aggregation during production and storage.
Antibody aggregation can reduce efficacy and trigger adverse immune responses.
Current methods for controlling aggregation can be limited.

Purpose of the Study:

To investigate the efficacy of the QTY code in reducing antibody aggregation.
To design and analyze antibody variants with modified beta-sheets using the QTY code.
To assess the impact of the QTY code on antibody stability and antigen-binding affinity.

Main Methods:

Designed antibody variants by systematically replacing hydrophobic residues in beta-sheets with glutamine, threonine, and tyrosine (QTY code).
Performed structure-based aggregation analysis to compare variants with wild-type antibodies.
Utilized molecular dynamics simulations to evaluate antigen-binding affinity and structural stability.

Main Results:

QTY code antibody variants exhibited significantly reduced aggregation propensity compared to wild-type counterparts.
Molecular dynamics simulations confirmed that QTY code design maintains antigen-binding affinity.
The structural integrity and stability of the antibody variants were preserved.

Conclusions:

The QTY code is a viable strategy for mitigating antibody aggregation.
This approach offers a promising alternative for improving the manufacturability and therapeutic potential of antibodies.
Further application of the QTY code could enhance the development of stable and effective protein-based therapeutics.