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Protein-protein Interfaces02:04

Protein-protein Interfaces

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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...
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Related Experiment Video

Updated: Oct 8, 2025

Conformational Evaluation of HIV-1 Trimeric Envelope Glycoproteins Using a Cell-based ELISA Assay
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Conformational Evaluation of HIV-1 Trimeric Envelope Glycoproteins Using a Cell-based ELISA Assay

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IgG1-b12-HIV-gp120 Interface in Solution: A Computational Study.

Didac Martí1,2, Carlos Alemán1,2,3, Jon Ainsley1,4

  • 1Department of Chemical Engineering (EEBE), Universitat Politècnica de Catalunya, C/Eduard Maristany 10-14, Ed I2, 08019 Barcelona, Spain.

Journal of Chemical Information and Modeling
|December 31, 2021
PubMed
Summary
This summary is machine-generated.

Researchers studied how broadly neutralizing antibodies bind to HIV-1, finding key interactions for better antibody design. Understanding the b12-gp120 binding mechanism is crucial for developing effective HIV prevention strategies.

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Last Updated: Oct 8, 2025

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Area of Science:

  • Immunology
  • Virology
  • Biochemistry

Background:

  • Broadly neutralizing antibodies (bNAbs) are promising for HIV-1 prevention.
  • Understanding antibody-gp120 interactions is key to designing more effective HIV therapies.

Purpose of the Study:

  • To investigate the binding mechanism between the IgG1-b12 monoclonal antibody (mAb) and the gp120 protein of HIV-1 under physiological conditions.
  • To identify persistent interactions and key conformations in the antibody-antigen complex.

Main Methods:

  • Utilized accelerated molecular dynamics (aMD) and ab initio hybrid molecular dynamics simulations.
  • Analyzed antibody-antigen complex conformations and interactions in solution.

Main Results:

  • Identified the most persistent receptor-binding interactions within the antibody-antigen interface.
  • Binding-free energy decomposition showed an enhanced contribution from the CDR-H3 region in solution compared to crystal structures.

Conclusions:

  • The study elucidates critical binding interactions between b12 mAb and HIV-1 gp120 under physiological conditions.
  • Findings provide insights for the rational design of next-generation HIV-1 broadly neutralizing antibodies.