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Structural models of antibody variable fragments: a method for investigating binding mechanisms
1Laboratoire de Modélisation Moléculaire, IRCOF, IFRMP No. 23, Université de Rouen, Mont-Saint-Aignan, France.
Journal of Computer-Aided Molecular Design
|August 5, 1998
Summary
Comparative molecular modeling reveals diverse binding mechanisms for anti-nucleosome autoantibodies, suggesting varied origins. This structural analysis aids in understanding autoimmune diseases like systemic lupus erythematosus.
Area of Science:
- Structural Biology
- Immunology
- Computational Chemistry
Background:
- Anti-nucleosome autoantibodies are implicated in systemic lupus erythematosus (SLE).
- Understanding the structure-function relationship of these autoantibodies is crucial for elucidating disease mechanisms.
Purpose of the Study:
- To analyze the structural and electrostatic properties of anti-nucleosome autoantibody variable fragments using comparative molecular modeling.
- To investigate potential antigen binding mechanisms and explore the diversity of anti-nucleosome autoantibodies.
- To assess the utility of comparative modeling in understanding autoimmune disease origins.
Main Methods:
- Comparative molecular modeling using COMPOSER software.
- Energy minimization with the AMBER force field.
- Validation using geometric criteria and Chothia and Lesk's canonical class assignment for hypervariable loops.
- Analysis of molecular surface properties and electrostatic interactions.
Main Results:
- Structural models of six anti-nucleosome autoantibody variable fragments were generated and validated.
- A diversity of potential binding mechanisms between antibodies and their cognate antigens was identified.
- Electrostatic interactions were highlighted as a key factor in antigen binding.
Conclusions:
- Anti-nucleosome autoantibodies exhibit diverse structural and binding characteristics, suggesting potentially different origins.
- Comparative modeling and surface property analysis offer insights into autoantibody diversity and function.
- Further comparative analysis of anti-DNA and anti-nucleosome autoantibodies could illuminate their roles in SLE pathogenesis and tolerance breakdown.