Defining and Studying B Cell Receptor and TCR Interactions.

Area of Science:

• Immunology
• Structural Biology
• Computational Biology

Background:

• Adaptive immune receptors (AIRs), including B cell receptors (BCRs) and T cell receptors (TCRs), are crucial for distinguishing self from foreign antigens, impacting host defense and autoimmunity.
• The interaction between AIRs and antigens is a complex many-to-many mapping, not a simple lock-and-key mechanism, due to the vast diversity of both AIR repertoires and antigenic landscapes.
• Current terminology for AIR-antigen binding (e.g., broad specificity, cross-reactivity, polyreactivity) is inconsistently applied, posing a challenge for understanding adaptive immunity's balance between specificity and coverage.

Purpose of the Study:

• To define and clarify commonly used terms related to adaptive immune receptor (AIR) binding to antigens.
• To describe various methodologies employed to study these complex binding interactions.
• To highlight the implications of different AIR-BCR/TCR binding modes for the design of novel therapeutics.

Main Methods:

• Literature review and expert consensus to define key terminology.
• Description of experimental techniques for studying AIR-antigen interactions (e.g., structural and biophysical methods).
• Overview of computational approaches for analyzing AIR repertoire diversity and binding.

Main Results:

• Established clear definitions for terms like broad specificity, cross-reactivity, and polyreactivity in the context of AIR-BCR/TCR binding.
• Outlined a range of experimental and computational methods suitable for characterizing AIR-antigen binding modes.
• Provided insights into how understanding these binding dynamics can inform the development of targeted immunotherapies.

Conclusions:

• Standardizing terminology and employing diverse methodologies are essential for advancing the understanding of adaptive immunity.
• Clarifying AIR-antigen binding characteristics is critical for designing effective immunotherapies and understanding autoimmune diseases.
• This work provides a foundational resource for researchers and clinicians in immunology and therapeutic design.