Structural biology of innate immunity

Area of Science:

• Immunology
• Molecular Biology
• Structural Biology

Background:

• Innate immunity involves recognizing danger signals via cell surface and cytoplasmic receptors.
• Four major signaling pathways (Toll-like receptors, RIG-I-like receptors, inflammasomes, cGAS) orchestrate innate immune responses.
• These pathways trigger outcomes like NF-κB activation, interferon response, cytokine maturation, and cell death.

Purpose of the Study:

• To review recent advancements in understanding the mechanistic details of innate immune signaling pathways.
• To elucidate the structural features, ligand recognition, and assembly mechanisms of key proteins involved.
• To identify common themes in signal transduction across different innate immune pathways.

Main Methods:

• Review of recent scientific literature on innate immune signaling.
• Analysis of structural data and mechanistic studies of key proteins.
• Comparative analysis of signaling pathways including Toll-like receptors, RIG-I-like receptors, inflammasomes, and cGAS.

Main Results:

• Detailed mechanistic insights into protein functions within the four major innate immune pathways.
• Characterization of structural features, ligand binding, and conformational changes.
• Identification of conserved protein-protein interactions driving the formation of supramolecular signaling complexes.

Conclusions:

• Recurring themes in innate immunity include autoinhibited resting states, ligand-induced conformational changes, and higher-order assemblies.
• Conserved protein-protein interactions facilitate signal transduction and amplification across diverse pathways.
• Understanding these conserved mechanisms is crucial for deciphering innate immune responses.