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Dynamics on human Toll-like receptor 4 complexation to MD-2: the coreceptor stabilizing function.

Carla de Aguiar¹, Mauricio G S Costa, Hugo Verli

¹Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, CP 15005, Porto Alegre, 91500-970, RS, Brazil.

|December 10, 2014

Summary

The myeloid differentiation factor 2 (MD-2) coreceptor stabilizes human Toll-like receptor 4 (hTLR4) dynamics, revealing key interactions crucial for lipopolysaccharide (LPS) immune recognition and signaling.

Keywords:

TLR innate immunity molecular dynamics normal mode structural biology

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Area of Science:

Immunology
Structural Biology
Computational Biology

Background:

Human Toll-like receptor 4 (hTLR4) and myeloid differentiation factor 2 (MD-2) are critical for recognizing Gram-negative bacterial lipopolysaccharide (LPS).
MD-2 binding to LPS facilitates hTLR4 dimerization, initiating intracellular immune signaling pathways.

Purpose of the Study:

To computationally explore the dynamical properties of the hTLR4-MD-2 complex.
To investigate how MD-2 complexation impacts the structural biology and dynamics of hTLR4.

Main Methods:

Employed molecular dynamics and normal mode analysis.
Characterized global and local dynamics of free and MD-2-complexed hTLR4 in different states.

Main Results:

MD-2 complexation stabilizes the terminal regions of hTLR4.
Identified conserved residues critical for hTLR4-MD-2 interaction dynamics.
Disclosed C-terminal motions potentially linked to signaling upon oligomerization.

Conclusions:

MD-2 binding significantly influences hTLR4 dynamics, stabilizing its structure.
Specific residues and C-terminal movements are identified as key players in LPS recognition and downstream signaling.