Beom Seok Park is a researcher credited with structural studies of recognition in innate immunity. He was first author of the 2009 study of the Toll-like receptor 4–MD-2 complex with lipopolysaccharide; the original paper records his Department of Chemistry affiliation at KAIST.[ref]
The structural basis of lipopolysaccharide recognition by the TLR4–MD-2 complex by Beom Seok Park and others. Author byline and affiliation; Nature 458, 1191–1195
The crystal structure connected ligand recognition to assembly. Most of the lipopolysaccharide's lipid chains fit inside a pocket in MD-2, while an exposed chain helps make an interface with another Toll-like receptor 4. The assembly contains two receptor-complex units. Thus the ligand helps organize contacts between proteins, rather than merely occupying an isolated binding pocket.[ref]
The structural basis of lipopolysaccharide recognition by the TLR4–MD-2 complex by Beom Seok Park and others. Abstract; Figures 1–3, ligand pocket and dimerization interfaces
A simple comparison shows why this matters. Imagine two ligands that both bind a receptor-associated pocket, but only one presents an exposed surface in the orientation required to join two receptor units. Equal pocket occupancy would not guarantee equal assembly or signaling. This is a conceptual example, not a numerical affinity measurement from the paper.
Park and collaborators' contribution was to provide a molecular account linking the arrangement of lipopolysaccharide, MD-2 and Toll-like receptor 4 to receptor activation. A crystal structure reveals the contacts in the captured complex; claims about response strength or behavior in an intact organism require further experimental measurements.[ref]
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