Receptor-binding domain of the SARS-CoV-2 spike protein attached to the human ACE2 receptor: the first molecular contact of infection.

Scientifically accurate model built directly from the experimental atomic coordinates of Protein Data Bank entry 6M0J (X-ray crystallography, 2.45 angstrom resolution), biological assembly 1. Source organism: Homo sapiens, Severe acute respiratory syndrome coronavirus 2. Only atoms that were resolved in the experiment are represented; nothing has been added or invented.

MODEL
- Molecular surface of every chain as a separate, named object (2 chains, 2 distinct components)
- Surface glycans (sugar chains) as separate objects
- Bound ligands, cofactors and metal ions as separate ball-and-stick objects (ZN; PDB component codes)
- 84,660 polygons, 84,668 vertices; all quads
- All surface meshes closed and manifold (no holes)
- One Principled BSDF material per component; no textures needed
- 1 unit = 1 nanometer; centred at the origin; objects grouped under one parent

FORMATS
- Blender 4.0 (.blend), native, with studio lighting and camera (Cycles)
- FBX (.fbx)
- OBJ (.obj + .mtl)
- glTF 2.0 binary (.glb)
- USD (.usdc)
- STL (.stl), geometry only

Structure reference: PDB 6M0J; Lan et al., Nature, 2020. PDB structure data are in the public domain (CC0 1.0).