TEM-1 beta-lactamase, the bacterial enzyme that destroys penicillin-type antibiotics and a leading cause of antibiotic resistance.

Scientifically accurate model built directly from the experimental atomic coordinates of Protein Data Bank entry 1BTL (X-ray crystallography, 1.80 angstrom resolution), biological assembly 1. Source organism: Escherichia coli. Only atoms that were resolved in the experiment are represented; nothing has been added or invented.

MODEL
- Molecular surface as one closed mesh
- 64,400 polygons, 64,402 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 1BTL; Jelsch et al., Proteins, 1993. PDB structure data are in the public domain (CC0 1.0).