title: Polyoma virus capsid structure at 22.5 A resolution.
abstract: X-ray diffraction data from polyoma capsid crystals were phased by refinement of low-resolution starting models to obtain a self-consistent structural solution. The unexpected result that the hexavalent morphological unit is a pentamer shows that specificity of bonding is not conserved among the protein subunits in the icosahedrally symmetric capsid.
mesh_terms: D002213:Capsid; D005583:Fourier Analysis; D046911:Macromolecular Substances; D008958:Models, Molecular; D011120:Polyomavirus / Q000648:ultrastructure*; D011487:Protein Conformation; D014764:Viral Proteins; D014961:X-Ray Diffraction
chemical_list: D046911:Macromolecular Substances; D014764:Viral Proteins