title: Structural invariants in protein folding.
abstract: An analysis of 15 protein structures indicates: First, the loss of accessible surface area by monomeric proteins on folding-proportional to hydrophobic energy-is a simple function of molecular weight; second, the proportion of polar groups forming intramolecular hydrogen bonds is constant; and third, protein interiors are closely packed, each residue occupying the same volume as it does in crystals of amino acids.
mesh_terms: D000596:Amino Acids; D006859:Hydrogen; D008970:Molecular Weight; D011487:Protein Conformation; D014867:Water
chemical_list: D000596:Amino Acids; D014867:Water; D006859:Hydrogen