  Quantum mechanical calculations are performed on 116 conformers of the
protein ubiquitin (Lange et al., Science 2008, 320, 1471-1475). The results
indicate that the heat of formation (HOF), dipole moment, energy of the
frontier orbitals HOMO and LUMO, and HOMO-LUMO gap fluctuate within their
corresponding ranges. This study thus provides a link between the
conformational dynamics of a protein and its electronic structure.
