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Persistent URL http://purl.org/net/epubs/work/42928
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Record Id 42928
Title Proton momentum distribution in a protein hydration shell
Abstract The momentum distribution of protons in the hydration shell of a globular protein has been measured through deep inelastic neutron scattering at 180 and 290 K, below and above the crossover temperature T c=1.23Tg, where Tg=219 K is the glass transition temperature. It is found that the mean kinetic energy of the water hydrogens shows no temperature dependence, but the measurements are accurate enough to indicate a sensible change of momentum distribution and effective potential felt by protons, compatible with the transition from a single to a double potential well. This could support the presence of tunneling effects even at room temperature, playing an important role in biological function.
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Language English (EN)
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Journal Article Phys Rev Lett 98, no. 13 (2007): 138102. doi:10.1103/PhysRevLett.98.138102 2007