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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/42928
Record Status
Checked
Record Id
42928
Title
Proton momentum distribution in a protein hydration shell
Contributors
R Senesi (STFC Rutherford Appleton Lab.)
,
A Pietropaolo
,
SE Apgnotta
,
F Bruni
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.
Organisation
CCLRC
,
ISIS
,
ISIS-VESUVIO
Keywords
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Language
English (EN)
Type
Details
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Year
Journal Article
Phys Rev Lett
98, no. 13 (2007): 138102.
doi:10.1103/PhysRevLett.98.138102
2007
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