Protein Dynamical Transition in Terahertz Dielectric Response

Details Protein Dynamical Transition in Terahertz Dielectric Response Protein Dynamical Transition in Terahertz Dielectric Response

2007-05-14

arxiv.org/abs/0705.2049v1

Physics

Biological Physics

Scientific paper

10.1016/j.cplett.2007.05.080

The 200 K protein dynamical transition is observed for the first time in the teraherz dielectric response. The complex dielectric permittivity $\epsilon$ = $\epsilon$' + i$\epsilon$" is determined in the 0.2 - 2.0 THz and 80-294 K ranges. $\epsilon$" has a linear temperature dependence up to 200 K then sharply increases. The low temperature linear dependence in $\epsilon$" indicates anharmonicity for temperatures 80 K < T < 180 K, challenging the assumed harmonicity below 200K. The temperature dependence is consistent with beta relaxation response and shows the protein motions involved in the dynamical transition extend to subpicosecond time scales.

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