Conductivity in hydrated proteins: No signs of the fragile-to-strong crossover

被引：89

作者：

Pawlus, S. ^{[1
]}

Khodadadi, S. ^{[1
]}

Sokolov, A. P. ^{[1
]}

机构：

[1] Univ Akron, Dept Polymer Sci, Akron, OH 44321 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.100.108103

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Dielectric spectroscopy studies of hydrated protein demonstrate smooth temperature variations of conductivity. This observation suggests no cusplike fragile-to-strong crossover (FSC) in the protein's hydration water. The FSC at T similar to 220 K was postulated recently on the basis of neutron scattering studies [Chen , Proc. Natl. Acad. Sci. U.S.A. 103, 9012 (2006)] and was proposed to be the main cause for the dynamic transition in hydrated proteins. Following Swenson et al. 6,9, we ascribe the neutron results to a secondary relaxation. We emphasize that no cusplike solvent behavior is required for the protein's dynamic transition.

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页数：4

相关论文

共 28 条

[1] Dynamics of supercooled water in confined geometry [J].

Bergman, R ;

Swenson, J .

NATURE, 2000, 403 (6767) :283-286

[2] Dynamic transition in tRNA is solvent induced [J].

Caliskan, G ;

Briber, RM ;

Thirumalai, D ;

Garcia-Sakai, V ;

Woodson, SA ;

Sokolov, AP .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2006, 128 (01) :32-33

[3] Glass transition and relaxation processes in supercooled water [J].

Cerveny, S ;

Schwartz, GA ;

Bergman, R ;

Swenson, J .

PHYSICAL REVIEW LETTERS, 2004, 93 (24)

[4] Experimental evidence of fragile-to-strong dynamic crossover in DNA hydration water [J].

Chen, S. -H. ;

Liu, L. ;

Chu, X. ;

Zhang, Y. ;

Fratini, E. ;

Baglioni, P. ;

Faraone, A. ;

Mamontov, E. .

JOURNAL OF CHEMICAL PHYSICS, 2006, 125 (17)

[5] Observation of fragile-to-strong dynamic crossover in protein hydration water [J].

Chen, S. -H. ;

Liu, L. ;

Fratini, E. ;

Baglioni, Piero ;

Faraone, A. ;

Mamontov, E. .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2006, 103 (24) :9012-9016

[6] The violation of the Stokes-Einstein relation in supercooled water [J].

Chen, Sow-Hsin ;

Mallamace, Francesco ;

Mou, Chung-Yuan ;

Broccio, Matteo ;

Corsaro, Carmelo ;

Faraone, Antonio ;

Liu, Li .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2006, 103 (35) :12974-12978

[7] Enzyme dynamics and activity:: Time-scale dependence of dynamical transitions in glutamate dehydrogenase solution [J].

Daniel, RM ;

Finney, JL ;

Réat, V ;

Dunn, R ;

Ferrand, M ;

Smith, JC .

BIOPHYSICAL JOURNAL, 1999, 77 (04) :2184-2190

[8] DYNAMICAL TRANSITION OF MYOGLOBIN REVEALED BY INELASTIC NEUTRON-SCATTERING [J].

DOSTER, W ;

CUSACK, S ;

PETRY, W .

NATURE, 1989, 337 (6209) :754-756

[9]

Egelstaff P.A., 1992, INTRO LIQUID STATE

[10] Slaving: Solvent fluctuations dominate protein dynamics and functions [J].

Fenimore, PW ;

Frauenfelder, H ;

McMahon, BH ;

Parak, FG .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2002, 99 (25) :16047-16051