TY - JOUR T1 - Hydration Effects on Energy Relaxation of Ferric Cytochrome C Films after Soret-Band Photoexcitation JF - Journal of Physical Chemistry B Y1 - 2010 A1 - Ye, S. J. A1 - Markelz, A. KW - Chemistry KW - circular-dichroism KW - conformation change KW - dynamics KW - ferricytochrome-c KW - protein hydration KW - resolved resonance raman KW - spectroscopy KW - unfolded states KW - vibrational-relaxation KW - water-molecules AB -

Protein hydration plays a critical role in protein dynamics and biological processes. Pump-probe transmission measurement has been applied to investigate the hydration effects on the energy relaxation of a heme protein ferric Cytochrome c (Cyt c) film after soret-band photoexcitation. Transient dynamics study indicates that the energy internal conversion time of similar to 300 fs is independent of hydration. The vibrationally excited electronic ground-state recovery rates show two transitions at the hydration level of h = 12.4-16.5% and 21.7-23.5%. The first transition occurs at the hydration level for the onset of an increasing ferric Cyt c flexibility while the second transition occurs at the saturated hydration level. The hydration dependence of steady-state electronic absorption spectrum results shows that the Q-band peak is nearly constant in center wavelength, but the line width surprisingly narrows with increasing hydration. For the similar to 695 nm absorbance associated with the MET80-Fe bond, the intensity increases with increasing hydration and slightly blue shifts. The 695 nm peak grows rapidly at h = 12.4% and then plateaus at h = 21.7%. This research shows that similar to 695 nm absorbance and ground-state recovery rates are sensitive to the hydration of the protein. This study will aid in understanding how hydration modulates the activity of the protein dynamics at a local level.

VL - 114 SN - 1520-6106 N1 - ISI Document Delivery No.: 681CT
Times Cited: 3
Cited Reference Count: 87
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Ye, Shuji Markelz, Andrea
Ye, Shuji/B-4479-2010
Markelz, Andrea/0000-0003-0443-4319
NSFNational Science Foundation (NSF) [PHY-0349256, DBI-2959989]; University of Science and Technology of China; Fundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central Universities; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21073175]; National Basic Research Program of ChinaNational Basic Research Program of China [2010CB923300]
This work was supported by NSF CAREER Grant PHY-0349256 and NSF MRI-R2 Grant DBI-2959989, the start-up funding from University of Science and Technology of China, the Fundamental Research Funds for the Central Universities, National Natural Science Foundation of China (Grant 21073175), and National Basic Research Program of China (Grant 2010CB923300).
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