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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Chen, Jing Yin Knab, J. R. Markelz, A. G. Gregurick, S. K. |
| Copyright Year | 2007 |
| Description | Author affiliation: Physics Department, University at Buffalo, SUNY, Buffalo, NY 14260 (Chen, Jing Yin; Knab, J. R.; Markelz, A. G.) || Chemistry and Biochemistry Department, University of Maryland, Baltimore Campus, Baltimore, MD 21250 (Gregurick, S. K.) |
| Abstract | Previously we have shown that the terahertz dielectric response is sensitive to the oxidation state for cytochrome c (CytC) films. Here we discuss the origin of this sensitivity through hydration dependent measurements on films, solution phase measurements as a function of temperature and normal mode calculations as a function of hydration. We find that the hydration dependence of the terahertz response rapidly approaches its fully solvated value for ferri CytC, whereas for ferro CytC the effect of added water is more gradual, with the system not reaching fully hydrated values up to 0.5 gm water/gm protein. For solution phase samples below 270 K we do not see a significant difference in the terahertz response suggesting that the fully hydrated ferro cytochrome c has the same picosecond dynamics as ferri cytochrome c. These results contradict X-ray B factor measurements that suggest that ferri cytochrome c is significantly more flexible than ferro suggesting that the B-factor determination from X-ray crystal measurements may not represent in vivo values as crystal water is less than 0.5 gm water/gm protein. |
| Starting Page | 218 |
| Ending Page | 219 |
| File Size | 174363 |
| Page Count | 2 |
| File Format | |
| ISBN | 9781424409242 |
| ISSN | 10928081 |
| DOI | 10.1109/LEOS.2007.4382355 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2007-10-21 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Proteins Oxidation Dielectric measurements Neutrons Phase measurement In vivo Submillimeter wave measurements Atomic measurements Displacement measurement Vibration measurement |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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