@article {273, title = {Protein flexibility and conformational state: A comparison of collective vibrational modes of wild-type and D96N bacteriorhodopsin}, journal = {Biophysical Journal}, volume = {85}, number = {2}, year = {2003}, note = {ISI Document Delivery No.: 705ZZ
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Whitmire, SE Wolpert, D Markelz, AG Hillebrecht, JR Galan, J Birge, RR
Markelz, Andrea/0000-0003-0443-4319
NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCESUnited States Department of Health \& Human ServicesNational Institutes of Health (NIH) - USANIH National Institute of General Medical Sciences (NIGMS) [R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548, R01GM034548] Funding Source: NIH RePORTER; NIGMS NIH HHSUnited States Department of Health \& Human ServicesNational Institutes of Health (NIH) - USANIH National Institute of General Medical Sciences (NIGMS) [R01 GM034548, R01 GM034548-15] Funding Source: Medline
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1542-0086}, month = {Aug}, pages = {1269-1277}, type = {Article}, abstract = {

Far infrared ( FIR) spectral measurements of wild-type (WT) and D96N mutant bacteriorhodopsin thin films have been carried out using terahertz time domain spectroscopy as a function of hydration, temperature, and conformational state. The results are compared to calculated spectra generated via normal mode analyses using CHARMM. We find that the FIR absorbance is slowly increasing with frequency and without strong narrow features over the range of 2-60 cm(-1) and up to a resolution of 0.17 cm(-1). The broad absorption shifts in frequency with decreasing temperature as expected with a strongly anharmonic potential and in agreement with neutron inelastic scattering results. Decreasing hydration shifts the absorption to higher frequencies, possibly resulting from decreased coupling mediated by the interior water molecules. Ground-state FIR absorbances have nearly identical frequency dependence, with the mutant having less optical density than the WT. In the M state, the FIR absorbance of the WT increases whereas there is no change for D96N. These results represent the first measurement of FIR absorbance change as a function of conformational state.

}, keywords = {angstrom resolution, Biophysics, dna, films, frequency, harmonic-analysis, inelastic neutron-scattering, large systems, mixed basis, normal-modes, purple membranes, structural-changes, transform infrared-spectroscopy}, isbn = {0006-3495}, doi = {10.1016/S0006-3495(03)74562-7}, author = {Whitmire, S. E. and Wolpert, D. and Markelz, A. G. and Hillebrecht, J. R. and Galan, J. and Birge, R. R.} }