@article {248, title = {Deuteration and Inhibitor Binding Dependence of Protein Collective Vibrations}, journal = {Biophysical Journal}, volume = {116}, number = {3}, year = {2019}, note = {ISI Document Delivery No.: HO2XG
Times Cited: 0
Cited Reference Count: 2
Cited References:
Mahajan S, 2015, ARCH BIOCHEM BIOPHYS, V567, P59, DOI 10.1016/j.abb.2014.12.020
Niessen KA, 2017, BIOPHYS J, V112, P933, DOI 10.1016/j.bpj.2016.12.049
Deng, Yanting Mckinney, Jeffrey Markelz, Andrea
63rd Annual Meeting of the Biophysical-Society
Mar 02-06, 2019
Baltimore, MD
Biophys Soc

8
Cell press
Cambridge
1542-0086
1}, month = {Feb}, pages = {488A-488A}, type = {Meeting Abstract}, keywords = {Biophysics}, isbn = {0006-3495}, doi = {10.1016/j.bpj.2018.11.2633}, author = {Deng, Y. T. and McKinney, J. and Markelz, A.} } @conference {546, title = {Direct Measurements of the Long-Range Collective Vibrations of Photoactive Yellow Protein}, booktitle = {30th Anniversary Symposium of The Protein Society}, year = {2016}, address = {Baltimore MD}, abstract = {

Long-range collective vibrations are thought to be crucial to protein functions. In the case of photoactive protein family, modeling suggests the intramolecular vibrations provide an efficient means of energy relaxation[1], feedback for enhancement of chromophore vibrations that promote structural transitions[2] and can assist in charge energy transfer[3]. As a paradigm of this family, photoactive yellow protein (PYP) is a cytoplasmic photocycling protein related to negative phototactic response to blue light in purple photosynthetic bacteria. PYP has a p-coumaric acid chromophore binding to the cysteine residue via a thioester bond, whose vibrations were found to overlap calculated vibrations of the protein scaffold. Using our unique technique of anisotropic terahertz microscopy(ATM)[4], we measure the intramolecular vibrations for PYP for the first time, including cycling between ground and blue shift (pB) states. Room temperature ATM measurements are performed in the dark and with continuous wave illumination at 488nm, resulting in a steady pB state with approximately 5\% population conversion. In pB state, we find an overall decrease in the strength of resonant band in frequency range of 30-60 cm-1. Our calculated spectra using quasi-harmonic analysis indicate that our measurements are dominated by the protein vibrations, rather than the pCA chromophore, allowing us to characterize how the scaffold dynamics changes with functional states and mutations.

1. Levantino, M., et al. Nat Commun, 2015. 6.

2. Mataga, N., et al. Chem. Phys. Lett., 2002. 352(3-4): p. 220-225.

3. Fokas, A.S., et al. Photosynth. Res., 2014. 122

}, doi = {10.1002/pro.3026}, url = {https://onlinelibrary.wiley.com/doi/10.1002/pro.3026}, author = {Deng, Yanting and Xu, Mengyang and Niessen, Katherine A. and Schmidt, Marius and Markelz, Andrea G.} } @inbook {303, title = {Development of Tagless Biosensors for Detecting the Presence of Pathogens}, booktitle = {Terahertz Frequency Detection and Identification of Materials and Objects}, volume = {ed X.-C. Zhang, R. E. Miles, H. Eisele and A. Krotkus}, year = {2007}, pages = {123-134}, publisher = {Springer}, organization = {Springer}, chapter = {9}, address = {Dordrecht, The Netherlands}, author = {Markelz, A. G. and Chen, J.-Y. and Knab, J. R. and He, Y. and Ye, S.} } @article {294, title = {Direct measurements of optical phonons in SrTiO3 nanosystems}, journal = {Physica E: Low-dimensional Systems and Nanostructures}, volume = {19}, year = {2003}, month = {2003/07/01/}, pages = {236 - 239}, abstract = {

We use terahertz time domain spectroscopy to examine finite size effects on the optical phonon modes in SrTiO3 thin films. In temperature-dependent measurements we find a near absence of mode softening in the TO1 phonon frequency. Furthermore we see an increase in the soft mode frequency with reduced thickness. Both of these results correlate well with the reduced dielectric response observed for nanoscale ferroelectric systems.

}, keywords = {Ferroelectrics, Finite size, Mode softening, phonons, Strontium titanate, Terahertz}, isbn = {1386-9477}, doi = {10.1016/S1386-9477(03)00305-9}, url = {https://www.sciencedirect.com/science/article/pii/S1386947703003059}, author = {Wolpert, D and Korolev, K and Sachs, S and Knab, J and Cox, W and Cerne, J and Markelz, A.G and Zhao, T and Ramesh, R and Moeckly, B.H} } @article {260, title = {DC TRANSPORT IN INTENSE, INPLANE TERAHERTZ ELECTRIC-FIELDS IN AL(X)GA(1-X)AS HETEROSTRUCTURES AT 300-K}, journal = {Solid-State Electronics}, volume = {37}, number = {4-6}, year = {1994}, note = {Markelz, Andrea/0000-0003-0443-4319
6th International Conference on Modulated Semiconductor Structures
Aug 23-27, 1993
Garmisch partenkir, germany
Tech univ munchen, walter schottky inst
1}, month = {Apr-Jun}, pages = {693-695}, abstract = {

We report 300 K studies of the dependence of the in-plane, d.c. conductivity, sigma(d.c.) (E(omega)), of a quasi 2D electron gas on the amplitude E(omega) and frequency of intense, far-infrared fields (omega/2pi = 0.24-3.5 THz). We measure sigma(d.c.) (E(omega) parallel-to E(d.c.)), where E(d.c.) is a small sensing field, and observe a monotonic decrease in sigma(d.c.) with increasing E(omega). Although a simple scaling ansatz collapses the measured sigma(d.c.) (E(omega)) data onto a single curve for frequencies from 0.25-3.45 THz (at low to moderate scaled fields), the decrease in conductivity is substantially more rapid than expected from comparison to similar data taken by Masselink et al. [Solid-St. Electron. 31, 337 (1988)] at 35 GHz. We tentatively attribute this difference to effects of a high-frequency modulation in the electron temperature.

}, isbn = {0038-1101}, doi = {10.1016/0038-1101(94)90278-X}, author = {Asmar, N. G. and Markelz, A. G. and Gwinn, E. G. and Hopkins, P. F. and Gossard, A. C.} }