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► Thompson, M. C., Barad, B. A., Wolff, A. M., Cho, H. S., Schotte, F., Schwarz, D. M. C., Anfinrud, P., and Fraser, J. S. (2019) Temperature-jump solution X-ray scattering reveals distinct motions in a dynamic enzyme. Nat. Chem. 11, 1058–1066.
► Rimmerman, D., Leshchev, D., Hsu, D. J., Hong, J., Abraham, B., Henning, R., Kosheleva, I., and Chen, L. X. (2019) Revealing Fast Structural Dynamics in pH-Responsive Peptides with Time-Resolved X-ray Scattering. J. Phys. Chem. B 123, 2016–2021.
► Martin-Garcia, J. M., Zhu, L., Mendez, D., Lee, M.-Y., Chun, E., Li, C., Hu, H., Subramanian, G., Kissick, D., Ogata, C., Henning, R., Ishchenko, A., Dobson, Z., Zhang, S., Weierstall, U., Spence, J. C. H., Fromme, P., Zatsepin, N. A., Fischetti, R. F., Cherezov, V., and Liu, W. (2019) High-viscosity injector-based pink-beam serial crystallography of microcrystals at a synchrotron radiation source. IUCrJ 6, 412–425.
► Hsu, D. J., Leshchev, D., Rimmerman, D., Hong, J., Kelley, M. S., Kosheleva, I., Zhang, X., and Chen, L. X. (2019) X-ray snapshots reveal conformational influence on active site ligation during metalloprotein folding. Chem. Sci. 10, 9788–9800.
► Berntsson, O., Rodriguez, R., Henry, L., Panman, M. R., Hughes, A. J., Einholz, C., Weber, S., Ihalainen, J. A., Henning, R., Kosheleva, I., Schleicher, E., and Westenhoff, S. (2019) Photoactivation of Drosophila melanogaster cryptochrome through sequential conformational transitions. Science Advances 5, eaaw1531.
► Cho, H. S., Schotte, F., Stadnytskyi, V., DiChiara, A., Henning, R. W., and Anfinrud, P. (2018) Dynamics of Quaternary Structure Transitions in R-State Carbonmonoxyhemoglobin are Unveiled in Time-Resolved X-ray Scattering Patterns Following a Temperature Jump. J. Phys. Chem. B.
► Davis, K. M., Sullivan, B. T., Palenik, M. C., Yan, L., Purohit, V., Robison, G., Kosheleva, I., Henning, R. W., Seidler, G. T., and Pushkar, Y. (2018) Rapid Evolution of the Photosystem II Electronic Structure during Water Splitting. Phys. Rev. X 8, 041014.
BioCARS is a national user facility for synchrotron-based, dynamic studies in structural biology, located at Sector 14 of the Advanced Photon Source, at Argonne National Laboratory. BioCARS is an integral part of the multi-disciplinary Center for Advanced Radiation Sources (CARS) run by the University of Chicago.
The mission of BioCARS is to provide state-of-the-art X-ray facility, scientific and technical expertise and support to enable users to study the dynamic properties of biological macromolecules by X-ray scattering techniques: time-resolved diffraction and solution scattering (SAXS/WAXS). In hybrid mode of the APS storage ring, BioCARS 14-ID beamline provides high polychromatic flux, with a number of photons per 100ps pulse approaching that of free electron lasers (such as the LCLS). Short X-ray pulses are synchronized with ps or ns laser pulses for conducting pump-probe time-resolved experiments. Laser pulses are used to initiate reactions in naturally photo-sensitive proteins or in other proteins that can be used with a suitable caged compound, and to initiate temperature or pH jumps. We are currently developing methods and technology for serial Laue micro-crystallography in order to facilitate studies of irreversible reactions while minimizing sample consumption. Another exciting field we are focusing on is the development of electric-field jump as a method for reaction initiation and studies of protein dynamics. The overall goal of time-resolved experiments our users conduct is to understand basic biological processes in structural and dynamics terms, on time scales from 100 picoseconds to seconds.
BioCARS operates two Experimental Stations, embedded in a Biosafety Level 3 (BSL-3) Facility. This BSL-3 synchrotron-based capability is unique in the United States and permits safe studies of biohazardous materials such as pathogenic human viruses.
*As of February 6, 2017, BioCARS facility is decommissioned as a BSL-3 laboratory. BioCARS is now approved for research up to the BSL-2 level.
Latest News and Highlights
High-viscosity injector-based pink-beam serial crystallography of microcrystals at a synchrotron radiation source
(May 1, 2019) Since the first successful serial crystallography (SX) experiment at a synchrotron radiation source, the popularity of this approach has continued to grow showing that third-generation synchrotrons can be viable alternatives to scarce X-ray free-electron laser sources.
Science Careers in Search of Women Conference, Tour of BioCARS
(April 4, 2019) As in previous years, BioCARS participated again in the ANL-hosted annual Science Careers in Search of Women Conference this year (Click here for more).
Crystal-on-crystal chips for in situ serial diffraction at room temperature
(June 20, 2018) Recent developments in serial crystallography at X-ray free electron lasers (XFELs) and synchrotrons have been driven by two scientific goals in structural biology – first, static structure determination from nano or microcrystals of membrane proteins and large complexes that are difficult for conventional cryocrystallography, and second, direct observations of transient structural species in biochemical reactions at near atomic resolution.
New BioCARS Director, Prof. Rama Ranganathan
(December 2017) Distinguished biophysicist Rama Ranganathan joined University of Chicago as a professor in the Department of Biochemistry and Molecular Biology and Institute for Molecular Engineering. He is the new Director of BioCARS facility and will also lead the new Center for Physics of Evolving Systems at the University of Chicago.
Temperature-jump solution X-ray scattering reveals distinct motions in a dynamic enzyme
September 16, 2019
Correlated motions of proteins are critical to function, but these features are difficult to resolve using traditional structure determination techniques. Time-resolved X-ray methods hold promise for addressing this challenge, but have relied on the exploitation of exotic protein photoactivity, and are therefore not generalizable. Temperature jumps, through thermal excitation of the solvent, have been utilized to study protein dynamics using spectroscopic techniques, but their implementation in X-ray scattering experiments has been limited. Here, we perform temperature-jump small- and wide-angle X-ray scattering measurements on a dynamic enzyme, cyclophilin A, demonstrating that these experiments are able to capture functional intramolecular protein dynamics on the microsecond timescale. We show that cyclophilin A displays rich dynamics following a temperature jump, and use the resulting time-resolved signal to assess the kinetics of conformational changes. Two relaxation processes are resolved: a fast process is related to surface loop motions, and a slower process is related to motions in the core of the protein that are critical for catalytic turnover.