Towards the spatial resolution of metalloprotein charge states by detailed modeling of XFEL crystallographic diffraction
Abstract
Oxidation states of individual metal atoms within a metalloprotein can be assigned by examining X-ray absorption edges, which shift to higher energy for progressively more positive valence numbers. Indeed, X-ray crystallography is well suited for such a measurement, owing to its ability to spatially resolve the scattering contributions of individual metal atoms that have distinct electronic environments contributing to protein function. However, as the magnitude of the shift is quite small, about +2 eV per valence state for iron, it has only been possible to measure the effect when performed with monochromated X-ray sources at synchrotron facilities with energy resolutions in the range 2–3 × 10-4 (ΔE/E). This paper tests whether X-ray free-electron laser (XFEL) pulses, which have a broader bandpass (ΔE/E = 3 × 10-3) when used without a monochromator, might also be useful for such studies. The program nanoBragg is used to simulate serial femtosecond crystallography (SFX) diffraction images with sufficient granularity to model the XFEL spectrum, the crystal mosaicity and the wavelength-dependent anomalous scattering factors contributed by two differently charged iron centers in the 110-amino-acid protein, ferredoxin. Bayesian methods are then used to deduce, from the simulated data, the most likely X-ray absorption curves for each metalmore »
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institutes of Health (NIH); National Institute of General Medical Sciences
- OSTI Identifier:
- 1617958
- Alternate Identifier(s):
- OSTI ID: 1615300; OSTI ID: 1638258
- Grant/Contract Number:
- AC02-05CH11231; AC02-76SF00515; GM117126; GM124149; GM124169; GM126289; GM103393; GM082250; GM110501; DBI 1625906; 17-SC-20-SC
- Resource Type:
- Published Article
- Journal Name:
- Acta Crystallographica. Section D. Structural Biology
- Additional Journal Information:
- Journal Name: Acta Crystallographica. Section D. Structural Biology Journal Volume: 76 Journal Issue: 2; Journal ID: ISSN 2059-7983
- Publisher:
- IUCr
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; metalloproteins; SPREAD; valence; Bayesian methods; XFEL; spectroscopy
Citation Formats
Sauter, Nicholas K., Kern, Jan, Yano, Junko, and Holton, James M. Towards the spatial resolution of metalloprotein charge states by detailed modeling of XFEL crystallographic diffraction. United Kingdom: N. p., 2020.
Web. doi:10.1107/S2059798320000418.
Sauter, Nicholas K., Kern, Jan, Yano, Junko, & Holton, James M. Towards the spatial resolution of metalloprotein charge states by detailed modeling of XFEL crystallographic diffraction. United Kingdom. https://doi.org/10.1107/S2059798320000418
Sauter, Nicholas K., Kern, Jan, Yano, Junko, and Holton, James M. Tue .
"Towards the spatial resolution of metalloprotein charge states by detailed modeling of XFEL crystallographic diffraction". United Kingdom. https://doi.org/10.1107/S2059798320000418.
@article{osti_1617958,
title = {Towards the spatial resolution of metalloprotein charge states by detailed modeling of XFEL crystallographic diffraction},
author = {Sauter, Nicholas K. and Kern, Jan and Yano, Junko and Holton, James M.},
abstractNote = {Oxidation states of individual metal atoms within a metalloprotein can be assigned by examining X-ray absorption edges, which shift to higher energy for progressively more positive valence numbers. Indeed, X-ray crystallography is well suited for such a measurement, owing to its ability to spatially resolve the scattering contributions of individual metal atoms that have distinct electronic environments contributing to protein function. However, as the magnitude of the shift is quite small, about +2 eV per valence state for iron, it has only been possible to measure the effect when performed with monochromated X-ray sources at synchrotron facilities with energy resolutions in the range 2–3 × 10-4 (ΔE/E). This paper tests whether X-ray free-electron laser (XFEL) pulses, which have a broader bandpass (ΔE/E = 3 × 10-3) when used without a monochromator, might also be useful for such studies. The program nanoBragg is used to simulate serial femtosecond crystallography (SFX) diffraction images with sufficient granularity to model the XFEL spectrum, the crystal mosaicity and the wavelength-dependent anomalous scattering factors contributed by two differently charged iron centers in the 110-amino-acid protein, ferredoxin. Bayesian methods are then used to deduce, from the simulated data, the most likely X-ray absorption curves for each metal atom in the protein, which agree well with the curves chosen for the simulation. The data analysis relies critically on the ability to measure the incident spectrum for each pulse, and also on the nanoBragg simulator to predict the size, shape and intensity profile of Bragg spots based on an underlying physical model that includes the absorption curves, which are then modified to produce the best agreement with the simulated data. This inference methodology potentially enables the use of SFX diffraction for the study of metalloenzyme mechanisms and, in general, offers a more detailed approach to Bragg spot data reduction.},
doi = {10.1107/S2059798320000418},
journal = {Acta Crystallographica. Section D. Structural Biology},
number = 2,
volume = 76,
place = {United Kingdom},
year = {2020},
month = {2}
}
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