Structural and spectroscopic characterization of photoactive yellow protein and photoswitchable fluorescent protein constructs containing heavy atoms
Abstract
Photo-induced structural rearrangements of chromophore-containing proteins are essential for various light-dependent signaling pathways and optogenetic applications. Ultrafast structural and spectroscopic methods have offered insights into these structural rearrangements across many timescales. However, questions still remain about exact mechanistic details, especially regarding photoisomerization of the chromophore within these proteins femtoseconds to picoseconds after photoexcitation. Instrumentation advancements for time-resolved crystallography and ultrafast electron diffraction provide a promising opportunity to study these reactions, but achieving enough signal-to-noise is a constant challenge. In this work, we present four new photoactive yellow protein constructs and one new fluorescent protein construct that contain heavy atoms either within or around the chromophore and can be expressed with high yields. Structural characterization of these constructs, most at atomic resolution, show minimal perturbation caused by the heavy atoms compared to wild-type structures. Spectroscopic studies report the effects of the heavy atom identity and location on the chromophore’s photophysical properties. None of the substitutions prevent photoisomerization, although certain rates within the photocycle may be affected. Overall, these new proteins containing heavy atoms are ideal samples for state-of-the-art time-resolved crystallography and electron diffraction experiments to elucidate crucial mechanistic information of photoisomerization.
- Authors:
-
- Stanford Univ., CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Institutes of Health (NIH)
- OSTI Identifier:
- 1770137
- Grant/Contract Number:
- AC02-76SF00515; CHE-1740645; P41GM103393
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Photochemistry and Photobiology. A, Chemistry
- Additional Journal Information:
- Journal Volume: 401; Journal ID: ISSN 1010-6030
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Photoisomerization; photophysics; optogenetics; x-ray crystallography; noncanonical amino acid incorporation
Citation Formats
Romei, Matthew G., Lin, Chi-Yun, and Boxer, Steven G. Structural and spectroscopic characterization of photoactive yellow protein and photoswitchable fluorescent protein constructs containing heavy atoms. United States: N. p., 2020.
Web. doi:10.1016/j.jphotochem.2020.112738.
Romei, Matthew G., Lin, Chi-Yun, & Boxer, Steven G. Structural and spectroscopic characterization of photoactive yellow protein and photoswitchable fluorescent protein constructs containing heavy atoms. United States. https://doi.org/10.1016/j.jphotochem.2020.112738
Romei, Matthew G., Lin, Chi-Yun, and Boxer, Steven G. Tue .
"Structural and spectroscopic characterization of photoactive yellow protein and photoswitchable fluorescent protein constructs containing heavy atoms". United States. https://doi.org/10.1016/j.jphotochem.2020.112738. https://www.osti.gov/servlets/purl/1770137.
@article{osti_1770137,
title = {Structural and spectroscopic characterization of photoactive yellow protein and photoswitchable fluorescent protein constructs containing heavy atoms},
author = {Romei, Matthew G. and Lin, Chi-Yun and Boxer, Steven G.},
abstractNote = {Photo-induced structural rearrangements of chromophore-containing proteins are essential for various light-dependent signaling pathways and optogenetic applications. Ultrafast structural and spectroscopic methods have offered insights into these structural rearrangements across many timescales. However, questions still remain about exact mechanistic details, especially regarding photoisomerization of the chromophore within these proteins femtoseconds to picoseconds after photoexcitation. Instrumentation advancements for time-resolved crystallography and ultrafast electron diffraction provide a promising opportunity to study these reactions, but achieving enough signal-to-noise is a constant challenge. In this work, we present four new photoactive yellow protein constructs and one new fluorescent protein construct that contain heavy atoms either within or around the chromophore and can be expressed with high yields. Structural characterization of these constructs, most at atomic resolution, show minimal perturbation caused by the heavy atoms compared to wild-type structures. Spectroscopic studies report the effects of the heavy atom identity and location on the chromophore’s photophysical properties. None of the substitutions prevent photoisomerization, although certain rates within the photocycle may be affected. Overall, these new proteins containing heavy atoms are ideal samples for state-of-the-art time-resolved crystallography and electron diffraction experiments to elucidate crucial mechanistic information of photoisomerization.},
doi = {10.1016/j.jphotochem.2020.112738},
journal = {Journal of Photochemistry and Photobiology. A, Chemistry},
number = ,
volume = 401,
place = {United States},
year = {Tue Jun 30 00:00:00 EDT 2020},
month = {Tue Jun 30 00:00:00 EDT 2020}
}
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