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Do TN, Menendez D, Bizhga D, Stojković EA, Kennis JTM. Two-photon Absorption and Photoionization of a Bacterial Phytochrome. J Mol Biol 2024; 436:168357. [PMID: 37944794 DOI: 10.1016/j.jmb.2023.168357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 10/19/2023] [Accepted: 11/02/2023] [Indexed: 11/12/2023]
Abstract
Phytochromes constitute a family of photosensory proteins that are utilized by various organisms to regulate several physiological processes. Phytochromes bind a bilin pigment that switches its isomeric state upon absorption of red or far-red photons, resulting in protein conformational changes that are sensed by the organism. Previously, the ultrafast dynamics in bacterial phytochrome was resolved to atomic resolution by time-resolved serial femtosecond X-ray diffraction (TR-SFX), showing extensive changes in its molecular conformation at 1 picosecond delay time. However, the large excitation fluence of mJ/mm2 used in TR-SFX questions the validity of the observed dynamics. In this work, we present an excitation-dependent ultrafast transient absorption study to test the response of a related bacterial phytochrome to excitation fluence. We observe excitation power-dependent sub-picosecond dynamics, assigned to the population of high-lying excited state Sn through resonantly enhanced two-photon absorption, followed by rapid internal conversion to the low-lying S1 state. Inspection of the long-lived spectrum under high fluence shows that in addition to the primary intermediate Lumi-R, spectroscopic signatures of solvated electrons and ionized chromophore radicals are observed. Supported by numerical modelling, we propose that under excitation fluences of tens of μJ/mm2 and higher, bacterial phytochrome partly undergoes photoionization from the Sn state in competition with internal conversion to the S1 state in 300 fs. We suggest that the extensive structural changes of related, shorter bacterial phytochrome, lacking the PHY domain, resolved from TR-SFX may have been affected by the ionized species. We propose approaches to minimize the two-photon absorption process by tuning the excitation spectrum away from the S1 absorption or using phytochromes exhibiting minimized or shifted S1 absorption.
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Affiliation(s)
- Thanh Nhut Do
- Department of Physics and Astronomy, Faculty of Science, Vrije Universiteit Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - David Menendez
- Department of Biology, Northeastern Illinois University, 5500 N. St. Louis Ave., Chicago, IL 60625, USA
| | - Dorina Bizhga
- Department of Biology, Northeastern Illinois University, 5500 N. St. Louis Ave., Chicago, IL 60625, USA
| | - Emina A Stojković
- Department of Biology, Northeastern Illinois University, 5500 N. St. Louis Ave., Chicago, IL 60625, USA
| | - John T M Kennis
- Department of Physics and Astronomy, Faculty of Science, Vrije Universiteit Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.
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2
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Schmidt M, Stojković EA. Blue and red in the protein world: Photoactive yellow protein and phytochromes as revealed by time-resolved crystallography. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2024; 11:014701. [PMID: 38304445 PMCID: PMC10834066 DOI: 10.1063/4.0000233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Accepted: 01/10/2024] [Indexed: 02/03/2024]
Abstract
Time-resolved crystallography (TRX) is a method designed to investigate functional motions of biological macromolecules on all time scales. Originally a synchrotron-based method, TRX is enabled by the development of TR Laue crystallography (TRLX). TR serial crystallography (TR-SX) is an extension of TRLX. As the foundations of TRLX were evolving from the late 1980s to the turn of the millennium, TR-SX has been inspired by the development of Free Electron Lasers for hard X-rays. Extremely intense, ultrashort x-ray pulses could probe micro and nanocrystals, but at the same time, they inflicted radiation damage that necessitated the replacement by a new crystal. Consequently, a large number of microcrystals are exposed to X-rays one by one in a serial fashion. With TR-SX methods, one of the largest obstacles of previous approaches, namely, the unsurmountable challenges associated with the investigation of non-cyclic (irreversible) reactions, can be overcome. This article describes successes and transformative contributions to the TRX field by Keith Moffat and his collaborators, highlighting two major projects on protein photoreceptors initiated in the Moffat lab at the turn of the millennium.
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Affiliation(s)
- Marius Schmidt
- Physics Department, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave., Milwaukee, Wisconsin 53211, USA
| | - Emina A. Stojković
- Department of Biology, Northeastern Illinois University, 5500 N. St. Louis Ave., Chicago, Illinois 60625, USA
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3
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Fischer T, Köhler L, Engel PD, Song C, Gärtner W, Wachtveitl J, Slavov C. Conserved tyrosine in phytochromes controls the photodynamics through steric demand and hydrogen bonding capabilities. BIOCHIMICA ET BIOPHYSICA ACTA. BIOENERGETICS 2023; 1864:148996. [PMID: 37437858 DOI: 10.1016/j.bbabio.2023.148996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 06/02/2023] [Accepted: 07/06/2023] [Indexed: 07/14/2023]
Abstract
Using ultrafast spectroscopy and site-specific mutagenesis, we demonstrate the central role of a conserved tyrosine within the chromophore binding pocket in the forward (Pr → Pfr) photoconversion of phytochromes. Taking GAF1 of the knotless phytochrome All2699g1 from Nostoc as representative member of phytochromes, it was found that the mutations have no influence on the early (<30 ps) dynamics associated with conformational changes of the chromophore in the excited state. Conversely, they drastically impact the extended protein-controlled excited state decay (>100 ps). Thus, the steric demand, position and H-bonding capabilities of the identified tyrosine control the chromophore photoisomerization while leaving the excited state chromophore dynamics unaffected. In effect, this residue operates as an isomerization-steric-gate that tunes the excited state lifetime and the photoreaction efficiency by modulating the available space of the chromophore and by stabilizing the primary intermediate Lumi-R. Understanding the role of such a conserved structural element sheds light on a key aspect of phytochrome functionality and provides a basis for rational design of optimized photoreceptors for biotechnological applications.
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Affiliation(s)
- Tobias Fischer
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt am Main, Max-von-Laue-Straße 7, 60438 Frankfurt, Germany.
| | - Lisa Köhler
- Institute for Analytical Chemistry, University of Leipzig, Linnéstraße 3, 04103 Leipzig, Germany.
| | - Philipp D Engel
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt am Main, Max-von-Laue-Straße 7, 60438 Frankfurt, Germany.
| | - Chen Song
- Institute for Analytical Chemistry, University of Leipzig, Linnéstraße 3, 04103 Leipzig, Germany.
| | - Wolfgang Gärtner
- Institute for Analytical Chemistry, University of Leipzig, Linnéstraße 3, 04103 Leipzig, Germany.
| | - Josef Wachtveitl
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt am Main, Max-von-Laue-Straße 7, 60438 Frankfurt, Germany.
| | - Chavdar Slavov
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt am Main, Max-von-Laue-Straße 7, 60438 Frankfurt, Germany; Department of Chemistry, University of South Florida, 4202 E. Fowler Avenue, 33620 Tampa, United States of America.
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4
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Protein control of photochemistry and transient intermediates in phytochromes. Nat Commun 2022; 13:6838. [PMID: 36369284 PMCID: PMC9652276 DOI: 10.1038/s41467-022-34640-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 11/01/2022] [Indexed: 11/13/2022] Open
Abstract
Phytochromes are ubiquitous photoreceptors responsible for sensing light in plants, fungi and bacteria. Their photoactivation is initiated by the photoisomerization of the embedded chromophore, triggering large conformational changes in the protein. Despite numerous experimental and computational studies, the role of chromophore-protein interactions in controlling the mechanism and timescale of the process remains elusive. Here, we combine nonadiabatic surface hopping trajectories and adiabatic molecular dynamics simulations to reveal the molecular details of such control for the Deinococcus radiodurans bacteriophytochrome. Our simulations reveal that chromophore photoisomerization proceeds through a hula-twist mechanism whose kinetics is mainly determined by the hydrogen bond of the chromophore with a close-by histidine. The resulting photoproduct relaxes to an early intermediate stabilized by a tyrosine, and finally evolves into a late intermediate, featuring a more disordered binding pocket and a weakening of the aspartate-to-arginine salt-bridge interaction, whose cleavage is essential to interconvert the phytochrome to the active state.
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5
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Conserved histidine and tyrosine determine spectral responses through the water network in Deinococcus radiodurans phytochrome. PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES : OFFICIAL JOURNAL OF THE EUROPEAN PHOTOCHEMISTRY ASSOCIATION AND THE EUROPEAN SOCIETY FOR PHOTOBIOLOGY 2022; 21:1975-1989. [PMID: 35906527 DOI: 10.1007/s43630-022-00272-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 07/12/2022] [Indexed: 10/16/2022]
Abstract
Phytochromes are red light-sensing photoreceptor proteins that bind a bilin chromophore. Here, we investigate the role of a conserved histidine (H260) and tyrosine (Y263) in the chromophore-binding domain (CBD) of Deinococcus radiodurans phytochrome (DrBphP). Using crystallography, we show that in the H260A variant, the missing imidazole side chain leads to increased water content in the binding pocket. On the other hand, Y263F mutation reduces the water occupancy around the chromophore. Together, these changes in water coordination alter the protonation and spectroscopic properties of the biliverdin. These results pinpoint the importance of this conserved histidine and tyrosine, and the related water network, for the function and applications of phytochromes.
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6
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Kraskov A, Buhrke D, Scheerer P, Shaef I, Sanchez JC, Carrillo M, Noda M, Feliz D, Stojković EA, Hildebrandt P. On the Role of the Conserved Histidine at the Chromophore Isomerization Site in Phytochromes. J Phys Chem B 2021; 125:13696-13709. [PMID: 34843240 DOI: 10.1021/acs.jpcb.1c08245] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Phytochromes are sensory photoreceptors that use light to drive protein structural changes, which in turn trigger physiological reaction cascades. The process starts with a double-bond photoisomerization of the linear methine-bridged tetrapyrrole chromophore in the photosensory core module. The molecular mechanism of the photoconversion depends on the structural and electrostatic properties of the chromophore environment, which are highly conserved in related phytochromes. However, the specific role of individual amino acids is yet not clear. A histidine in the vicinity of the isomerization site is highly conserved and almost invariant among all phytochromes. The present study aimed at analyzing its role by taking advantage of a myxobacterial phytochrome SaBphP1 from Stigmatella aurantiaca, where this histidine is naturally substituted with a threonine (Thr289), and comparing it to its normal, His-containing counterpart from the same organism SaBphP2 (His275). We have carried out a detailed resonance Raman and IR spectroscopic investigation of the wild-type proteins and their respective His- or Thr-substituted variants (SaBphP1-T289H and SaBphP2-H275T) using the well-characterized prototypical phytochrome Agp1 from Agrobacterium fabrum as a reference. The overall mechanism of the photoconversion is insensitive toward the His substitution. However, the chromophore geometry at the isomerization site appears to be affected, with a slightly stronger twist of ring D in the presence of Thr, which is sufficient to cause different light absorption properties in SaBphP1 and SaBphP2. Furthermore, the presence of His allows for multiple hydrogen-bonding interactions with the ring D carbonyl which may be the origin for the geometric differences of the C-D methine bridge compared to the Thr-containing variants. Other structural and mechanistic differences are independent of the presence of His. The most striking finding is the protonation of the ring C propionate in the Pfr states of SaBphP2, which is common among bathy phytochromes but so far has not been reported in prototypical phytochromes.
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Affiliation(s)
- Anastasia Kraskov
- Institut für Chemie, Technische Universität Berlin, Sekr. PC14, Straße des 17. Juni 135, D-10623 Berlin, Germany
| | - David Buhrke
- Institut für Chemie, Technische Universität Berlin, Sekr. PC14, Straße des 17. Juni 135, D-10623 Berlin, Germany
| | - Patrick Scheerer
- Charité─Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Medical Physics and Biophysics, Group Protein X-ray Crystallography and Signal Transduction, Charitéplatz 1, D-10117 Berlin, Germany
| | - Ida Shaef
- Institut für Chemie, Technische Universität Berlin, Sekr. PC14, Straße des 17. Juni 135, D-10623 Berlin, Germany
| | - Juan C Sanchez
- Department of Biology, Northeastern Illinois University, 5500 North St. Louis Avenue, Chicago, Illinois 60625, United States
| | - Melissa Carrillo
- Department of Biology, Northeastern Illinois University, 5500 North St. Louis Avenue, Chicago, Illinois 60625, United States
| | - Moraima Noda
- Department of Biology, Northeastern Illinois University, 5500 North St. Louis Avenue, Chicago, Illinois 60625, United States
| | - Denisse Feliz
- Department of Biology, Northeastern Illinois University, 5500 North St. Louis Avenue, Chicago, Illinois 60625, United States
| | - Emina A Stojković
- Department of Biology, Northeastern Illinois University, 5500 North St. Louis Avenue, Chicago, Illinois 60625, United States
| | - Peter Hildebrandt
- Institut für Chemie, Technische Universität Berlin, Sekr. PC14, Straße des 17. Juni 135, D-10623 Berlin, Germany
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7
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Kübel J, Westenhoff S, Maj M. Giving voice to the weak: Application of active noise reduction in transient infrared spectroscopy. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.139059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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8
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Fischer T, van Wilderen LJGW, Gnau P, Bredenbeck J, Essen LO, Wachtveitl J, Slavov C. Ultrafast Photoconversion Dynamics of the Knotless Phytochrome SynCph2. Int J Mol Sci 2021; 22:ijms221910690. [PMID: 34639031 PMCID: PMC8508867 DOI: 10.3390/ijms221910690] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 09/24/2021] [Accepted: 09/28/2021] [Indexed: 12/03/2022] Open
Abstract
The family of phytochrome photoreceptors contains proteins with different domain architectures and spectral properties. Knotless phytochromes are one of the three main subgroups classified by their distinct lack of the PAS domain in their photosensory core module, which is in contrast to the canonical PAS-GAF-PHY array. Despite intensive research on the ultrafast photodynamics of phytochromes, little is known about the primary kinetics in knotless phytochromes. Here, we present the ultrafast Pr ⇆ Pfr photodynamics of SynCph2, the best-known knotless phytochrome. Our results show that the excited state lifetime of Pr* (~200 ps) is similar to bacteriophytochromes, but much longer than in most canonical phytochromes. We assign the slow Pr* kinetics to relaxation processes of the chromophore-binding pocket that controls the bilin chromophore’s isomerization step. The Pfr photoconversion dynamics starts with a faster excited state relaxation than in canonical phytochromes, but, despite the differences in the respective domain architectures, proceeds via similar ground state intermediate steps up to Meta-F. Based on our observations, we propose that the kinetic features and overall dynamics of the ultrafast photoreaction are determined to a great extent by the geometrical context (i.e., available space and flexibility) within the binding pocket, while the general reaction steps following the photoexcitation are most likely conserved among the red/far-red phytochromes.
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Affiliation(s)
- Tobias Fischer
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt am Main, Max-von-Laue Straße 7, 60438 Frankfurt, Germany;
| | - Luuk J. G. W. van Wilderen
- Institute of Biophysics, Goethe University Frankfurt am Main, Max-von-Laue Straße 1, 60438 Frankfurt, Germany; (L.J.G.W.v.W.); (J.B.)
| | - Petra Gnau
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany; (P.G.); (L.-O.E.)
| | - Jens Bredenbeck
- Institute of Biophysics, Goethe University Frankfurt am Main, Max-von-Laue Straße 1, 60438 Frankfurt, Germany; (L.J.G.W.v.W.); (J.B.)
| | - Lars-Oliver Essen
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany; (P.G.); (L.-O.E.)
- Center for Synthetic Microbiology, Philipps-Universität Marburg, Hans-Meerwein-Straße 6, 35032 Marburg, Germany
| | - Josef Wachtveitl
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt am Main, Max-von-Laue Straße 7, 60438 Frankfurt, Germany;
- Correspondence: (J.W.); (C.S.)
| | - Chavdar Slavov
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt am Main, Max-von-Laue Straße 7, 60438 Frankfurt, Germany;
- Correspondence: (J.W.); (C.S.)
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9
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Takala H, Edlund P, Ihalainen JA, Westenhoff S. Tips and turns of bacteriophytochrome photoactivation. Photochem Photobiol Sci 2021; 19:1488-1510. [PMID: 33107538 DOI: 10.1039/d0pp00117a] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Phytochromes are ubiquitous photosensor proteins, which control the growth, reproduction and movement in plants, fungi and bacteria. Phytochromes switch between two photophysical states depending on the light conditions. In analogy to molecular machines, light absorption induces a series of structural changes that are transduced from the bilin chromophore, through the protein, and to the output domains. Recent progress towards understanding this structural mechanism of signal transduction has been manifold. We describe this progress with a focus on bacteriophytochromes. We describe the mechanism along three structural tiers, which are the chromophore-binding pocket, the photosensory module, and the output domains. We discuss possible interconnections between the tiers and conclude by presenting future directions and open questions. We hope that this review may serve as a compendium to guide future structural and spectroscopic studies designed to understand structural signaling in phytochromes.
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Affiliation(s)
- Heikki Takala
- Department of Biological and Environmental Science, Nanoscience Center, University of Jyvaskyla, Box 35, 40014 Jyvaskyla, Finland. and Department of Anatomy, Faculty of Medicine, University of Helsinki, Box 63, 00014 Helsinki, Finland
| | - Petra Edlund
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, 40530 Gothenburg, Sweden.
| | - Janne A Ihalainen
- Department of Biological and Environmental Science, Nanoscience Center, University of Jyvaskyla, Box 35, 40014 Jyvaskyla, Finland.
| | - Sebastian Westenhoff
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, 40530 Gothenburg, Sweden.
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10
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Carrillo M, Pandey S, Sanchez J, Noda M, Poudyal I, Aldama L, Malla TN, Claesson E, Wahlgren WY, Feliz D, Šrajer V, Maj M, Castillon L, Iwata S, Nango E, Tanaka R, Tanaka T, Fangjia L, Tono K, Owada S, Westenhoff S, Stojković EA, Schmidt M. High-resolution crystal structures of transient intermediates in the phytochrome photocycle. Structure 2021; 29:743-754.e4. [PMID: 33756101 DOI: 10.1016/j.str.2021.03.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 01/31/2021] [Accepted: 03/02/2021] [Indexed: 12/17/2022]
Abstract
Phytochromes are red/far-red light photoreceptors in bacteria to plants, which elicit a variety of important physiological responses. They display a reversible photocycle between the resting Pr state and the light-activated Pfr state. Light signals are transduced as structural change through the entire protein to modulate its activity. It is unknown how the Pr-to-Pfr interconversion occurs, as the structure of intermediates remains notoriously elusive. Here, we present short-lived crystal structures of the photosensory core modules of the bacteriophytochrome from myxobacterium Stigmatella aurantiaca captured by an X-ray free electron laser 5 ns and 33 ms after light illumination of the Pr state. We observe large structural displacements of the covalently bound bilin chromophore, which trigger a bifurcated signaling pathway that extends through the entire protein. The snapshots show with atomic precision how the signal progresses from the chromophore, explaining how plants, bacteria, and fungi sense red light.
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Affiliation(s)
- Melissa Carrillo
- Department of Biology, Northeastern Illinois University, 5500 North St. Louis Avenue, Chicago, IL 60625, USA
| | - Suraj Pandey
- Physics Department, University of Wisconsin-Milwaukee, 3135 North Maryland Avenue, Milwaukee, WI 53211, USA
| | - Juan Sanchez
- Department of Biology, Northeastern Illinois University, 5500 North St. Louis Avenue, Chicago, IL 60625, USA
| | - Moraima Noda
- Department of Biology, Northeastern Illinois University, 5500 North St. Louis Avenue, Chicago, IL 60625, USA
| | - Ishwor Poudyal
- Physics Department, University of Wisconsin-Milwaukee, 3135 North Maryland Avenue, Milwaukee, WI 53211, USA
| | - Luis Aldama
- Department of Biology, Northeastern Illinois University, 5500 North St. Louis Avenue, Chicago, IL 60625, USA
| | - Tek Narsingh Malla
- Physics Department, University of Wisconsin-Milwaukee, 3135 North Maryland Avenue, Milwaukee, WI 53211, USA
| | - Elin Claesson
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, 40530 Gothenburg, Sweden
| | - Weixiao Yuan Wahlgren
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, 40530 Gothenburg, Sweden
| | - Denisse Feliz
- Department of Biology, Northeastern Illinois University, 5500 North St. Louis Avenue, Chicago, IL 60625, USA
| | - Vukica Šrajer
- The University of Chicago, Center for Advanced Radiation Sources, 9700 South Cass Avenue, Bldg 434B, Argonne, IL 60439, USA
| | - Michał Maj
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, 40530 Gothenburg, Sweden
| | - Leticia Castillon
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, 40530 Gothenburg, Sweden
| | - So Iwata
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501, Japan; RIKEN SPring-8 Center, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Eriko Nango
- RIKEN SPring-8 Center, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan; Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Rie Tanaka
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501, Japan; RIKEN SPring-8 Center, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Tomoyuki Tanaka
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501, Japan; RIKEN SPring-8 Center, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Luo Fangjia
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501, Japan; RIKEN SPring-8 Center, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Kensuke Tono
- RIKEN SPring-8 Center, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan; Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Shigeki Owada
- RIKEN SPring-8 Center, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan; Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Sebastian Westenhoff
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, 40530 Gothenburg, Sweden.
| | - Emina A Stojković
- Department of Biology, Northeastern Illinois University, 5500 North St. Louis Avenue, Chicago, IL 60625, USA.
| | - Marius Schmidt
- Physics Department, University of Wisconsin-Milwaukee, 3135 North Maryland Avenue, Milwaukee, WI 53211, USA.
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11
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Kirpich JS, Chang CW, Franse J, Yu Q, Escobar FV, Jenkins AJ, Martin SS, Narikawa R, Ames JB, Lagarias JC, Larsen DS. Comparison of the Forward and Reverse Photocycle Dynamics of Two Highly Similar Canonical Red/Green Cyanobacteriochromes Reveals Unexpected Differences. Biochemistry 2021; 60:274-288. [PMID: 33439010 DOI: 10.1021/acs.biochem.0c00796] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Cyanobacteriochromes (CBCRs) are cyanobacterial photoreceptors that exhibit photochromism between two states: a thermally stable dark-adapted state and a metastable light-adapted state with bound linear tetrapyrrole (bilin) chromophores possessing 15Z and 15E configurations, respectively. The photodynamics of canonical red/green CBCRs have been extensively studied; however, the time scales of their excited-state lifetimes and subsequent ground-state evolution rates widely differ and, at present, remain difficult to predict. Here, we compare the photodynamics of two closely related red/green CBCRs that have substantial sequence identity (∼68%) and similar chromophore environments: AnPixJg2 from Anabaena sp. PCC 7120 and NpR6012g4 from Nostoc punctiforme. Using broadband transient absorption spectroscopy on the primary (125 fs to 7 ns) and secondary (7 ns to 10 ms) time scales together with global analysis modeling, our studies revealed that AnPixJg2 and NpR6012g4 have comparable quantum yields for initiating the forward (15ZPr → 15EPg) and reverse (15EPg → 15ZPr) reactions, which proceed through monotonic and nonmonotonic mechanisms, respectively. In addition to small discrepancies in the kinetics, the secondary reverse dynamics resolved unique features for each domain: intermediate shunts in NpR6012g4 and a Meta-Gf intermediate red-shifted from the 15ZPr photoproduct in AnPixJg2. Overall, this study supports the conclusion that sequence similarity is a useful criterion for predicting pathways of the light-induced evolution and quantum yield of generating primary intermediate Φp within subfamilies of CBCRs, but more studies are still needed to develop a comprehensive molecular level understanding of these processes.
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Affiliation(s)
- Julia S Kirpich
- Department of Chemistry, University of California, Davis, One Shields Ave, Davis, California 95616, United States
| | - Che-Wei Chang
- Department of Chemistry, University of California, Davis, One Shields Ave, Davis, California 95616, United States
| | - Jasper Franse
- Department of Chemistry, University of California, Davis, One Shields Ave, Davis, California 95616, United States
| | - Qinhong Yu
- Department of Chemistry, University of California, Davis, One Shields Ave, Davis, California 95616, United States
| | - Francisco Velazquez Escobar
- Institut für Chemie, Technische Universität Berlin, Sekr. PC14, Straße des 17 Juni 135, D-10623 Berlin, Germany
| | - Adam J Jenkins
- Department of Chemistry, University of California, Davis, One Shields Ave, Davis, California 95616, United States
| | - Shelley S Martin
- Department of Molecular and Cell Biology, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Rei Narikawa
- Department of Biological Sciences, Faculty of Sciences, Shizuoka University, 836, Ohya, Suruga-ku, Shizuoka-Shi, Shizuoka-Ken 422-8529, Japan
| | - James B Ames
- Department of Chemistry, University of California, Davis, One Shields Ave, Davis, California 95616, United States
| | - J Clark Lagarias
- Department of Molecular and Cell Biology, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Delmar S Larsen
- Department of Chemistry, University of California, Davis, One Shields Ave, Davis, California 95616, United States
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12
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Fischer T, Xu Q, Zhao K, Gärtner W, Slavov C, Wachtveitl J. Effect of the PHY Domain on the Photoisomerization Step of the Forward P r →P fr Conversion of a Knotless Phytochrome. Chemistry 2020; 26:17261-17266. [PMID: 32812681 PMCID: PMC7839672 DOI: 10.1002/chem.202003138] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 08/04/2020] [Indexed: 01/26/2023]
Abstract
Phytochrome photoreceptors operate via photoisomerization of a bound bilin chromophore. Their typical architecture consists of GAF, PAS and PHY domains. Knotless phytochromes lack the PAS domain, while retaining photoconversion abilities, with some being able to photoconvert with just the GAF domain. Therefore, we investigated the ultrafast photoisomerization of the Pr state of a knotless phytochrome to reveal the effect of the PHY domain and its "tongue" region on the transduction of the light signal. We show that the PHY domain does not affect the initial conformational dynamics of the chromophore. However, it significantly accelerates the consecutively induced reorganizational dynamics of the protein, necessary for the progression of the photoisomerization. Consequently, the PHY domain keeps the bilin and its binding pocket in a more reactive conformation, which decreases the extent of protein reorganization required for the chromophore isomerization. Thereby, less energy is lost along nonproductive reaction pathways, resulting in increased efficiency.
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Affiliation(s)
- Tobias Fischer
- Institute of Physical and Theoretical ChemistryGoethe University Frankfurt am MainMax-von-Laue Straße 760438FrankfurtGermany
| | - Qianzhao Xu
- Institute of Analytical ChemistryUniversity of LeipzigLinnéstr. 304103LeipzigGermany
| | - Kai‐Hong Zhao
- Key State Laboratory of Agriculture MicrobiologyHuazhong Agriculture University WuhanShizishan Street, Hongshan DistrictWuhan430070P. R. China
| | - Wolfgang Gärtner
- Institute of Analytical ChemistryUniversity of LeipzigLinnéstr. 304103LeipzigGermany
| | - Chavdar Slavov
- Institute of Physical and Theoretical ChemistryGoethe University Frankfurt am MainMax-von-Laue Straße 760438FrankfurtGermany
| | - Josef Wachtveitl
- Institute of Physical and Theoretical ChemistryGoethe University Frankfurt am MainMax-von-Laue Straße 760438FrankfurtGermany
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13
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Jenkins AJ, Gottlieb SM, Chang CW, Kim PW, Hayer RJ, Hanke SJ, Martin SS, Lagarias JC, Larsen DS. Conservation and Diversity in the Primary Reverse Photodynamics of the Canonical Red/Green Cyanobacteriochrome Family. Biochemistry 2020; 59:4015-4028. [PMID: 33021375 DOI: 10.1021/acs.biochem.0c00454] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this report, we compare the femtosecond to nanosecond primary reverse photodynamics (15EPg → 15ZPr) of eight tetrapyrrole binding photoswitching cyanobacteriochromes in the canonical red/green family from the cyanobacterium Nostoc punctiforme. Three characteristic classes were identified on the basis of the diversity of excited-state and ground-state properties, including the lifetime, photocycle initiation quantum yield, photointermediate stability, spectra, and temporal properties. We observed a correlation between the excited-state lifetime and peak wavelength of the electronic absorption spectrum with higher-energy-absorbing representatives exhibiting both faster excited-state decay times and higher photoisomerization quantum yields. The latter was attributed to both an increased number of structural restraints and differences in H-bonding networks that facilitate photoisomerization. All three classes exhibited primary Lumi-Go intermediates, with class II and III representatives evolving to a secondary Meta-G photointermediate. Class II Meta-GR intermediates were orange absorbing, whereas class III Meta-G had structurally relaxed, red-absorbing chromophores that resemble their dark-adapted 15ZPr states. Differences in the reverse and forward reaction mechanisms are discussed within the context of structural constraints.
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Affiliation(s)
- Adam J Jenkins
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Sean Marc Gottlieb
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Che-Wei Chang
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Peter W Kim
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Randeep J Hayer
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Samuel J Hanke
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Shelley S Martin
- Department of Molecular and Cellular Biology, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - J Clark Lagarias
- Department of Molecular and Cellular Biology, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Delmar S Larsen
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
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14
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Wang D, Qin Y, Zhang M, Li X, Wang L, Yang X, Zhong D. The Origin of Ultrafast Multiphasic Dynamics in Photoisomerization of Bacteriophytochrome. J Phys Chem Lett 2020; 11:5913-5919. [PMID: 32614188 PMCID: PMC8172095 DOI: 10.1021/acs.jpclett.0c01394] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Red-light bacteriophytochromes regulate many physiological functions through photoisomerization of a linear tetrapyrrole chromophore. In this work, we mapped out femtosecond-resolved fluorescence spectra of the excited Pr state and observed unique active-site relaxations on the picosecond time scale with unusual spectral tuning of rises on the blue side and decays on the red side of the emission. We also observed initial wavepacket dynamics in femtoseconds with two low-frequency modes of 38 and 181 cm-1 as well as the intermediate product formation after isomerization in hundreds of picoseconds. With critical mutations at the active site, we observed similar dynamic patterns with different times for both relaxation and isomerization, consistent with the structural and chemical changes induced by the mutations. The observed multiphasic dynamics clearly represents the active-site relaxation, not different intermediate reactions or excitation of heterogeneous ground states. The active-site relaxation must be considered in understanding overall isomerization reactions in phytochromes, and such a molecular mechanism should be general.
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Affiliation(s)
- Dihao Wang
- Program of Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Yangzhong Qin
- Department of Physics, The Ohio State University, Columbus, Ohio 43210, United States
| | - Meng Zhang
- Program of Biophysics, The Ohio State University, Columbus, Ohio 43210, United States
| | - Xiankun Li
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Lijuan Wang
- Department of Physics, The Ohio State University, Columbus, Ohio 43210, United States
| | - Xiaojing Yang
- Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States
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15
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The interplay between chromophore and protein determines the extended excited state dynamics in a single-domain phytochrome. Proc Natl Acad Sci U S A 2020; 117:16356-16362. [PMID: 32591422 DOI: 10.1073/pnas.1921706117] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Phytochromes are a diverse family of bilin-binding photoreceptors that regulate a wide range of physiological processes. Their photochemical properties make them attractive for applications in optogenetics and superresolution microscopy. Phytochromes undergo reversible photoconversion triggered by the Z ⇄ E photoisomerization about the double bond in the bilin chromophore. However, it is not fully understood at the molecular level how the protein framework facilitates the complex photoisomerization dynamics. We have studied a single-domain bilin-binding photoreceptor All2699g1 (Nostoc sp. PCC 7120) that exhibits photoconversion between the red light-absorbing (Pr) and far red-absorbing (Pfr) states just like canonical phytochromes. We present the crystal structure and examine the photoisomerization mechanism of the Pr form as well as the formation of the primary photoproduct Lumi-R using time-resolved spectroscopy and hybrid quantum mechanics/molecular mechanics simulations. We show that the unusually long excited state lifetime (broad lifetime distribution centered at ∼300 picoseconds) is due to the interactions between the isomerizing pyrrole ring D and an adjacent conserved Tyr142. The decay kinetics shows a strongly distributed character which is imposed by the nonexponential protein dynamics. Our findings offer a mechanistic insight into how the quantum efficiency of the bilin photoisomerization is tuned by the protein environment, thereby providing a structural framework for engineering bilin-based optical agents for imaging and optogenetics applications.
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16
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De Zitter E, Ridard J, Thédié D, Adam V, Lévy B, Byrdin M, Gotthard G, Van Meervelt L, Dedecker P, Demachy I, Bourgeois D. Mechanistic Investigations of Green mEos4b Reveal a Dynamic Long-Lived Dark State. J Am Chem Soc 2020; 142:10978-10988. [PMID: 32463688 DOI: 10.1021/jacs.0c01880] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Green-to-red photoconvertible fluorescent proteins (PCFPs) are key players in advanced microscopy schemes such as photoactivated localization microscopy (PALM). Whereas photoconversion and red-state blinking in PCFPs have been studied intensively, their green-state photophysical behavior has received less attention. Yet dark states in green PCFPs can become strongly populated in PALM schemes and exert an indirect but considerable influence on the quality of data recorded in the red channel. Furthermore, green-state photoswitching in PCFPs can be used directly for PALM and has been engineered to design highly efficient reversibly switchable fluorescent proteins (RSFPs) amenable to various nanoscopy schemes. Here, we demonstrate that green mEos4b efficiently switches to a long-lived dark state through cis-trans isomerization of its chromophore, as do most RSFPs. However, by combining kinetic crystallography, molecular dynamics simulations, and Raman spectroscopy, we find that the dark state in green mEos4b is much more dynamic than that seen in switched-off green IrisFP, a biphotochromic PCFP engineered from the common EosFP parent. Our data suggest that H-bonding patterns maintained by the chromophore in green PCFPs and RSFPs in both their on- and off-states collectively control photoswitching quantum yields. The reduced number of H-bonds maintained by the dynamic dark chromophore in green mEos4b thus largely accounts for the observed lower switching contrast as compared to that of IrisFP. We also compare the long-lived dark states reached from green and red mEos4b, on the basis of their X-ray structures and Raman signatures. Altogether, these data provide a unifying picture of the complex photophysics of PCFPs and RSFPs.
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Affiliation(s)
- Elke De Zitter
- Department of Chemistry, KU Leuven, Heverlee 3001, Belgium
| | - Jacqueline Ridard
- Institut de Chimie Physique UMR8000, Université Paris-Saclay, CNRS, Orsay 91405, France
| | - Daniel Thédié
- Institut de Biologie Structurale, Université Grenoble Alpes, CEA, CNRS, Grenoble 38044, France
| | - Virgile Adam
- Institut de Biologie Structurale, Université Grenoble Alpes, CEA, CNRS, Grenoble 38044, France
| | - Bernard Lévy
- Institut de Chimie Physique UMR8000, Université Paris-Saclay, CNRS, Orsay 91405, France
| | - Martin Byrdin
- Institut de Biologie Structurale, Université Grenoble Alpes, CEA, CNRS, Grenoble 38044, France
| | - Guillaume Gotthard
- Structural Biology Group, European Synchrotron Radiation Facility, Grenoble 38000, France
| | | | - Peter Dedecker
- Department of Chemistry, KU Leuven, Heverlee 3001, Belgium
| | - Isabelle Demachy
- Institut de Chimie Physique UMR8000, Université Paris-Saclay, CNRS, Orsay 91405, France
| | - Dominique Bourgeois
- Institut de Biologie Structurale, Université Grenoble Alpes, CEA, CNRS, Grenoble 38044, France
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17
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Antonucci L, Solinas X, Bonvalet A, Joffre M. Electronic measurement of femtosecond time delays for arbitrary-detuning asynchronous optical sampling. OPTICS EXPRESS 2020; 28:18251-18260. [PMID: 32680025 DOI: 10.1364/oe.393887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 05/27/2020] [Indexed: 06/11/2023]
Abstract
Arbitrary-Detuning ASynchronous OPtical Sampling (ADASOPS) is a pump-probe technique which relies on the stability of femtosecond oscillators. It provides access to a multiscale time window ranging up to millisecond, combined with a sub-picosecond time resolution. In contrast with the first ADASOPS demonstration based on the interferometric detection of coincidences between optical pulses, we show here that the optical setup can now be reduced to a mere pair of photodetectors embedded in a specially-designed electronic system. In analogy with super-resolution methods used in optical microscopy for localizing single emitters beyond the diffraction limit, we demonstrate that purely electronic means allow the determination of time delays between each pump-probe pulse pair with a standard deviation as small as 200 fs. The new method is shown to be simpler, more versatile and more accurate than the coincidence-based approach.
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18
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Kraskov A, Nguyen AD, Goerling J, Buhrke D, Velazquez Escobar F, Fernandez Lopez M, Michael N, Sauthof L, Schmidt A, Piwowarski P, Yang Y, Stensitzki T, Adam S, Bartl F, Schapiro I, Heyne K, Siebert F, Scheerer P, Mroginski MA, Hildebrandt P. Intramolecular Proton Transfer Controls Protein Structural Changes in Phytochrome. Biochemistry 2020; 59:1023-1037. [DOI: 10.1021/acs.biochem.0c00053] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Anastasia Kraskov
- Technische Universität Berlin, Institut für Chemie, Sekr. PC14, Straße des 17. Juni 135, D-10623 Berlin, Germany
| | - Anh Duc Nguyen
- Technische Universität Berlin, Institut für Chemie, Sekr. PC14, Straße des 17. Juni 135, D-10623 Berlin, Germany
| | - Jan Goerling
- Technische Universität Berlin, Institut für Chemie, Sekr. PC14, Straße des 17. Juni 135, D-10623 Berlin, Germany
| | - David Buhrke
- Technische Universität Berlin, Institut für Chemie, Sekr. PC14, Straße des 17. Juni 135, D-10623 Berlin, Germany
| | - Francisco Velazquez Escobar
- Technische Universität Berlin, Institut für Chemie, Sekr. PC14, Straße des 17. Juni 135, D-10623 Berlin, Germany
| | - Maria Fernandez Lopez
- Technische Universität Berlin, Institut für Chemie, Sekr. PC14, Straße des 17. Juni 135, D-10623 Berlin, Germany
| | - Norbert Michael
- Technische Universität Berlin, Institut für Chemie, Sekr. PC14, Straße des 17. Juni 135, D-10623 Berlin, Germany
| | - Luisa Sauthof
- Group Protein X-ray Crystallography and Signal Transduction, Institute of Medical Physics and Biophysics, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, D-10117 Berlin, Germany
| | - Andrea Schmidt
- Group Protein X-ray Crystallography and Signal Transduction, Institute of Medical Physics and Biophysics, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, D-10117 Berlin, Germany
| | - Patrick Piwowarski
- Humboldt Universität zu Berlin, Institut für Biologie, Experimentelle Biophysik, Invalidenstraße 42, D-10115 Berlin, Germany
| | - Yang Yang
- Freie Universität Berlin, Experimentelle Physik, Arnimallee 14, D-14195 Berlin, Germany
| | - Till Stensitzki
- Freie Universität Berlin, Experimentelle Physik, Arnimallee 14, D-14195 Berlin, Germany
| | - Suliman Adam
- Institute of Chemistry, Fritz Haber Center for Molecular Dynamics, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Franz Bartl
- Humboldt Universität zu Berlin, Institut für Biologie, Experimentelle Biophysik, Invalidenstraße 42, D-10115 Berlin, Germany
| | - Igor Schapiro
- Institute of Chemistry, Fritz Haber Center for Molecular Dynamics, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Karsten Heyne
- Freie Universität Berlin, Experimentelle Physik, Arnimallee 14, D-14195 Berlin, Germany
| | - Friedrich Siebert
- Albert-Ludwigs-Universität Freiburg, Institut für Molekulare Medizin und Zellforschung, Sektion Biophysik, Hermann-Herderstraße 9, D-79104 Freiburg, Germany
| | - Patrick Scheerer
- Group Protein X-ray Crystallography and Signal Transduction, Institute of Medical Physics and Biophysics, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, D-10117 Berlin, Germany
| | - Maria Andrea Mroginski
- Technische Universität Berlin, Institut für Chemie, Sekr. PC14, Straße des 17. Juni 135, D-10623 Berlin, Germany
| | - Peter Hildebrandt
- Technische Universität Berlin, Institut für Chemie, Sekr. PC14, Straße des 17. Juni 135, D-10623 Berlin, Germany
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19
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Kübel J, Chenchiliyan M, Ooi SA, Gustavsson E, Isaksson L, Kuznetsova V, Ihalainen JA, Westenhoff S, Maj M. Transient IR spectroscopy identifies key interactions and unravels new intermediates in the photocycle of a bacterial phytochrome. Phys Chem Chem Phys 2020; 22:9195-9203. [DOI: 10.1039/c9cp06995j] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Infra-red spectroscopy advances our understanding of how photosensory proteins carry their function.
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Affiliation(s)
- Joachim Kübel
- Department of Chemistry and Molecular Biology
- University of Gothenburg
- Gothenburg 40530
- Sweden
| | - Manoop Chenchiliyan
- Department of Chemistry and Molecular Biology
- University of Gothenburg
- Gothenburg 40530
- Sweden
| | - Saik Ann Ooi
- Department of Chemistry and Molecular Biology
- University of Gothenburg
- Gothenburg 40530
- Sweden
| | - Emil Gustavsson
- Department of Chemistry and Molecular Biology
- University of Gothenburg
- Gothenburg 40530
- Sweden
| | - Linnéa Isaksson
- Department of Chemistry and Molecular Biology
- University of Gothenburg
- Gothenburg 40530
- Sweden
| | - Valentyna Kuznetsova
- Nanoscience Center
- Department of Biological and Environmental Science
- University of Jyväskylä
- Jyväskylä 40014
- Finland
| | - Janne A. Ihalainen
- Nanoscience Center
- Department of Biological and Environmental Science
- University of Jyväskylä
- Jyväskylä 40014
- Finland
| | - Sebastian Westenhoff
- Department of Chemistry and Molecular Biology
- University of Gothenburg
- Gothenburg 40530
- Sweden
| | - Michał Maj
- Department of Chemistry and Molecular Biology
- University of Gothenburg
- Gothenburg 40530
- Sweden
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20
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Competing excited-state deactivation processes in bacteriophytochromes. ADVANCES IN QUANTUM CHEMISTRY 2020. [DOI: 10.1016/bs.aiq.2020.05.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Buhrke D, Hildebrandt P. Probing Structure and Reaction Dynamics of Proteins Using Time-Resolved Resonance Raman Spectroscopy. Chem Rev 2019; 120:3577-3630. [PMID: 31814387 DOI: 10.1021/acs.chemrev.9b00429] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The mechanistic understanding of protein functions requires insight into the structural and reaction dynamics. To elucidate these processes, a variety of experimental approaches are employed. Among them, time-resolved (TR) resonance Raman (RR) is a particularly versatile tool to probe processes of proteins harboring cofactors with electronic transitions in the visible range, such as retinal or heme proteins. TR RR spectroscopy offers the advantage of simultaneously providing molecular structure and kinetic information. The various TR RR spectroscopic methods can cover a wide dynamic range down to the femtosecond time regime and have been employed in monitoring photoinduced reaction cascades, ligand binding and dissociation, electron transfer, enzymatic reactions, and protein un- and refolding. In this account, we review the achievements of TR RR spectroscopy of nearly 50 years of research in this field, which also illustrates how the role of TR RR spectroscopy in molecular life science has changed from the beginning until now. We outline the various methodological approaches and developments and point out current limitations and potential perspectives.
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Affiliation(s)
- David Buhrke
- Technische Universität Berlin, Institut für Chemie, Sekr. PC14, Straße des 17, Juni 135, D-10623 Berlin, Germany
| | - Peter Hildebrandt
- Technische Universität Berlin, Institut für Chemie, Sekr. PC14, Straße des 17, Juni 135, D-10623 Berlin, Germany
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22
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Wang D, Qin Y, Zhang S, Wang L, Yang X, Zhong D. Elucidating the Molecular Mechanism of Ultrafast Pfr-State Photoisomerization in Bathy Bacteriophytochrome PaBphP. J Phys Chem Lett 2019; 10:6197-6201. [PMID: 31577445 PMCID: PMC7268903 DOI: 10.1021/acs.jpclett.9b02446] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Bacteriophytochromes are photoreceptors that regulate various physiological processes induced by photoisomerization in a linear tetrapyrrole chromophore upon red/far-red light absorption. Here, we investigate the photoinduced Pfr-state isomerization mechanism of a bathy bacteriophytochrome from Pseudomonas aeruginosa combining femtosecond-resolved fluorescence and absorption methods. We observed initial coherent oscillation motions in the first 1 ps with low-frequency modes below 60 cm-1, then a bifurcation of the wavepacket with the distinct excited-state lifetimes in a few picoseconds, and finally chromophore-protein coupled ground-state conformational evolution on nanosecond time scales. Together with systematic mutational studies, we revealed the critical roles of hydrogen bonds in tuning the photoisomerization dynamics. These results provide a clear molecular picture of the Pfr-state photoisomerization, a mechanism likely applicable to the other phytochromes.
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Affiliation(s)
- Dihao Wang
- Department of Physics, Department of Chemistry and Biochemistry, Programs of Biophysics, Chemical
Physics, and Biochemistry, The Ohio State University, Columbus, OH 43210, United States
| | - Yangzhong Qin
- Department of Physics, Department of Chemistry and Biochemistry, Programs of Biophysics, Chemical
Physics, and Biochemistry, The Ohio State University, Columbus, OH 43210, United States
| | - Sheng Zhang
- Department of Physics, Department of Chemistry and Biochemistry, Programs of Biophysics, Chemical
Physics, and Biochemistry, The Ohio State University, Columbus, OH 43210, United States
| | - Lijuan Wang
- Department of Physics, Department of Chemistry and Biochemistry, Programs of Biophysics, Chemical
Physics, and Biochemistry, The Ohio State University, Columbus, OH 43210, United States
| | - Xiaojing Yang
- Department of Chemistry, University of Illinois at Chicago, Chicago, IL 60607, United States
| | - Dongping Zhong
- Department of Physics, Department of Chemistry and Biochemistry, Programs of Biophysics, Chemical
Physics, and Biochemistry, The Ohio State University, Columbus, OH 43210, United States
- Corresponding Author
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23
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Sanchez JC, Carrillo M, Pandey S, Noda M, Aldama L, Feliz D, Claesson E, Wahlgren WY, Tracy G, Duong P, Nugent AC, Field A, Šrajer V, Kupitz C, Iwata S, Nango E, Tanaka R, Tanaka T, Fangjia L, Tono K, Owada S, Westenhoff S, Schmidt M, Stojković EA. High-resolution crystal structures of a myxobacterial phytochrome at cryo and room temperatures. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2019; 6:054701. [PMID: 31559319 PMCID: PMC6748860 DOI: 10.1063/1.5120527] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Accepted: 08/27/2019] [Indexed: 05/04/2023]
Abstract
Phytochromes (PHYs) are photoreceptor proteins first discovered in plants, where they control a variety of photomorphogenesis events. PHYs as photochromic proteins can reversibly switch between two distinct states: a red light (Pr) and a far-red light (Pfr) absorbing form. The discovery of Bacteriophytochromes (BphPs) in nonphotosynthetic bacteria has opened new frontiers in our understanding of the mechanisms by which these natural photoswitches can control single cell development, although the role of BphPs in vivo remains largely unknown. BphPs are dimeric proteins that consist of a photosensory core module (PCM) and an enzymatic domain, often a histidine kinase. The PCM is composed of three domains (PAS, GAF, and PHY). It holds a covalently bound open-chain tetrapyrrole (biliverdin, BV) chromophore. Upon absorption of light, the double bond between BV rings C and D isomerizes and reversibly switches the protein between Pr and Pfr states. We report crystal structures of the wild-type and mutant (His275Thr) forms of the canonical BphP from the nonphotosynthetic myxobacterium Stigmatella aurantiaca (SaBphP2) in the Pr state. Structures were determined at 1.65 Å and 2.2 Å (respectively), the highest resolution of any PCM construct to date. We also report the room temperature wild-type structure of the same protein determined at 2.1 Å at the SPring-8 Angstrom Compact free electron LAser (SACLA), Japan. Our results not only highlight and confirm important amino acids near the chromophore that play a role in Pr-Pfr photoconversion but also describe the signal transduction into the PHY domain which moves across tens of angstroms after the light stimulus.
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Affiliation(s)
- Juan C. Sanchez
- Department of Biology, Northeastern Illinois University, 5500 N. St. Louis Ave., Chicago, Illinois 60625, USA
| | - Melissa Carrillo
- Department of Biology, Northeastern Illinois University, 5500 N. St. Louis Ave., Chicago, Illinois 60625, USA
| | - Suraj Pandey
- Physics Department, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave., Milwaukee, Wisconsin 53211, USA
| | - Moraima Noda
- Department of Biology, Northeastern Illinois University, 5500 N. St. Louis Ave., Chicago, Illinois 60625, USA
| | - Luis Aldama
- Department of Biology, Northeastern Illinois University, 5500 N. St. Louis Ave., Chicago, Illinois 60625, USA
| | - Denisse Feliz
- Department of Biology, Northeastern Illinois University, 5500 N. St. Louis Ave., Chicago, Illinois 60625, USA
| | - Elin Claesson
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, 40530 Gothenburg, Sweden
| | - Weixiao Yuan Wahlgren
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, 40530 Gothenburg, Sweden
| | - Gregory Tracy
- Department of Biology, Northeastern Illinois University, 5500 N. St. Louis Ave., Chicago, Illinois 60625, USA
| | - Phu Duong
- Department of Biology, Northeastern Illinois University, 5500 N. St. Louis Ave., Chicago, Illinois 60625, USA
| | - Angela C. Nugent
- Department of Biology, Northeastern Illinois University, 5500 N. St. Louis Ave., Chicago, Illinois 60625, USA
| | - Andrew Field
- Department of Biology, Northeastern Illinois University, 5500 N. St. Louis Ave., Chicago, Illinois 60625, USA
| | - Vukica Šrajer
- The University of Chicago, Center for Advanced Radiation Sources, 9700 South Cass Ave., Bldg 434B, Argonne, Illinois 60439, USA
| | - Christopher Kupitz
- Physics Department, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave., Milwaukee, Wisconsin 53211, USA
| | | | | | | | | | | | | | | | - Sebastian Westenhoff
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, 40530 Gothenburg, Sweden
| | - Marius Schmidt
- Physics Department, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave., Milwaukee, Wisconsin 53211, USA
| | - Emina A. Stojković
- Department of Biology, Northeastern Illinois University, 5500 N. St. Louis Ave., Chicago, Illinois 60625, USA
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24
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Rumfeldt JA, Takala H, Liukkonen A, Ihalainen JA. UV‐Vis Spectroscopy Reveals a Correlation Between Y263 and BV Protonation States in Bacteriophytochromes. Photochem Photobiol 2019; 95:969-979. [DOI: 10.1111/php.13095] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Accepted: 02/26/2019] [Indexed: 11/29/2022]
Affiliation(s)
- Jessica A. Rumfeldt
- Department of Biological and Environmental Science Nanoscience Center University of Jyväskylä Jyväskylä Finland
| | - Heikki Takala
- Department of Biological and Environmental Science Nanoscience Center University of Jyväskylä Jyväskylä Finland
- Anatomy Faculty of Medicine University of Helsinki Helsinki Finland
| | - Alli Liukkonen
- Department of Biological and Environmental Science Nanoscience Center University of Jyväskylä Jyväskylä Finland
| | - Janne A. Ihalainen
- Department of Biological and Environmental Science Nanoscience Center University of Jyväskylä Jyväskylä Finland
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25
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Cao X, Zhang C, Gao Z, Liu Y, Zhao Y, Yang Y, Chen J, Jimenez R, Xu J. Ultrafast internal conversion dynamics of bilirubin bound to UnaG and its N57A mutant. Phys Chem Chem Phys 2019; 21:2365-2371. [PMID: 30666332 DOI: 10.1039/c8cp07553k] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Fluorescent proteins (FPs) have become fundamental tools for live cell imaging. Most FPs currently used are members of the green fluorescent protein super-family, but new fluorophores such as bilin-FPs are being developed and optimized. In particular, the UnaG FP incorporates bilirubin (BR) as a chromophore, enhancing its fluorescence quantum yield by three orders of magnitude relative to that in solution. To investigate the mechanism of this dramatic enhancement and provide a basis for further engineering of UnaG and other tetrapyrrole-based fluorophores, we performed picosecond fluorescence and femtosecond transient absorption measurements of BR bound to UnaG and its N57A site-directed mutant. The dynamics of wt-UnaG, which has a fluorescence QY of 0.51, are largely homogeneous, showing an excited state relaxation of ∼200 ps, and a 2.2 ns excited-state lifetime decay with a kinetic isotope effect (KIE) of 1.1 for D2O vs. H2O buffer. In contrast, for UnaG N57A (fluorescence QY 0.01) the results show a large spectral inhomogeneity with excited state decay timescales of 47 and 200 ps and a KIE of 1.4. The non-radiative deactivation of the excited state is limited by proton transfer. The loss of direct hydrogen bonds to the endo-vinyl dipyrrinone moiety of BR leads to high flexibility and structural heterogeneity of UnaG N57A, as seen in the X-ray crystal structure.
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Affiliation(s)
- Xiaodan Cao
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China.
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26
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Konold PE, van Stokkum IHM, Muzzopappa F, Wilson A, Groot ML, Kirilovsky D, Kennis JTM. Photoactivation Mechanism, Timing of Protein Secondary Structure Dynamics and Carotenoid Translocation in the Orange Carotenoid Protein. J Am Chem Soc 2019; 141:520-530. [PMID: 30511841 PMCID: PMC6331140 DOI: 10.1021/jacs.8b11373] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Indexed: 01/10/2023]
Abstract
The orange carotenoid protein (OCP) is a two-domain photoactive protein that noncovalently binds an echinenone (ECN) carotenoid and mediates photoprotection in cyanobacteria. In the dark, OCP assumes an orange, inactive state known as OCPO; blue light illumination results in the red active state, known as OCPR. The OCPR state is characterized by large-scale structural changes that involve dissociation and separation of C-terminal and N-terminal domains accompanied by carotenoid translocation into the N-terminal domain. The mechanistic and dynamic-structural relations between photon absorption and formation of the OCPR state have remained largely unknown. Here, we employ a combination of time-resolved UV-visible and (polarized) mid-infrared spectroscopy to assess the electronic and structural dynamics of the carotenoid and the protein secondary structure, from femtoseconds to 0.5 ms. We identify a hereto unidentified carotenoid excited state in OCP, the so-called S* state, which we propose to play a key role in breaking conserved hydrogen-bond interactions between carotenoid and aromatic amino acids in the binding pocket. We arrive at a comprehensive reaction model where the hydrogen-bond rupture with conserved aromatic side chains at the carotenoid β1-ring in picoseconds occurs at a low yield of <1%, whereby the β1-ring retains a trans configuration with respect to the conjugated π-electron chain. This event initiates structural changes at the N-terminal domain in 1 μs, which allow the carotenoid to translocate into the N-terminal domain in 10 μs. We identified infrared signatures of helical elements that dock on the C-terminal domain β-sheet in the dark and unfold in the light to allow domain separation. These helical elements do not move within the experimental range of 0.5 ms, indicating that domain separation occurs on longer time scales, lagging carotenoid translocation by at least 2 decades of time.
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Affiliation(s)
- Patrick E. Konold
- Department of Physics
and Astronomy, Faculty of Sciences, Vrije
Universiteit, De Boelelaan
1081, 1081HV Amsterdam, The Netherlands
| | - Ivo H. M. van Stokkum
- Department of Physics
and Astronomy, Faculty of Sciences, Vrije
Universiteit, De Boelelaan
1081, 1081HV Amsterdam, The Netherlands
| | - Fernando Muzzopappa
- Institute for Integrative Biology of the
Cell (I2BC), CEA, CNRS, Universite Paris-Sud,
Universite Paris-Saclay, 91198 Gif-sur-Yvette, France
- Institut Joliot, Commissariat a l’Energie
Atomique (CEA), 91191 Gif-sur-Yvette, France
| | - Adjélé Wilson
- Institute for Integrative Biology of the
Cell (I2BC), CEA, CNRS, Universite Paris-Sud,
Universite Paris-Saclay, 91198 Gif-sur-Yvette, France
- Institut Joliot, Commissariat a l’Energie
Atomique (CEA), 91191 Gif-sur-Yvette, France
| | - Marie-Louise Groot
- Department of Physics
and Astronomy, Faculty of Sciences, Vrije
Universiteit, De Boelelaan
1081, 1081HV Amsterdam, The Netherlands
| | - Diana Kirilovsky
- Institute for Integrative Biology of the
Cell (I2BC), CEA, CNRS, Universite Paris-Sud,
Universite Paris-Saclay, 91198 Gif-sur-Yvette, France
- Institut Joliot, Commissariat a l’Energie
Atomique (CEA), 91191 Gif-sur-Yvette, France
| | - John T. M. Kennis
- Department of Physics
and Astronomy, Faculty of Sciences, Vrije
Universiteit, De Boelelaan
1081, 1081HV Amsterdam, The Netherlands
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27
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Ihalainen JA, Gustavsson E, Schroeder L, Donnini S, Lehtivuori H, Isaksson L, Thöing C, Modi V, Berntsson O, Stucki-Buchli B, Liukkonen A, Häkkänen H, Kalenius E, Westenhoff S, Kottke T. Chromophore–Protein Interplay during the Phytochrome Photocycle Revealed by Step-Scan FTIR Spectroscopy. J Am Chem Soc 2018; 140:12396-12404. [DOI: 10.1021/jacs.8b04659] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Janne A. Ihalainen
- Nanoscience Center, Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä 40014, Finland
| | - Emil Gustavsson
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg 40530, Sweden
| | - Lea Schroeder
- Physical and Biophysical Chemistry, Bielefeld University, Universitätsstr. 25, 33615 Bielefeld, Germany
| | - Serena Donnini
- Nanoscience Center, Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä 40014, Finland
| | - Heli Lehtivuori
- Nanoscience Center, Department of Physics, University of Jyväskylä, Jyväskylä 40014, Finland
| | - Linnéa Isaksson
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg 40530, Sweden
| | - Christian Thöing
- Physical and Biophysical Chemistry, Bielefeld University, Universitätsstr. 25, 33615 Bielefeld, Germany
| | - Vaibhav Modi
- Nanoscience Center, Department of Chemistry, University of Jyväskylä, Jyväskylä 40014, Finland
| | - Oskar Berntsson
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg 40530, Sweden
| | - Brigitte Stucki-Buchli
- Nanoscience Center, Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä 40014, Finland
| | - Alli Liukkonen
- Nanoscience Center, Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä 40014, Finland
| | - Heikki Häkkänen
- Nanoscience Center, Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä 40014, Finland
| | - Elina Kalenius
- Nanoscience Center, Department of Chemistry, University of Jyväskylä, Jyväskylä 40014, Finland
| | - Sebastian Westenhoff
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg 40530, Sweden
| | - Tilman Kottke
- Physical and Biophysical Chemistry, Bielefeld University, Universitätsstr. 25, 33615 Bielefeld, Germany
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28
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Woitowich NC, Halavaty AS, Waltz P, Kupitz C, Valera J, Tracy G, Gallagher KD, Claesson E, Nakane T, Pandey S, Nelson G, Tanaka R, Nango E, Mizohata E, Owada S, Tono K, Joti Y, Nugent AC, Patel H, Mapara A, Hopkins J, Duong P, Bizhga D, Kovaleva SE, St. Peter R, Hernandez CN, Ozarowski WB, Roy-Chowdhuri S, Yang JH, Edlund P, Takala H, Ihalainen J, Brayshaw J, Norwood T, Poudyal I, Fromme P, Spence JCH, Moffat K, Westenhoff S, Schmidt M, Stojković EA. Structural basis for light control of cell development revealed by crystal structures of a myxobacterial phytochrome. IUCRJ 2018; 5:619-634. [PMID: 30224965 PMCID: PMC6126659 DOI: 10.1107/s2052252518010631] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Accepted: 07/23/2018] [Indexed: 05/11/2023]
Abstract
Phytochromes are red-light photoreceptors that were first characterized in plants, with homologs in photosynthetic and non-photosynthetic bacteria known as bacteriophytochromes (BphPs). Upon absorption of light, BphPs interconvert between two states denoted Pr and Pfr with distinct absorption spectra in the red and far-red. They have recently been engineered as enzymatic photoswitches for fluorescent-marker applications in non-invasive tissue imaging of mammals. This article presents cryo- and room-temperature crystal structures of the unusual phytochrome from the non-photosynthetic myxo-bacterium Stigmatella aurantiaca (SaBphP1) and reveals its role in the fruiting-body formation of this photomorphogenic bacterium. SaBphP1 lacks a conserved histidine (His) in the chromophore-binding domain that stabilizes the Pr state in the classical BphPs. Instead it contains a threonine (Thr), a feature that is restricted to several myxobacterial phytochromes and is not evolutionarily understood. SaBphP1 structures of the chromophore binding domain (CBD) and the complete photosensory core module (PCM) in wild-type and Thr-to-His mutant forms reveal details of the molecular mechanism of the Pr/Pfr transition associated with the physiological response of this myxobacterium to red light. Specifically, key structural differences in the CBD and PCM between the wild-type and the Thr-to-His mutant involve essential chromophore contacts with proximal amino acids, and point to how the photosignal is transduced through the rest of the protein, impacting the essential enzymatic activity in the photomorphogenic response of this myxobacterium.
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Affiliation(s)
| | - Andrei S. Halavaty
- Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Patricia Waltz
- Department of Biology, Northeastern Illinois University, Chicago, IL, USA
| | | | - Joseph Valera
- Department of Biology, Northeastern Illinois University, Chicago, IL, USA
| | - Gregory Tracy
- Department of Biology, Northeastern Illinois University, Chicago, IL, USA
| | - Kevin D. Gallagher
- Department of Biology, Northeastern Illinois University, Chicago, IL, USA
| | - Elin Claesson
- Department of Chemistry and Molecular Biology, University of Gothenburg, 40530 Gothenburg, Sweden
| | - Takanori Nakane
- Department of Biological Sciences, Graduate School of Science, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan
| | - Suraj Pandey
- Department of Physics, University of Wisconsin, Milwaukee, WI, USA
| | - Garrett Nelson
- Center for Applied Structural Discovery, Arizona State University, 85287 Tempe, AZ, USA
| | - Rie Tanaka
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, 679-5148 Hyogo, Japan
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Eriko Nango
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, 679-5148 Hyogo, Japan
| | - Eiichi Mizohata
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Shigeki Owada
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, 679-5148 Hyogo, Japan
| | - Kensure Tono
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, 679-5148 Hyogo, Japan
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Yasumasa Joti
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, 679-5148 Hyogo, Japan
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Angela C. Nugent
- Department of Biology, Northeastern Illinois University, Chicago, IL, USA
| | - Hardik Patel
- Department of Biology, Northeastern Illinois University, Chicago, IL, USA
| | - Ayesha Mapara
- Department of Biology, Northeastern Illinois University, Chicago, IL, USA
| | - James Hopkins
- Department of Biology, Northeastern Illinois University, Chicago, IL, USA
| | - Phu Duong
- Department of Biology, Northeastern Illinois University, Chicago, IL, USA
| | - Dorina Bizhga
- Department of Biology, Northeastern Illinois University, Chicago, IL, USA
| | | | - Rachael St. Peter
- Department of Biology, Northeastern Illinois University, Chicago, IL, USA
| | | | | | | | - Jay-How Yang
- Center for Applied Structural Discovery, Arizona State University, 85287 Tempe, AZ, USA
| | - Petra Edlund
- Department of Chemistry and Molecular Biology, University of Gothenburg, 40530 Gothenburg, Sweden
| | - Heikki Takala
- Faculty of Medicine, Anatomy, University of Helsinki, 00014 Helsinki, Finland
- Nanoscience Center, Department of Biological and Environmental Sciences, University of Jyvaskyla, 40014 Jyvaskyla, Finland
| | - Janne Ihalainen
- Nanoscience Center, Department of Biological and Environmental Sciences, University of Jyvaskyla, 40014 Jyvaskyla, Finland
| | | | - Tyler Norwood
- Department of Physics, University of Wisconsin, Milwaukee, WI, USA
| | - Ishwor Poudyal
- Department of Physics, University of Wisconsin, Milwaukee, WI, USA
| | - Petra Fromme
- Center for Applied Structural Discovery, Arizona State University, 85287 Tempe, AZ, USA
| | - John C. H. Spence
- Center for Applied Structural Discovery, Arizona State University, 85287 Tempe, AZ, USA
| | - Keith Moffat
- Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, IL, USA
| | - Sebastian Westenhoff
- Department of Chemistry and Molecular Biology, University of Gothenburg, 40530 Gothenburg, Sweden
| | - Marius Schmidt
- Department of Physics, University of Wisconsin, Milwaukee, WI, USA
| | - Emina A. Stojković
- Department of Biology, Northeastern Illinois University, Chicago, IL, USA
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29
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Kirpich JS, Mix LT, Martin SS, Rockwell NC, Lagarias JC, Larsen DS. Protonation Heterogeneity Modulates the Ultrafast Photocycle Initiation Dynamics of Phytochrome Cph1. J Phys Chem Lett 2018; 9:3454-3462. [PMID: 29874080 PMCID: PMC6247788 DOI: 10.1021/acs.jpclett.8b01133] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Phytochrome proteins utilize ultrafast photoisomerization of a linear tetrapyrrole chromophore to detect the ratio of red to far-red light. Femtosecond photodynamics in the PAS-GAF-PHY photosensory core of the Cph1 phytochrome from Synechocystis sp. PCC6803 (Cph1Δ) were resolved with a dual-excitation-wavelength-interleaved pump-probe (DEWI) approach with two excitation wavelengths (600 and 660 nm) at three pH values (6.5, 8.0, and 9.0). Observed spectral and kinetic heterogeneity in the excited-state dynamics were described with a self-consistent model comprised of three spectrally distinct populations with different protonation states (Pr-I, Pr-II, and Pr-III), each composed of multiple kinetically distinct subpopulations. Apparent partitioning among these populations is dictated by pH, temperature, and excitation wavelength. Our studies provide insight into photocycle initiation dynamics at physiological temperatures, implicate the low-pH/low-temperature Pr-I state as the photoactive state in vitro, and implicate an internal hydrogen-bonding network in regulating the photochemical quantum yield.
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Affiliation(s)
- Julia S. Kirpich
- Department of Chemistry, University of California, Davis, One Shields Ave, Davis, 95616
| | - L. Tyler Mix
- Department of Chemistry, University of California, Davis, One Shields Ave, Davis, 95616
| | - Shelley S. Martin
- Department of Molecular and Cell Biology, University of California, Davis, One Shields Ave, Davis, CA, 95616
| | - Nathan C. Rockwell
- Department of Molecular and Cell Biology, University of California, Davis, One Shields Ave, Davis, CA, 95616
| | - J. Clark Lagarias
- Department of Molecular and Cell Biology, University of California, Davis, One Shields Ave, Davis, CA, 95616
| | - Delmar S. Larsen
- Department of Chemistry, University of California, Davis, One Shields Ave, Davis, 95616
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30
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Correlating structural and photochemical heterogeneity in cyanobacteriochrome NpR6012g4. Proc Natl Acad Sci U S A 2018; 115:4387-4392. [PMID: 29632180 DOI: 10.1073/pnas.1720682115] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Phytochrome photoreceptors control plant growth, development, and the shade avoidance response that limits crop yield in high-density agricultural plantings. Cyanobacteriochromes (CBCRs) are distantly related photosensory proteins that control cyanobacterial metabolism and behavior in response to light. Photoreceptors in both families reversibly photoconvert between two photostates via photoisomerization of linear tetrapyrrole (bilin) chromophores. Spectroscopic and biochemical studies have demonstrated heterogeneity in both photostates, but the structural basis for such heterogeneity remains unclear. We report solution NMR structures for both photostates of the red/green CBCR NpR6012g4 from Nostoc punctiforme In addition to identifying structural changes accompanying photoconversion, these structures reveal structural heterogeneity for residues Trp655 and Asp657 in the red-absorbing NpR6012g4 dark state, yielding two distinct environments for the phycocyanobilin chromophore. We use site-directed mutagenesis and fluorescence and absorbance spectroscopy to assign an orange-absorbing population in the NpR6012g4 dark state to the minority configuration for Asp657. This population does not undergo full, productive photoconversion, as shown by time-resolved spectroscopy and absorption spectroscopy at cryogenic temperature. Our studies thus elucidate the spectral and photochemical consequences of structural heterogeneity in a member of the phytochrome superfamily, insights that should inform efforts to improve photochemical or fluorescence quantum yields in the phytochrome superfamily.
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31
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Buhrke D, Kuhlmann U, Michael N, Hildebrandt P. The Photoconversion of Phytochrome Includes an Unproductive Shunt Reaction Pathway. Chemphyschem 2018; 19:566-570. [DOI: 10.1002/cphc.201701311] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Indexed: 11/08/2022]
Affiliation(s)
- David Buhrke
- Institut für Chemie, Sekr. PC14; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Germany
| | - Uwe Kuhlmann
- Institut für Chemie, Sekr. PC14; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Germany
| | - Norbert Michael
- Institut für Chemie, Sekr. PC14; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Germany
| | - Peter Hildebrandt
- Institut für Chemie, Sekr. PC14; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Germany
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32
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Lenngren N, Edlund P, Takala H, Stucki-Buchli B, Rumfeldt J, Peshev I, Häkkänen H, Westenhoff S, Ihalainen JA. Coordination of the biliverdin D-ring in bacteriophytochromes. Phys Chem Chem Phys 2018; 20:18216-18225. [DOI: 10.1039/c8cp01696h] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Vibrational spectroscopy and crystallography experiments provide a basis for understanding the isomerization reaction in phytochrome proteins.
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Affiliation(s)
- Nils Lenngren
- Department of Biological and Environmental Sciences
- Nanoscience Center
- University of Jyväskylä
- Finland
| | - Petra Edlund
- Department of Chemistry and Molecular Biology
- Biochemistry and Biophysics
- University of Gothenburg
- SE-40530 Gothenburg
- Sweden
| | - Heikki Takala
- Department of Biological and Environmental Sciences
- Nanoscience Center
- University of Jyväskylä
- Finland
- University of Helsinki
| | - Brigitte Stucki-Buchli
- Department of Biological and Environmental Sciences
- Nanoscience Center
- University of Jyväskylä
- Finland
| | - Jessica Rumfeldt
- Department of Biological and Environmental Sciences
- Nanoscience Center
- University of Jyväskylä
- Finland
| | - Ivan Peshev
- Department of Biological and Environmental Sciences
- Nanoscience Center
- University of Jyväskylä
- Finland
| | - Heikki Häkkänen
- Department of Biological and Environmental Sciences
- Nanoscience Center
- University of Jyväskylä
- Finland
| | - Sebastian Westenhoff
- Department of Chemistry and Molecular Biology
- Biochemistry and Biophysics
- University of Gothenburg
- SE-40530 Gothenburg
- Sweden
| | - Janne A. Ihalainen
- Department of Biological and Environmental Sciences
- Nanoscience Center
- University of Jyväskylä
- Finland
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33
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Abstract
Channelrhodopsin (ChR) is a key protein of the optogenetic toolkit. C1C2, a functional chimeric protein of Chlamydomonas reinhardtii ChR1 and ChR2, is the only ChR whose crystal structure has been solved, and thus uniquely suitable for structure-based analysis. We report C1C2 photoreaction dynamics with ultrafast transient absorption and multi-pulse spectroscopy combined with target analysis and structure-based hybrid quantum mechanics/molecular mechanics calculations. Two relaxation pathways exist on the excited (S1) state through two conical intersections CI1 and CI2, that are reached via clockwise and counter-clockwise rotations: (i) the C13=C14 isomerization path with 450 fs via CI1 and (ii) a relaxation path to the initial ground state with 2.0 ps and 11 ps via CI2, depending on the hydrogen-bonding network, hence indicating active-site structural heterogeneity. The presence of the additional conical intersection CI2 rationalizes the relatively low quantum yield of photoisomerization (30 ± 3%), reported here. Furthermore, we show the photoreaction dynamics from picoseconds to seconds, characterizing the complete photocycle of C1C2.
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34
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Hontani Y, Shcherbakova DM, Baloban M, Zhu J, Verkhusha VV, Kennis JTM. Bright blue-shifted fluorescent proteins with Cys in the GAF domain engineered from bacterial phytochromes: fluorescence mechanisms and excited-state dynamics. Sci Rep 2016; 6:37362. [PMID: 27857208 PMCID: PMC5114657 DOI: 10.1038/srep37362] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Accepted: 10/25/2016] [Indexed: 11/21/2022] Open
Abstract
Near-infrared fluorescent proteins (NIR FPs) engineered from bacterial phytochromes (BphPs) are of great interest for in vivo imaging. They utilize biliverdin (BV) as a chromophore, which is a heme degradation product, and therefore they are straightforward to use in mammalian tissues. Here, we report on fluorescence properties of NIR FPs with key alterations in their BV binding sites. BphP1-FP, iRFP670 and iRFP682 have Cys residues in both PAS and GAF domains, rather than in the PAS domain alone as in wild-type BphPs. We found that NIR FP variants with Cys in the GAF or with Cys in both PAS and GAF show blue-shifted emission with long fluorescence lifetimes. In contrast, mutants with Cys in the PAS only or no Cys residues at all exhibit red-shifted emission with shorter lifetimes. Combining these results with previous biochemical and BphP1-FP structural data, we conclude that BV adducts bound to Cys in the GAF are the origin of bright blue-shifted fluorescence. We propose that the long fluorescence lifetime follows from (i) a sterically more constrained thioether linkage, leaving less mobility for ring A than in canonical BphPs, and (ii) that π-electron conjugation does not extend on ring A, making excited-state deactivation less sensitive to ring A mobility.
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Affiliation(s)
- Yusaku Hontani
- Department of Physics and Astronomy, VU University Amsterdam, Amsterdam 1081 HV, The Netherlands
| | - Daria M Shcherbakova
- Department of Anatomy and Structural Biology and Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - Mikhail Baloban
- Department of Anatomy and Structural Biology and Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - Jingyi Zhu
- Department of Physics and Astronomy, VU University Amsterdam, Amsterdam 1081 HV, The Netherlands
| | - Vladislav V Verkhusha
- Department of Anatomy and Structural Biology and Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, Bronx, New York 10461, USA.,Department of Biochemistry and Developmental Biology, Faculty of Medicine, University of Helsinki, Helsinki 00290, Finland
| | - John T M Kennis
- Department of Physics and Astronomy, VU University Amsterdam, Amsterdam 1081 HV, The Netherlands
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35
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Kosumi D, Horibe T, Sugisaki M, Cogdell RJ, Hashimoto H. Photoprotection Mechanism of Light-Harvesting Antenna Complex from Purple Bacteria. J Phys Chem B 2016; 120:951-6. [PMID: 26800035 DOI: 10.1021/acs.jpcb.6b00121] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Photosynthetic light-harvesting apparatus efficiently capture sunlight and transfer the energy to reaction centers, while they safely dissipate excess energy to surrounding environments for a protection of their organisms. In this study, we performed pump-probe spectroscopic measurements with a temporal window ranging from femtosecond to submillisecond on the purple bacterial antenna complex LH2 from Rhodobacter sphaeroides 2.4.1 to clarify its photoprotection functions. The observed excited state dynamics in the time range from subnanosecond to microsecond exhibits that the triplet-triplet excitation energy transfer from bacteriochlorophyll a to carotenoid takes place with a time constant of 16.7 ns. Furthermore, ultrafast spectroscopic data suggests that a molecular assembly of bacteriochlorophyll a in LH2 efficiently suppresses a generation of triple bacteriochlorophyll a.
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Affiliation(s)
- Daisuke Kosumi
- Institute of Pulsed Power Science, Kumamoto University , 2-39-1 Kurokami, Chuo-ku Kumamoto, 860-8555 Japan.,Department of Physics, Graduate School of Science and Technology, Kumamoto University , Chuo-ku Kumamoto, 860-8555 Japan
| | - Tomoko Horibe
- Department of Applied Chemistry for Environment, Faculty of Science and Technology, Kwansei Gakuin University , 2-1, Gakuen, Sanda, Hyogo 669-1337 Japan
| | - Mitsuru Sugisaki
- Department of Physics, Graduate School of Science, Osaka City University , 3-3-138 Sugimoto, Sumiyoshi-ku Osaka 558-8585, Japan
| | - Richard J Cogdell
- Glasgow Biomedical Research Centre, University of Glasgow, 126 University Place , Glasgow, G12 8QQ, Scotland, U.K
| | - Hideki Hashimoto
- Department of Applied Chemistry for Environment, Faculty of Science and Technology, Kwansei Gakuin University , 2-1, Gakuen, Sanda, Hyogo 669-1337 Japan
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Falklöf O, Durbeej B. Steric Effects Govern the Photoactivation of Phytochromes. Chemphyschem 2016; 17:954-7. [DOI: 10.1002/cphc.201501080] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Indexed: 11/05/2022]
Affiliation(s)
- Olle Falklöf
- Division of Theoretical Chemistry, IFM; Linköping University; 581 83 Linköping Sweden
| | - Bo Durbeej
- Division of Theoretical Chemistry, IFM; Linköping University; 581 83 Linköping Sweden
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Ihalainen JA, Takala H, Lehtivuori H. Fast Photochemistry of Prototypical Phytochromes-A Species vs. Subunit Specific Comparison. Front Mol Biosci 2015; 2:75. [PMID: 26779488 PMCID: PMC4689126 DOI: 10.3389/fmolb.2015.00075] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2015] [Accepted: 12/07/2015] [Indexed: 11/13/2022] Open
Abstract
Phytochromes are multi-domain red light photosensor proteins, which convert red light photons to biological activity utilizing the multitude of structural and chemical reactions. The steady increase in structural information obtained from various bacteriophytochromes has increased understanding about the functional mechanism of the photochemical processes of the phytochromes. Furthermore, a number of spectroscopic studies have revealed kinetic information about the light-induced reactions. The spectroscopic changes are, however, challenging to connect with the structural changes of the chromophore and the protein environment, as the excited state properties of the chromophores are very sensitive to the small structural and chemical changes of their environment. In this article, we concentrate on the results of ultra-fast spectroscopic experiments which reveal information about the important initial steps of the photoreactions of the phytochromes. We survey the excited state properties obtained during the last few decades. The differences in kinetics between different research laboratories are traditionally related to the differences of the studied species. However, we notice that the variation in the excited state properties depends on the subunit composition of the protein as well. This observation illustrates a feedback mechanism from the other domains to the chromophore. We propose that two feedback routes exist in phytochromes between the chromophore and the remotely located effector domain. The well-known connection between the subunits is the so-called tongue region, which changes its secondary structure while changing the light-activated state of the system. The other feedback route which we suggest is less obvious, it is made up of several water molecules ranging from the dimer interface to the vicinity of the chromophore, allowing even proton transfer reactions nearby the chromophore.
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Affiliation(s)
- Janne A Ihalainen
- Department of Biological and Environmental Sciences, Nanoscience Center, University of Jyväskylä Jyväskylä, Finland
| | - Heikki Takala
- Department of Biological and Environmental Sciences, Nanoscience Center, University of JyväskyläJyväskylä, Finland; Department of Anatomy, Institute of Biomedicine, University of HelsinkiHelsinki, Finland
| | - Heli Lehtivuori
- Department of Biological and Environmental Sciences, Nanoscience Center, University of JyväskyläJyväskylä, Finland; Department of Physics, Nanoscience Center, University of JyväskyläJyväskylä, Finland
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Björling A, Berntsson O, Takala H, Gallagher KD, Patel H, Gustavsson E, St Peter R, Duong P, Nugent A, Zhang F, Berntsen P, Appio R, Rajkovic I, Lehtivuori H, Panman MR, Hoernke M, Niebling S, Harimoorthy R, Lamparter T, Stojković EA, Ihalainen JA, Westenhoff S. Ubiquitous Structural Signaling in Bacterial Phytochromes. J Phys Chem Lett 2015; 6:3379-83. [PMID: 26275765 DOI: 10.1021/acs.jpclett.5b01629] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The phytochrome family of light-switchable proteins has long been studied by biochemical, spectroscopic and crystallographic means, while a direct probe for global conformational signal propagation has been lacking. Using solution X-ray scattering, we find that the photosensory cores of several bacterial phytochromes undergo similar large-scale structural changes upon red-light excitation. The data establish that phytochromes with ordinary and inverted photocycles share a structural signaling mechanism and that a particular conserved histidine, previously proposed to be involved in signal propagation, in fact tunes photoresponse.
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Affiliation(s)
- Alexander Björling
- Department of Chemistry and Molecular Biology, University of Gothenburg , Box 462, 40530 Gothenburg, Sweden
| | - Oskar Berntsson
- Department of Chemistry and Molecular Biology, University of Gothenburg , Box 462, 40530 Gothenburg, Sweden
| | - Heikki Takala
- Department of Chemistry and Molecular Biology, University of Gothenburg , Box 462, 40530 Gothenburg, Sweden
- Nanoscience Center, Department of Biological and Environmental Science, University of Jyväskylä , 40014 Jyväskylä, Finland
| | - Kevin D Gallagher
- Department of Biology, Northeastern Illinois University , 5500 North St. Louis Avenue, Chicago, Illinois 60625, United States
| | - Hardik Patel
- Department of Biology, Northeastern Illinois University , 5500 North St. Louis Avenue, Chicago, Illinois 60625, United States
| | - Emil Gustavsson
- Department of Chemistry and Molecular Biology, University of Gothenburg , Box 462, 40530 Gothenburg, Sweden
| | - Rachael St Peter
- Department of Biology, Northeastern Illinois University , 5500 North St. Louis Avenue, Chicago, Illinois 60625, United States
| | - Phu Duong
- Department of Biology, Northeastern Illinois University , 5500 North St. Louis Avenue, Chicago, Illinois 60625, United States
| | - Angela Nugent
- Department of Biology, Northeastern Illinois University , 5500 North St. Louis Avenue, Chicago, Illinois 60625, United States
| | - Fan Zhang
- Botanical Institute, Karlsruhe Institute of Technology KIT , Kaiserstr. 2, 76131 Karlsruhe, Germany
| | - Peter Berntsen
- Department of Chemistry and Molecular Biology, University of Gothenburg , Box 462, 40530 Gothenburg, Sweden
- Centre for Advanced Molecular Imaging, La Trobe Institute for Molecular Science, La Trobe University , Melbourne, Victoria 3086, Australia
| | - Roberto Appio
- MAX IV Laboratory, Lund University , P.O. Box 118, Lund SE-221 00, Sweden
| | - Ivan Rajkovic
- Paul Scherrer Institut , 5232 Villigen PSI, Switzerland
| | - Heli Lehtivuori
- Nanoscience Center, Department of Biological and Environmental Science, University of Jyväskylä , 40014 Jyväskylä, Finland
| | - Matthijs R Panman
- Department of Chemistry and Molecular Biology, University of Gothenburg , Box 462, 40530 Gothenburg, Sweden
| | - Maria Hoernke
- Department of Chemistry and Molecular Biology, University of Gothenburg , Box 462, 40530 Gothenburg, Sweden
| | - Stephan Niebling
- Department of Chemistry and Molecular Biology, University of Gothenburg , Box 462, 40530 Gothenburg, Sweden
| | - Rajiv Harimoorthy
- Department of Chemistry and Molecular Biology, University of Gothenburg , Box 462, 40530 Gothenburg, Sweden
| | - Tilman Lamparter
- Botanical Institute, Karlsruhe Institute of Technology KIT , Kaiserstr. 2, 76131 Karlsruhe, Germany
| | - Emina A Stojković
- Department of Biology, Northeastern Illinois University , 5500 North St. Louis Avenue, Chicago, Illinois 60625, United States
| | - Janne A Ihalainen
- Nanoscience Center, Department of Biological and Environmental Science, University of Jyväskylä , 40014 Jyväskylä, Finland
| | - Sebastian Westenhoff
- Department of Chemistry and Molecular Biology, University of Gothenburg , Box 462, 40530 Gothenburg, Sweden
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