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Paul S, Roy U, Böckers M, Neugebauer J, Alia A, Matysik J. 15N photo-CIDNP MAS NMR analysis of a bacterial photosynthetic reaction center of Rhodobacter sphaeroides wildtype. J Chem Phys 2019; 151:195101. [PMID: 31757137 DOI: 10.1063/1.5128783] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The solid-state photochemically induced dynamic nuclear polarization (photo-CIDNP) effect has been studied in a quinone-depleted uniformly (u-)13C,15N-labeled photosynthetic reaction center (RC) protein from purple bacterium Rhodobacter (R.) sphaeroides wild type (WT). As a method for investigation, solid-state 15N NMR under magic-angle spinning (MAS) is applied under both continuous illumination (steady state) and nanosecond-laser flashes (time-resolved). While all previous 15N photo-CIDNP MAS NMR studies on the purple bacterial RC used the carotenoid-less mutant R26, this is the first using WT samples. The absence of further photo-CIDNP mechanisms (compared to R26) and various couplings (compared to 13C NMR experiments on 13C-labeled samples) allows the simplification of the spin-system. We report 15N signals of the three cofactors forming the spin-correlated radical pair (SCRP) and, based on density-functional theory calculations, their assignment. The simulation of photo-CIDNP intensities and time-resolved 15N photo-CIDNP MAS NMR data matches well to the frame of the mechanistic interpretation. Three spin-chemical processes, namely, radical pair mechanism, three spin mixing, and differential decay, generate emissive (negative) 15N polarization in the singlet decay channel and absorptive (positive) polarization in the triplet decay channel of the SCRP. The absorptive 15N polarization of the triplet decay channel is transiently obscured during the lifetime of the triplet state of the carotenoid (3Car); therefore, the observed 15N signals are strongly emissive. Upon decay of 3Car, the transiently obscured polarization becomes visible by reducing the excess of emissive polarization. After the decline of 3Car, the remaining nuclear hyperpolarization decays with nuclear T1 relaxation kinetics.
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Affiliation(s)
- Shubhajit Paul
- Institut für Analytische Chemie, Universität Leipzig, Linnéstr. 3, D-04103 Leipzig, Germany
| | - Upasana Roy
- Institut für Analytische Chemie, Universität Leipzig, Linnéstr. 3, D-04103 Leipzig, Germany
| | - Michael Böckers
- Organisch-Chemisches Institut and Center for Multiscale Theory and Computation, Universität Münster, Corrensstraße 40, D-48149 Münster, Germany
| | - Johannes Neugebauer
- Organisch-Chemisches Institut and Center for Multiscale Theory and Computation, Universität Münster, Corrensstraße 40, D-48149 Münster, Germany
| | - A Alia
- Institut für Medizinische Physik und Biophysik, Universität Leipzig, Härtelstr. 16, D-04107 Leipzig, Germany
| | - Jörg Matysik
- Institut für Analytische Chemie, Universität Leipzig, Linnéstr. 3, D-04103 Leipzig, Germany
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2
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Bielytskyi P, Gräsing D, Zahn S, Mote KR, Alia A, Madhu PK, Matysik J. Assignment of NMR resonances of protons covalently bound to photochemically active cofactors in photosynthetic reaction centers by 13C- 1H photo-CIDNP MAS-J-HMQC experiment. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2019; 298:64-76. [PMID: 30529893 DOI: 10.1016/j.jmr.2018.11.013] [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: 11/02/2018] [Revised: 11/27/2018] [Accepted: 11/28/2018] [Indexed: 06/09/2023]
Abstract
Modified versions of through-bond heteronuclear correlation (HETCOR) experiments are presented to take advantage of the light-induced hyperpolarization that occurs on 13C nuclei due to the solid-state photochemically induced dynamic nuclear polarization (photo-CIDNP) effect. Such 13C-1H photo-CIDNP MAS-J-HMQC and photo-CIDNP MAS-J-HSQC experiments are applied to acquire the 2D 13C-1H correlation spectra of selectively 13C-labeled photochemically active cofactors in the frozen quinone-blocked photosynthetic reaction center (RC) of the purple bacterium Rhodobacter (R.) sphaeroides wild-type (WT). Resulting spectra contain no correlation peaks arising from the protein backbone, which greatly simplifies the assignment of aliphatic region. Based on the photo-CIDNP MAS-J-HMQC NMR experiment, we obtained assignment of selective 1H NMR resonances of the cofactors involved in the electron transfer process in the RC and compared them with values theoretically predicted by density functional theory (DFT) calculation as well as with the chemical shifts obtained from monomeric cofactors in the solution. We also compared proton chemical shifts obtained by photo-CIDNP MAS-J-HMQC experiment under continuous illumination with the ones obtained in dark by classical cross-polarization (CP) HETCOR. We expect that the proposed approach will become a method of choice for obtaining 1H chemical shift maps of the active cofactors in photosynthetic RCs and will aid the interpretation of heteronuclear spin-torch experiments.
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Affiliation(s)
- Pavlo Bielytskyi
- Institut für Analytische Chemie, Universität Leipzig, Linnéstraße 3, D-04103 Leipzig, Germany
| | - Daniel Gräsing
- Institut für Analytische Chemie, Universität Leipzig, Linnéstraße 3, D-04103 Leipzig, Germany
| | - Stefan Zahn
- Leibniz Institute of Surface Engineering (IOM), Permoserstraße 15, D-04318 Leipzig, Germany
| | - Kaustubh R Mote
- TIFR Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, 36/P Gopanpally Village, Serilingampally Mandal, Ranga Reddy District, Hyderabad 500107, India
| | - A Alia
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2301 RA Leiden, the Netherlands; Institut für Medizinische Physik und Biophysik, Universität Leipzig, Härtelstr. 16-18, D-04107 Leipzig, Germany
| | - P K Madhu
- TIFR Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, 36/P Gopanpally Village, Serilingampally Mandal, Ranga Reddy District, Hyderabad 500107, India
| | - Jörg Matysik
- Institut für Analytische Chemie, Universität Leipzig, Linnéstraße 3, D-04103 Leipzig, Germany.
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3
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Bielytskyi P, Gräsing D, Mote KR, Sai Sankar Gupta KB, Vega S, Madhu PK, Alia A, Matysik J. 13C → 1H transfer of light-induced hyperpolarization allows for selective detection of protons in frozen photosynthetic reaction center. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2018; 293:82-91. [PMID: 29909081 DOI: 10.1016/j.jmr.2018.06.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Revised: 06/06/2018] [Accepted: 06/07/2018] [Indexed: 05/14/2023]
Abstract
In the present study, we exploit the light-induced hyperpolarization occurring on 13C nuclei due to the solid-state photochemically induced dynamic nuclear polarization (photo-CIDNP) effect to boost the NMR signal intensity of selected protons via inverse cross-polarization. Such hyperpolarization transfer is implemented into 1H-detected two-dimensional 13C-1H correlation magic-angle-spinning (MAS) NMR experiment to study protons in frozen photosynthetic reaction centers (RCs). As a first trial, the performance of such an experiment is tested on selectively 13C labeled RCs from the purple bacteria of Rhodobacter sphaeroides. We observed response from the protons belonging to the photochemically active cofactors in their native protein environment. Such an approach is a potential heteronuclear spin-torch experiment which could be complementary to the classical heteronuclear correlation (HETCOR) experiments for mapping proton chemical shifts of photosynthetic cofactors and to understand the role of the proton pool around the electron donors in the electron transfer process occurring during photosynthesis.
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Affiliation(s)
- Pavlo Bielytskyi
- Institut für Analytische Chemie, Universität Leipzig, Linnéstraße 3, D-04103 Leipzig, Germany
| | - Daniel Gräsing
- Institut für Analytische Chemie, Universität Leipzig, Linnéstraße 3, D-04103 Leipzig, Germany
| | - Kaustubh R Mote
- TIFR Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, 36/P Gopanpally Village, Serilingampally Mandal, Ranga Reddy District, Hyderabad 500107, India
| | | | - Shimon Vega
- Department of Chemical Physics, Weizmann Institute of Science, 76100 Rechovot, Israel
| | - P K Madhu
- TIFR Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, 36/P Gopanpally Village, Serilingampally Mandal, Ranga Reddy District, Hyderabad 500107, India; Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India
| | - A Alia
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2301 RA Leiden, The Netherlands; Institut für Medizinische Physik und Biophysik, Universität Leipzig, Härtelstr. 16-18, D-04107 Leipzig, Germany
| | - Jörg Matysik
- Institut für Analytische Chemie, Universität Leipzig, Linnéstraße 3, D-04103 Leipzig, Germany.
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4
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Poddubnyy VV, Glebov IO, Eremin VV. Protein Vibration Effects on Primary Electron Transfer Dynamics in Rhodobacter sphaeroides Photosynthetic Reaction Center. J Phys Chem B 2017; 121:10639-10647. [PMID: 29095621 DOI: 10.1021/acs.jpcb.7b09321] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Primary electron transfer (ET) in the chromophore subsystem in a bacterial reaction center (RC) is a unique process, and is coupled with the protein motion, which, like the ET, is caused by photoexcitation of these chromophores. ET is also coupled with dissipative processes, which are caused by interaction between chromophores and vibrations of its surrounding protein. We propose a new dynamics calculation method that accounts for both these effects of protein vibrations. Within this method, the photoinduced protein motion causes an addition of coherent component to the ET rate. We performed dynamics calculation using this method and parameters, which were determined from the ab initio wave functions of the chromophore subsystem and protein normal vibrational modes. We showed that it is this protein motion that causes oscillations in the time-dependencies of stimulated emission intensities and of absorption at 1020 nm. Moreover, the latter oscillations are related to the coherent component of the ET rate.
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Affiliation(s)
- Vladimir V Poddubnyy
- Department of Chemistry, Lomonosov Moscow State University , Moscow, Russia 119991
| | - Ilya O Glebov
- Department of Chemistry, Lomonosov Moscow State University , Moscow, Russia 119991
| | - Vadim V Eremin
- Department of Chemistry, Lomonosov Moscow State University , Moscow, Russia 119991
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5
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Najdanova M, Gräsing D, Alia A, Matysik J. Analysis of the Electronic Structure of the Special Pair of a Bacterial Photosynthetic Reaction Center by 13 C Photochemically Induced Dynamic Nuclear Polarization Magic-Angle Spinning NMR Using a Double-Quantum Axis. Photochem Photobiol 2017; 94:69-80. [PMID: 28746728 DOI: 10.1111/php.12812] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 07/04/2017] [Indexed: 11/28/2022]
Abstract
The origin of the functional symmetry break in bacterial photosynthesis challenges since several decades. Although structurally very similar, the two branches of cofactors in the reaction center (RC) protein complex act very differently. Upon photochemical excitation, an electron is transported along one branch, while the other remains inactive. Photochemically induced dynamic nuclear polarization (photo-CIDNP) magic-angle spinning (MAS) 13 C NMR revealed that the two bacteriochlorophyll cofactors forming the "Special Pair" donor dimer are already well distinguished in the electronic ground state. These previous studies are relying solely on 13 C-13 C correlation experiments as radio-frequency-driven recoupling (RFDR) and dipolar-assisted rotational resonance (DARR). Obviously, the chemical-shift assignment is difficult in a dimer of tetrapyrrole macrocycles, having eight pyrrole rings of similar chemical shifts. To overcome this problem, an INADEQUATE type of experiment using a POST C7 symmetry-based approach is applied to selectively isotope-labeled bacterial RC of Rhodobacter (R.) sphaeroides wild type (WT). We, therefore, were able to distinguish unresolved sites of the macromolecular dimer. The obtained chemical-shift pattern is in-line with a concentric assembly of negative charge within the common center of the Special Pair supermolecule in the electronic ground state.
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Affiliation(s)
- Marija Najdanova
- Institute of Analytical Chemistry, University of Leipzig, Leipzig, Germany
| | - Daniel Gräsing
- Institute of Analytical Chemistry, University of Leipzig, Leipzig, Germany
| | - A Alia
- Institute of Medical Physics and Biophysics, University of Leipzig, Leipzig, Germany.,Leiden Institute of Chemistry, Leiden University, Leiden, The Netherlands
| | - Jörg Matysik
- Institute of Analytical Chemistry, University of Leipzig, Leipzig, Germany
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6
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Jankowiak R, Rancova O, Chen J, Kell A, Saer RG, Beatty JT, Abramavicius D. Mutation-Induced Changes in the Protein Environment and Site Energies in the (M)L214G Mutant of the Rhodobacter sphaeroides Bacterial Reaction Center. J Phys Chem B 2016; 120:7859-71. [PMID: 27458891 DOI: 10.1021/acs.jpcb.6b06151] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This work focuses on the low-temperature (5 K) photochemical (transient) hole-burned (HB) spectra within the P870 absorption band, and their theoretical analysis, for the (M)L214G mutant of the photosynthetic Rhodobacter sphaeroides bacterial reaction center (bRC). To provide insight into system-bath interactions of the bacteriochlorophyll a (BChl a) special pair, i.e., P870, in the mutated bRC, the optical line shape function for the P870 band is calculated numerically. On the basis of the modeling studies, we demonstrate that (M)L214G mutation leads to a heterogeneous population of bRCs with modified (increased) total electron-phonon coupling strength of the special pair BChl a and larger inhomogeneous broadening. Specifically, we show that after mutation in the (M)L214G bRC a large fraction (∼50%) of the bacteriopheophytin (HA) chromophores shifts red and the 800 nm absorption band broadens, while the remaining fraction of HA cofactors retains nearly the same site energy as HA in the wild-type bRC. Modeling using these two subpopulations allowed for fits of the absorption and nonresonant (transient) HB spectra of the mutant bRC in the charge neutral, oxidized, and charge-separated states using the Frenkel exciton Hamiltonian, providing new insight into the mutant's complex electronic structure. Although the average (M)L214G mutant quantum efficiency of P(+)QA(-) state formation seems to be altered in comparison with the wild-type bRC, the average electron transfer time (measured via resonant transient HB spectra within the P870 band) was not affected. Thus, mutation in the vicinity of the electron acceptor (HA) does not tune the charge separation dynamics. Finally, quenching of the (M)L214G mutant excited states by P(+) is addressed by persistent HB spectra burned within the B band in chemically oxidized samples.
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Affiliation(s)
| | - Olga Rancova
- Department of Theoretical Physics, Vilnius University , 10222 Vilnius, Lithuania
| | | | | | - Rafael G Saer
- Department of Microbiology and Immunology, University of British Columbia , Vancouver, BC V6T 1Z3, Canada
| | - J Thomas Beatty
- Department of Microbiology and Immunology, University of British Columbia , Vancouver, BC V6T 1Z3, Canada
| | - Darius Abramavicius
- Department of Theoretical Physics, Vilnius University , 10222 Vilnius, Lithuania
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7
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Paul S, Bode BE, Matysik J, Alia A. Photochemically Induced Dynamic Nuclear Polarization Observed by Solid-State NMR in a Uniformly (13)C-Isotope-Labeled Photosynthetic Reaction Center. J Phys Chem B 2015; 119:13897-903. [PMID: 26110356 DOI: 10.1021/acs.jpcb.5b04542] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A sample of solubilized and quinone-depleted reaction centers from the purple bacterium Rhodobacter (R.) sphaeroides wild type has been prepared entirely (13)C and (15)N isotope labeled at all positions of the protein as well as of the cofactors. In this sample, the occurrence of the solid-state photo-CIDNP (photochemically induced dynamic nuclear polarization) effect has been probed by (13)C solid-state magic-angle spinning NMR under illumination. Under continuous illumination, signal intensities are modified by the three-spin mixing (TSM) mechanism. Time-resolved illumination experiments reveal the occurrence of light-induced nuclear polarization on the time scale of hundreds of microseconds, initially dominated by the transient polarization of the singlet branch of the radical-pair mechanism. A first kinetic analysis shows that the lifetime of the polarization from the singlet branch, indicated by the enhanced absorptive intensities of the signals from aliphatic carbons, is significantly extended. Upon arrival of the polarization from the triplet decay branch, emissive polarization caused by the TSM mechanism is observed. Also, this arrival is significantly delayed. The decay of TSM polarization occurs in two steps, assigned to intra- and intermolecular spin diffusion.
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Affiliation(s)
- Shubhajit Paul
- Universität Leipzig , Institut für Analytische Chemie, Linnéstr. 3, D-04103 Leipzig, Germany
| | - Bela E Bode
- EaStCHEM School of Chemistry, Biomedical Sciences Research Complex and Centre of Magnetic Resonance, University of St Andrews , St Andrews KY16 9ST, Scotland
| | - Jörg Matysik
- Universität Leipzig , Institut für Analytische Chemie, Linnéstr. 3, D-04103 Leipzig, Germany
| | - A Alia
- Universität Leipzig , Institut für Medizinische Physik und Biophysik, Härtelstr. 16, D-04107 Leipzig, Germany.,Gorlaeus Laboratoria, Leiden Institute of Chemistry , Einsteinweg 55, P.O. Box 9502, 2300 RA Leiden, The Netherlands
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8
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Glebov I, Poddubnyy V, Eremin V. Evidence for the purely electronic character of primary electron transfer in purple bacteriaRh. Sphaeroides. Mol Phys 2015. [DOI: 10.1080/00268976.2015.1013070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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9
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Sai Sankar Gupta KB, Daviso E, Jeschke G, Alia A, Ernst M, Matysik J. Spectral editing through laser-flash excitation in two-dimensional photo-CIDNP MAS NMR experiments. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2014; 246:9-17. [PMID: 25063951 DOI: 10.1016/j.jmr.2014.06.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Revised: 06/08/2014] [Accepted: 06/17/2014] [Indexed: 05/14/2023]
Abstract
In solid-state photochemically induced dynamic nuclear polarization (photo-CIDNP) MAS NMR experiments, strong signal enhancement is observed from molecules forming a spin-correlated radical pair in a rigid matrix. Two-dimensional (13)C-(13)C dipolar-assisted rotational resonance (DARR) photo-CIDNP MAS NMR experiments have been applied to obtain exact chemical shift assignments from those cofactors. Under continuous illumination, the signals are enhanced via three-spin mixing (TSM) and differential decay (DD) and their intensity corresponds to the electron spin density in pz orbitals. In multiple-(13)C labelled samples, spin diffusion leads to propagation of signal enhancement to all (13)C spins. Under steady-state conditions, direct signal assignment is possible due to the uniform signal intensity. The original intensities, however, are inaccessible and the information of the local electron spin density is lost. Upon laser-flash illumination, the signal is enhanced via the classical radical pair mechanism (RPM). The obtained intensities are related to isotropic hyperfine interactions aiso and both enhanced absorptive and emissive lines can be observed due to differences in the sign of the local isotropic hyperfine interaction. Exploiting the mechanism of the polarization, selectivity can be increased by the novel time-resolved two-dimensional dipolar-assisted rotational resonance (DARR) MAS NMR experiment which simplifies the signal assignment compared to complex spectra of the same RCs obtained by continuous illumination. Here we present two-dimensional time-resolved photo-CIDNP MAS NMR experiments providing both directly: signal assignment and spectral editing by sign and strength of aiso. Hence, this experiment provides a direct key to the electronic structure of the correlated radical pair.
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Affiliation(s)
| | - Eugenio Daviso
- Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands; Francis Bitter Magnet Laboratory, Albany Street 150, NW14, Cambridge, MA 02139, USA
| | - Gunnar Jeschke
- ETH Zürich, Physical Chemistry, Wolfgang-Pauli-Strasse 10, 8093 Zürich, Switzerland
| | - A Alia
- Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands; Institut für Analytische Chemie, Universität Leipzig, Linnéstr. 3, 04103 Leipzig, Germany
| | - Matthias Ernst
- ETH Zürich, Physical Chemistry, Wolfgang-Pauli-Strasse 10, 8093 Zürich, Switzerland
| | - Jörg Matysik
- Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands; Institut für Analytische Chemie, Universität Leipzig, Linnéstr. 3, 04103 Leipzig, Germany.
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10
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Saggu M, Carter B, Zhou X, Faries K, Cegelski L, Holten D, Boxer SG, Kirmaier C. Putative hydrogen bond to tyrosine M208 in photosynthetic reaction centers from Rhodobacter capsulatus significantly slows primary charge separation. J Phys Chem B 2014; 118:6721-32. [PMID: 24902471 PMCID: PMC4064694 DOI: 10.1021/jp503422c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
![]()
Slow, ∼50
ps, P* → P+HA– electron
transfer is observed in Rhodobacter
capsulatus reaction centers (RCs) bearing the native
Tyr residue at M208 and the single amino acid change of isoleucine
at M204 to glutamic acid. The P* decay kinetics are unusually homogeneous
(single exponential) at room temperature. Comparative solid-state
NMR of [4′-13C]Tyr labeled wild-type and M204E RCs
show that the chemical shift of Tyr M208 is significantly altered
in the M204E mutant and in a manner consistent with formation of a
hydrogen bond to the Tyr M208 hydroxyl group. Models based on RC crystal
structure coordinates indicate that if such a hydrogen bond is formed
between the Glu at M204 and the M208 Tyr hydroxyl group, the −OH
would be oriented in a fashion expected (based on the calculations
by Alden et al., J. Phys. Chem.1996, 100, 16761–16770) to destabilize P+BA– in free energy. Alteration
of the environment of Tyr M208 and BA by Glu M204 via this
putative hydrogen bond has a powerful influence on primary charge
separation.
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Affiliation(s)
- Miguel Saggu
- Department of Chemistry, Stanford University , Stanford, California 94305-5012, United States
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11
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Sai Sankar Gupta KB, Alia A, de Groot HJ, Matysik J. Symmetry Break of Special Pair: Photochemically Induced Dynamic Nuclear Polarization NMR Confirms Control by Nonaromatic Substituents. J Am Chem Soc 2013; 135:10382-7. [DOI: 10.1021/ja402238w] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - A. Alia
- Institute
of Chemistry, Leiden University, P.O. Box
9502, 2300 RA Leiden, The
Netherlands
- Institut für Medizinische
Physik und Biophysik, Universität Leipzig, Härtelstraße 16-18, 04107 Leipzig, Germany
| | - Huub J.M. de Groot
- Institute
of Chemistry, Leiden University, P.O. Box
9502, 2300 RA Leiden, The
Netherlands
| | - Jörg Matysik
- Institute
of Chemistry, Leiden University, P.O. Box
9502, 2300 RA Leiden, The
Netherlands
- Institut für
Analytische
Chemie, Universität Leipzig, Linnèstr.
3, 04104 Leipzig, Germany
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12
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Sai Sankar Gupta KB, Alia A, Buda F, de Groot HJM, Matysik J. Bacteriopheophytin a in the active branch of the reaction center of rhodobacter sphaeroides is not disturbed by the protein matrix as shown by 13C photo-CIDNP MAS NMR. J Phys Chem B 2013; 117:3287-97. [PMID: 23452037 DOI: 10.1021/jp3121319] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The electronic structure of bacteriopheophytin a (BPhe a), the primary electron acceptor (ΦA) in photosynthetic reaction centers (RCs) of the purple bacterium Rhodobacter sphaeroides, is investigated by photochemically induced dynamic nuclear polarization (photo-CIDNP) magic-angle spinning (MAS) NMR spectroscopy at atomic resolution. By using various isotope labeling systems, introduced by adding different (13)C selectively labeled δ-aminolevulinic acid precursors in the growing medium of R. sphaeroides wild type (WT), we were able to extract light-induced (13)C NMR signals originating from the primary electron acceptor. The assignments are backed by theoretical calculations. By comparison of these chemical shifts to those obtained from monomeric BPhe a in solution, it is demonstrated that ΦA in the active branch appears to be electronically close to free bacteriopheophytin. Hence, there is little effect of the protein surrounding on the cofactor functionally which contributes with its standard redox potential to the electron transfer process that is asymmetric.
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13
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Saer RG, Hardjasa A, Rosell FI, Mauk AG, Murphy MEP, Beatty JT. Role of Rhodobacter sphaeroides Photosynthetic Reaction Center Residue M214 in the Composition, Absorbance Properties, and Conformations of HA and BA Cofactors. Biochemistry 2013; 52:2206-17. [DOI: 10.1021/bi400207m] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Rafael G. Saer
- Department
of Microbiology and Immunology and ‡Department of Biochemistry and Molecular Biology
and Centre for Blood Research, The University of British Columbia, 2350 Health Sciences Mall, Vancouver,
BC, Canada V6T 1Z3
| | - Amelia Hardjasa
- Department
of Microbiology and Immunology and ‡Department of Biochemistry and Molecular Biology
and Centre for Blood Research, The University of British Columbia, 2350 Health Sciences Mall, Vancouver,
BC, Canada V6T 1Z3
| | - Federico I. Rosell
- Department
of Microbiology and Immunology and ‡Department of Biochemistry and Molecular Biology
and Centre for Blood Research, The University of British Columbia, 2350 Health Sciences Mall, Vancouver,
BC, Canada V6T 1Z3
| | - A. Grant Mauk
- Department
of Microbiology and Immunology and ‡Department of Biochemistry and Molecular Biology
and Centre for Blood Research, The University of British Columbia, 2350 Health Sciences Mall, Vancouver,
BC, Canada V6T 1Z3
| | - Michael E. P. Murphy
- Department
of Microbiology and Immunology and ‡Department of Biochemistry and Molecular Biology
and Centre for Blood Research, The University of British Columbia, 2350 Health Sciences Mall, Vancouver,
BC, Canada V6T 1Z3
| | - J. Thomas Beatty
- Department
of Microbiology and Immunology and ‡Department of Biochemistry and Molecular Biology
and Centre for Blood Research, The University of British Columbia, 2350 Health Sciences Mall, Vancouver,
BC, Canada V6T 1Z3
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14
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Thamarath SS, Bode BE, Prakash S, Sai Sankar Gupta KB, Alia A, Jeschke G, Matysik J. Electron Spin Density Distribution in the Special Pair Triplet of Rhodobacter sphaeroides R26 Revealed by Magnetic Field Dependence of the Solid-State Photo-CIDNP Effect. J Am Chem Soc 2012; 134:5921-30. [DOI: 10.1021/ja2117377] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Bela E. Bode
- Leiden Institute of Chemistry, Leiden University, 2300 RA Leiden, The Netherlands
- EaStCHEM and Biomedical Sciences
Research Complex, University of St Andrews, St Andrews, KY16 9ST, Scotland
| | - Shipra Prakash
- Leiden Institute of Chemistry, Leiden University, 2300 RA Leiden, The Netherlands
| | | | - A. Alia
- Leiden Institute of Chemistry, Leiden University, 2300 RA Leiden, The Netherlands
| | - Gunnar Jeschke
- Institut für Physikalische
Chemie, Eidgenössische Technische Hochschule, Zürich, Switzerland
| | - Jörg Matysik
- Leiden Institute of Chemistry, Leiden University, 2300 RA Leiden, The Netherlands
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15
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Leonova MM, Fufina TY, Vasilieva LG, Shuvalov VA. Structure-function investigations of bacterial photosynthetic reaction centers. BIOCHEMISTRY (MOSCOW) 2012; 76:1465-83. [DOI: 10.1134/s0006297911130074] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Gibasiewicz K, Pajzderska M, Potter JA, Fyfe PK, Dobek A, Brettel K, Jones MR. Mechanism of recombination of the P+H(A)- radical pair in mutant Rhodobacter sphaeroides reaction centers with modified free energy gaps between P+B(A)- and P+H(A)-. J Phys Chem B 2011; 115:13037-50. [PMID: 21970763 DOI: 10.1021/jp206462g] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The kinetics of recombination of the P(+)H(A)(-) radical pair were compared in wild-type reaction centers from Rhodobacter sphaeroides and in seven mutants in which the free energy gap, ΔG, between the charge separated states P(+)B(A)(-) and P(+)H(A)(-) was either increased or decreased. Five of the mutant RCs had been described previously, and X-ray crystal structures of two newly constructed complexes were determined by X-ray crystallography. The charge recombination reaction was accelerated in all mutants with a smaller ΔG than in the wild-type, and was slowed in a mutant having a larger ΔG. The free energy difference between the state P(+)H(A)(-) and the PH(A) ground state was unaffected by most of these mutations. These observations were consistent with a model in which the P(+)H(A)(-) → PH(A) charge recombination is thermally activated and occurs via the intermediate state P(+)B(A)(-), with a mean rate related to the size of the ΔG between the states P(+)B(A)(-) and P(+)H(A)(-) and not the ΔG between P(+)H(A)(-) and the ground state. A more detailed analysis of charge recombination in the mutants showed that the kinetics of the reaction were multiexponential, and characterized by ~0.5, ~1-3, and 7-17 ns lifetimes, similar to those measured for wild-type reaction centers. The exact lifetimes and relative amplitudes of the three components were strongly modulated by the mutations. Two models were considered in order to explain the observed multiexponentiality and modulation, involving heterogeneity or relaxation of P(+)H(A)(-) states, with the latter model giving a better fit to the experimental results.
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17
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Mathies G, van Hemert MC, Gast P, Gupta KBSS, Frank HA, Lugtenburg J, Groenen EJJ. Configuration of Spheroidene in the Photosynthetic Reaction Center of Rhodobacter sphaeroides: A Comparison of Wild-Type and Reconstituted R26. J Phys Chem A 2011; 115:9552-6. [DOI: 10.1021/jp112413d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guinevere Mathies
- Department of Molecular Physics, Huygens Laboratory, Leiden University, The Netherlands
| | - Marc C. van Hemert
- Department of Chemistry, Gorlaeus Laboratories, Leiden University, The Netherlands
| | - Peter Gast
- Department of Molecular Physics, Huygens Laboratory, Leiden University, The Netherlands
| | | | - Harry A. Frank
- Department of Chemistry, University of Connecticut, Storrs, Connecticut, United States
| | - Johan Lugtenburg
- Department of Chemistry, Gorlaeus Laboratories, Leiden University, The Netherlands
| | - Edgar J. J. Groenen
- Department of Molecular Physics, Huygens Laboratory, Leiden University, The Netherlands
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18
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Pawlowicz NP, van Stokkum IHM, Breton J, van Grondelle R, Jones MR. An investigation of slow charge separation in a Tyrosine M210 to Tryptophan mutant of the Rhodobacter sphaeroides reaction center by femtosecond mid-infrared spectroscopy. Phys Chem Chem Phys 2010; 12:2693-705. [DOI: 10.1039/b905934b] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Mechanism of Charge Separation in Purple Bacterial Reaction Centers. THE PURPLE PHOTOTROPHIC BACTERIA 2009. [DOI: 10.1007/978-1-4020-8815-5_19] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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20
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Daviso E, Diller A, Alia A, Matysik J, Jeschke G. Photo-CIDNP MAS NMR beyond the T1 limit by fast cycles of polarization extinction and polarization generation. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2008; 190:43-51. [PMID: 17967555 DOI: 10.1016/j.jmr.2007.10.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2007] [Revised: 10/01/2007] [Accepted: 10/04/2007] [Indexed: 05/06/2023]
Abstract
In nanosecond-laser flash photo-CIDNP MAS NMR, polarization generation (PG) proceeds much faster than longitudinal spin relaxation. With a nanosecond-laser setup linked to the NMR console the repetition time of the experiment is then limited by the minimum recycle delay of the NMR spectrometer and the maximum repetition rate of laser flashes. These limits can only be reached if polarization left after the NMR experiment is completely canceled before the next laser flash. We introduce a presaturation pulse sequence, based on three (pi/2) (13)C pulses and optimized timing and phase cycling that allows for such efficient polarization extinction (PE). The technique is demonstrated on selectively isotope labeled bacterial reaction centers (RCs) of Rhodobacter (Rb.) sphaeroides wildtype (WT). High-quality (13)C photo-CIDNP MAS NMR spectra are obtained using cycle rates up to 4 Hz. The PE-PG strategy proposed here provides a general experimental scheme for reduction of measurement time in magnetic resonance experiments based on fast PG.
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Affiliation(s)
- Eugenio Daviso
- Leiden Institute of Chemistry, Einsteinweg 55, P.O. Box 9502, 2300 RA Leiden, The Netherlands
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21
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Prakash S, Alia A, Gast P, de Groot HJM, Jeschke G, Matysik J. 13C Chemical Shift Map of the Active Cofactors in Photosynthetic Reaction Centers ofRhodobacter sphaeroidesRevealed by Photo-CIDNP MAS NMR. Biochemistry 2007; 46:8953-60. [PMID: 17630781 DOI: 10.1021/bi700559b] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
13C photo-CIDNP MAS NMR studies have been performed on reaction centers (RCs) of Rhodobacter sphaeroides wild type (WT) that have been selectively labeled with an isotope using [5-13C]-delta-aminolevulinic acid.HCl in all the BChl and BPhe cofactors at positions C-4, C-5, C-9, C-10, C-14, C-15, C-16, and C-20. 13C CP/MAS NMR and 13C-13C dipolar correlation photo-CIDNP MAS NMR provide a chemical shift map of the cofactors involved in the electron transfer process in the RC at the atomic scale. The 13C-13C dipolar correlation photo-CIDNP spectra reveal three strong components, originating from two BChl cofactors, called P1 and P2 and assigned to the special pair, as well as one BPhe, PhiA. In addition, there is a weak component observed that arises from a third BChl cofactor, denoted P3, which appears to originate from the accessory BChl BA. An almost complete set of assignments of all the aromatic carbon atoms in the macrocycles of BChl and BPhe is achieved in combination with previous photo-CIDNP studies on site-directed BChl/BPhe-labeled RCs [Schulten, E. A. M., Matysik, J., Alia, Kiihne, S., Raap, J., Lugtenburg, J., Gast, P., Hoff, A. J., and de Groot, H. J. M. (2002) Biochemistry 41, 8708-8717], allowing a comprehensive map of the ground-state electronic structure of the photochemically active cofactors to be constructed for the first time. The reasons for the anomaly of P2 and the origin of the polarization on P3 are discussed.
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Affiliation(s)
- Shipra Prakash
- Leiden Institute of Chemistry, P.O. Box 9502, 2300 RA Leiden, The Netherlands
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22
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Bixon M, Jortner J. Electron Transfer-from Isolated Molecules to Biomolecules. ADVANCES IN CHEMICAL PHYSICS 2007. [DOI: 10.1002/9780470141656.ch3] [Citation(s) in RCA: 232] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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23
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Treynor TP, Yoshina-Ishii C, Boxer SG. Probing Excited-State Electron Transfer by Resonance Stark Spectroscopy: 4. Mutations near BL in Photosynthetic Reaction Centers Perturb Multiple Factors that Affect →. J Phys Chem B 2004. [DOI: 10.1021/jp048986c] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thomas P. Treynor
- Department of Chemistry, Stanford University, Stanford, California 94305-5080
| | | | - Steven G. Boxer
- Department of Chemistry, Stanford University, Stanford, California 94305-5080
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24
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Prakash S, Alia, Gast P, Jeschke G, de Groot HJ, Matysik J. Photochemically induced dynamic nuclear polarisation in entire bacterial photosynthetic units observed by 13C magic-angle spinning NMR. J Mol Struct 2003. [DOI: 10.1016/j.molstruc.2003.07.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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25
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Johnson ET, Nagarajan V, Zazubovich V, Riley K, Small GJ, Parson WW. Effects of Ionizable Residues on the Absorption Spectrum and Initial Electron-Transfer Kinetics in the Photosynthetic Reaction Center of Rhodobacter sphaeroides. Biochemistry 2003; 42:13673-83. [PMID: 14622014 DOI: 10.1021/bi035366d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Effects of ionizable amino acids on spectroscopic properties and electron-transfer kinetics in the photosynthetic reaction center (RC) of Rhodobacter sphaeroides are investigated by site-directed mutations designed to alter the electrostatic environment of the bacteriochlorophyll dimer that serves as the photochemical electron donor (P). Arginine residues at homologous positions in the L and M subunits (L135 and M164) are changed independently: Arg L135 is replaced by Lys, Leu, Glu, and Gln and Arg M164 by Leu and Glu. Asp L155 also is mutated to Asn, Tyr L164 to Phe, and Cys L247 to Lys and Asp. The mutations at L155, L164, and M164 have little effect on the absorption spectrum, whereas those at L135 and L247 shift the long-wavelength absorption band of P to higher energies. Fits to the ground-state absorption and hole-burned spectra indicate that the blue shift and increased width of the absorption band in the L135 mutants are due partly to changes in the distribution of energies for the zero-phonon absorption line and partly to stronger electron-phonon coupling. The initial electron-transfer kinetics are not changed significantly in most of the mutants, but the time constant increases from 3.0 +/- 0.2 in wild-type RCs to 4.7 +/- 0.2 in C(L247)D and 7.0 +/- 0.3 ps in C(L247)K. The effects of the mutations on the solvation free energies of the product of the initial electron-transfer reaction (P(+)) and the charge-transfer states that contribute to the absorption spectrum ( and ) were calculated by using a distance-dependent electrostatic screening factor. The results are qualitatively in accord with the view that electrostatic interactions of the bacteriochlorophylls with ionized residues of the protein are strongly screened and make only minor contributions to the energetics and dynamics of charge separation. However, the slowing of electron transfer in the Cys L247 mutants and the blue shift of the spectrum in some of the Arg L135 and Cys L247 mutants cannot be explained consistently by electrostatic interactions of the mutated residues with P and B(L); we ascribe these effects tentatively to structural changes caused by the mutations.
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Affiliation(s)
- E T Johnson
- Department of Biochemistry, Box 357350, University of Washington, Seattle, Washington 98195-7350, USA
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26
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Shuvalov VA, Yakovlev AG. Coupling of nuclear wavepacket motion and charge separation in bacterial reaction centers. FEBS Lett 2003; 540:26-34. [PMID: 12681478 DOI: 10.1016/s0014-5793(03)00237-0] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The mechanism of the charge separation and stabilization of separated charges was studied using the femtosecond absorption spectroscopy. It was found that nuclear wavepacket motions on potential energy surface of the excited state of the primary electron donor P* leads to a coherent formation of the charge separated states P(+)B(A)(-), P(+)H(A)(-) and P(+)H(B)(-) (where B(A), H(B) and H(A) are the primary and secondary electron acceptors, respectively) in native, pheophytin-modified and mutant reaction centers (RCs) of Rhodobacter sphaeroides R-26 and in Chloroflexus aurantiacus RCs. The processes were studied by measurements of coherent oscillations in kinetics at 890 and 935 nm (the stimulated emission bands of P*), at 800 nm (the absorption band of B(A)) and at 1020 nm (the absorption band of B(A)(-)) as well as at 760 nm (the absorption band of H(A)) and at 750 nm (the absorption band of H(B)). It was found that wavepacket motion on the 130-150 cm(-1) potential surface of P* is accompanied by approaches to the intercrossing region between P* and P(+)B(A)(-) surfaces at 120 and 380 fs delays emitting light at 935 nm (P*) and absorbing light at 1020 nm (P(+)B(A)(-)). In the presence of Tyr M210 (Rb. sphaeroides) or M195 (C. aurantiacus) the stabilization of P(+)B(A)(-) is observed within a few picosseconds in contrast to YM210W. At even earlier delay (approximately 40 fs) the emission at 895 nm and bleaching at 748 nm are observed in C. aurantiacus RCs showing the wavepacket approach to the intercrossing between the P* and P(+)H(B)(-) surfaces at that time. The 32 cm(-1) rotation mode of HOH was found to modulate the electron transfer rate probably due to including of this molecule in polar chain connecting P(B) and B(A) and participating in the charge separation. The mechanism of the charge separation and stabilization of separated charges is discussed in terms of the role of nuclear motions, of polar groups connecting P and acceptors and of proton of OH group of TyrM210.
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Affiliation(s)
- V A Shuvalov
- Laboratory of Photobiophysics, Belozersky Institute of Chemical and Physical Biology of Moscow State University, Moscow 119992, Russia.
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27
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Shkuropatov AY, Neerken S, Permentier HP, de Wijn R, Schmidt KA, Shuvalov VA, Aartsma TJ, Gast P, Hoff AJ. The effect of exchange of bacteriopheophytin a with plant pheophytin a on charge separation in Y(M210)W mutant reaction centers of Rhodobacter sphaeroides at low temperature. BIOCHIMICA ET BIOPHYSICA ACTA 2003; 1557:1-12. [PMID: 12615343 DOI: 10.1016/s0005-2728(02)00373-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The bacteriopheophytin a molecules at the H(A) and H(B) binding sites of reaction centers (RCs) of the Y(M210)W mutant of Rhodobacter sphaeroides were chemically exchanged with plant pheophytin a. The Y(M210)W mutation slows down the formation of H(A)(-), presumably by raising the free energy level of the P(+)B(A)(-) state above that of P* due to increasing the oxidation potential of the primary electron donor P and lowering the reduction potential of the accessory bacteriochlorophyll B(A). Exchange of the bacteriopheophytins with pheophytin a on the contrary lowers the redox potential of H(A), inhibiting its reduction. A combination of the mutation and pigment exchange was therefore expected to make the A-side of the RC incapable of electron transfer and cause the excited state P* to deactivate directly to the ground state or through the B-side, or both. Time-resolved absorption difference spectroscopy at 10 K on the RCs that were modified in this way showed a lifetime of P* lengthened to about 500 ps as compared to about 200 ps measured in the original Y(M210)W RCs. We show that the decay of P* in the pheophytin-exchanged preparations is accompanied by both return to the ground state and formation of a new charge-separated state, the absorption difference spectrum of which is characterized by bleachings at 811 and 890 nm. This latter state was formed with a time constant of ca. 1.7 ns and a yield of about 30%, and lasted a few nanoseconds. On the basis of spectroscopic observations these bands at 811 and 890 nm are tentatively attributed to the presence of the P(+)B(B)(-) state, where B(B) is the accessory bacteriochlorophyll in the "inactive" B-branch of the cofactors. The B(B) molecules in Y(M210)W RCs are suggested to be spectrally heterogeneous, absorbing in the Q(y) region at 813 or 806 nm. The results are discussed in terms of perturbation of the free energy level of the P(+)B(B)(-) state and absorption properties of the B(B) bacteriochlorophyll in the mutant RCs due to a long-range effect of the Y(M210)W mutation on the protein environment of the B(B) binding pocket.
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Affiliation(s)
- Anatoli Ya Shkuropatov
- Institute of Basic Biological Problems, Russian Academy of Sciences, Pushchino, Moscow Region 142290, Russian Federation.
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28
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Schulten EAM, Matysik J, Kiihne S, Raap J, Lugtenburg J, Gast P, Hoff AJ, de Groot HJM. (13)C MAS NMR and photo-CIDNP reveal a pronounced asymmetry in the electronic ground state of the special pair of Rhodobacter sphaeroides reaction centers. Biochemistry 2002; 41:8708-17. [PMID: 12093289 DOI: 10.1021/bi025608u] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Reaction centers of wild-type Rhodobacter sphaeroides were selectively (13)C-isotope labeled in bacteriochlorophyll and bacteriopheophytin. (13)C solid-state CP/MAS NMR and photo-CIDNP were used to provide insight into the electronic structure of the primary electron donor and acceptor on the atomic scale. The first 2-dimensional photochemically induced dynamic nuclear polarization (photo-CIDNP) (13)C-(13)C solid-state MAS NMR spectra reveal that negative charging of the two BChl rings of the primary donor is involved in ground-state tuning of the oxidation potential of these cofactors in the protein via local electrostatic interactions. In particular, the (13)C shifts show moderate differences in the electronic structure between the two BChl molecules of the special pair in the electronic ground state, which can be attributed to hydrogen bonding of one of the BChl molecules. The major fraction of the electron spin density is strongly delocalized over the two BChl molecules of the special pair and the photochemically active BPhe. A small fraction of the pi-spin density is distributed over a fourth component, which is assigned to the accessory BChl. Comparison of the photo-CIDNP data with "dark" NMR spectra obtained in ultra high field indicates a rigid special pair environment upon photoreaction and suggests that structural changes of the aromatic macrocycles of the two BChl molecules of the special pair do not significantly contribute to the reorganization energy associated with the charge-transfer process.
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Affiliation(s)
- Els A M Schulten
- Leiden Institute of Chemistry, Gorlaeus Laboratoria, P.O. Box 9502, 2300 RA Leiden, The Netherlands
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29
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Abstract
The bacterial reaction centre is undoubtedly one of the most heavily studied electron transfer proteins and, as this article has tried to describe, it has made some unique contributions to our understanding of biological electron transfer and coupled protonation reactions, and has provided fascinating information in areas that concern basic properties such as protein heterogeneity and protein dynamics. Despite intensive study, much remains to be learned about how this protein catalyses the conversion of solar energy into a form that can be used by the cell. In particular, the dynamic roles played by the protein are still poorly understood. The wide range of time-scales over which the reaction centre catalyses electron transfer, and the relative ease with which electron transfer can be triggered and monitored, will ensure that the reaction centre will continue to be used as a laboratory for testing ideas about the nature of biological electron transfer for many years to come.
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Affiliation(s)
- M E van Brederode
- Faculty of Sciences, Division of Physics and Astronomy, Department of Biophysics and Physics of Complex Systems, Free University of Amsterdam, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
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30
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van Rotterdam BJ, Westerhoff HV, Visschers RW, Bloch DA, Hellingwerf KJ, Jones MR, Crielaard W. Pumping capacity of bacterial reaction centers and backpressure regulation of energy transduction. EUROPEAN JOURNAL OF BIOCHEMISTRY 2001; 268:958-70. [PMID: 11179962 DOI: 10.1046/j.1432-1327.2001.01951.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Transduction of free-energy by Rhodobacter sphaeroides reaction-center-light-harvesting-complex-1 (RCLH1) was quantified. RCLH1 complexes were reconstituted into liposomal membranes. The capacity of the RCLH1 complex to build up a proton motive force was examined at a range of incident light intensities, and induced proton permeabilities, in the presence of artificial electron donors and acceptors. Experiments were also performed with RCLH1 complexes in which the midpoint potential of the reaction center primary donor was modified over an 85-mV range by replacement of the tyrosine residue at the M210 position of the reaction center protein by histidine, phenylalanine, leucine or tryptophan. The intrinsic driving force with which the reaction center pumped protons tended to decrease as the midpoint potential of the primary donor was increased. This observation is discussed in terms of the control of the energetics of the first steps in light-driven electron transfer on the thermodynamic efficiency of the bacterial photosynthetic process. The light intensity at which half of the maximal proton motive force was generated, increased with increasing proton permeability of the membrane. This presents the first direct evidence for so-called backpressure control exerted by the proton motive force on steady-state cyclic electron transfer through and coupled proton pumping by the bacterial reaction center.
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Affiliation(s)
- B J van Rotterdam
- E.C. Slater Institute for Biochemical and Microbiological Research, BioCentrum Amsterdam, University of Amsterdam, the Netherlands.
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31
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McAuley KE, Fyfe PK, Cogdell RJ, Isaacs NW, Jones MR. X-ray crystal structure of the YM210W mutant reaction centre from Rhodobacter sphaeroides. FEBS Lett 2000; 467:285-90. [PMID: 10675555 DOI: 10.1016/s0014-5793(00)01172-8] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The X-ray crystal structure of a reaction centre from Rhodobacter sphaeroides with a mutation of tyrosine M210 to tryptophan (YM210W) has been determined to a resolution of 2.5 A. Structural conservation is very good throughout the body of the protein, with the tryptophan side chain adopting a position in the mutant complex closely resembling that of the tyrosine in the wild-type complex. The spectroscopic properties of the YM210W reaction centre are discussed with reference to the structural data, with particular focus on evidence that the introduction of the bulkier tryptophan in place of the native tyrosine may cause a small tilt of the macrocycle of the B(L) monomeric bacteriochlorophyll.
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Affiliation(s)
- K E McAuley
- Division of Biochemistry, University of Glasgow, Glasgow, UK
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32
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Vulto SIE, de Baat MA, Louwe RJW, Permentier HP, Neef T, Miller M, van Amerongen H, Aartsma TJ. Exciton Simulations of Optical Spectra of the FMO Complex from the Green Sulfur Bacterium Chlorobium tepidum at 6 K. J Phys Chem B 1998. [DOI: 10.1021/jp982095l] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Simone I. E. Vulto
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands; Institute of Biochemistry, Odense University, Campusvej 55, DK-5230 Odense M, Denmark; and Biophysics Department, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Michiel A. de Baat
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands; Institute of Biochemistry, Odense University, Campusvej 55, DK-5230 Odense M, Denmark; and Biophysics Department, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Robert J. W. Louwe
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands; Institute of Biochemistry, Odense University, Campusvej 55, DK-5230 Odense M, Denmark; and Biophysics Department, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Hjalmar P. Permentier
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands; Institute of Biochemistry, Odense University, Campusvej 55, DK-5230 Odense M, Denmark; and Biophysics Department, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Tatjana Neef
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands; Institute of Biochemistry, Odense University, Campusvej 55, DK-5230 Odense M, Denmark; and Biophysics Department, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Mette Miller
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands; Institute of Biochemistry, Odense University, Campusvej 55, DK-5230 Odense M, Denmark; and Biophysics Department, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Herbert van Amerongen
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands; Institute of Biochemistry, Odense University, Campusvej 55, DK-5230 Odense M, Denmark; and Biophysics Department, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Thijs J. Aartsma
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands; Institute of Biochemistry, Odense University, Campusvej 55, DK-5230 Odense M, Denmark; and Biophysics Department, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
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33
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Streltsov AM, Vulto SIE, Shkuropatov AY, Hoff AJ, Aartsma TJ, Shuvalov VA. BA and BB Absorbance Perturbations Induced by Coherent Nuclear Motions in Reaction Centers from Rhodobacter sphaeroides upon 30-fs Excitation of the Primary Donor. J Phys Chem B 1998. [DOI: 10.1021/jp981514b] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A. M. Streltsov
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Laboratory of Photobiophysics, Belozersky Institute of Chemical and Physical Biology, Moscow State University, Moscow, 119899 Russia, and Institute of Soil Science and Photosynthesis, Russian Academy of Sciences, Pushino, Moscow regoin, 142292, Russia
| | - S. I. E. Vulto
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Laboratory of Photobiophysics, Belozersky Institute of Chemical and Physical Biology, Moscow State University, Moscow, 119899 Russia, and Institute of Soil Science and Photosynthesis, Russian Academy of Sciences, Pushino, Moscow regoin, 142292, Russia
| | - A. Ya. Shkuropatov
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Laboratory of Photobiophysics, Belozersky Institute of Chemical and Physical Biology, Moscow State University, Moscow, 119899 Russia, and Institute of Soil Science and Photosynthesis, Russian Academy of Sciences, Pushino, Moscow regoin, 142292, Russia
| | - A. J. Hoff
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Laboratory of Photobiophysics, Belozersky Institute of Chemical and Physical Biology, Moscow State University, Moscow, 119899 Russia, and Institute of Soil Science and Photosynthesis, Russian Academy of Sciences, Pushino, Moscow regoin, 142292, Russia
| | - T. J. Aartsma
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Laboratory of Photobiophysics, Belozersky Institute of Chemical and Physical Biology, Moscow State University, Moscow, 119899 Russia, and Institute of Soil Science and Photosynthesis, Russian Academy of Sciences, Pushino, Moscow regoin, 142292, Russia
| | - V. A. Shuvalov
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Laboratory of Photobiophysics, Belozersky Institute of Chemical and Physical Biology, Moscow State University, Moscow, 119899 Russia, and Institute of Soil Science and Photosynthesis, Russian Academy of Sciences, Pushino, Moscow regoin, 142292, Russia
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Till U, Klenina IB, Proskuryakov II, Hoff AJ, Hore PJ. Recombination Dynamics and EPR Spectra of the Primary Radical Pair in Bacterila Photosynthetic Reaction Centers with Blocked Electron Transfer to the Primary Acceptor. J Phys Chem B 1997. [DOI: 10.1021/jp970686q] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- U. Till
- Physical & Theoretical Chemistry Laboratory, Oxford University, Oxford OX1 3QZ, United Kingdom, Institute of Soil Science and Photosynthesis RAS, Pushchino 142292, Russia, and Department of Biophysics, Huygens Laboratory, Leiden University, 2300 RA Leiden, The Netherlands
| | - I. B. Klenina
- Physical & Theoretical Chemistry Laboratory, Oxford University, Oxford OX1 3QZ, United Kingdom, Institute of Soil Science and Photosynthesis RAS, Pushchino 142292, Russia, and Department of Biophysics, Huygens Laboratory, Leiden University, 2300 RA Leiden, The Netherlands
| | - I. I. Proskuryakov
- Physical & Theoretical Chemistry Laboratory, Oxford University, Oxford OX1 3QZ, United Kingdom, Institute of Soil Science and Photosynthesis RAS, Pushchino 142292, Russia, and Department of Biophysics, Huygens Laboratory, Leiden University, 2300 RA Leiden, The Netherlands
| | - A. J. Hoff
- Physical & Theoretical Chemistry Laboratory, Oxford University, Oxford OX1 3QZ, United Kingdom, Institute of Soil Science and Photosynthesis RAS, Pushchino 142292, Russia, and Department of Biophysics, Huygens Laboratory, Leiden University, 2300 RA Leiden, The Netherlands
| | - P. J. Hore
- Physical & Theoretical Chemistry Laboratory, Oxford University, Oxford OX1 3QZ, United Kingdom, Institute of Soil Science and Photosynthesis RAS, Pushchino 142292, Russia, and Department of Biophysics, Huygens Laboratory, Leiden University, 2300 RA Leiden, The Netherlands
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Schellenberg P, Louwe RJW, Shochat S, Gast P, Aartsma TJ. Accumulated Photon Echo Studies on Bacterial Photosynthetic Reaction Centers: Charge-Transfer Rate Distribution and Electron−Phonon Coupling. J Phys Chem B 1997. [DOI: 10.1021/jp9714577] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- P. Schellenberg
- Department of Biophysics, University of Leiden, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - R. J. W. Louwe
- Department of Biophysics, University of Leiden, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - S. Shochat
- Department of Biophysics, University of Leiden, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - P. Gast
- Department of Biophysics, University of Leiden, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - T. J. Aartsma
- Department of Biophysics, University of Leiden, P.O. Box 9504, 2300 RA Leiden, The Netherlands
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36
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Van Brederode ME, Jones MR, Van Mourik F, Van Stokkum IH, Van Grondelle R. A new pathway for transmembrane electron transfer in photosynthetic reaction centers of Rhodobacter sphaeroides not involving the excited special pair. Biochemistry 1997; 36:6855-61. [PMID: 9188680 DOI: 10.1021/bi9703756] [Citation(s) in RCA: 94] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
It is generally accepted that electron transfer in bacterial photosynthesis is driven by the first singlet excited state of a special pair of bacteriochlorophylls (P*). We have examined the first steps of electron transfer in a mutant of the Rhodobacter sphaeroides reaction center in which charge separation from P* is dramatically slowed down. The results provide for the first time clear evidence that excitation of the monomeric bacteriochlorophyll in the active branch of the reaction center (B(A)) drives ultrafast transmembrane electron transfer without the involvement of P*, demonstrating a new and efficient mechanism for solar energy transduction in photosynthesis. The most abundant charge-separated intermediate state probably is P+B(A)-, which is formed within 200 fs from B(A)* and decays with a lifetime of 6.5 ps into P+H(A)-. We also see evidence for the involvement of a B(A)+H(A)- state in the alternative pathway.
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Affiliation(s)
- M E Van Brederode
- Department of Physics and Astronomy, Free University of Amsterdam, The Netherlands.
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37
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Fluorescence excitation spectra of membrane-bound photosynthetic reaction centers of Rhodobacter sphaeroides in which the tyrosine M210 residue is replaced by tryptophan: evidence for a new pathway of charge separation. Chem Phys Lett 1997. [DOI: 10.1016/s0009-2614(97)00155-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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38
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Spoyalov A, Hulsebosch R, Shochat S, Gast P, Hoff A. Evidence that Ala M260 is hydrogen-bonded to the reduced primary acceptor quinone QA−. in reaction centers of Rb. sphaeroides. Chem Phys Lett 1996. [DOI: 10.1016/s0009-2614(96)01255-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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39
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An LD-ADMR study on reaction centers of the LH(L131) and LH(M160) hydrogen-bonding mutants of Rhodobacter sphaeroides. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1996. [DOI: 10.1016/0005-2728(96)00083-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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40
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Bosch M, Gast P, Franken E, Zwanenburg G, Hore P, Hoff A. Magnetic interaction between QA−. and the triplet state of the primary donor in modified reaction centers of the photosynthetic bacterium Rhodobacter sphaeroides R26. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1996. [DOI: 10.1016/0005-2728(96)00064-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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41
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Müller MG, Drews G, Holzwarth A. Primary charge separation processes in reaction centers of an antenna-free mutant of Rhodobacter capsulatus. Chem Phys Lett 1996. [DOI: 10.1016/0009-2614(96)00630-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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42
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Aartsma TJ, Amesz J. Reaction center and antenna processes in photosynthesis at low temperature. PHOTOSYNTHESIS RESEARCH 1996; 48:99-106. [PMID: 24271290 DOI: 10.1007/bf00041000] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/1995] [Accepted: 01/29/1996] [Indexed: 06/02/2023]
Abstract
Around 1960 experiments of Arnold and Clayton, Chance and Nishimura and Calvin and coworkers demonstrated that the primary photosynthetic electron transfer processes are not abolished by cooling to cryogenic temperatures. After a brief historical introduction, this review discusses some aspects of electron transfer in bacterial reaction centers and of optical spectroscopy of photosynthetic systems with emphasis on low-temperature experiments.
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Affiliation(s)
- T J Aartsma
- Department of Biophysics, Huygens Laboratory, University of Leiden, P.O. Box 9504, 2300 RA, Leiden, The Netherlands
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Beekman LMP, van Stokkum IHM, Monshouwer R, Rijnders AJ, McGlynn P, Visschers RW, Jones MR, van Grondelle R. Primary Electron Transfer in Membrane-Bound Reaction Centers with Mutations at the M210 Position. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp953054h] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- L. M. P. Beekman
- Department of Physics and Astronomy and Department of Plant Physiology, Vrije Universiteit, De Boelelaan 1081, 1081 HV, Amsterdam, The Netherlands, and Krebs Institute for Biomolecular Research and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2UH, United Kingdom
| | - I. H. M. van Stokkum
- Department of Physics and Astronomy and Department of Plant Physiology, Vrije Universiteit, De Boelelaan 1081, 1081 HV, Amsterdam, The Netherlands, and Krebs Institute for Biomolecular Research and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2UH, United Kingdom
| | - R. Monshouwer
- Department of Physics and Astronomy and Department of Plant Physiology, Vrije Universiteit, De Boelelaan 1081, 1081 HV, Amsterdam, The Netherlands, and Krebs Institute for Biomolecular Research and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2UH, United Kingdom
| | - A. J. Rijnders
- Department of Physics and Astronomy and Department of Plant Physiology, Vrije Universiteit, De Boelelaan 1081, 1081 HV, Amsterdam, The Netherlands, and Krebs Institute for Biomolecular Research and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2UH, United Kingdom
| | - P. McGlynn
- Department of Physics and Astronomy and Department of Plant Physiology, Vrije Universiteit, De Boelelaan 1081, 1081 HV, Amsterdam, The Netherlands, and Krebs Institute for Biomolecular Research and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2UH, United Kingdom
| | - R. W. Visschers
- Department of Physics and Astronomy and Department of Plant Physiology, Vrije Universiteit, De Boelelaan 1081, 1081 HV, Amsterdam, The Netherlands, and Krebs Institute for Biomolecular Research and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2UH, United Kingdom
| | - M. R. Jones
- Department of Physics and Astronomy and Department of Plant Physiology, Vrije Universiteit, De Boelelaan 1081, 1081 HV, Amsterdam, The Netherlands, and Krebs Institute for Biomolecular Research and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2UH, United Kingdom
| | - R. van Grondelle
- Department of Physics and Astronomy and Department of Plant Physiology, Vrije Universiteit, De Boelelaan 1081, 1081 HV, Amsterdam, The Netherlands, and Krebs Institute for Biomolecular Research and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2UH, United Kingdom
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Vos MH, Jones MR, Breton J, Lambry JC, Martin JL. Vibrational dephasing of long- and short-lived primary donor excited states in mutant reaction centers of Rhodobacter sphaeroides. Biochemistry 1996; 35:2687-92. [PMID: 8611574 DOI: 10.1021/bi9521708] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Femtosecond spectroscopy was used to study vibrational dynamics in the first singlet excited state (P*) of the primary donor of bacterial reaction centers (RC)in which primary electron transfer dynamics have been altered by single amino acid modifications. We studied intracytoplasmic RC-only membranes containing Rhodobacter sphaeroides wild-type RCs and RCs bearing mutations in the vicinity of P, where Tyr M210 was modified to His, Leu, and Trp and where Phe L181 was modified to Tyr. These mutations do not change the frequencies of the main low-frequency activated modes, which is consistent with a description in which these modes involve extended regions of the protein. Electron transfer in FL181Y, YM210H, and wild-type RCs at 10 K occurs in approximately 1 ps or less, and damping of the coherences occurs simultaneously with the decay of the P* excited state. These results, and a comparison with YM210L RCs, show that in wild-type RCs the damping is primarily determined by the depletion of P* and not by vibrational dephasing induced by interactions with the bath or nonharmonic coupling. In the YM210L and W mutants, electron transfer occurs on a time scale of hundreds of picoseconds at 10 K. Analysis of the longer-lasting vibrational dynamics in these mutants sets a new lower limit for the intrinsic vibrational dephasing time of 1.2 ps for some modes, but of approximately 2 ps for most activated modes.
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Affiliation(s)
- M H Vos
- Laboratoire dOptique Appliquée, INSERM, Palaiseau, France
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Roobol-Bóza M, Shochat S, Tjus SE, Hagman A, Gast P, Andersson B. Perfusion chromatography-a new procedure for very rapid isolation of integral photosynthetic membrane proteins. PHOTOSYNTHESIS RESEARCH 1995; 46:339-345. [PMID: 24301601 DOI: 10.1007/bf00020449] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/1995] [Accepted: 06/08/1995] [Indexed: 06/02/2023]
Abstract
The biochemical isolation of pure and active proteins or chlorophyll protein complexes has been crucial for elucidating the mechanism of photosynthetic energy conversion. Most of the proteins involved in this process are embedded in the photosynthetic membrane. The isolation of such hydrophobic integral membrane proteins is not trivial, and involves the use of detergents often combined with various time-consuming isolation procedures. We have applied the new procedure of perfusion chromatography for the rapid isolation of photosynthetic membrane proteins. Perfusion chromatography combines a highly reactive surface per bed volume with extremely high elution flow rates. We present an overview of this chromatographic method and show the rapid isolation of reaction centres from plant Photosystems I and II and photosynthetic purple bacteria, as well as the fractionation of the chlorophyll a/b-binding proteins of Photosystem I (LHC I). The isolation times have been drastically reduced compared to earlier approaches. The pronounced reduction in time for separation of photosynthetic complexes is convenient and permits purification of proteins in a more native state, including the maintainance of ligands and the possibility to isolate proteins trapped in intermediate metabolic or structural states.
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Affiliation(s)
- M Roobol-Bóza
- Department of Biochemistry, Arrhenius Laboratories for Natural Sciences, Stockholm University, S-106 91, Stockholm, Sweden
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48
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van der Vos R, Franken EM, Sexton SJ, Shochat S, Gast P, Hore P, Hoff AJ. Optically detected magnetic field effects on reaction centers of Rhodobacter sphaeroides 2.4.1 and its Tyr M210 → Trp mutant. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1995. [DOI: 10.1016/0005-2728(95)00039-l] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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49
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Magnetic field effects on chemical reaction yields arising from avoided level-crossings in molecular triplet states. Chem Phys Lett 1995. [DOI: 10.1016/0009-2614(95)00289-g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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50
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Malkin S, Churio MS, Shochat S, Braslavsky SE. Photochemical energy storage and volume changes in the microsecond time range in bacterial photosynthesis — a laser induced optoacoustic study. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 1994. [DOI: 10.1016/1011-1344(93)06977-b] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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