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Pamu R, Khomami B, Mukherjee D. Observation of anomalous carotenoid and blind chlorophyll activations in photosystem I under synthetic membrane confinements. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2022; 1864:183930. [PMID: 35398026 DOI: 10.1016/j.bbamem.2022.183930] [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: 08/02/2021] [Revised: 03/27/2022] [Accepted: 04/01/2022] [Indexed: 06/14/2023]
Abstract
The role of natural thylakoid membrane confinements in architecting the robust structural and electrochemical properties of PSI is not fully understood. Most PSI studies till date extract the proteins from their natural confinements that can lead to non-native conformations. Recently our group had successfully reconstituted PSI in synthetic lipid membranes using detergent-mediated liposome solubilizations. In this study, we investigate the alterations in chlorophylls and carotenoids interactions and reorganization in PSI based on spectral property changes induced by its confinement in anionic DPhPG and zwitterionic DPhPC phospholipid membranes. To this end, we employ a combination of absorption, fluorescence, and circular dichroism (CD) spectroscopic measurements. Our results indicate unique activation and alteration of photoresponses from the PSI carotenoid (Car) bands in PSI-DPhPG proteoliposomes that can tune the Excitation Energy Transfer (EET), otherwise absent in PSI at non-native environments. Specifically, we observe broadband light harvesting via enhanced absorption in the otherwise non-absorptive green region (500-580 nm) of the Chlorophylls (Chl) along with ~64% increase in the full-width half maximum of the Qy band (650-720 nm). The CD results indicate enhanced Chl-Chl and Chl-Car interactions along with conformational changes in protein secondary structures. Such distinct changes in the Car and Chl bands are not observed in PSI confined in DPhPC. The fundamental insights into membrane microenvironments tailoring PSI subunits reorganization and interactions provide novel strategies for tuning photoexcitation processes and rational designing of biotic-abiotic interfaces in PSI-based photoelectrochemical energy conversion systems.
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Affiliation(s)
- Ravi Pamu
- Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, TN 37996, USA; Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3), University of Tennessee, Knoxville, TN 37996, USA; Sustainable Energy Education and Research Center (SEERC), University of Tennessee, Knoxville, TN 37996, USA
| | - Bamin Khomami
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA; Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, TN 37996, USA; Sustainable Energy Education and Research Center (SEERC), University of Tennessee, Knoxville, TN 37996, USA.
| | - Dibyendu Mukherjee
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA; Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3), University of Tennessee, Knoxville, TN 37996, USA; Sustainable Energy Education and Research Center (SEERC), University of Tennessee, Knoxville, TN 37996, USA.
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2
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Yu D, Lan J, Khan NU, Li Q, Xu F, Huang G, Xu H, Huang F. The in vitro synergistic denaturation effect of heat and surfactant on photosystem I isolated from Arthrospira Platensis. PHOTOSYNTHESIS RESEARCH 2019; 141:229-243. [PMID: 30725234 DOI: 10.1007/s11120-019-00623-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 01/26/2019] [Indexed: 06/09/2023]
Abstract
Photosystem I (PSI) generates the most negative redox potential found in nature, and the performance of solar energy conversion into alternative energy sources in artificial systems highly depends on the thermal stability of PSI. Thus, understanding thermal denaturation is an important prerequisite for the use of PSI at elevated temperatures. To assess the thermal stability of surfactant-solubilized PSI from cyanobacteria Arthrospira Platensis, the synergistic denaturation effect of heat and surfactant was studied. At room temperature, surfactant n-dodecyl-β-D-maltoside solubilized PSI trimer gradually disassembles into PSI monomers and free pigments over long time. In the solubilizing process of PSI particles, surfactant can uncouple pigments of PSI, and the high concentration of surfactant causes the pigment to uncouple more; after the surfactant-solubilizing process, the uncoupling is relatively slow. During the heating process, changes were monitored by transmittance T800nm, ellipticity θ686nm and θ222nm, upon slow heating (1.5 °C per minute) of samples in Tris buffer (20 mM, pH 7.8) from 20 to 95 °C. The thermal denaturation of surfactant-solubilized PSI is a much more complicated process, which includes the uncoupling of pigments by surfactants, the disappearance of surrounding surfactants, and the unfolding of PSI α-helices. During the heating process, the uncoupling chlorophyll a (Chla) and converted pheophytin (Pheo) can form excitons of Chla-Pheo. The secondary structure α-helix of PSI proteins is stable up to 87-92 °C in the low-concentration surfactant solubilized PSI, and high-concentration surfactant and pigments uncoupling can accelerate the α-helical unfolding.
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Affiliation(s)
- Daoyong Yu
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao, 266580, Shandong, China.
- Center for Bioengineering and Biotechnology, College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, Shandong, China.
| | - Jinxiao Lan
- Center for Bioengineering and Biotechnology, College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, Shandong, China
| | - Naseer Ullah Khan
- Center for Bioengineering and Biotechnology, College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, Shandong, China
| | - Quan Li
- Center for Bioengineering and Biotechnology, College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, Shandong, China
| | - Fengxi Xu
- Center for Bioengineering and Biotechnology, College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, Shandong, China
| | - Guihong Huang
- Center for Bioengineering and Biotechnology, College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, Shandong, China
| | - Hai Xu
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao, 266580, Shandong, China.
- Center for Bioengineering and Biotechnology, College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, Shandong, China.
| | - Fang Huang
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao, 266580, Shandong, China.
- Center for Bioengineering and Biotechnology, College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, Shandong, China.
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3
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Kölsch A, Hejazi M, Stieger KR, Feifel SC, Kern JF, Müh F, Lisdat F, Lokstein H, Zouni A. Insights into the binding behavior of native and non-native cytochromes to photosystem I from Thermosynechococcus elongatus. J Biol Chem 2018; 293:9090-9100. [PMID: 29695502 DOI: 10.1074/jbc.ra117.000953] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 04/18/2018] [Indexed: 01/09/2023] Open
Abstract
The binding of photosystem I (PS I) from Thermosynechococcus elongatus to the native cytochrome (cyt) c6 and cyt c from horse heart (cyt cHH) was analyzed by oxygen consumption measurements, isothermal titration calorimetry (ITC), and rigid body docking combined with electrostatic computations of binding energies. Although PS I has a higher affinity for cyt cHH than for cyt c6, the influence of ionic strength and pH on binding is different in the two cases. ITC and theoretical computations revealed the existence of unspecific binding sites for cyt cHH besides one specific binding site close to P700 Binding to PS I was found to be the same for reduced and oxidized cyt cHH Based on this information, suitable conditions for cocrystallization of cyt cHH with PS I were found, resulting in crystals with a PS I:cyt cHH ratio of 1:1. A crystal structure at 3.4-Å resolution was obtained, but cyt cHH cannot be identified in the electron density map because of unspecific binding sites and/or high flexibility at the specific binding site. Modeling the binding of cyt c6 to PS I revealed a specific binding site where the distance and orientation of cyt c6 relative to P700 are comparable with cyt c2 from purple bacteria relative to P870 This work provides new insights into the binding modes of different cytochromes to PS I, thus facilitating steps toward solving the PS I-cyt c costructure and a more detailed understanding of natural electron transport processes.
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Affiliation(s)
- Adrian Kölsch
- From the Biophysics of Photosynthesis, Institute for Biology, Humboldt-Universität zu Berlin, Philippstrasse 13, 10115 Berlin, Germany,
| | - Mahdi Hejazi
- From the Biophysics of Photosynthesis, Institute for Biology, Humboldt-Universität zu Berlin, Philippstrasse 13, 10115 Berlin, Germany
| | - Kai R Stieger
- Biosystems Technology, Institute for Applied Life Sciences, University of Applied Sciences Wildau, Hochschulring 1, 15745 Wildau, Germany
| | - Sven C Feifel
- Biosystems Technology, Institute for Applied Life Sciences, University of Applied Sciences Wildau, Hochschulring 1, 15745 Wildau, Germany
| | - Jan F Kern
- Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Frank Müh
- Department of Theoretical Biophysics, Institute for Theoretical Physics, Johannes Kepler University Linz, Altenberger Strasse 69, 4040 Linz, Austria, and
| | - Fred Lisdat
- Biosystems Technology, Institute for Applied Life Sciences, University of Applied Sciences Wildau, Hochschulring 1, 15745 Wildau, Germany
| | - Heiko Lokstein
- Department of Chemical Physics and Optics, Charles University, Ke Karlovu 3, CZ-121 16 Praha 2, Czech Republic
| | - Athina Zouni
- From the Biophysics of Photosynthesis, Institute for Biology, Humboldt-Universität zu Berlin, Philippstrasse 13, 10115 Berlin, Germany,
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Pamu R, Sandireddy VP, Kalyanaraman R, Khomami B, Mukherjee D. Plasmon-Enhanced Photocurrent from Photosystem I Assembled on Ag Nanopyramids. J Phys Chem Lett 2018; 9:970-977. [PMID: 29405719 DOI: 10.1021/acs.jpclett.7b03255] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Plasmonic metal nanostructures have been known to tune optoelectronic properties of fluorophores. Here, we report the first-ever experimental observation of plasmon-induced photocurrent enhancements from Photosystem I (PSI) immobilized on Fischer patterns of silver nanopyramids (Ag-NP). To this end, the plasmonic peaks of Ag-NP were tuned to match the PSI absorption peaks at ∼450 and ∼680 nm wavelengths. Specifically, the plasmon-enhanced photocurrents indicate enhancement factors of ∼6.5 and ∼5.8 as compared to PSI assembly on planar Ag substrates for nominal excitation wavelengths of 660 and 470 nm, respectively. The comparable enhancement factors from both 470 and 660 nm excitations, in spite of a significantly weaker plasmon absorption peak at ∼450 nm for the Ag-NP structures, can be rationalized by previously reported excessive plasmon-induced fluorescence emission losses from PSI in the red region as compared to the blue region of the excitation wavelengths.
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Affiliation(s)
- Ravi Pamu
- Department of Mechanical, Aerospace, and Biomedical Engineering; ‡Department of Chemical and Biomolecular Engineering; §Department of Material Science and Engineering; ∥Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3); ⊥Sustainable Energy Education and Research Center (SEERC), University of Tennessee , Knoxville, Tennessee 37996, United States
| | - V Prasad Sandireddy
- Department of Mechanical, Aerospace, and Biomedical Engineering; ‡Department of Chemical and Biomolecular Engineering; §Department of Material Science and Engineering; ∥Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3); ⊥Sustainable Energy Education and Research Center (SEERC), University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Ramki Kalyanaraman
- Department of Mechanical, Aerospace, and Biomedical Engineering; ‡Department of Chemical and Biomolecular Engineering; §Department of Material Science and Engineering; ∥Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3); ⊥Sustainable Energy Education and Research Center (SEERC), University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Bamin Khomami
- Department of Mechanical, Aerospace, and Biomedical Engineering; ‡Department of Chemical and Biomolecular Engineering; §Department of Material Science and Engineering; ∥Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3); ⊥Sustainable Energy Education and Research Center (SEERC), University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Dibyendu Mukherjee
- Department of Mechanical, Aerospace, and Biomedical Engineering; ‡Department of Chemical and Biomolecular Engineering; §Department of Material Science and Engineering; ∥Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3); ⊥Sustainable Energy Education and Research Center (SEERC), University of Tennessee , Knoxville, Tennessee 37996, United States
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5
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Niroomand H, Mukherjee D, Khomami B. Tuning the photoexcitation response of cyanobacterial Photosystem I via reconstitution into Proteoliposomes. Sci Rep 2017; 7:2492. [PMID: 28559589 PMCID: PMC5449388 DOI: 10.1038/s41598-017-02746-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 04/19/2017] [Indexed: 12/25/2022] Open
Abstract
The role of natural thylakoid membrane housing of Photosystem I (PSI), the transmembrane photosynthetic protein, in its robust photoactivated charge separation with near unity quantum efficiency is not fundamentally understood. To this end, incorporation of suitable protein scaffolds for PSI incorporation is of great scientific and device manufacturing interest. Areas of interest include solid state bioelectronics, and photoelectrochemical devices that require bio-abio interfaces that do not compromise the photoactivity and photostability of PSI. Therefore, the surfactant-induced membrane solubilization of a negatively charged phospholipid (DPhPG) with the motivation of creating biomimetic reconstructs of PSI reconstitution in DPhPG liposomes is studied. Specifically, a simple yet elegant method for incorporation of PSI trimeric complexes into DPhPG bilayer membranes that mimic the natural thylakoid membrane housing of PSI is introduced. The efficacy of this method is demonstrated via absorption and fluorescence spectroscopy measurements as well as direct visualization using atomic force microscopy. This study provides direct evidence that PSI confinements in synthetic lipid scaffolds can be used for tuning the photoexcitation characteristics of PSI. Hence, it paves the way for development of fundamental understanding of microenvironment alterations on photochemical response of light activated membrane proteins.
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Affiliation(s)
- Hanieh Niroomand
- Sustainable Energy Education and Research Center (SEERC), Knoxville, USA.,Department of Chemical and Biomolecular Engineering, Knoxville, USA
| | - Dibyendu Mukherjee
- Sustainable Energy Education and Research Center (SEERC), Knoxville, USA. .,Department of Chemical and Biomolecular Engineering, Knoxville, USA. .,Department of Mechanical, Aerospace and Biomedical Engineering, University of Tennessee, Knoxville, USA.
| | - Bamin Khomami
- Sustainable Energy Education and Research Center (SEERC), Knoxville, USA. .,Department of Chemical and Biomolecular Engineering, Knoxville, USA. .,Department of Mechanical, Aerospace and Biomedical Engineering, University of Tennessee, Knoxville, USA.
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6
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Ruiz-Hitzky E, Darder M, Alcântara ACS, Wicklein B, Aranda P. Functional Nanocomposites Based on Fibrous Clays. FUNCTIONAL POLYMER COMPOSITES WITH NANOCLAYS 2016. [DOI: 10.1039/9781782626725-00001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
This chapter is focused on functional nanocomposites based on the use of the microfibrous clays sepiolite and palygorskite as efficient fillers for diverse types of polymer matrices, from typical thermoplastics to biopolymers. The main features that govern the interaction between the silicates and the polymer matrix are discussed. The introduction addresses the structural and textural features of the fibrous silicates, as well as the possible synthetic approaches to increase the compatibility of these nanofillers with the polymeric matrix. Additionally, these clays can be easily functionalized through their surface silanol groups based on chemical reactions or by anchoring of nanoparticles. This allows for the preparation of a wide variety of functional polymer–clay nanocomposites. Thereafter, some relevant examples of nanocomposites derived from conventional polymers are reported, as well as of those based on polymers that exhibit electrical conductivity. Lastly, selected works employing sepiolite or palygorskite as fillers in polymeric matrixes of natural origin are discussed, showing the wide application of these resulting nanocomposites as bioplastics, as well as in biomedicine, environmental remediation and the development of sensor devices.
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Affiliation(s)
- Eduardo Ruiz-Hitzky
- Instituto de Ciencia de Materiales de Madrid CSIC, c/ Sor Juana Inés de la Cruz 3 28049 Madrid Spain
| | - Margarita Darder
- Instituto de Ciencia de Materiales de Madrid CSIC, c/ Sor Juana Inés de la Cruz 3 28049 Madrid Spain
| | - Ana C. S. Alcântara
- Universidade Federal do Maranhão (UFMA), Departamento de Química (DEQUI) São Luís-MA Brazil
| | - Bernd Wicklein
- Instituto de Ciencia de Materiales de Madrid CSIC, c/ Sor Juana Inés de la Cruz 3 28049 Madrid Spain
| | - Pilar Aranda
- Instituto de Ciencia de Materiales de Madrid CSIC, c/ Sor Juana Inés de la Cruz 3 28049 Madrid Spain
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7
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Niroomand H, Venkatesan GA, Sarles SA, Mukherjee D, Khomami B. Lipid-Detergent Phase Transitions During Detergent-Mediated Liposome Solubilization. J Membr Biol 2016; 249:523-38. [DOI: 10.1007/s00232-016-9894-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 03/24/2016] [Indexed: 11/24/2022]
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Harris BJ, Cheng X, Frymier P. Structure and Function of Photosystem I–[FeFe] Hydrogenase Protein Fusions: An All-Atom Molecular Dynamics Study. J Phys Chem B 2016; 120:599-609. [DOI: 10.1021/acs.jpcb.5b07812] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bradley J. Harris
- College
of Engineering and Computer Science, University of Tennessee, Chattanooga, Tennessee 37403, United States
| | - Xiaolin Cheng
- Center for
Molecular Biophysics, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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Bennett T, Niroomand H, Pamu R, Ivanov I, Mukherjee D, Khomami B. Elucidating the role of methyl viologen as a scavenger of photoactivated electrons from photosystem I under aerobic and anaerobic conditions. Phys Chem Chem Phys 2016; 18:8512-21. [DOI: 10.1039/c6cp00049e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present electrochemical investigations into the role of dissolved O2 in electrolyte solutions in scavenging photoactivated electrons from photosystem I (PS I) while using methyl viologen (MV2+) as the redox mediator.
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Affiliation(s)
- Tyler Bennett
- Materials Research and Innovation Laboratory (MRAIL)
- Department of Chemical and Biomolecular Engineering
- University of Tennessee
- Knoxville
- USA
| | - Hanieh Niroomand
- Materials Research and Innovation Laboratory (MRAIL)
- Department of Chemical and Biomolecular Engineering
- University of Tennessee
- Knoxville
- USA
| | - Ravi Pamu
- Department of Mechanical
- Aerospace and Biomedical Engineering
- University of Tennessee
- Knoxville
- USA
| | - Ilia Ivanov
- Center for Nanophase Materials Sciences (CNMS)
- Oak Ridge National Laboratory (ORNL)
- Oak Ridge
- USA
| | - Dibyendu Mukherjee
- Materials Research and Innovation Laboratory (MRAIL)
- Department of Chemical and Biomolecular Engineering
- University of Tennessee
- Knoxville
- USA
| | - Bamin Khomami
- Materials Research and Innovation Laboratory (MRAIL)
- Department of Chemical and Biomolecular Engineering
- University of Tennessee
- Knoxville
- USA
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Le RK, Raeeszadeh-Sarmazdeh M, Boder ET, Frymier PD. Sortase-mediated ligation of PsaE-modified photosystem I from Synechocystis sp. PCC 6803 to a conductive surface for enhanced photocurrent production on a gold electrode. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:1180-1188. [PMID: 25535846 DOI: 10.1021/la5031284] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Sortase-mediated ligation was used to attach the photosystem I (PSI) complex from Synechocystis sp. PCC 6803 in a preferential orientation to enhance photoinduced electron flow to a conductive gold surface. Ideally, this method can result in a uniform monolayer of protein, covalently bound unidirectionally to the electrode surface. The exposed C-termini of the psaE subunits of the PSI trimer were targeted to contain an LPETG-sortase recognition sequence to increase noncompeting electron transfer by uniformly orienting the PSI stromal side proximal to the surface. Surface characterization with atomic force microscopy suggested that monolayer formation and optimal surface coverage occurred when the gold surfaces were incubated with peptide at 100 to 500 μM concentrations. When photochronoamperometry with potassium ferrocyanide and ferricyanide as redox mediators was used, photocurrents in the range of 100 to 200 nA/cm(2) were produced, which is an improvement over other attachment techniques for photosystem monolayers that produce approximately 100 nA/cm(2) or less. This work demonstrated that sortase-mediated ligation aided in the control of PSI orientation on modified gold surfaces with a distribution of 94% stromal side proximal and 6% lumenal side proximal to the surface for current-producing PSI.
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Affiliation(s)
- Rosemary K Le
- Department of Chemical and Biomolecular Engineering, ‡Institute for Biomedical Engineering, and §Bredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee-Knoxville , Knoxville, Tennessee 37966-2200, United States
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11
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Yu D, Huang G, Xu F, Ge B, Liu S, Xu H, Huang F. Effect of surfactants on apparent oxygen consumption of photosystem I isolated from Arthrospira platensis. PHOTOSYNTHESIS RESEARCH 2014; 122:203-213. [PMID: 24947956 DOI: 10.1007/s11120-014-0022-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Accepted: 05/29/2014] [Indexed: 06/03/2023]
Abstract
Surfactants play a significant role in solubilization of photosystem I (PSI) in vitro. Triton X-100 (TX), n-Dodecyl-β-D-maltoside (DDM), and sodium dodecyl sulfate (SDS) were employed to solubilize PSI particles in MES buffer to compare the effect of surfactant and its dosage on the apparent oxygen consumption rate of PSI. Through a combined assessment of sucrose density gradient centrifugation, Native PAGE and 77 K fluorescence with the apparent oxygen consumption, the nature of the enhancement of the apparent oxygen consumption activity of PSI by surfactants has been analyzed. Aggregated PSI particles can be dispersed by surfactant molecules into micelles, and the apparent oxygen consumption rate is higher for surfactant-solubilized PSI than for integral PSI particles. For DDM, PSI particles are solubilized mostly as the integral trimeric form. For TX, PSI particles are solubilized as incomplete trimeric and some monomeric forms. For the much harsher surfactant, SDS, PSI particles are completely solubilized as monomeric and its subunit forms. The enhancement of the oxygen consumption rate cannot be explained only by the effects of surfactant on the equilibrium between monomeric and trimeric forms of solubililized PSI. Care must be taken when the electron transfer activity of PSI is evaluated by methods based on oxygen consumption because the apparent oxygen consumption rate is influenced by uncoupled chlorophyll (Chl) from PSI, i.e., the larger the amount of uncoupled Chl, the higher the rate of apparent oxygen consumption. 77 K fluorescence spectra can be used to ensure that there is no uncoupled Chl present in the system. In order to eliminate the effect of trace uncoupled Chl, an efficient physical quencher of (1)O2, such as 1 mM NaN3, may be added into the mixture.
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Affiliation(s)
- Daoyong Yu
- State Key Laboratory of Heavy Oil Processing, Center for Bioengineering and Biotechnology, China University of Petroleum (East China), Qingdao, 266580, Shandong, China,
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12
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Harris BJ, Cheng X, Frymier P. All-atom molecular dynamics simulation of a photosystem i/detergent complex. J Phys Chem B 2014; 118:11633-45. [PMID: 25233289 DOI: 10.1021/jp507157e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
All-atom molecular dynamics (MD) simulation was used to investigate the solution structure and dynamics of the photosynthetic pigment-protein complex photosystem I (PSI) from Thermosynechococcus elongatus embedded in a toroidal belt of n-dodecyl-β-d-maltoside (DDM) detergent. Evaluation of root-mean-square deviations (RMSDs) relative to the known crystal structure show that the protein complex surrounded by DDM molecules is stable during the 200 ns simulation time, and root-mean-square fluctuation (RMSF) analysis indicates that regions of high local mobility correspond to solvent-exposed regions such as turns in the transmembrane α-helices and flexible loops on the stromal and lumenal faces. Comparing the protein-detergent complex to a pure detergent micelle, the detergent surrounding the PSI trimer is found to be less densely packed but with more ordered detergent tails, contrary to what is seen in most lipid bilayer models. We also investigated any functional implications for the observed conformational dynamics and protein-detergent interactions, discovering interesting structural changes in the psaL subunits associated with maintaining the trimeric structure of the protein. Importantly, we find that the docking of soluble electron mediators such as cytochrome c6 and ferredoxin to PSI is not significantly impacted by the solubilization of PSI in detergent.
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Affiliation(s)
- Bradley J Harris
- Department of Chemical and Biomolecular Engineering, ‡Department of Biochemistry and Cellular and Molecular Biology, §Sustainable Energy Education and Research Center, and ∥Bredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee , Knoxville, Tennessee 37996, United States
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13
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Le RK, Harris BJ, Iwuchukwu IJ, Bruce BD, Cheng X, Qian S, Heller WT, O’Neill H, Frymier PD. Analysis of the solution structure of Thermosynechococcus elongatus photosystem I in n-dodecyl-β-d-maltoside using small-angle neutron scattering and molecular dynamics simulation. Arch Biochem Biophys 2014; 550-551:50-7. [DOI: 10.1016/j.abb.2014.04.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Accepted: 04/15/2014] [Indexed: 10/25/2022]
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14
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Zaitsev SY, Solovyeva DO, Nabiev IR. Nanobiohybrid structures based on the organized films of photosensitive membrane proteins. RUSSIAN CHEMICAL REVIEWS 2014. [DOI: 10.1070/rc2014v083n01abeh004372] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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15
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Ruiz-Hitzky E, Darder M, Alcântara ACS, Wicklein B, Aranda P. Recent Advances on Fibrous Clay-Based Nanocomposites. ORGANIC-INORGANIC HYBRID NANOMATERIALS 2014. [DOI: 10.1007/12_2014_283] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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16
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17
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Manocchi AK, Baker DR, Pendley SS, Nguyen K, Hurley MM, Bruce BD, Sumner JJ, Lundgren CA. Photocurrent generation from surface assembled photosystem I on alkanethiol modified electrodes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:2412-9. [PMID: 23379304 DOI: 10.1021/la304477u] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Photosystem I (PSI) is a key component of oxygenic photosynthetic electron transport because of its light-induced electron transfer to the soluble electron acceptor ferredoxin. This work demonstrates the incorporation of surface assembled cyanobacterial trimeric PSI complexes into a biohybrid system for light-driven current generation. Specifically, this work demonstrates the improved assembly of PSI via electrophoretic deposition, with controllable surface assembled PSI density, on different self-assembled alkanethiol monolayers. Using artificial electron donors and acceptors (Os(bpy)(2)Cl(2) and methyl viologen) we demonstrate photocurrent generation from a single PSI layer, which remains photoactive for at least three hours of intermittent illumination. Photoelectrochemical comparison of the biohybrid systems assembled from different alkanethiols (hexanethiol, aminohexanethiol, mercaptohexanol, and mercaptohexanoic acid) reveals that the PSI generated photocurrent is enhanced by almost 5 times on negatively charged SAM surfaces as compared to positively charged surfaces. These results are discussed in light of how PSI is oriented upon electrodeposition on a SAM.
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Affiliation(s)
- Amy K Manocchi
- Sensors and Electron Devices Directorate, United States Army Research Laboratory, Adelphi, Maryland 20783, United States
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A friendly detergent for H2 oxidation by Aquifex aeolicus membrane-bound hydrogenase immobilized on graphite and Self-Assembled-Monolayer-modified gold electrodes. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2012.03.034] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Mukherjee D, Vaughn M, Khomami B, Bruce BD. Modulation of cyanobacterial photosystem I deposition properties on alkanethiolate Au substrate by various experimental conditions. Colloids Surf B Biointerfaces 2011; 88:181-90. [DOI: 10.1016/j.colsurfb.2011.06.029] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2011] [Revised: 06/22/2011] [Accepted: 06/22/2011] [Indexed: 10/18/2022]
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