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Lyratzakis A, Meier-Credo J, Langer JD, Tsiotis G. Insights into the sulfur metabolism of Chlorobaculum tepidum by label-free quantitative proteomics. Proteomics 2023; 23:e2200138. [PMID: 36790022 DOI: 10.1002/pmic.202200138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 01/20/2023] [Accepted: 02/06/2023] [Indexed: 02/16/2023]
Abstract
Chlorobaculum tepidum is an anaerobic green sulfur bacterium which oxidizes sulfide, elemental sulfur, and thiosulfate for photosynthetic growth. It can also oxidize sulfide to produce extracellular S0 globules, which can be further oxidized to sulfate and used as an electron donor. Here, we performed label-free quantitative proteomics on total cell lysates prepared from different metabolic states, including a sulfur production state (10 h post-incubation [PI]), the beginning of sulfur consumption (20 h PI), and the end of sulfur consumption (40 h PI), respectively. We observed an increased abundance of the sulfide:quinone oxidoreductase (Sqr) proteins in 10 h PI indicating a sulfur production state. The periplasmic thiosulfate-oxidizing Sox enzymes and the dissimilatory sulfite reductase (Dsr) subunits showed an increased abundance in 20 h PI, corresponding to the sulfur-consuming state. In addition, we found that the abundance of the heterodisulfide-reductase and the sulfhydrogenase operons was influenced by electron donor availability and may be associated with sulfur metabolism. Further, we isolated and analyzed the extracellular sulfur globules in the different metabolic states to study their morphology and the sulfur cluster composition, yielding 58 previously uncharacterized proteins in purified globules. Our results show that C. tepidum regulates the cellular levels of enzymes involved in sulfur metabolism in response to the availability of reduced sulfur compounds.
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Affiliation(s)
| | - Jakob Meier-Credo
- Proteomics, Max Planck Institute of Biophysics, Frankfurt am Main, Germany
| | - Julian D Langer
- Proteomics, Max Planck Institute of Biophysics, Frankfurt am Main, Germany
- Proteomics, Max Planck Institute for Brain Research, Frankfurt am Main, Germany
| | - Georgios Tsiotis
- Department of Chemistry, University of Crete, Voutes Campus, Heraklion, Greece
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Orf GS, Collins AM, Niedzwiedzki DM, Tank M, Thiel V, Kell A, Bryant DA, Montaño GA, Blankenship RE. Polymer-Chlorosome Nanocomposites Consisting of Non-Native Combinations of Self-Assembling Bacteriochlorophylls. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:6427-6438. [PMID: 28585832 DOI: 10.1021/acs.langmuir.7b01761] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Chlorosomes are one of the characteristic light-harvesting antennas from green sulfur bacteria. These complexes represent a unique paradigm: self-assembly of bacteriochlorophyll pigments within a lipid monolayer without the influence of protein. Because of their large size and reduced complexity, they have been targeted as models for the development of bioinspired light-harvesting arrays. We report the production of biohybrid light-harvesting nanocomposites mimicking chlorosomes, composed of amphiphilic diblock copolymer membrane bodies that incorporate thousands of natural self-assembling bacteriochlorophyll molecules derived from green sulfur bacteria. The driving force behind the assembly of these polymer-chlorosome nanocomposites is the transfer of the mixed raw materials from the organic to the aqueous phase. We incorporated up to five different self-assembling pigment types into single nanocomposites that mimic chlorosome morphology. We establish that the copolymer-BChl self-assembly process works smoothly even when non-native combinations of BChl homologues are included. Spectroscopic characterization revealed that the different types of self-assembling pigments participate in ultrafast energy transfer, expanding beyond single chromophore constraints of the natural chlorosome system. This study further demonstrates the utility of flexible short-chain, diblock copolymers for building scalable, tunable light-harvesting arrays for technological use and allows for an in vitro analysis of the flexibility of natural self-assembling chromophores in unique and controlled combinations.
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Affiliation(s)
| | - Aaron M Collins
- Center for Integrated Nanotechnologies, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | | | - Marcus Tank
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
- Department of Biological Sciences, Tokyo Metropolitan University , Tokyo, Japan 192-0397
| | - Vera Thiel
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
- Department of Biological Sciences, Tokyo Metropolitan University , Tokyo, Japan 192-0397
| | - Adam Kell
- Department of Chemistry, Kansas State University , Manhattan, Kansas 66506, United States
| | - Donald A Bryant
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
- Department of Chemistry and Biochemistry, Montana State University , Bozeman, Montana 59717, United States
| | - Gabriel A Montaño
- Center for Integrated Nanotechnologies, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
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Ng KK, Takada M, Harmatys K, Chen J, Zheng G. Chlorosome-Inspired Synthesis of Templated Metallochlorin-Lipid Nanoassemblies for Biomedical Applications. ACS NANO 2016; 10:4092-4101. [PMID: 27015124 DOI: 10.1021/acsnano.5b07151] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Chlorosomes are vesicular light-harvesting organelles found in photosynthetic green sulfur bacteria. These organisms thrive in low photon flux environments due to the most efficient light-to-chemical energy conversion, promoted by a protein-less assembly of chlorin pigments. These assemblies possess collective absorption properties and can be adapted for contrast-enhanced bioimaging applications, where maximized light absorption in the near-infrared optical window is desired. Here, we report a strategy for tuning light absorption toward the near-infrared region by engineering a chlorosome-inspired assembly of synthetic metallochlorins in a biocompatible lipid scaffold. In a series of synthesized chlorin analogues, we discovered that lipid conjugation, central coordination of a zinc metal into the chlorin ring, and a 3(1)-methoxy substitution were critical for the formation of dye assemblies in lipid nanovesicles. The substitutions result in a specific optical shift, characterized by a bathochromically shifted (72 nm) Qy absorption band, along with an increase in absorbance and circular dichroism as the ratio of dye-conjugated lipid was increased. These alterations in optical spectra are indicative of the formation of delocalized excitons states across each molecular assembly. This strategy of tuning absorption by mimicking the structures found in photosynthetic organisms may spur new opportunities in the development of biophotonic contrast agents for medical applications.
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Affiliation(s)
- Kenneth K Ng
- Institute of Biomaterials and Biomedical Engineering and Department of Medical Biophysics, University of Toronto , Toronto, Ontario M5G 1L7, Canada
- Princess Margaret Cancer Centre, University Health Network , Toronto, Ontario M5G 1L7, Canada
| | - Misa Takada
- Princess Margaret Cancer Centre, University Health Network , Toronto, Ontario M5G 1L7, Canada
- Department of Chemistry, Osaka University , Osaka 560-0043, Japan
| | - Kara Harmatys
- Princess Margaret Cancer Centre, University Health Network , Toronto, Ontario M5G 1L7, Canada
| | - Juan Chen
- Princess Margaret Cancer Centre, University Health Network , Toronto, Ontario M5G 1L7, Canada
| | - Gang Zheng
- Institute of Biomaterials and Biomedical Engineering and Department of Medical Biophysics, University of Toronto , Toronto, Ontario M5G 1L7, Canada
- Princess Margaret Cancer Centre, University Health Network , Toronto, Ontario M5G 1L7, Canada
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Strong coupling between chlorosomes of photosynthetic bacteria and a confined optical cavity mode. Nat Commun 2014; 5:5561. [PMID: 25429787 DOI: 10.1038/ncomms6561] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Accepted: 10/14/2014] [Indexed: 01/13/2023] Open
Abstract
Strong exciton-photon coupling is the result of a reversible exchange of energy between an excited state and a confined optical field. This results in the formation of polariton states that have energies different from the exciton and photon. We demonstrate strong exciton-photon coupling between light-harvesting complexes and a confined optical mode within a metallic optical microcavity. The energetic anti-crossing between the exciton and photon dispersions characteristic of strong coupling is observed in reflectivity and transmission with a Rabi splitting energy on the order of 150 meV, which corresponds to about 1,000 chlorosomes coherently coupled to the cavity mode. We believe that the strong coupling regime presents an opportunity to modify the energy transfer pathways within photosynthetic organisms without modification of the molecular structure.
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Kudryashev M, Aktoudianaki A, Dedoglou D, Stahlberg H, Tsiotis G. The ultrastructure of Chlorobaculum tepidum revealed by cryo-electron tomography. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2014; 1837:1635-42. [DOI: 10.1016/j.bbabio.2014.06.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 06/04/2014] [Accepted: 06/10/2014] [Indexed: 11/28/2022]
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Kovács SÁ, Bricker WP, Niedzwiedzki DM, Colletti PF, Lo CS. Computational determination of the pigment binding motif in the chlorosome protein a of green sulfur bacteria. PHOTOSYNTHESIS RESEARCH 2013; 118:231-247. [PMID: 24078352 DOI: 10.1007/s11120-013-9920-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2012] [Accepted: 08/31/2013] [Indexed: 06/02/2023]
Abstract
We present a molecular-scale model of Bacteriochlorophyll a (BChl a) binding to the chlorosome protein A (CsmA) of Chlorobaculum tepidum, and the aggregated pigment–protein dimer, as determined from protein–ligand docking and quantum chemistry calculations. Our calculations provide strong evidence that the BChl a molecule is coordinated to the His25 residue of CsmA, with the magnesium center of the bacteriochlorin ring situated\3 A° from the imidazole nitrogen atom of the histidine sidechain, and the phytyl tail aligned along the nonpolar residues of the a-helix of CsmA. We also confirm that the Qy band in the absorption spectra of BChl a experiences a large (?16 to ?43 nm) redshift when aggregated with another BChl a molecule in the CsmA dimer, compared to the BChl a in solvent; this redshift has been previously established by experimental researchers. We propose that our model of the BChl a–CsmA binding motif, where the dimer contains parallel aligned N-terminal regions, serves as the smallest repeating unit in a larger model of the para-crystalline chlorosome baseplate protein.
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dos Santos Z, Pereira M, Fonseca J. Rheology and dynamic light scattering of octa-ethyleneglycol-monododecylether/chitosan solutions. Carbohydr Polym 2013; 98:321-30. [DOI: 10.1016/j.carbpol.2013.05.092] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Revised: 05/28/2013] [Accepted: 05/31/2013] [Indexed: 10/26/2022]
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