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Battagliarin G, Davies M, Mackowiak S, Li C, Müllen K. Ortho-functionalized perylenediimides for highly fluorescent water-soluble dyes. Chemphyschem 2012; 13:923-6. [PMID: 22241589 DOI: 10.1002/cphc.201100833] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2011] [Revised: 12/08/2011] [Indexed: 11/06/2022]
Abstract
Clearly visible: A water-soluble and highly fluorescent perylenediimide is synthesized via ruthenium-catalyzed alkylation with outstanding yields. For the first time, the possibility to use phosphonate derivatives in a Murai-type reaction is demonstrated.
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Affiliation(s)
- Glauco Battagliarin
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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52
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Bairi P, Roy B, Nandi AK. Bi-component hydrogel of perylene-3,4,9,10-tetracarboxylic potassium salt andl-tyrosine. RSC Adv 2012. [DOI: 10.1039/c1ra00506e] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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53
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El-Khouly ME, Gutiérrez AM, Sastre-Santos Á, Fernández-Lázaro F, Fukuzumi S. Light harvesting zinc naphthalocyanine–perylenediimide supramolecular dyads: long-lived charge-separated states in nonpolar media. Phys Chem Chem Phys 2012; 14:3612-21. [DOI: 10.1039/c2cp23285e] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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54
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Yang XC, Chai MY, Zhu Y, Yang WT, Xu FJ. A highly fluorescent cationic bifunctional conjugate. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm16166d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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55
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Blas-Ferrando VM, Ortiz J, Bouissane L, Ohkubo K, Fukuzumi S, Fernández-Lázaro F, Sastre-Santos Á. Rational design of a phthalocyanine–perylenediimide dyad with a long-lived charge-separated state. Chem Commun (Camb) 2012; 48:6241-3. [DOI: 10.1039/c2cc31087b] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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56
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Liu H, Wang Y, Liu C, Li H, Gao B, Zhang L, Bo F, Bai Q, Ba X. Fluorescent water-soluble probes based on dendritic PEG substituted perylene bisimides: synthesis, photophysical properties, and live cell images. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm30168g] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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57
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Matsumoto S, Mori T, Akazome M. Synthesis and fluorescence properties of N-methyl-1,2-dihyroquinoline-3-carboxylate derivatives: light-emitting compounds in organic solvent, in neat form, and in water. RSC Adv 2012. [DOI: 10.1039/c2ra20061a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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58
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Roy S, Kumar Maiti D, Panigrahi S, Basak D, Banerjee A. A new hydrogel from an amino acid-based perylene bisimide and its semiconducting, photo-switching behaviour. RSC Adv 2012. [DOI: 10.1039/c2ra21319b] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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59
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Perylene bisimide as a versatile fluorescent tool for environmental and biological analysis: A review. Talanta 2011; 85:1233-7. [DOI: 10.1016/j.talanta.2011.06.010] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2011] [Revised: 06/06/2011] [Accepted: 06/07/2011] [Indexed: 11/19/2022]
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60
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Yang SK, Shi X, Park S, Doganay S, Ha T, Zimmerman SC. Monovalent, clickable, uncharged, water-soluble perylenediimide-cored dendrimers for target-specific fluorescent biolabeling. J Am Chem Soc 2011; 133:9964-7. [PMID: 21671621 DOI: 10.1021/ja2009136] [Citation(s) in RCA: 120] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein we report the synthesis of water-soluble polyglycerol-dendronized perylenediimides with a single reactive group that undergoes high-yielding click reactions. Single-molecule studies and target-specific biolabeling are reported, including the highly specific labeling of proteins on the surface of living bacterial and mammalian cells.
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Affiliation(s)
- Si Kyung Yang
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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61
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Börsch M, Wrachtrup J. Improving FRET‐Based Monitoring of Single Chemomechanical Rotary Motors at Work. Chemphyschem 2011; 12:542-53. [DOI: 10.1002/cphc.201000702] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2010] [Revised: 12/12/2010] [Indexed: 11/07/2022]
Affiliation(s)
- Michael Börsch
- 3rd Institute of Physics and Stuttgart Research Center SCOPE, University of Stuttgart, Pfaffenwaldring 57, Fax: (+49) 711‐685‐65281
| | - Jörg Wrachtrup
- 3rd Institute of Physics and Stuttgart Research Center SCOPE, University of Stuttgart, Pfaffenwaldring 57, Fax: (+49) 711‐685‐65281
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62
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Single-molecule fluorescence resonance energy transfer techniques on rotary ATP synthases. Biol Chem 2011; 392:135-42. [DOI: 10.1515/bc.2011.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Conformational changes of proteins can be monitored in real time by fluorescence resonance energy transfer (FRET). Two different fluorophores have to be attached to those protein domains which move during function. Distance fluctuations between the fluorophores are measured by relative fluorescence intensity changes or fluorescence lifetime changes. The rotary mechanics of the two motors of FoF1-ATP synthase have been studied in vitro by single-molecule FRET. The results are summarized and perspectives for other transport ATPases are discussed.
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63
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Wang L, Xu L, Neoh KG, Kang ET. Water-soluble highly fluorescent poly[poly(ethylene glycol) methyl ether methacrylate] for cell labeling. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm04052e] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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64
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Labeling of Oligohistidine-Tagged Proteins. ADVANCED FLUORESCENCE REPORTERS IN CHEMISTRY AND BIOLOGY III 2011. [DOI: 10.1007/978-3-642-18035-4_9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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65
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Céspedes-Guirao FJ, B. Ropero A, Font-Sanchis E, Nadal Á, Fernández-Lázaro F, Sastre-Santos Á. A water-soluble perylene dye functionalised with a 17β-estradiol: a new fluorescent tool for steroid hormones. Chem Commun (Camb) 2011; 47:8307-9. [DOI: 10.1039/c1cc10966a] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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66
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Weil T, Vosch T, Hofkens J, Peneva K, Müllen K. Rylenfarbstoffe als maßgeschneiderte Nanoemitter für die Photonik. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200902532] [Citation(s) in RCA: 130] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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67
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Weil T, Vosch T, Hofkens J, Peneva K, Müllen K. The Rylene Colorant Family-Tailored Nanoemitters for Photonics Research and Applications. Angew Chem Int Ed Engl 2010; 49:9068-93. [DOI: 10.1002/anie.200902532] [Citation(s) in RCA: 520] [Impact Index Per Article: 37.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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68
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Lentijo S, Miguel JA, Espinet P. Highly Fluorescent Platinum(II) Organometallic Complexes of Perylene and Perylene Monoimide, with Pt σ-Bonded Directly to the Perylene Core. Inorg Chem 2010; 49:9169-77. [DOI: 10.1021/ic1003319] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sergio Lentijo
- IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47071 Valladolid, Spain
| | - Jesús A. Miguel
- IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47071 Valladolid, Spain
| | - Pablo Espinet
- IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47071 Valladolid, Spain
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69
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Wang J, Kulago A, Browne WR, Feringa BL. Photoswitchable intramolecular H-stacking of perylenebisimide. J Am Chem Soc 2010; 132:4191-6. [PMID: 20210315 DOI: 10.1021/ja910829b] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Dynamic control over the formation of H- or J-type aggregates of chromophores is of fundamental importance for developing responsive organic optoelectronic materials. In this study, the first example of photoswitching between a nonstacked and an intramolecularly H-stacked arrangement of perylenebisimides (PBI) is demonstrated. The system is composed of a central switching unit (overcrowded alkene) tethered to two PBI chromophores. cis-trans isomerization of the switching unit, induced by alternate irradiation at 312 and 365 nm, can drive two PBI chromophores reversibly between an intramolecularly "aggregated" and "nonaggregated" state. Distinct changes in UV-vis absorption and fluorescence spectra are observed following photoisomerization. This approach allows for efficient control of intramolecular H-stack formation with no significant intermolecular interactions spanning over at least 4 orders of magnitude of concentration (from 10(-8) to 10(-4) M) and a range of solvents and temperatures.
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Affiliation(s)
- Jiaobing Wang
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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70
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Chang WH, Liu Y. Bio-Orthogonal Protein Labeling Methods for Single Molecule FRET. J CHIN CHEM SOC-TAIP 2010. [DOI: 10.1002/jccs.201000073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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71
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Cordes T, Vogelsang J, Anaya M, Spagnuolo C, Gietl A, Summerer W, Herrmann A, Müllen K, Tinnefeld P. Single-molecule redox blinking of perylene diimide derivatives in water. J Am Chem Soc 2010; 132:2404-9. [PMID: 20121094 DOI: 10.1021/ja9099714] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Dynamic developments in ultrasensitive and superresolution fluorescence microscopy call for improved fluorescence markers with increased photostability and new functionalities. We used single-molecule spectroscopy to study water-soluble perylene dicarboximide fluorophores (PDI), which were immobilized in aqueous buffer by attaching the fluorophore to DNA. Under these conditions bright fluorescence, comparable to that of single-molecule compatible organic fluorophores, is observed with homogeneous spectral and fluorescence decay time distributions. We additionally show how the fluorescence of the PDI can be controlled through photoinduced electron-transfer reactions by using different concentrations of reductants and oxidants, yielding either blinking or stable emission. We explain these properties by the redox potentials of PDI and the recently introduced ROXS (reducing and oxidizing system) concept. Finally, we evaluate how this fluorescence control of PDIs can be used for superresolution "Blink-Microscopy" in aqueous or organic media and more generally for single-molecule spectroscopy.
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Affiliation(s)
- Thorben Cordes
- Angewandte Physik-Biophysik, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München, Germany
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72
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Rehm S, Stepanenko V, Zhang X, Rehm T, Würthner F. Spermine-Functionalized Perylene Bisimide Dyes-Highly Fluorescent Bola-Amphiphiles in Water. Chemistry 2010; 16:3372-82. [DOI: 10.1002/chem.200902839] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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73
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Avlasevich Y, Li C, Müllen K. Synthesis and applications of core-enlarged perylene dyes. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c000137f] [Citation(s) in RCA: 179] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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74
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Peneva K, Gundlach K, Herrmann A, Paulsen H, Müllen K. Site-specific incorporation of perylene into an N-terminally modified light-harvesting complex II. Org Biomol Chem 2010; 8:4823-6. [DOI: 10.1039/c0ob00492h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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75
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Zambianchi M, Di Maria F, Cazzato A, Gigli G, Piacenza M, Della Sala F, Barbarella G. Microwave-assisted synthesis of thiophene fluorophores, labeling and multilabeling of monoclonal antibodies, and long lasting staining of fixed cells. J Am Chem Soc 2009; 131:10892-900. [PMID: 19618930 DOI: 10.1021/ja902416s] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report the expedient microwave-assisted synthesis of thiophene based 4-sulfo-2,3,5,6,-tetrafluorophenyl esters whose molecular structure was engineered to achieve blue to red bright fluorescence. The reactivity toward monoclonal antibodies of the newly synthesized fluorophores was analyzed in comparison with that of the corresponding N-succinimidyl esters. Single-fluorophore and multiple-fluorophore labeled antibodies were easily prepared with both types of esters. Multiple-fluorophore labeling with blue and orange emitting fluorophores resulted in white fluorescent antibodies. Thiophene based fluorophores displayed unprecedented fluorescence stability in immunostaining experiments. First-principles TD-DFT theoretical calculations helped us to interpret the behavior of fluorescence emission in different environments.
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Affiliation(s)
- Massimo Zambianchi
- Consiglio Nazionale Ricerche CNR-ISOF, Via Gobetti 101, 40129 Bologna, Italy
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76
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Fessenden JD. Förster resonance energy transfer measurements of ryanodine receptor type 1 structure using a novel site-specific labeling method. PLoS One 2009; 4:e7338. [PMID: 19823671 PMCID: PMC2757896 DOI: 10.1371/journal.pone.0007338] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2009] [Accepted: 09/14/2009] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND While the static structure of the intracellular Ca(2+) release channel, the ryanodine receptor type 1 (RyR1) has been determined using cryo electron microscopy, relatively little is known concerning changes in RyR1 structure that accompany channel gating. Förster resonance energy transfer (FRET) methods can resolve small changes in protein structure although FRET measurements of RyR1 are hampered by an inability to site-specifically label the protein with fluorescent probes. METHODOLOGY/PRINCIPAL FINDINGS A novel site-specific labeling method is presented that targets a FRET acceptor, Cy3NTA to 10-residue histidine (His) tags engineered into RyR1. Cy3NTA, comprised of the fluorescent dye Cy3, coupled to two Ni(2+)/nitrilotriacetic acid moieties, was synthesized and functionally tested for binding to His-tagged green fluorescent protein (GFP). GFP fluorescence emission and Cy3NTA absorbance spectra overlapped significantly, indicating that FRET could occur (Förster distance = 6.3 nm). Cy3NTA bound to His(10)-tagged GFP, quenching its fluorescence by 88%. GFP was then fused to the N-terminus of RyR1 and His(10) tags were placed either at the N-terminus of the fused GFP or between GFP and RyR1. Cy3NTA reduced fluorescence of these fusion proteins by 75% and this quenching could be reversed by photobleaching Cy3, thus confirming GFP-RyR1 quenching via FRET. A His(10) tag was then placed at amino acid position 1861 and FRET was measured from GFP located at either the N-terminus or at position 618 to Cy3NTA bound to this His tag. While minimal FRET was detected between GFP at position 1 and Cy3NTA at position 1861, 53% energy transfer was detected from GFP at position 618 to Cy3NTA at position 1861, thus indicating that these sites are in close proximity to each other. CONCLUSIONS/SIGNIFICANCE These findings illustrate the potential of this site-specific labeling system for use in future FRET-based experiments to elucidate novel aspects of RyR1 structure.
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Affiliation(s)
- James D Fessenden
- Boston Biomedical Research Institute, Watertown, Massachusetts, United States of America.
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77
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Alemdaroglu FE, Alexander SC, Ji D, Prusty DK, Börsch M, Herrmann A. Poly(BODIPY)s: A New Class of Tunable Polymeric Dyes. Macromolecules 2009. [DOI: 10.1021/ma900727k] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fikri E. Alemdaroglu
- Zernike Institute for Advanced Materials, Department of Polymer Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Seth C. Alexander
- Zernike Institute for Advanced Materials, Department of Polymer Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Dongmei Ji
- Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
| | - Deepak K. Prusty
- Zernike Institute for Advanced Materials, Department of Polymer Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Michael Börsch
- Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
| | - Andreas Herrmann
- Zernike Institute for Advanced Materials, Department of Polymer Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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78
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Roullier V, Clarke S, You C, Pinaud F, Gouzer GG, Schaible D, Marchi-Artzner V, Piehler J, Dahan M. High-affinity labeling and tracking of individual histidine-tagged proteins in live cells using Ni2+ tris-nitrilotriacetic acid quantum dot conjugates. NANO LETTERS 2009; 9:1228-1234. [PMID: 19216518 DOI: 10.1021/nl9001298] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Investigation of many cellular processes using fluorescent quantum dots (QDs) is hindered by the nontrivial requirements for QD surface functionalization and targeting. To address these challenges, we designed, characterized and applied QD-trisNTA, which integrates tris-nitrilotriacetic acid, a small and high-affinity recognition unit for the ubiquitous polyhistidine protein tag. Using QD-trisNTA, we demonstrate two-color QD tracking of the type-1 interferon receptor subunits in live cells, potentially enabling direct visualization of protein-protein interactions at the single molecule level.
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Affiliation(s)
- Victor Roullier
- Université de Rennes, Sciences Chimiques de Rennes, CNRS UMR 6226, Campus de Beaulieu, 35042 Rennes Cedex, France
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79
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Donati F, Pucci A, Ruggeri G. Temperature and chemical environment effects on the aggregation extent of water soluble perylene dye into vinyl alcohol-containing polymers. Phys Chem Chem Phys 2009; 11:6276-82. [DOI: 10.1039/b903120k] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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80
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Matsumoto S, Samata D, Akazome M, Ogura K. Synthesis and physical properties of various organic dyes derived from a single core skeleton, 1,2-dihydroindol-3-one. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2008.10.098] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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81
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Li C, Schöneboom J, Liu Z, Pschirer N, Erk P, Herrmann A, Müllen K. Rainbow Perylene Monoimides: Easy Control of Optical Properties. Chemistry 2008; 15:878-84. [DOI: 10.1002/chem.200802126] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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82
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Düser MG, Bi Y, Zarrabi N, Dunn SD, Börsch M. The proton-translocating a subunit of F0F1-ATP synthase is allocated asymmetrically to the peripheral stalk. J Biol Chem 2008; 283:33602-10. [PMID: 18786919 DOI: 10.1074/jbc.m805170200] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The position of the a subunit of the membrane-integral F0 sector of Escherichia coli ATP synthase was investigated by single molecule fluorescence resonance energy transfer studies utilizing a fusion of enhanced green fluorescent protein to the C terminus of the a subunit and fluorescent labels attached to specific positions of the epsilon or gamma subunits. Three fluorescence resonance energy transfer levels were observed during rotation driven by ATP hydrolysis corresponding to the three resting positions of the rotor subunits, gamma or epsilon, relative to the a subunit of the stator. Comparison of these positions of the rotor sites with those previously determined relative to the b subunit dimer indicates the position of a as adjacent to the b dimer on its counterclockwise side when the enzyme is viewed from the cytoplasm. This relationship provides stability to the membrane interface between a and b2, allowing it to withstand the torque imparted by the rotor during ATP synthesis as well as ATP hydrolysis.
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Affiliation(s)
- Monika G Düser
- 3, Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart, Germany
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