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Tangar A, Derrien V, Lei R, Santiago Estevez MJ, Sebban P, Bernad S, Miksovska J. Utility of fluorescent heme analogue ZnPPIX to monitor conformational heterogeneity in vertebrate hexa-coordinated globins. Metallomics 2019; 11:906-913. [PMID: 30734813 DOI: 10.1039/c8mt00332g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Here, we report the preparation and photo-physical characterization of hexa-coordinated vertebrate globins, human neuroglobin (hNgb) and cytoglobin (hCygb), with the native iron protoporphyrin IX (FePPIX) cofactor replaced by a fluorescent isostructural analogue, zinc protoporphyrin IX (ZnPPIX). To facilitate insertion of ZnPPIX into hexa-coordinated globins, apoproteins prepared via butanone extraction were unfolded by the addition of GuHCl and subsequently slowly refolded in the presence of ZnPPIX. The absorption/emission spectra of ZnPPIX reconstituted hCygb are similar to those observed for ZnPPIX reconstituted myoglobin whereas the absorption and emission spectra of ZnPPIX reconstituted hNgb are blue shifted by ∼2 nm. Different steady state absorption and emission properties of ZnPPIX incorporated in hCygb and hNgb are consistent with distinct hydrogen bonding interactions between ZnPPIX and the globin matrix. The fluorescence lifetime of ZnPPIX in hexa-coordinated globins is bimodal pointing towards increased heterogeneity of the heme binding cavity in hCygb and hNgb. ZnPPIX reconstituted Ngb binds to cytochrome c with the same affinity as reported for the native protein, suggesting that fluorescent analogues of Cygb and Ngb can be readily employed to monitor interactions between vertebrate hexa-coordinated globins and other proteins.
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Affiliation(s)
- Antonija Tangar
- Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, USA.
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Skandary S, Konrad A, Hussels M, Meixner AJ, Brecht M. Orientations between Red Antenna States of Photosystem I Monomers from Thermosynechococcus elongatus Revealed by Single-Molecule Spectroscopy. J Phys Chem B 2015. [DOI: 10.1021/acs.jpcb.5b04483] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sepideh Skandary
- IPTC
and Lisa+ Center, University of Tübingen, D-72076 Tübingen, Germany
| | - Alexander Konrad
- IPTC
and Lisa+ Center, University of Tübingen, D-72076 Tübingen, Germany
| | - Martin Hussels
- IPTC
and Lisa+ Center, University of Tübingen, D-72076 Tübingen, Germany
| | - Alfred J. Meixner
- IPTC
and Lisa+ Center, University of Tübingen, D-72076 Tübingen, Germany
| | - Marc Brecht
- IPTC
and Lisa+ Center, University of Tübingen, D-72076 Tübingen, Germany
- Zurich University of Applied Science (ZHAW), CH-8401 Winterthur, Switzerland
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3
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Skandary S, Hussels M, Konrad A, Renger T, Müh F, Bommer M, Zouni A, Meixner A, Brecht M. Variation of exciton-vibrational coupling in photosystem II core complexes from Thermosynechococcus elongatus as revealed by single-molecule spectroscopy. J Phys Chem B 2015; 119:4203-10. [PMID: 25708355 PMCID: PMC4368080 DOI: 10.1021/jp510631x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Revised: 02/20/2015] [Indexed: 01/01/2023]
Abstract
The spectral properties and dynamics of the fluorescence emission of photosystem II core complexes are investigated by single-molecule spectroscopy at 1.6 K. The emission spectra are dominated by sharp zero-phonon lines (ZPLs). The sharp ZPLs are the result of weak to intermediate exciton-vibrational coupling and slow spectral diffusion. For several data sets, it is possible to surpass the effect of spectral diffusion by applying a shifting algorithm. The increased signal-to-noise ratio enables us to determine the exciton-vibrational coupling strength (Huang-Rhys factor) with high precision. The Huang-Rhys factors vary between 0.03 and 0.8. The values of the Huang-Rhys factors show no obvious correlation between coupling strength and wavelength position. From this result, we conclude that electrostatic rather than exchange or dispersive interactions are the main contributors to the exciton-vibrational coupling in this system.
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Affiliation(s)
| | - Martin Hussels
- IPTC
and Lisa+ Center, Universität Tübingen, Tübingen, Germany
| | | | - Thomas Renger
- Institut
für Theoretische Physik, Johannes
Kepler Universität, Linz, Austria
| | - Frank Müh
- Institut
für Theoretische Physik, Johannes
Kepler Universität, Linz, Austria
| | - Martin Bommer
- Institut
für Biologie, Humboldt Universität
zu Berlin, Berlin, Germany
| | - Athina Zouni
- Institut
für Biologie, Humboldt Universität
zu Berlin, Berlin, Germany
| | | | - Marc Brecht
- IPTC
and Lisa+ Center, Universität Tübingen, Tübingen, Germany
- Zurich University
of Applied Science Winterthur (ZHAW), Winterthur, Switzerland
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4
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Lepeshkevich SV, Parkhats MV, Stasheuski AS, Britikov VV, Jarnikova ES, Usanov SA, Dzhagarov BM. Photosensitized Singlet Oxygen Luminescence from the Protein Matrix of Zn-Substituted Myoglobin. J Phys Chem A 2014; 118:1864-78. [DOI: 10.1021/jp501615h] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sergei V. Lepeshkevich
- B.I.
Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimosti Ave, Minsk 220072, Belarus
| | - Marina V. Parkhats
- B.I.
Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimosti Ave, Minsk 220072, Belarus
| | - Alexander S. Stasheuski
- B.I.
Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimosti Ave, Minsk 220072, Belarus
| | - Vladimir V. Britikov
- Institute
of Bioorganic Chemistry, National Academy of Sciences of Belarus, 5 Academician V.F. Kuprevich Street, Minsk 220141, Belarus
| | - Ekaterina S. Jarnikova
- B.I.
Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimosti Ave, Minsk 220072, Belarus
| | - Sergey A. Usanov
- Institute
of Bioorganic Chemistry, National Academy of Sciences of Belarus, 5 Academician V.F. Kuprevich Street, Minsk 220141, Belarus
| | - Boris M. Dzhagarov
- B.I.
Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimosti Ave, Minsk 220072, Belarus
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Effect of TMAO and betaine on the energy landscape of photosystem I. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2014; 1837:849-56. [PMID: 24440559 DOI: 10.1016/j.bbabio.2014.01.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Revised: 11/30/2013] [Accepted: 01/07/2014] [Indexed: 10/25/2022]
Abstract
The accumulation of organic co-solvents in cells is a basic strategy for organisms from various species to increase stress tolerance in extreme environments. Widespread representatives of this class of co-solvents are trimethylamine-N-oxide (TMAO) and betaine; these small molecules are able to stabilize the native conformation of proteins and prevent their aggregation. Despite their importance, detailed experimental studies on the impact of these co-solvents on the energy landscape of proteins have not yet been carried out. We use single-molecule spectroscopy at cryogenic temperatures to examine the influence of these physiological relevant co-solvents on photosystem I (PSI) from Thermosynechococcus elongatus. In contrast to PSI ensemble spectra, which are almost unaffected by the addition of TMAO and betaine, statistical analysis of the fluorescence emission from individual PSI trimers yields insight into the interaction of the co-solvents with PSI. The results show an increased homogeneity upon addition of TMAO or betaine. The number of detectable zero-phonon lines (ZPLs) is reduced, indicating spectral diffusion processes with faster rates. In the framework of energy landscape model these findings indicate that co-solvents lead to reduced barrier heights between energy valleys, and thus efficient screening of protein conformations can take place.
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Hussels M, Brecht M. Effect of Glycerol and PVA on the Conformation of Photosystem I. Biochemistry 2011; 50:3628-37. [DOI: 10.1021/bi2000615] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Martin Hussels
- Universität Tübingen, IPTC, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Marc Brecht
- Universität Tübingen, IPTC, Auf der Morgenstelle 18, 72076 Tübingen, Germany
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Abstract
Protein dynamics is crucial for protein function. Proteins in living systems are not isolated, but operate in networks and in a carefully regulated environment. Understanding the external control of protein dynamics is consequently important. Hydration and solvent viscosity are among the salient properties of the environment. Dehydrated proteins and proteins in a rigid environment do not function properly. It is consequently important to understand the effect of hydration and solvent viscosity in detail. We discuss experiments that separate the two effects. These experiments have predominantly been performed with wild-type horse and sperm whale myoglobin, using the binding of carbon monoxide over a broad range of temperatures as a tool. The experiments demonstrate that data taken only in the physiological temperature range are not sufficient to understand the effect of hydration and solvent on protein relaxation and function. While the actual data come from myoglobin, it is expected that the results apply to most or all globular proteins.
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Affiliation(s)
- Hans Frauenfelder
- Center for Non-linear Studies, MS B258, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
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Dantsker D, Samuni U, Friedman AJ, Yang M, Ray A, Friedman JM. Geminate rebinding in trehalose-glass embedded myoglobins reveals residue-specific control of intramolecular trajectories. J Mol Biol 2002; 315:239-51. [PMID: 11779242 DOI: 10.1006/jmbi.2001.5218] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
It is becoming increasingly apparent that hydrophobic cavities (also referred to as xenon cavities) within proteins have significant functional implications. The potential functional role of these cavities in modulating the internal dynamics of carbon monoxide in myoglobin (Mb) is explored in the present study by using glassy matrices derived from trehalose to limit protein dynamics and to eliminate ligand exchange between the solvent and the protein. By varying the temperature (-15 to 65 degrees C) and humidity for samples of carbonmonoxy myoglobin embedded in trehalose-glass, it is possible to observe a hierarchy of distinct geminate recombination phases that extend from nanosecond to almost seconds that can be directly associated with rebinding from specific hydrophobic cavities. The use of mutant forms of Mb reveals the role of key residues in modulating ligand access between these cavities and the distal hemepocket.
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Affiliation(s)
- David Dantsker
- Department of Physiology and Biophysics, Albert Einstein College of Medicine, Bronx 10461, USA
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