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Tsvirko M. Intensity of Cooperative Vibronic Transitions in the Eu (III), Gd (III) and Tb (III) Formates Spectra. LUMINESCENCE 2022; 37:1387-1394. [PMID: 35708212 DOI: 10.1002/bio.4311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 04/29/2022] [Accepted: 06/12/2022] [Indexed: 11/09/2022]
Affiliation(s)
- M Tsvirko
- Department od Experimental and Applied Physics, Faculty of Science and Technology, Jan Dlugosz University, ul. Armii Krajowej 13/15, Czestochowa, Poland
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Guo F, Friedman JM. Charge density-dependent modifications of hydration shell waters by Hofmeister ions. J Am Chem Soc 2009; 131:11010-8. [PMID: 19603752 PMCID: PMC2745343 DOI: 10.1021/ja902240j] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Gadolinium (Gd(3+)) vibronic sideband luminescence spectroscopy (GVSBLS) is used to probe, as a function of added Hofmeister series salts, changes in the OH stretching frequency derived from first-shell waters of aqueous Gd(3+) and of Gd(3+) coordinated to three different types of molecules: (i) a chelate (EDTA), (ii) structured peptides (mSE3/SE2) of the lanthanide-binding tags (LBTs) family with a single high-affinity binding site, and (iii) a calcium-binding protein (calmodulin) with four binding sites. The vibronic sideband (VSB) corresponding to the OH stretching mode of waters coordinated to Gd(3+), whose frequency is inversely correlated with the strength of the hydrogen bonding to neighboring waters, exhibits an increase in frequency when Gd(3+) becomes coordinated to either EDTA, calmodulin, or mSE3 peptide. In all of these cases, the addition of cation chloride or acetate salts to the solution increases the frequency of the vibronic band originating from the OH stretching mode of the coordinated waters in a cation- and concentration-dependent fashion. The cation dependence of the frequency increase scales with charge density of the cations, giving rise to an ordering consistent with the Hofmeister ordering. On the other hand, water Raman spectroscopy shows no significant change upon addition of these salts. Additionally, it is shown that the cation effect is modulated by the specific anion used. The results indicate a mechanism of action for Hofmeister series ions in which hydrogen bonding among hydration shell waters is modulated by several factors. High charge density cations sequester waters in a configuration that precludes strong hydrogen bonding to neighboring waters. Under such conditions, anion effects emerge as anions compete for hydrogen-bonding sites with the remaining free waters on the surface of the hydration shell. The magnitude of the anion effect is both cation and Gd(3+)-binding site specific.
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Affiliation(s)
- Feng Guo
- Department of Biophysics and Physiology, Albert Einstein College of Medicine, 1300 Morris Park Ave., Bronx, New York, U.S.A. 10461
| | - Joel M. Friedman
- Department of Biophysics and Physiology, Albert Einstein College of Medicine, 1300 Morris Park Ave., Bronx, New York, U.S.A. 10461
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Folding myoglobin within a sol-gel glass: protein folding constrained to a small volume. Biophys J 2008; 95:322-32. [PMID: 18339762 DOI: 10.1529/biophysj.106.097428] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The unfolding and refolding reaction of myoglobin was examined in solution and within a porous silica sol-gel glass. The sol-gel pores constrain the protein to a volume that is the same size and shape as the folded native state accompanied by a few layers of water solvation. Denaturants such as low pH buffers can be diffused through the gel pores to the protein to initiate unfolding and refolding. Acid-induced unfolding was hindered by the steric constraints imposed by the gel pores such that more denaturing conditions were required within the gel than in solution to create the unfolded state. No new folding intermediates were observed. Refolding of myoglobin was not complete in millimolar pH 7 buffer alone. Addition of 25% glycerol to the pH 7 buffer resulted in nearly complete refolding, and the use of 1 M phosphate buffer resulted in complete refolding. The role of this cosolvent and salt in disrupting the ordered water surrounding the protein within the gel is discussed in light of the Hofmeister series and entropic trapping via a diminished hydrophobic effect within the gel. These results are consistent with the premises of folding models in which secondary and tertiary structures are considered to form within a compact conformation of the protein backbone.
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Abbruzzetti S, Grandi E, Bruno S, Faggiano S, Spyrakis F, Mozzarelli A, Cacciatori E, Dominici P, Viappiani C. Ligand migration in nonsymbiotic hemoglobin AHb1 from Arabidopsis thaliana. J Phys Chem B 2007; 111:12582-90. [PMID: 17924689 DOI: 10.1021/jp074954o] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AHb1 is a hexacoordinated type 1 nonsymbiotic hemoglobin recently discovered in Arabidopsis thaliana. To gain insight into the ligand migration inside the protein, we studied the CO rebinding kinetics of AHb1 encapsulated in silica gels, in the presence of glycerol. The CO rebinding kinetics after nanosecond laser flash photolysis exhibits complex ligand migration patterns, consistent with the existence of discrete docking sites in which ligands can temporarily be stored before rebinding to the heme at different times. This finding may be of relevance to the physiological NO dioxygenase activity of this protein, which requires sequential binding of two substrates, NO and O2, to the heme.
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Affiliation(s)
- Stefania Abbruzzetti
- Dipartimento di Fisica, Università degli Studi di Parma, NEST CNR-INFM, Parma, Italy
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Roche CJ, Guo F, Friedman JM. Molecular level probing of preferential hydration and its modulation by osmolytes through the use of pyranine complexed to hemoglobin. J Biol Chem 2006; 281:38757-68. [PMID: 17057250 DOI: 10.1074/jbc.m608835200] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Two spectroscopic probes are used to expose molecular level changes in hydration shell water interactions that directly relate to such issues as preferential hydration and protein stability. The major focus of the present study is on the use of pyranine (HPT) fluorescence to probe as a function of added osmolytes (PEG, urea, trehalose, and magnesium), the extent to which glycerol is preferentially excluded from the hydration shell of free HPT and HPT localized in the diphosphoglycerate (DPG) binding site of hemoglobin in both solution and in Sol-Gel matrices. The pyranine study is complemented by the use of vibronic side band luminescence from the gadolinium cation that directly exposes the changes in hydrogen bonding between first and second shell waters as a function of added osmolytes. Together the results form the basis for a water partitioning model that can account for both preferential hydration and water/osmolyte-mediated conformational changes in protein structure.
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Affiliation(s)
- Camille J Roche
- Department of Physiology and Biophysics, Albert Einstein College of Medicine, Bronx, NY 10461, USA
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Ray A, Feng M, Tachikawa H. Direct electrochemistry and Raman spectroscopy of sol-gel-encapsulated myoglobin. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:7456-60. [PMID: 16042479 DOI: 10.1021/la050422s] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The direct electrochemistry of myoglobin (Mb) has been observed at a glassy carbon (GC) electrode coated with silica sol-gel-encapsulated Mb film. A well-behaved cyclic voltammogram is observed with a midpoint potential (E(1/2)) of -0.25 V vs Ag/AgCl in a pH 7.0 phosphate buffer. This potential, which is pH-dependent, is 70-90 mV more negative than the formal potential values obtained by using the spectroeletrochemical titration method at the same pH. Square wave voltametry (SWV) also shows a peak potential of -0.25 V for the reduction of Mb under the same experimental conditions. Both cathodic and anodic peak currents have a linear relationship with the scan rate. The midpoint potential decreases with pH, having a slope of -30 mV/pH. UV-vis and resonance Raman spectroscopic studies reveal that the sol-gel provides a bio-compatible environment where Mb retains a structure similar to its solution form, a 6-coordinated aquomet myoglobin. These results suggest that the silica sol-gel is a useful matrix for studying direct electrochemistry of other heme proteins.
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Affiliation(s)
- Anandhi Ray
- Department of Chemistry, Jackson State University, 1400 J.R. Lynch Street, Jackson, Mississippi 39217, USA
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Cordone L, Cottone G, Giuffrida S, Palazzo G, Venturoli G, Viappiani C. Internal dynamics and protein–matrix coupling in trehalose-coated proteins. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2005; 1749:252-81. [PMID: 15886079 DOI: 10.1016/j.bbapap.2005.03.004] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2004] [Revised: 03/04/2005] [Accepted: 03/04/2005] [Indexed: 11/23/2022]
Abstract
We review recent studies on the role played by non-liquid, water-containing matrices on the dynamics and structure of embedded proteins. Two proteins were studied, in water-trehalose matrices: a water-soluble protein (carboxy derivative of horse heart myoglobin) and a membrane protein (reaction centre from Rhodobacter sphaeroides). Several experimental techniques were used: Mossbauer spectroscopy, elastic neutron scattering, FTIR spectroscopy, CO recombination after flash photolysis in carboxy-myoglobin, kinetic optical absorption spectroscopy following pulsed and continuous photoexcitation in Q(B) containing or Q(B) deprived reaction centre from R. sphaeroides. Experimental results, together with the outcome of molecular dynamics simulations, concurred to give a picture of how water-containing matrices control the internal dynamics of the embedded proteins. This occurs, in particular, via the formation of hydrogen bond networks that anchor the protein surface to the surrounding matrix, whose stiffness increases by lowering the sample water content. In the conclusion section, we also briefly speculate on how the protein-matrix interactions observed in our samples may shed light on the protein-solvent coupling also in liquid aqueous solutions.
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Affiliation(s)
- Lorenzo Cordone
- Dipartimento di Scienze Fisiche ed Astronomiche, Università di Palermo, Italy.
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Sottini S, Viappiani C, Ronda L, Bettati S, Mozzarelli A. CO Rebinding Kinetics to Myoglobin- and R-State-Hemoglobin-Doped Silica Gels in the Presence of Glycerol. J Phys Chem B 2004. [DOI: 10.1021/jp049472g] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Silvia Sottini
- Dipartimento di Fisica, Università degli Studi di Parma, Parco Area delle Scienze 7/A, 43100 Parma, Italy; Dipartimento di Biochimica e Biologia Molecolare, Università degli Studi di Parma, Parco Area delle Scienze 23/A, 43100 Parma, Italy; Dipartimento di Sanità Pubblica, Università degli Studi di Parma, via Volturno 39, 43100 Parma, Italy; and Istituto Nazionale per la Fisica della Materia (INFM), c/o Dipartimento di Fisica, Università di Parma, parco area delle scienze 7A, 43100 Parma, Italy
| | - Cristiano Viappiani
- Dipartimento di Fisica, Università degli Studi di Parma, Parco Area delle Scienze 7/A, 43100 Parma, Italy; Dipartimento di Biochimica e Biologia Molecolare, Università degli Studi di Parma, Parco Area delle Scienze 23/A, 43100 Parma, Italy; Dipartimento di Sanità Pubblica, Università degli Studi di Parma, via Volturno 39, 43100 Parma, Italy; and Istituto Nazionale per la Fisica della Materia (INFM), c/o Dipartimento di Fisica, Università di Parma, parco area delle scienze 7A, 43100 Parma, Italy
| | - Luca Ronda
- Dipartimento di Fisica, Università degli Studi di Parma, Parco Area delle Scienze 7/A, 43100 Parma, Italy; Dipartimento di Biochimica e Biologia Molecolare, Università degli Studi di Parma, Parco Area delle Scienze 23/A, 43100 Parma, Italy; Dipartimento di Sanità Pubblica, Università degli Studi di Parma, via Volturno 39, 43100 Parma, Italy; and Istituto Nazionale per la Fisica della Materia (INFM), c/o Dipartimento di Fisica, Università di Parma, parco area delle scienze 7A, 43100 Parma, Italy
| | - Stefano Bettati
- Dipartimento di Fisica, Università degli Studi di Parma, Parco Area delle Scienze 7/A, 43100 Parma, Italy; Dipartimento di Biochimica e Biologia Molecolare, Università degli Studi di Parma, Parco Area delle Scienze 23/A, 43100 Parma, Italy; Dipartimento di Sanità Pubblica, Università degli Studi di Parma, via Volturno 39, 43100 Parma, Italy; and Istituto Nazionale per la Fisica della Materia (INFM), c/o Dipartimento di Fisica, Università di Parma, parco area delle scienze 7A, 43100 Parma, Italy
| | - Andrea Mozzarelli
- Dipartimento di Fisica, Università degli Studi di Parma, Parco Area delle Scienze 7/A, 43100 Parma, Italy; Dipartimento di Biochimica e Biologia Molecolare, Università degli Studi di Parma, Parco Area delle Scienze 23/A, 43100 Parma, Italy; Dipartimento di Sanità Pubblica, Università degli Studi di Parma, via Volturno 39, 43100 Parma, Italy; and Istituto Nazionale per la Fisica della Materia (INFM), c/o Dipartimento di Fisica, Università di Parma, parco area delle scienze 7A, 43100 Parma, Italy
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