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Senft MD, Maier R, Hiremath A, Zhang F, Schreiber F. Effective interactions and phase behavior of protein solutions in the presence of hexamine cobalt(III) chloride. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2023; 46:119. [PMID: 38051398 PMCID: PMC10698144 DOI: 10.1140/epje/s10189-023-00376-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Accepted: 11/09/2023] [Indexed: 12/07/2023]
Abstract
It is well established that deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) exhibit a reentrant condensation (RC) phase behavior in the presence of the trivalent hexamine cobalt(III) cations (Hac) which can be important for their packing and folding. A similar behavior can be observed for negatively charged globular proteins in the presence of trivalent metal cations, such as Y3+ or La3+. This phase behavior is mainly driven by charge inversion upon an increasing salt concentration for a fixed protein concentration (cp). However, as Hac exhibits structural differences compared to other multivalent metal cations, with six ammonia ligands (NH3) covalently bonded to the central cobalt atom, it is not clear that Hac can induce a similar phase behavior for proteins. In this work, we systematically investigate whether negatively charged globular proteins β-lactoglobulin (BLG), bovine serum albumin (BSA), human serum albumin (HSA) and ovalbumin (OVA) feature Hac-induced RC. Effective protein-protein interactions were investigated by small-angle X-ray scattering. The reduced second virial coefficient (B2/B2HS) was obtained as a function of salt concentration. The virial coefficient analysis performed confirms the reentrant interaction (RI) behavior for BLG without actually inducing RC, given the insufficient strengths of the interactions for the latter to occur. In contrast, the strength of attraction for BSA, HSA and OVA are too weak to show RC. Model free analysis of the inverse intensity [Formula: see text] also supports this finding. Looking at different q-range by employing static (SLS) and dynamic light scattering experiments, the presence of RI behavior can be confirmed. The results are further discussed in view of metal cation binding sites in nucleic acids (DNA and RNA), where Hac induced RC phase behavior.
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Affiliation(s)
- Maximilian D Senft
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany.
| | - Ralph Maier
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | - Anusha Hiremath
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | - Fajun Zhang
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany.
| | - Frank Schreiber
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
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Mandal P, Molla AR. Solvent Perturbation of Protein Structures - A Review Study with Lectins. Protein Pept Lett 2020; 27:538-550. [PMID: 31682206 DOI: 10.2174/0929866526666191104145511] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 08/05/2019] [Accepted: 08/07/2019] [Indexed: 01/07/2023]
Abstract
Use of organic molecules as co-solvent with water, the ubiquitous biological solvent, to perturb the structure of proteins is popular in the research area of protein structure and folding. These organic co-solvents are believed to somehow mimic the environment near the cell membrane. Apart from that they induce non-native states which can be present in the protein folding pathway or those states also may be representative of the off pathway structures leading to amyloid formation, responsible for various fatal diseases. In this review, we shall focus on organic co-solvent induced structure perturbation of various members of lectin family. Lectins are excellent model systems for protein folding study because of its wide occurrence, diverse structure and versatile biological functions. Lectins were mainly perturbed by two fluoroalcohols - 2,2,2- trifluoroethanol and 1,1,1,3,3,3-hexafluoroisopropanol whereas glycerol, ethylene glycol and polyethylene glycols were used in some cases. Overall, all native lectins were denatured by alcohols and most of the denatured lectins have predominant helical secondary structure. But characterization of the helical states and the transition pathway for various lectins revealed diverse result.
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Affiliation(s)
- Pritha Mandal
- Department of Chemistry, Krishnagar Government College, Krishnagar, West Bengal-741101, India
| | - Anisur R Molla
- Department of Chemistry, Bidhannagar College, Salt Lake, Kolkata -700 064, India
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Yang F, Zou L, Wu Y, Wu Z, Yang A, Chen H, Li X. Structure and allergenicity assessments of bovine β-lactoglobulin treated by sonication-assisted irradiation. J Dairy Sci 2020; 103:4109-4120. [DOI: 10.3168/jds.2019-17070] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 12/18/2019] [Indexed: 12/19/2022]
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Fei S, Zou L, Xie X, Yang F, Chen H, Li X. Purification and Characterization of Bovine β-Lactoglobulin Variants A and B (Characterization of Bovine β-Lactoglobulin Variants). FOOD SCIENCE AND TECHNOLOGY RESEARCH 2020. [DOI: 10.3136/fstr.26.399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Shuangwen Fei
- State Key Laboratory of Food Science and Technology, Nanchang University
- School of Food Science & Technology Nanchang University
| | - Li Zou
- State Key Laboratory of Food Science and Technology, Nanchang University
- School of Food Science & Technology Nanchang University
| | - Xiuling Xie
- State Key Laboratory of Food Science and Technology, Nanchang University
- School of Food Science & Technology Nanchang University
| | - Fan Yang
- State Key Laboratory of Food Science and Technology, Nanchang University
- School of Food Science & Technology Nanchang University
| | - Hongbing Chen
- State Key Laboratory of Food Science and Technology, Nanchang University
- Jiangxi-OAI Joint Research Institute, Nanchang University
| | - Xin Li
- State Key Laboratory of Food Science and Technology, Nanchang University
- School of Food Science & Technology Nanchang University
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Yadav NS, Choudhury D. Conformational perturbation of peptides in presence of polar organic solvents. J Mol Graph Model 2019; 89:1-12. [PMID: 30831385 DOI: 10.1016/j.jmgm.2019.02.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 02/08/2019] [Accepted: 02/20/2019] [Indexed: 11/17/2022]
Abstract
The critical role played by solvent environment in maintaining the conformational integrity of peptides and proteins is accepted without question. Numerous experiments have suggested that perturbing the solvent environment of peptides and proteins by the addition of polar organic solvents have important consequences for the conformation of these molecules. However, experimental studies of such perturbations often report different kinds of effects depending on the solvent used and/or the sequence/structure of the molecule under study. In this work we report a simulation based comparative study on the effects of adding two common organic solvents viz. Dimethyl sulfoxide (DMSO) and Acetonitrile (MeCN) on the dynamical conformation of a test peptide Ace-Gly-X-Gly-Nme where X is any amino acid. Our studies identify important differences in peptide solvation by these two solvents, which we attempt to correlate with the kinetic stability of the conformation, as well as the identity of the central 'X' residue in the test peptide.
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Affiliation(s)
- Neetu Singh Yadav
- School of Biotechnology, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Devapriya Choudhury
- School of Biotechnology, Jawaharlal Nehru University, New Delhi, 110067, India.
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Kaur J, Yadav NS, Singh MK, Khan MJ, Sen S, Dixit A, Choudhury D. Role of Ser65, His148 and Thr203 in the Organic Solvent-dependent Spectral Shift in Green Fluorescent Protein. Photochem Photobiol 2018; 95:543-555. [PMID: 30240005 DOI: 10.1111/php.13018] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Accepted: 09/04/2018] [Indexed: 01/10/2023]
Abstract
The photophysics of green fluorescent protein (GFP) is remarkable because of its exceptional property of excited state proton transfer (ESPT) and the presence of a functional proton wire. Another interesting property of wild-type GFP is that its absorption and fluorescence excitation spectra are sensitive to the presence of polar organic solvents even at very low concentrations. Here, we use a combination of methodologies including site-specific mutagenesis, absorption spectroscopy, steady-state and time-resolved fluorescence measurements and all-atom molecular dynamics simulations in explicit solvent, to uncover the mechanism behind the unique spectral sensitivity of GFP toward organic solvents. Based on the evidences provided herein, we suggest that organic solvent-induced changes in the proton wire prevent ground state movement of a proton through the wire and thus bring about the spectral changes observed. The present study can not only help to understand the mechanism of proton transfer by further dissecting the intricate steps in GFP photophysics but also encourages to develop GFP-based organic solvent biosensors.
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Affiliation(s)
- Jasvir Kaur
- School of Biotechnology, Jawaharlal Nehru University, New Delhi, India
| | - Neetu Singh Yadav
- School of Biotechnology, Jawaharlal Nehru University, New Delhi, India
| | | | - Mohd Jahir Khan
- School of Biotechnology, Jawaharlal Nehru University, New Delhi, India
| | - Sobhan Sen
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Aparna Dixit
- School of Biotechnology, Jawaharlal Nehru University, New Delhi, India
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Design of bio-based supramolecular structures through self-assembly of α-lactalbumin and lysozyme. Food Hydrocoll 2016. [DOI: 10.1016/j.foodhyd.2016.02.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Pal S, Maity S, Sardar S, Chakraborty J, Halder UC. Insight into the co-solvent induced conformational changes and aggregation of bovine β-lactoglobulin. Int J Biol Macromol 2015; 84:121-34. [PMID: 26657584 DOI: 10.1016/j.ijbiomac.2015.11.055] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2015] [Revised: 09/05/2015] [Accepted: 11/20/2015] [Indexed: 11/15/2022]
Abstract
Many proteins form ordered irreversible aggregates called amyloid fibrils which are responsible for several neurodegenerative diseases. β-lactoglobulin (β-lg), an important globular milk protein, self-assembles to form amyloid-like fibrils on heating at low pH. The present study investigated the effects of two commonly used organic solvents acetonitrile (MeCN) and antimicrobial preservative benzyl alcohol (BA) on the conformation and self-assembly of β-lg at ambient condition. Both MeCN and BA induced a concentration-dependent conformational change showing exposure of hydrophobic patches, loss of tertiary structure and higher α-helical structure at moderate concentrations. In the presence of 50-80% (v/v) MeCN and 1.5-3% (v/v) BA further structural transitions from α-helical to non-native β-sheet structure were observed with a molten globule-like intermediate at 70% MeCN. These non-native β-sheet structures have high tendency to form aggregates. The formation of β-lg self-assembly was confirmed by Thioflavin T studies, Congo red assay, Rayleigh scattering and dynamic light scattering analysis. Transmission electron microscopy studies showed amyloid fibril formation in both MeCN and BA. Our results showed that BA enhances the unfolding and self-assembly of β-lg at much lower concentration than MeCN. Thus solvent composition forces the protein to achieve the non-native structures which are responsible for protein aggregation.
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Affiliation(s)
- Sampa Pal
- Organic Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata, 700032, India
| | - Sanhita Maity
- Organic Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata, 700032, India
| | - Subrata Sardar
- Organic Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata, 700032, India
| | - Jishnu Chakraborty
- Organic Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata, 700032, India
| | - Umesh Chandra Halder
- Organic Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata, 700032, India.
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Non-fluorinated cosolvents: A potent amorphous aggregate inducer of metalloproteinase-conalbumin (ovotransferrin). Int J Biol Macromol 2015; 78:417-28. [DOI: 10.1016/j.ijbiomac.2015.04.021] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2015] [Revised: 04/09/2015] [Accepted: 04/10/2015] [Indexed: 10/23/2022]
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Diniz RS, Coimbra JSDR, Teixeira ÁVNDC, da Costa AR, Santos IJB, Bressan GC, da Cruz Rodrigues AM, da Silva LHM. Production, characterization and foamability of α-lactalbumin/glycomacropeptide supramolecular structures. Food Res Int 2014; 64:157-165. [PMID: 30011635 DOI: 10.1016/j.foodres.2014.05.079] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Revised: 05/26/2014] [Accepted: 05/30/2014] [Indexed: 12/26/2022]
Abstract
The study of protein interactions has generated great interest in the food industry. Therefore, research on new supramolecular structures shows promise. Supramolecular structures of the whey proteins α-lactalbumin and glycomacropeptide were produced under varying heat treatments (25 to 75°C) and acidic conditions (pH3.5 to 6.5). Isothermal titration calorimetry experiments showed protein interactions and demonstrated that this is an enthalpically driven process. Supramolecular protein structures in aqueous solutions were characterized by circular dichroism and intrinsic fluorescence spectroscopy. Additional photon correlation spectroscopy experiments showed that the size distribution of the structures ranged from 4 to 3545nm among the different conditions. At higher temperatures, lower pH increased particle size. The foamability of the supramolecular protein structures was evaluated. Analysis of variance and analysis of regression for foaming properties indicated that the two-factor interactions between pH and temperature exhibited a significant effect on the volume and stability of the foam.
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Affiliation(s)
- Renata Silva Diniz
- Faculdade de Engenharia de Alimentos, Instituto de Tecnologia, Universidade Federal do Pará, Campus do Guamá 66000-000, Belém, PA, Brazil
| | - Jane Sélia Dos Reis Coimbra
- Departamento de Tecnologia de Alimentos, Universidade Federal de Viçosa, Campus Universitário s/n, Centro, 36570-000, Viçosa, MG, Brazil.
| | | | - Angélica Ribeiro da Costa
- Departamento de Tecnologia de Alimentos, Universidade Federal de Viçosa, Campus Universitário s/n, Centro, 36570-000, Viçosa, MG, Brazil
| | - Igor José Boggione Santos
- Departamento de Tecnologia de Alimentos, Universidade Federal de Viçosa, Campus Universitário s/n, Centro, 36570-000, Viçosa, MG, Brazil
| | - Gustavo Costa Bressan
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Viçosa, Campus Universitário s/n, Centro, 36570-000, Viçosa, MG, Brazil
| | - Antonio Manuel da Cruz Rodrigues
- Faculdade de Engenharia de Alimentos, Instituto de Tecnologia, Universidade Federal do Pará, Campus do Guamá 66000-000, Belém, PA, Brazil
| | - Luiza Helena Meller da Silva
- Faculdade de Engenharia de Alimentos, Instituto de Tecnologia, Universidade Federal do Pará, Campus do Guamá 66000-000, Belém, PA, Brazil
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