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Paul S, Paul S. How Does Aqueous Choline-O-Sulfate Solution Nullify the Action of Urea in Protein Denaturation? J Chem Inf Model 2018; 58:1858-1869. [DOI: 10.1021/acs.jcim.8b00395] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Srijita Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India−781039
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India−781039
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2
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Ghosh S, Dey S, Patel M, Chakrabarti R. Can an ammonium-based room temperature ionic liquid counteract the urea-induced denaturation of a small peptide? Phys Chem Chem Phys 2017; 19:7772-7787. [DOI: 10.1039/c6cp08842b] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The folding/unfolding equilibrium of proteins in aqueous medium can be altered by adding small organic molecules generally termed as co-solvents.
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Affiliation(s)
- Soumadwip Ghosh
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai – 400076
- India
| | - Souvik Dey
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai – 400076
- India
| | - Mahendra Patel
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai – 400076
- India
| | - Rajarshi Chakrabarti
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai – 400076
- India
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3
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Paul S, Paul S. Investigating the Counteracting Effect of Trehalose on Urea-Induced Protein Denaturation Using Molecular Dynamics Simulation. J Phys Chem B 2015; 119:10975-88. [DOI: 10.1021/acs.jpcb.5b01457] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Subrata Paul
- Department
of Chemistry, Indian Institute of Technology, Guwahati, Assam India-781039
| | - Sandip Paul
- Department
of Chemistry, Indian Institute of Technology, Guwahati, Assam India-781039
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4
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Holehouse AS, Garai K, Lyle N, Vitalis A, Pappu RV. Quantitative assessments of the distinct contributions of polypeptide backbone amides versus side chain groups to chain expansion via chemical denaturation. J Am Chem Soc 2015; 137:2984-95. [PMID: 25664638 PMCID: PMC4418562 DOI: 10.1021/ja512062h] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
In aqueous solutions with high concentrations of chemical denaturants such as urea and guanidinium chloride (GdmCl) proteins expand to populate heterogeneous conformational ensembles. These denaturing environments are thought to be good solvents for generic protein sequences because properties of conformational distributions align with those of canonical random coils. Previous studies showed that water is a poor solvent for polypeptide backbones, and therefore, backbones form collapsed globular structures in aqueous solvents. Here, we ask if polypeptide backbones can intrinsically undergo the requisite chain expansion in aqueous solutions with high concentrations of urea and GdmCl. We answer this question using a combination of molecular dynamics simulations and fluorescence correlation spectroscopy. We find that the degree of backbone expansion is minimal in aqueous solutions with high concentrations of denaturants. Instead, polypeptide backbones sample conformations that are denaturant-specific mixtures of coils and globules, with a persistent preference for globules. Therefore, typical denaturing environments cannot be classified as good solvents for polypeptide backbones. How then do generic protein sequences expand in denaturing environments? To answer this question, we investigated the effects of side chains using simulations of two archetypal sequences with amino acid compositions that are mixtures of charged, hydrophobic, and polar groups. We find that side chains lower the effective concentration of backbone amides in water leading to an intrinsic expansion of polypeptide backbones in the absence of denaturants. Additional dilution of the effective concentration of backbone amides is achieved through preferential interactions with denaturants. These effects lead to conformational statistics in denaturing environments that are congruent with those of canonical random coils. Our results highlight the role of side chain-mediated interactions as determinants of the conformational properties of unfolded states in water and in influencing chain expansion upon denaturation.
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Affiliation(s)
- Alex S. Holehouse
- Department of Biomedical Engineering and Center for Biological Systems Engineering, Washington University in St. Louis, One Brookings Drive, Campus Box 1097, St. Louis, MO 63130, USA
| | - Kanchan Garai
- Department of Biomedical Engineering and Center for Biological Systems Engineering, Washington University in St. Louis, One Brookings Drive, Campus Box 1097, St. Louis, MO 63130, USA
- TIFR Centre for Interdisciplinary Sciences, 21 Brundavan Colony, Narsingi, Hyderabad, 500075, India
| | - Nicholas Lyle
- Department of Biomedical Engineering and Center for Biological Systems Engineering, Washington University in St. Louis, One Brookings Drive, Campus Box 1097, St. Louis, MO 63130, USA
| | - Andreas Vitalis
- Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, CH-5807, Zurich, Switzerland
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5
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Reddy PM, Umapathi R, Venkatesu P. A green approach to offset the perturbation action of 1-butyl-3-methylimidazolium iodide on α-chymotrypsin. Phys Chem Chem Phys 2015; 17:184-90. [DOI: 10.1039/c4cp04180a] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The presence of [Bmim][Br] counteracts the strong denaturation action of [Bmim][I].
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Affiliation(s)
| | - R. Umapathi
- Department of Chemistry
- University of Delhi
- Delhi-110 007
- India
| | - P. Venkatesu
- Department of Chemistry
- University of Delhi
- Delhi-110 007
- India
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6
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On the influence of the mixture of denaturants on protein structure stability: A molecular dynamics study. Chem Phys 2014. [DOI: 10.1016/j.chemphys.2014.07.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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Xie W, Liu C, Yang L, Gao Y. On the molecular mechanism of ion specific Hofmeister series. Sci China Chem 2013. [DOI: 10.1007/s11426-013-5019-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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8
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Lee J. Exact partition function zeros of the Wako-Saitô-Muñoz-Eaton β hairpin model. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:022710. [PMID: 24032867 DOI: 10.1103/physreve.88.022710] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2013] [Indexed: 06/02/2023]
Abstract
I compute exact partition function zeros of β hairpins, using both analytic and numerical methods, extending previous work [J. Lee, Phys. Rev. Lett. 110, 248101 (2013)] where only a restricted class of hairpins was considered. The zeros of β hairpins with an odd number of peptide bonds are computed and the difference of the distribution of zeros from those for an even number of peptide bonds is explained in terms of additional entropy of liberating the extra bond at the turn region. Upon the introduction of a hydrophobic core in the central region of the hairpin, the zeros are distributed uniformly on two concentric circles corresponding to the hydrophobic collapse and the transition to the fully folded conformation. One of the circles dissolves as the core moves toward the turn or the tip region, which is explained in terms of the similarity of the intermediate state with the folded or unfolded states. The exact partition function zeros for a hairpin with a more complex structure of native contacts, the 16 C-terminal residues of streptococcal protein G B1, are numerically computed and their loci are closely approximated by concentric circles.
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Affiliation(s)
- Julian Lee
- Department of Bioinformatics and Life Science, Soongsil University, Seoul 156-743, Korea
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9
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Sarma R, Paul S. Interactions of S-peptide analogue in aqueous urea and trimethylamine-N-oxide solutions: A molecular dynamics simulation study. J Chem Phys 2013; 139:034504. [DOI: 10.1063/1.4813502] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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10
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Tsai M, Yuan J, Yamaki M, Lin C, Lin SH. Molecular Dynamics Insight into the Diverse Thermodynamic Behavior of a Beta‐Hairpin Peptide. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201300173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Min‐Yeh Tsai
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan 30010, ROC
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617, ROC
| | - Jian‐Min Yuan
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - Masahiro Yamaki
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan 30010, ROC
| | - Chih‐Kai Lin
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan 30010, ROC
| | - Sheng Hsien Lin
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan 30010, ROC
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11
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Sarma R, Paul S. Exploring the Molecular Mechanism of Trimethylamine-N-oxide’s Ability to Counteract the Protein Denaturing Effects of Urea. J Phys Chem B 2013; 117:5691-704. [DOI: 10.1021/jp401750v] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rahul Sarma
- Department of Chemistry, Indian Institute of Technology, Guwahati Assam, India-781039
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati Assam, India-781039
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12
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Shao Q, Fan Y, Yang L, Gao YQ. Counterion Effects on the Denaturing Activity of Guanidinium Cation to Protein. J Chem Theory Comput 2012; 8:4364-73. [DOI: 10.1021/ct3002267] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Qiang Shao
- Institute of Theoretical and
Computational Chemistry, College of Chemistry and Molecular Engineering,
Beijing National Laboratory of Molecular Sciences, Peking University, Beijing 100871, China
- Drug Discovery and Design Center,
Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai, 201203,
China
| | - Yubo Fan
- Bioinformatics and
Bioengineering
Program, The Methodist Hospital Research Institute, Weill Cornell Medical College, Houston, Texas 77030, United
States
| | - Lijiang Yang
- Institute of Theoretical and
Computational Chemistry, College of Chemistry and Molecular Engineering,
Beijing National Laboratory of Molecular Sciences, Peking University, Beijing 100871, China
| | - Yi Qin Gao
- Institute of Theoretical and
Computational Chemistry, College of Chemistry and Molecular Engineering,
Beijing National Laboratory of Molecular Sciences, Peking University, Beijing 100871, China
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13
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Affiliation(s)
- Yi Qin Gao
- Institute of Theoretical
and Computational Chemistry,
College of Chemistry and Molecular Engineering, Peking National Laboratory
for Molecular Sciences, Peking University, Beijing, China, 100871
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14
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Shao Q, Fan Y, Yang L, Qin Gao Y. From protein denaturant to protectant: Comparative molecular dynamics study of alcohol/protein interactions. J Chem Phys 2012; 136:115101. [DOI: 10.1063/1.3692801] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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