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Jamuna NA, Kamalakshan A, Dandekar BR, Chittilappilly Devassy AM, Mondal J, Mandal S. Mechanistic Insight into the Amyloid Fibrillation Inhibition of Hen Egg White Lysozyme by Three Different Bile Acids. J Phys Chem B 2023; 127:2198-2213. [PMID: 36861956 DOI: 10.1021/acs.jpcb.3c00274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
Amyloid aggregation of protein is linked to many neurodegenerative diseases. Identification of small molecules capable of targeting amyloidogenic proteins has gained significant importance. Introduction of hydrophobic and hydrogen bonding interactions through site-specific binding of small molecular ligand to protein can effectively modulate the protein aggregation pathway. Here, we investigate the possible roles of three different bile acids, cholic acid (CA), taurocholic acid (TCA), and lithocholic acid (LCA) with varying hydrophobic and hydrogen bonding properties in inhibiting protein fibrillation. Bile acids are an important class of steroid compounds that are synthesized in the liver from cholesterol. Increasing evidence suggests that altered taurine transport, cholesterol metabolism, and bile acid synthesis have strong implications in Alzheimer's disease. We find that the hydrophilic bile acids, CA and TCA (taurine conjugated form of CA), are substantially more efficient inhibitors of lysozyme fibrillation than the most hydrophobic secondary bile acid LCA. Although LCA binds more strongly with the protein and masks the Trp residues more prominently through hydrophobic interactions, the lesser extent of hydrogen bonding interactions at the active site has made LCA a relatively weaker inhibitor of HEWL aggregation than CA and TCA. The introduction of a greater number of hydrogen bonding channels by CA and TCA with several key amino acid residues which are prone to form oligomers and fibrils has weakened the protein's internal hydrogen bonding capabilities for undergoing amyloid aggregation.
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Affiliation(s)
- Nidhi Anilkumar Jamuna
- Department of Chemistry, National Institute of Technology, Tiruchirappalli, Tamil Nadu 620015, India
| | - Adithya Kamalakshan
- Department of Chemistry, National Institute of Technology, Tiruchirappalli, Tamil Nadu 620015, India
| | | | | | | | - Sarthak Mandal
- Department of Chemistry, National Institute of Technology, Tiruchirappalli, Tamil Nadu 620015, India
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Thoppil AA, Chennuri BK, Gardas RL. Insights into the structural changes of bovine serum albumin in ethanolammonium laurate based surface active ionic liquids. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111229] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Takekiyo T, Yoshida K, Funahashi Y, Nagata S, Abe H, Yamaguchi T, Yoshimura Y. Helix-forming ability of proteins in alkylammonium nitrate. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.08.066] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Wright TA, Stewart JM, Page RC, Konkolewicz D. Extraction of Thermodynamic Parameters of Protein Unfolding Using Parallelized Differential Scanning Fluorimetry. J Phys Chem Lett 2017; 8:553-558. [PMID: 28067526 DOI: 10.1021/acs.jpclett.6b02894] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Thermodynamic properties of protein unfolding have been extensively studied; however, the methods used have typically required significant preparation time and high protein concentrations. Here we present a facile, simple, and parallelized differential scanning fluorimetry (DSF) method that enables thermodynamic parameters of protein unfolding to be extracted. This method assumes a two-state, reversible protein unfolding mechanism and provides the capacity to quickly analyze the biophysical mechanisms of changes in protein stability and to more thoroughly characterize the effect of mutations, additives, inhibitors, or pH. We show the utility of the DSF method by analyzing the thermal denaturation of lysozyme, carbonic anhydrase, chymotrypsin, horseradish peroxidase, and cellulase enzymes. Compared with similar biophysical analyses by circular dichroism, DSF allows for determination of thermodynamic parameters of unfolding while providing greater than 24-fold reduction in experimental time. This study opens the door to rapid characterization of protein stability on low concentration protein samples.
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Affiliation(s)
- Thaiesha A Wright
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
| | - Jamie M Stewart
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
| | - Richard C Page
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
| | - Dominik Konkolewicz
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
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Takekiyo T, Koyama Y, Yamazaki K, Abe H, Yoshimura Y. Ionic liquid-induced formation of the α-helical structure of β-lactoglobulin. J Phys Chem B 2013; 117:10142-8. [PMID: 23926920 DOI: 10.1021/jp405834n] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Structural modification of bovine milk β-lactoglobulin (β-LG) in aqueous 1-butyl-3-methylimidazolium nitrate ([bmim][NO3]) and ethylammonium nitrate ([EAN][NO3]) solutions has been investigated by Fourier transform infrared and circular dichroism spectroscopy. Remarkably, high ionic liquid (IL) concentrations (>15 mol %IL) caused formation of a non-native α-helical structure of β-LG and disruption of its tertiary structure. Furthermore, while [bmim][NO3] promoted protein aggregation, [EAN][NO3] inhibited it probably owing to differences in the unique solution structure (nanoheterogeneity) of the ILs by the different cationic species. The IL-induced α-helical formation of β-LG shows a behavior similar to the alcohol denaturation, but a disordered structure-rich state was observed in the β-α transition process by adding IL, in contrast to the case of an aqueous alcohol solution of protein. We propose that the molten salt-like property of aqueous IL solutions strongly support α-helical formation of proteins.
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Affiliation(s)
- Takahiro Takekiyo
- Department of Applied Chemistry, National Defense Academy, 1-10-20, Hashirimizu, Yokosuka, Japan 239-8686.
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Takekiyo T, Yamazaki K, Yamaguchi E, Abe H, Yoshimura Y. High Ionic Liquid Concentration-Induced Structural Change of Protein in Aqueous Solution: A Case Study of Lysozyme. J Phys Chem B 2012; 116:11092-7. [DOI: 10.1021/jp3057064] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Takahiro Takekiyo
- Department
of Applied Chemistry, and ‡Department of Materials Science and Engineering, National Defense Academy, 1-10-20, Hashirimizu,
Yokosuka, Japan 239-8686
| | - Kumiko Yamazaki
- Department
of Applied Chemistry, and ‡Department of Materials Science and Engineering, National Defense Academy, 1-10-20, Hashirimizu,
Yokosuka, Japan 239-8686
| | - Erika Yamaguchi
- Department
of Applied Chemistry, and ‡Department of Materials Science and Engineering, National Defense Academy, 1-10-20, Hashirimizu,
Yokosuka, Japan 239-8686
| | - Hiroshi Abe
- Department
of Applied Chemistry, and ‡Department of Materials Science and Engineering, National Defense Academy, 1-10-20, Hashirimizu,
Yokosuka, Japan 239-8686
| | - Yukihiro Yoshimura
- Department
of Applied Chemistry, and ‡Department of Materials Science and Engineering, National Defense Academy, 1-10-20, Hashirimizu,
Yokosuka, Japan 239-8686
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Kohno Y, Ohno H. Ionic liquid/water mixtures: from hostility to conciliation. Chem Commun (Camb) 2012; 48:7119-30. [PMID: 22683915 DOI: 10.1039/c2cc31638b] [Citation(s) in RCA: 223] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Water was originally inimical to ionic liquids (ILs) especially in the analysis of their detailed properties. Various data on the properties of ILs indicate that there are two ways to design functions of ionic liquids. The first is to change the structure of component ions, to provide "task-specific ILs". The second is to mix ILs with other components, such as other ILs, organic solvents or water. Mixing makes it easy to control the properties of the solution. In this strategy, water is now a very important partner. Below, we summarise our recent results on the properties of IL/water mixtures. Stable phase separation is an effective method in some separation processes. Conversely, a dynamic phase change between a homogeneous mixture and separation of phases is important in many fields. Analysis of the relation between phase behaviour and the hydration state of the component ions indicates that the pattern of phase separation is governed by the hydrophilicity of the ions. Sufficiently hydrophilic ions yielded ILs that are miscible with water, and hydrophobic ions gave stable phase separation with water. ILs composed of hydrophobic but hydrated ions undergo a dynamic phase change between a homogeneous mixture and separate phases according to temperature. ILs having more than seven water molecules per ion pair undergo this phase transition. These dynamic phase changes are considered, with some examples, and application is made to the separation of water-soluble proteins.
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Affiliation(s)
- Yuki Kohno
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16, Koganei, Tokyo, 184-8588, Japan
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Highly perturbed pKa values in the unfolded state of hen egg white lysozyme. Biophys J 2012; 102:1636-45. [PMID: 22500764 DOI: 10.1016/j.bpj.2012.02.048] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Revised: 01/28/2012] [Accepted: 02/13/2012] [Indexed: 11/21/2022] Open
Abstract
The majority of pK(a) values in protein unfolded states are close to the amino acid model pK(a) values, thus reflecting the weak intramolecular interactions present in the unfolded ensemble of most proteins. We have carried out thermal denaturation measurements on the WT and eight mutants of HEWL from pH 1.5 to pH 11.0 to examine the unfolded state pK(a) values and the pH dependence of protein stability for this enzyme. The availability of accurate pK(a) values for the folded state of HEWL and separate measurements of mutant-induced effects on the folded state pK(a) values, allows us to estimate the pK(a) values of seven acidic residues in the unfolded state of HEWL. Asp-48 and Asp-66 display pK(a) values of 2.9 and 3.1 in our analysis, thus representing the most depressed unfolded state pK(a) values observed to date. We observe a strong correlation between the folded state pK(a) values and the unfolded state pK(a) values of HEWL, thus suggesting that the unfolded state of HEWL possesses a large degree of native state characteristics.
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Mangialardo S, Gontrani L, Leonelli F, Caminiti R, Postorino P. Role of ionic liquids in protein refolding: native/fibrillar versus treated lysozyme. RSC Adv 2012. [DOI: 10.1039/c2ra21593d] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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