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Pineda-Alemán R, Cabarcas-Herrera C, Alviz-Amador A, Galindo-Murillo R, Pérez-Gonzalez H, Rodríguez-Cavallo E, Méndez-Cuadro D. Molecular dynamics of structural effects of reactive carbonyl species derivate of lipid peroxidation on bovine serum albumin. Biochim Biophys Acta Gen Subj 2024; 1868:130613. [PMID: 38593934 DOI: 10.1016/j.bbagen.2024.130613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 03/09/2024] [Accepted: 04/04/2024] [Indexed: 04/11/2024]
Abstract
BACKGROUND Serum albumin is the most abundant protein in the Mammalia blood plasma at where plays a decisive role in the transport wide variety of hydrophobic ligands. BSA undergoes oxidative modifications like the carbonylation by the reactive carbonyl species (RCSs) 4-hydroxy-2-nonenal (HNE), 4 hydroxy-2-hexenal (HHE), malondialdehyde (MDA) and 4-oxo-2-nonenal (ONE), among others. The structural and functional changes induced by protein carbonylation have been associated with the advancement of neurodegenerative, cardiovascular, metabolic and cancer diseases. METHODS To elucidate structural effects of protein carbonylation with RCSs on BSA, parameters for six new non-standard amino acids were designated and molecular dynamics simulations of its mono‑carbonylated-BSA systems were conducted in the AMBER force field. Trajectories were evaluated by RMSD, RMSF, PCA, RoG and SASA analysis. RESULTS An increase in the conformational instability for all proteins modified with local changes were observed, without significant changes on the BSA global three-dimensional folding. A more relaxed compaction level and major solvent accessible surface area for modified systems was found. Four regions of high molecular fluctuation were identified in all modified systems, being the subdomains IA and IIIB those with the most remarkable local conformational changes. Regarding essential modes of domain movements, it was evidenced that the most representatives were those related to IA subdomain, while IIIB subdomain presented discrete changes. CONCLUSIONS RCSs induces local structural changes on mono‑carbonylated BSA. Also, this study extends our knowledge on how carbonylation by RCSs induce structural effects on proteins.
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Affiliation(s)
- Rafael Pineda-Alemán
- Analytical Chemistry and Biomedicine Group, Medicine Faculty, University of Cartagena, Cartagena, Colombia
| | - Camila Cabarcas-Herrera
- Analytical Chemistry and Biomedicine Group, Exact and Natural Sciences Faculty, University of Cartagena, Cartagena, Colombia
| | - Antistio Alviz-Amador
- Analytical Chemistry and Biomedicine Group, Pharmaceutical Sciences Faculty, University of Cartagena, Cartagena, Colombia
| | | | - Humberto Pérez-Gonzalez
- Department of Mathematics, Exact and Natural Sciences Faculty, University of Cartagena, Cartagena, Colombia
| | - Erika Rodríguez-Cavallo
- Analytical Chemistry and Biomedicine Group, Pharmaceutical Sciences Faculty, University of Cartagena, Cartagena, Colombia
| | - Darío Méndez-Cuadro
- Analytical Chemistry and Biomedicine Group, Exact and Natural Sciences Faculty, University of Cartagena, Cartagena, Colombia.
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2
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Mohanty S, Mishra SS, Kuldeep, Maharana J, Subuddhi U. Insight into the Effect of Submicellar Concentrations of Sodium Deoxycholate on the Structure, Stability, and Activity of Bovine and Human Serum Albumin: An Interesting Comparison between Single and Double Tryptophan Proteins. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:5228-5244. [PMID: 38413419 DOI: 10.1021/acs.langmuir.3c03541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/29/2024]
Abstract
The progressive escalation in the applications of bile salts in diverse fields has triggered research on their interaction with various biological macromolecules, especially with proteins. A proper understanding of the interaction process of bile salts, particularly in the lower concentrations range, with the serum albumin seems important since the normal serum concentration of bile salts is approximately in the micromolar range. The current study deals with a comprehensive and comparative analysis of the interaction of submicellar concentrations of sodium deoxycholate (NaDC) with two homologous transport proteins: bovine serum albumin (BSA) and human serum albumin (HSA). HSA and BSA with one and two tryptophans, respectively, provide the opportunity for an interesting comparison of tryptophan fluorescence behavior on interaction with NaDC. The study suggests a sequential interaction of NaDC in three discrete stages with the two proteins. A detailed study using warfarin and ibuprofen as site markers provides information about the sites of interaction, which is further confirmed by inclusive molecular dynamics simulation analysis. Moreover, the comparison of the thermodynamics and stability of the NaDC-serum albumin complexes confirms the stronger interaction of NaDC with BSA as compared to that with HSA. The differential interaction between the bile salt and the two serum albumins is further established from the difference in the extent of decrease in the esterase-like activity assay of the proteins in the presence of NaDC. Therefore, the present study provides important insight into the effect of submicellar concentrations of NaDC on the structure, stability, and activity of the two homologous serum albumins and thus can contribute not only to the general understanding of the complex nature of serum albumin-bile salt interactions but also to the design of more effective pharmaceutical formulations in the field of drug delivery and biomedical research.
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Affiliation(s)
- Subhrajit Mohanty
- Department of Chemistry, National Institute of Technology, Rourkela 769008, Odisha, India
| | - Smruti Snigdha Mishra
- Department of Chemistry, National Institute of Technology, Rourkela 769008, Odisha, India
| | - Kuldeep
- Department of Chemistry, National Institute of Technology, Rourkela 769008, Odisha, India
| | - Jitendra Maharana
- Distributed Information Centre, Department of Agricultural Biotechnology, Assam Agricultural University, Jorhat 785013, Assam, India
| | - Usharani Subuddhi
- Department of Chemistry, National Institute of Technology, Rourkela 769008, Odisha, India
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3
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Priyadarshi A, Devi HM, Swaminathan R. Disruption of Spatial Proximities among Charged Groups in Equilibrium-Denatured States of Proteins Tracked Using Protein Charge Transfer Spectra. Biochemistry 2023. [PMID: 37162303 DOI: 10.1021/acs.biochem.3c00006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The absorption and luminescence originating from protein charge transfer spectra (ProCharTS) depend on the proximity between multiple charged groups in a protein. This makes ProCharTS absorbance/luminescence intensity a sensitive probe for detecting changes in the protein structure, which alter the proximity among charged groups in the protein. In this work, ProCharTS absorbance of charge-rich proteins like human serum albumin (HSA), α3C, and α3W was used to monitor structural changes upon chemical denaturant-induced protein unfolding under equilibrium conditions. The denaturation midpoints were estimated using nonlinear regression analysis. For HSA, absorbance at 325 and 340 nm estimated the GdnHCl-induced denaturation midpoints to be 0.80 and 0.61 M, respectively. A similar analysis of α3C and α3W ProCharTS absorbance yielded denaturation midpoints of 0.88 and 0.86 M at 325 nm and 0.96 and 0.66 M at 340 nm, respectively. A previously reported molten globule-like state in the GdnHCl-induced HSA unfolding pathway was detected by the increase in HSA ProCharTS absorbance at 0.5 M GdnHCl. To validate the above results, protein unfolding was additionally monitored using conventional methods like circular dichroism (CD), Trp, and dansyl fluorescence. Our results suggest that disruption of charged amino acid sidechain contacts as revealed by ProCharTS occurs at lower denaturant concentrations compared to the loss of secondary/folded structure monitored by CD and fluorescence. Further, HSA ProCharTS absorbance at 315-340 nm revealed that tertiary contacts among charged residues were disrupted at lower GdnHCl concentrations compared to sequence adjacent contacts. Our data underscore the utility of ProCharTS as a novel label-free tool to track unfolding in charge-rich proteins.
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Affiliation(s)
- Anurag Priyadarshi
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
| | - Himanshi Maniram Devi
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
| | - Rajaram Swaminathan
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
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4
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Liang Z, Sun Y, Zeng H, Qin H, Yang R, Qu L, Zhang K, Li Z. Broad-Specificity Screening of Pyrethroids Enabled by the Catalytic Function of Human Serum Albumin on Coumarin Hydrolysis. Anal Chem 2023; 95:5678-5686. [PMID: 36952638 DOI: 10.1021/acs.analchem.2c05556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/25/2023]
Abstract
Sensing systems based on cholinesterase and carboxylesterase coupled with different transduction technologies have emerged for pesticide screening owing to their simple operation, fast response, and suitability for on-site analysis. However, the broad spectrum and specificity screening of pyrethroids over organophosphates and carbamates remains an unmet challenge for current enzymatic sensors. Human serum albumin (HSA), a multifunctional protein, can promote various chemical transformations and show a high affinity for pyrethroids, which offer a route for specific and broad-spectrum pyrethroid screening. Herein, for the first time, we evaluated the catalytic hydrolysis function of human serum albumin (HSA) on the coumarin lactone bond and revealed that HSA can act as an enzyme to catalyze the hydrolysis of the coumarin lactone bond. Molecular docking and chemical modifications indicate that lysine 199 and tyrosine 411 serve as the catalytic general base and contribute to most of the catalytic activity. Utilizing this enzymatic activity, a broad specific ratiometric fluorescence pyrethroids sensing system was developed. The binding energetics and binding constants of pesticides and HSA show that pyrethroids bind to HSA more easily than organophosphates and carbamates, which is responsible for the specificity of the sensing system. This study provides a general sensor platform and strategy for screening pesticides and reveals the catalytic activity of HSA on the hydrolysis of the coumarin lactone bond, which may open innovative horizons for the chemical sensing and biomedical applications of HSA.
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Affiliation(s)
- Zengqiang Liang
- College of Chemistry, Green Catalysis Center, Henan Joint International Research Laboratory of Green Construction of Functional Molecules and Their Bioanalytical Applications, Zhengzhou Key Laboratory of Functional Nanomaterial and Medical Theranostic, Zhengzhou University, Zhengzhou 450001, China
| | - Yuanqiang Sun
- College of Chemistry, Green Catalysis Center, Henan Joint International Research Laboratory of Green Construction of Functional Molecules and Their Bioanalytical Applications, Zhengzhou Key Laboratory of Functional Nanomaterial and Medical Theranostic, Zhengzhou University, Zhengzhou 450001, China
| | - Huajin Zeng
- School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, China
| | - Haimei Qin
- Fujian Provincial Key Lab of Theoretical and Computational Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Ran Yang
- College of Chemistry, Green Catalysis Center, Henan Joint International Research Laboratory of Green Construction of Functional Molecules and Their Bioanalytical Applications, Zhengzhou Key Laboratory of Functional Nanomaterial and Medical Theranostic, Zhengzhou University, Zhengzhou 450001, China
| | - Lingbo Qu
- College of Chemistry, Green Catalysis Center, Henan Joint International Research Laboratory of Green Construction of Functional Molecules and Their Bioanalytical Applications, Zhengzhou Key Laboratory of Functional Nanomaterial and Medical Theranostic, Zhengzhou University, Zhengzhou 450001, China
- Key Laboratory of Food Safety Quick Testing and Smart Supervision Technology for State Market Regulation, Zhengzhou 450001, China
| | - Ke Zhang
- Department of Chemistry and Chemical Biology, Northeastern University, Boston, Massachusetts 02115, United States
| | - Zhaohui Li
- College of Chemistry, Green Catalysis Center, Henan Joint International Research Laboratory of Green Construction of Functional Molecules and Their Bioanalytical Applications, Zhengzhou Key Laboratory of Functional Nanomaterial and Medical Theranostic, Zhengzhou University, Zhengzhou 450001, China
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5
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Nikfarjam S, Gibbons R, Burni F, Raghavan SR, Anisimov MA, Woehl TJ. Chemically Fueled Dissipative Cross-Linking of Protein Hydrogels Mediated by Protein Unfolding. Biomacromolecules 2023; 24:1131-1140. [PMID: 36795055 DOI: 10.1021/acs.biomac.2c01186] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
Cells assemble dynamic protein-based nanostructures far from equilibrium, such as microtubules, in a process referred to as dissipative assembly. Synthetic analogues have utilized chemical fuels and reaction networks to form transient hydrogels and molecular assemblies from small molecule or synthetic polymer building blocks. Here, we demonstrate dissipative cross-linking of transient protein hydrogels using a redox cycle, which exhibit protein unfolding-dependent lifetimes and mechanical properties. Fast oxidation of cysteine groups on bovine serum albumin by hydrogen peroxide, the chemical fuel, formed transient hydrogels with disulfide bond cross-links that degraded over hours by a slow reductive back reaction. Interestingly, despite increased cross-linking, the hydrogel lifetime decreased as a function of increasing denaturant concentration. Experiments showed that the solvent-accessible cysteine concentration increased with increasing denaturant concentration due to unfolding of secondary structures. The increased cysteine concentration consumed more fuel, which led to less direction oxidation of the reducing agent and affected a shorter hydrogel lifetime. Increased hydrogel stiffness, disulfide cross-linking density, and decreased oxidation of redox-sensitive fluorescent probes at a high denaturant concentration provided evidence supporting the unveiling of additional cysteine cross-linking sites and more rapid consumption of hydrogen peroxide at higher denaturant concentrations. Taken together, the results indicate that the protein secondary structure mediated the transient hydrogel lifetime and mechanical properties by mediating the redox reactions, a feature unique to biomacromolecules that exhibit a higher order structure. While prior works have focused on the effects of the fuel concentration on dissipative assembly of non-biological molecules, this work demonstrates that the protein structure, even in nearly fully denatured proteins, can exert similar control over reaction kinetics, lifetime, and resulting mechanical properties of transient hydrogels.
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Affiliation(s)
- Shakiba Nikfarjam
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States
| | - Rebecca Gibbons
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States
| | - Faraz Burni
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States
| | - Srinivasa R Raghavan
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States
| | - Mikhail A Anisimov
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States
- Institute for Physical Sciences and Technology, University of Maryland, College Park, Maryland 20740, United States
| | - Taylor J Woehl
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States
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6
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Mukherjee M, Saha Sardar P, Basu Roy M, Mukherjee P, Ghosh R, Ghosh S. Tracking Zone-wise perturbation during unfolding of some globular proteins using Eu(III) complex of Tetracycline as a probe exhibiting Stark splitting. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 264:120231. [PMID: 34365134 DOI: 10.1016/j.saa.2021.120231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 07/14/2021] [Accepted: 07/24/2021] [Indexed: 06/13/2023]
Abstract
Enhanced 'Antenna effect' of a suitably designed ternary complex of Eu(III), Tetracycline hydrochloride (TC) and globular proteins viz bovine serum albumin (BSA), human serum albumin (HSA) and β-lactoglobulin A (BLGA) in aqueous medium is employed to characterize the different partially unfolded states along with investigation of the micro- heterogeneous environment of the proteins during their stepwise unfolding. The zone-wise perturbation for the proteins upon denaturation by Urea and Guanidine hydrochloride (Gdn. HCl) is followed by the emission of Eu(III) through 'Antenna Effect' and that of the tryptophan (Trp) residues of the proteins as a function of denaturants both by steady state and time resolved emission study. With Gdn. HCl as denaturant, both BSA and BLGA show quenching of Eu(III) emission compared to pure protein while HSA exhibits an enhancement of antenna effect during unfolding as compared to that in its absence. In the presence of Urea, HSA and BSA show enhancement of antenna effect accompanied by Stark splitting of the 5D0→7F2 transition of Eu(III) although BLGA follows the similar pattern of quenching of Eu(III) emission as observed with Gdn. HCl without any Stark splitting. The proteins exhibit a two state transition with ΔGD values of ~ 2-3 kcal mol-1. Thus the use of Eu(III) emission as an efficient probe is advocating here to rationalize the microenvironment of the proteins during their stepwise unfolding.
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Affiliation(s)
- Moumita Mukherjee
- Present Address: Sri Aurobindo Vidyamandir, Chandannagar, Hoogly, West Bengal, India
| | - Pinki Saha Sardar
- Department of Chemistry, The Bhawanipur Education Society College, Kolkata-700020, West Bengal, India
| | - Maitrayee Basu Roy
- Department of Chemistry, Vidyasagar College for Women, Kolkata-700006, West Bengal, India
| | - Priyanka Mukherjee
- Department of Chemistry and Biochemistry, Asutosh College, Kolkata-700026, India
| | - Rina Ghosh
- Department of Chemistry, St. Xavier's College, Kolkata-700013, India
| | - Sanjib Ghosh
- Department of Chemistry, Adamas University, Barasat, West Bengal, India.
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7
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Luo Y, Yu QQ, Gao JJ, Lang XX, Li HY, Yu XF, Qi XY, Wang MQ. Design, synthesis and mechanistic studies of a TICT based fluorogenic probe for lighting up protein HSA. Bioorg Med Chem Lett 2021; 53:128438. [PMID: 34740774 DOI: 10.1016/j.bmcl.2021.128438] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Revised: 10/05/2021] [Accepted: 10/28/2021] [Indexed: 01/11/2023]
Abstract
Human serum albumin (HSA) in blood serves as an important biomarker for clinical diagnosis, and fluorescence sensing method has attracted extensive attention. In this work, a small organic molecule probe, YS8, involving twisted intramolecular charge transfer (TICT) characteristic, was designed and investigated to detect HSA. YS8 kept silent state in fluorescence under physiological conditions, but the encapsulation of YS8 in the hydrophobic subdomain IB region of HSA inhibited the TICT state and produced a clear light-up fluorescent signal. Especially, YS8 was demonstrated to be an efficient fluorogenic probe to discriminate HSA from other proteins including the bovine serum albumin (BSA). Moreover, YS8/HSA complex could be applied in fluorescence imaging in living cells and is also useful in the study of artificial fluorescent protein (AFP).
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Affiliation(s)
- Yang Luo
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China
| | - Quan-Qi Yu
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China
| | - Juan-Juan Gao
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China
| | - Xue-Xian Lang
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China
| | - Hong-Yao Li
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China
| | - Xiao-Feng Yu
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China
| | - Xue-Yong Qi
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China
| | - Ming-Qi Wang
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China.
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8
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Characterization of Conjugates between α-Lactalbumin and Benzyl Isothiocyanate-Effects on Molecular Structure and Proteolytic Stability. Molecules 2021; 26:molecules26206247. [PMID: 34684828 PMCID: PMC8539348 DOI: 10.3390/molecules26206247] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 10/12/2021] [Accepted: 10/12/2021] [Indexed: 11/27/2022] Open
Abstract
In complex foods, bioactive secondary plant metabolites (SPM) can bind to food proteins. Especially when being covalently bound, such modifications can alter the structure and, thus, the functional and biological properties of the proteins. Additionally, the bioactivity of the SPM can be affected as well. Consequently, knowledge of the influence of chemical modifications on these properties is particularly important for food processing, food safety, and nutritional physiology. As a model, the molecular structure of conjugates between the bioactive metabolite benzyl isothiocyanate (BITC, a hydrolysis product of the glucosinolate glucotropaeolin) and the whey protein α-lactalbumin (α-LA) was investigated using circular dichroism spectroscopy, anilino-1-naphthalenesulfonic acid fluorescence, and dynamic light scattering. Free amino groups were determined before and after the BITC conjugation. Finally, mass spectrometric analysis of the BITC-α-LA protein hydrolysates was performed. As a result of the chemical modifications, a change in the secondary structure of α-LA and an increase in surface hydrophobicity and hydrodynamic radii were documented. BITC modification at the ε-amino group of certain lysine side chains inhibited tryptic hydrolysis. Furthermore, two BITC-modified amino acids were identified, located at two lysine side chains (K32 and K113) in the amino acid sequence of α-LA.
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Prasanthan P, Kishore N. Unusual human serum albumin fibrillation inhibition by ketoprofen and fenoprofen: Mechanistic insights. J Mol Recognit 2021; 34:e2937. [PMID: 34505308 DOI: 10.1002/jmr.2937] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 08/10/2021] [Accepted: 08/21/2021] [Indexed: 11/07/2022]
Abstract
Development of efficient therapeutic strategies to combat protein misfolding and fibrillation is of great clinical significance. In the current study, efforts have been made to obtain qualitative and quantitative insights into interactions of anti-inflammatory drugs; ketoprofen and fenoprofen with the transport protein HSA and their inhibitory action on fibrillation by employing a combination of calorimetric, spectroscopic, microscopic, and molecular docking methods. Interestingly, both ketoprofen and fenoprofen are able to completely inhibit fibrillation of HSA when added at a concentration of 0.5 mM for fenoprofen or 1 mM ketoprofen. Further, no amorphous aggregates are formed. Isothermal titration calorimetric studies highlight the predominant role of polar interactions of these drugs with protein in prevention of fibrillation. The role of conformational flexibility of benzoyl and phenoxy groups of drugs has been correlated with inhibition efficiency. Such studies highlight the role of functionality required for an inhibitor in addressing neurodegenerative diseases.
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Affiliation(s)
- Pooja Prasanthan
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, India
| | - Nand Kishore
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, India
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Akhuli A, Chakraborty D, Agrawal AK, Sarkar M. Probing the Interaction of Bovine Serum Albumin with Copper Nanoclusters: Realization of Binding Pathway Different from Protein Corona. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:1823-1837. [PMID: 33502208 DOI: 10.1021/acs.langmuir.0c03176] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
With an aim to understand the interaction mechanism of bovine serum albumin (BSA) with copper nanoclusters (CuNCs), three different types CuNCs having chemically different surface ligands, namely, tannic acid (TA), chitosan, and cysteine (Cys), have been fabricated, and investigations are carried out in the absence and presence of protein (BSA) at ensemble-averaged and single-molecule levels. The CuNCs, capped with different surface ligands, are consciously chosen so that the role of surface ligands in the overall protein-NCs interactions is clearly understood, but, more importantly, to find whether these CuNCs can interact with protein in a new pathway without forming the "protein corona", which otherwise has been observed in relatively larger nanoparticles when they are exposed to biological fluids. Analysis of the data obtained from fluorescence, ζ-potential, and ITC measurements has clearly indicated that the BSA protein in the presence of CuNCs does not attain the binding stoichiometry (BSA/CuNCs > 1) that is required for the formation of "protein corona". This conclusion is further substantiated by the outcome of the fluorescence correlation spectroscopy (FCS) study. Further analysis of data and thermodynamic calculations have revealed that the surface ligands of the CuNCs play an important role in the protein-NCs binding events, and they can alter the mode and thermodynamics of the process. Specifically, the data have demonstrated that the binding of BSA with TA-CuNCs and Chitosan-CuNCs follows two types of binding modes; however, the same with Cys-CuNCs goes through only one type of binding mode. Circular dichroism (CD) measurements have indicated that the basic structure of BSA remains almost unaltered in the presence of CuNCs. The outcome of the present study is expected to encourage and enable better application of NCs in biological applications.
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Affiliation(s)
- Amit Akhuli
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Bhimpur-Padanpur, Jatni, Khorda, Bhubaneswar 752050, Odisha, India
| | - Debabrata Chakraborty
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Bhimpur-Padanpur, Jatni, Khorda, Bhubaneswar 752050, Odisha, India
| | - Aman Kumar Agrawal
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Bhimpur-Padanpur, Jatni, Khorda, Bhubaneswar 752050, Odisha, India
| | - Moloy Sarkar
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Bhimpur-Padanpur, Jatni, Khorda, Bhubaneswar 752050, Odisha, India
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11
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Nano-Bio Interaction between Blood Plasma Proteins and Water-Soluble Silicon Quantum Dots with Enabled Cellular Uptake and Minimal Cytotoxicity. NANOMATERIALS 2020; 10:nano10112250. [PMID: 33202926 PMCID: PMC7696914 DOI: 10.3390/nano10112250] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 11/11/2020] [Accepted: 11/11/2020] [Indexed: 01/25/2023]
Abstract
A better understanding of the compatibility of water-soluble semiconductor quantum dots (QDs) upon contact with the bloodstream is important for biological applications, including biomarkers working in the first therapeutic spectral window for deep tissue imaging. Herein, we investigated the conformational changes of blood plasma proteins during the interaction with near-infrared light-emitting nanoparticles, consisting of Pluronic F127 shells and cores comprised of assembled silicon QDs terminated with decane monolayers. Albumin and transferrin have high quenching constants and form a hard protein corona on the nanoparticle. In contrast, fibrinogen has low quenching constants and forms a soft protein corona. A circular dichroism (CD) spectrometric study investigates changes in the protein’s secondary and tertiary structures with incremental changes in the nanoparticle concentrations. As expected, the addition of nanoparticles causes the denaturation of the plasma proteins. However, it is noteworthy that the conformational recovery phenomena are observed for fibrinogen and transferrin, suggesting that the nanoparticle does not influence the ordered structure of proteins in the bloodstream. In addition, we observed enabled cellular uptake (NIH3T3 Fibroblasts) and minimal cytotoxicity using different cell lines (HeLa, A549, and NIH3T3). This study offers a basis to design QDs without altering the biomacromolecule’s original conformation with enabled cellular uptake with minimal cytotoxicity.
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Samant V, Dey A, Naresh Patwari G. Probing the interaction between human serum albumin and the sodium dodecyl sulphate with fluorescence correlation spectroscopy. J CHEM SCI 2020. [DOI: 10.1007/s12039-020-01816-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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13
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Dopierała K, Krajewska M, Weiss M. Physicochemical Characterization of Oleanolic Acid-Human Serum Albumin Complexes for Pharmaceutical and Biosensing Applications. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:3611-3623. [PMID: 32176505 DOI: 10.1021/acs.langmuir.0c00087] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Among numerous compounds found in marine organisms, triterpenes have attracted considerable research interest due to a beneficial impact on health including anti-inflammatory, antitumor, antiviral, and antioxidation effects. Specifically, new functionalities of oleanolic acid (OLA) have been revealed recently, indicating possible applications in nutrition and pharmaceuticals. However, this bioactive material has limited value due to low water solubility and stability. Therefore, oleanolic acid needs a carrier that protects it and enables controlled release in the human body. Innovative drug delivery systems provide a promising strategy for overcoming these problems. However, the development of those systems requires a comprehensive understanding of the physicochemical properties of triterpenes and their carriers as well as the interactions between them. Among numerous substances, human serum albumin (HSA) has been widely studied as a drug carrier. In addition, human serum albumin is the main blood plasma protein responsible for the transport of drugs and metabolites; therefore, the interactions between that protein and other substances are of physiological and pharmaceutical importance. Moreover, sensing the HSA level in blood plasma is an important challenge that requires binding studies on a molecular scale. The aim of this study was to investigate the properties of oleanolic acid in the presence of human serum albumin in terms of thermodynamics, morphology, and viscoelasticity at the air/water interface. Moreover, the wettability, surface free energy, and topography of the films after deposition on the solid substrate were determined. The results have been discussed in terms of providing physicochemical insight into the interfacial behavior of the OLA-HSA complex, which is crucial for pharmaceutical and bioanalytical applications.
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Aricov L, Angelescu DG, Băran A, Leontieş AR, Popa VT, Precupaş A, Sandu R, Stîngă G, Anghel DF. Interaction of piroxicam with bovine serum albumin investigated by spectroscopic, calorimetric and computational molecular methods. J Biomol Struct Dyn 2019; 38:2659-2671. [PMID: 31315508 DOI: 10.1080/07391102.2019.1645733] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The binding of drugs to serum proteins is governed by weak non-covalent forces. In this study, the nature and magnitude of the interactions between piroxicam (PRX) and bovine serum albumin (BSA) was assessed using spectroscopic, calorimetric and computational molecular methods. The fluorescence data revealed an atypical behavior during PRX and BSA interaction. The quenching process of tryptophan (Trp) by PRX is a dual one (approximately equal static and dynamic quenched components). The FRET results indicate that a non-radiative transfer of energy occurred. The association constant and the number of binding sites indicate moderate PRX and BSA binding. The competitive binding study indicates that PRX is bound to site I from the hydrophobic pocket of subdomain IIA of BSA. The synchronous spectra showed that the microenvironment around the BSA fluorophores and protein conformation do not change considerably. The Trp lifetimes revealed that PRX mainly quenches the fluorescence of Trp-213 situated in the hydrophobic domain. The CD and DSC investigation show that addition of PRX stabilizes the protein structure. ITC results revealed that BSA-PRX binding involves a combination of electrostatic, hydrophobic and hydrogen interactions. The analysis of the computational data is consistent with the experimental results. This thorough investigation of the PRX-BSA binding may provide support for other studies concerning moderate affinity drugs with serum protein.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Ludmila Aricov
- "Ilie Murgulescu" Institute of Physical Chemistry of the Romanian Academy, Bucharest, Romania
| | - Daniel George Angelescu
- "Ilie Murgulescu" Institute of Physical Chemistry of the Romanian Academy, Bucharest, Romania
| | - Adriana Băran
- "Ilie Murgulescu" Institute of Physical Chemistry of the Romanian Academy, Bucharest, Romania
| | - Anca Ruxandra Leontieş
- "Ilie Murgulescu" Institute of Physical Chemistry of the Romanian Academy, Bucharest, Romania
| | - Vlad Tudor Popa
- "Ilie Murgulescu" Institute of Physical Chemistry of the Romanian Academy, Bucharest, Romania
| | - Aurica Precupaş
- "Ilie Murgulescu" Institute of Physical Chemistry of the Romanian Academy, Bucharest, Romania
| | - Romică Sandu
- "Ilie Murgulescu" Institute of Physical Chemistry of the Romanian Academy, Bucharest, Romania
| | - Gabriela Stîngă
- "Ilie Murgulescu" Institute of Physical Chemistry of the Romanian Academy, Bucharest, Romania
| | - Dan-Florin Anghel
- "Ilie Murgulescu" Institute of Physical Chemistry of the Romanian Academy, Bucharest, Romania
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Pedersen ME, Gad SI, Østergaard J, Jensen H. Protein Characterization in 3D: Size, Folding, and Functional Assessment in a Unified Approach. Anal Chem 2019; 91:4975-4979. [DOI: 10.1021/acs.analchem.9b00537] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Morten E. Pedersen
- FIDA-Tech ApS, Universitetsparken 2 (C/O University of Copenhagen), 2100 Copenhagen, Denmark
| | - Sarah I. Gad
- FIDA-Tech ApS, Universitetsparken 2 (C/O University of Copenhagen), 2100 Copenhagen, Denmark
| | - Jesper Østergaard
- FIDA-Tech ApS, Universitetsparken 2 (C/O University of Copenhagen), 2100 Copenhagen, Denmark
- Department of Pharmacy, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
| | - Henrik Jensen
- FIDA-Tech ApS, Universitetsparken 2 (C/O University of Copenhagen), 2100 Copenhagen, Denmark
- Department of Pharmacy, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
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Kuscuoglu D, Janciauskiene S, Hamesch K, Haybaeck J, Trautwein C, Strnad P. Liver - master and servant of serum proteome. J Hepatol 2018; 69:512-524. [PMID: 29709680 DOI: 10.1016/j.jhep.2018.04.018] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 04/13/2018] [Accepted: 04/16/2018] [Indexed: 12/20/2022]
Abstract
Hepatocytes synthesise the majority of serum proteins. This production occurs in the endoplasmic reticulum (ER) and is adjusted by complex local and systemic regulatory mechanisms. Accordingly, serum levels of hepatocyte-made proteins constitute important biomarkers that reflect both systemic processes and the status of the liver. For example, C-reactive protein is an established marker of inflammatory reaction, whereas transferrin emerges as a liver stress marker and an attractive mortality predictor. The high protein flow through the ER poses a continuous challenge that is handled by a complex proteostatic network consisting of ER folding machinery, ER stress response, ER-associated degradation and autophagy. Various disorders disrupt this delicate balance and result in protein accumulation in the ER. These include chronic hepatitis B infection with overproduction of hepatitis B surface antigen or inherited alpha1-antitrypsin deficiency that give rise to ground glass hepatocytes and alpha1-antitrypsin aggregates, respectively. We review these ER storage disorders and their downstream consequences. The interaction between proteotoxic stress and other ER challenges such as lipotoxicity is also discussed. Collectively, this article aims to sharpen our view of liver hepatocytes as the central hubs of protein metabolism.
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Affiliation(s)
- Deniz Kuscuoglu
- Medical Clinic III, Gastroenterology, Metabolic Diseases and Intensive Care, University Hospital RWTH Aachen, Aachen, Germany; The Interdisciplinary Center for Clinical Research (IZKF), University Hospital Aachen, Aachen, Germany
| | - Sabina Janciauskiene
- Department of Respiratory Medicine, Hannover Medical School, BREATH, German Center for Lung Research (DZL), Hannover, Germany
| | - Karim Hamesch
- Medical Clinic III, Gastroenterology, Metabolic Diseases and Intensive Care, University Hospital RWTH Aachen, Aachen, Germany
| | - Johannes Haybaeck
- Institute of Pathology, Medical University Graz, Graz, Austria; Department of Pathology, Medical Faculty, Otto-von-Guericke University of Magdeburg, Magdeburg, Germany
| | - Christian Trautwein
- Medical Clinic III, Gastroenterology, Metabolic Diseases and Intensive Care, University Hospital RWTH Aachen, Aachen, Germany
| | - Pavel Strnad
- Medical Clinic III, Gastroenterology, Metabolic Diseases and Intensive Care, University Hospital RWTH Aachen, Aachen, Germany; The Interdisciplinary Center for Clinical Research (IZKF), University Hospital Aachen, Aachen, Germany.
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Siaw HMH, Raghunath G, Dyer RB. Peripheral Protein Unfolding Drives Membrane Bending. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:8400-8407. [PMID: 29925237 PMCID: PMC6069603 DOI: 10.1021/acs.langmuir.8b01136] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Dynamic modulation of lipid membrane curvature can be achieved by a number of peripheral protein binding mechanisms such as hydrophobic insertion of amphipathic helices and membrane scaffolding. Recently, an alternative mechanism was proposed in which crowding of peripherally bound proteins induces membrane curvature through steric pressure generated by lateral collisions. This effect was enhanced using intrinsically disordered proteins that possess high hydrodynamic radii, prompting us to explore whether membrane bending can be triggered by the folding-unfolding transition of surface-bound proteins. We utilized histidine-tagged human serum albumin bound to Ni-NTA-DGS containing liposomes as our model system to test this hypothesis. We found that reduction of the disulfide bonds in the protein resulted in unfolding of HSA, which subsequently led to membrane tubule formation. The frequency of tubule formation was found to be significantly higher when the proteins were unfolded while being localized to a phase-separated domain as opposed to randomly distributed in fluid phase liposomes, indicating that the steric pressure generated from protein unfolding can drive membrane deformation. Our results are critical for the design of peripheral membrane protein-immobilization strategies and open new avenues for exploring mechanisms of membrane bending driven by conformational changes of peripheral membrane proteins.
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Sharma A, Chaudhuri TK. Physicochemical characterization of E. coli -derived human serum albumin and its comparison with the human plasma counterpart reveals it as a promising biosimilar. J Biotechnol 2018. [DOI: 10.1016/j.jbiotec.2018.03.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Sulaiman SAJ, Bora T, Abou-Zied OK. Spectroscopic characterization of the warfarin drug-binding site of folded and unfolded human serum albumin anchored on gold nanoparticles: effect of bioconjugation on the loading capacity. RSC Adv 2018; 8:7523-7532. [PMID: 35539131 PMCID: PMC9078392 DOI: 10.1039/c8ra00006a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2018] [Accepted: 02/09/2018] [Indexed: 12/02/2022] Open
Abstract
Protein-conjugated gold nanoparticles (AuNPs) have recently shown promising applications in medicine, owing to their inertness and biocompatibility. Herein, we studied the spectroscopy of 25 nm diameter AuNPs, coated with human serum albumin (HSA) as a model drug carrier. The morphology and coating of the AuNPs were examined using transmission electron microscopy and dynamic light scattering. Resonance energy transfer from the sole tryptophan of HSA (Trp214) to the AuNPs indicates a single layer of protein coverage. Using fluorescein (FL) to probe the warfarin drug-binding site in HSA revealed an increase in the HSA–FL binding by ∼4.5 times when HSA is anchored on the nanoparticle surface, indicating a rise in the loading capacity. Femtosecond transient absorption measurements of the surface plasmonic resonance band of the AuNPs show three ultrafast dynamics that are involved in the relaxation process. The three decay components were assigned to the electron–electron (∼400 fs), electron–phonon (∼2.0 ps) and phonon–phonon (200–250 ps) interactions. These dynamics were not changed upon coating the AuNPs with HSA which indicates the chemical and physical stability of the AuNPs upon bioconjugation. Chemical unfolding of the warfarin binding site with guanidine hydrochloride (GdnHCl) was studied by measuring the spectral shift in the Trp214 fluorescence and the appearance of the Tyr fluorescence. Unfolding was shown to start at [GdnHCl] ≥ 2.0 M and is complete at [GdnHCl] = 6.0 M. HSA anchored onto the nanoparticle surface shows more resistance to the unfolding effect which is attributed to the stability of the native form of HSA on the nanoparticle surface. On the other hand, upon complete unfolding, a larger red shift in the Trp214 fluorescence was observed for the HSA–AuNP complex. This observation indicates that, upon unfolding, the HSA molecule is still anchored on the AuNP surface in which subdomain IIA is facing the outer water molecules in the bulk solution as well as the hydration shell rather than the core of the nanoparticle. The current study is important for a better understanding of the physical and dynamical properties of protein-coated metal nanoparticles, which is expected to help in optimizing their properties for critical applications in nanomedicine. This work investigates the steady-state and ultrafast spectroscopy of bioconjugated gold nanoparticles and the implications on the protein binding activity and drug-loading capacity.![]()
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Affiliation(s)
- Saba A. J. Sulaiman
- Department of Chemistry
- Faculty of Science
- Sultan Qaboos University
- Muscat
- Sultanate of Oman
| | - Tanujjal Bora
- Nanotechnology Research Center
- Sultan Qaboos University
- Muscat
- Sultanate of Oman
| | - Osama K. Abou-Zied
- Department of Chemistry
- Faculty of Science
- Sultan Qaboos University
- Muscat
- Sultanate of Oman
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Sharma A, Chaudhuri TK. Revisiting Escherichia coli as microbial factory for enhanced production of human serum albumin. Microb Cell Fact 2017; 16:173. [PMID: 28982367 PMCID: PMC5629808 DOI: 10.1186/s12934-017-0784-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Accepted: 09/26/2017] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Human serum albumin (HSA)-one of the most demanded therapeutic proteins with immense biotechnological applications-is a large multidomain protein containing 17 disulfide bonds. The current source of HSA is human blood plasma which is a limited and unsafe source. Thus, there exists an indispensable need to promote non-animal derived recombinant HSA (rHSA) production. Escherichia coli is one of the most convenient hosts which had contributed to the production of more than 30% of the FDA approved recombinant pharmaceuticals. It grows rapidly and reaches high cell density using inexpensive and simple subst-rates. E. coli derived recombinant products have more economic potential as fermentation processes are cheaper compared to the other expression hosts. The major bottleneck in exploiting E. coli as a host for a disulfide-rich multidomain protein is the formation of aggregates of overexpressed protein. The majority of the expressed HSA forms inclusion bodies (more than 90% of the total expressed rHSA) in the E. coli cytosol. Recovery of functional rHSA from inclusion bodies is not preferred because it is difficult to obtain a large multidomain disulfide bond rich protein like rHSA in its functional native form. Purification is tedious, time-consuming, laborious and expensive. Because of such limitations, the E. coli host system was neglected for rHSA production for the past few decades despite its numerous advantages. RESULTS In the present work, we have exploited the capabilities of E. coli as a host for the enhanced functional production of rHSA (~ 60% of the total expressed rHSA in the soluble fraction). Parameters like intracellular environment, temperature, induction type, duration of induction, cell lysis conditions etc. which play an important role in enhancing the level of production of the desired protein in its native form in vivo have been optimized. We have studied the effect of assistance of different types of exogenously employed chaperone systems on the functional expression of rHSA in the E. coli host system. Different aspects of cell growth parameters during the production of rHSA in presence and absence of molecular chaperones in E. coli have also been studied. CONCLUSION In the present case, we have filled in the gap in the literature by exploiting the E. coli host system, which is fast-growing and scalable at the low cost of fermentation, as a microbial factory for the enhancement of functional production of rHSA, a crucial protein for therapeutic and biotechnological applications.
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Affiliation(s)
- Ashima Sharma
- Kusuma School of Biological Sciences, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - Tapan K Chaudhuri
- Kusuma School of Biological Sciences, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India.
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Liu C, Yang W, Du J, Shen P, Yang C. A Boron 2-(2′-pyridyl) Imidazole Fluorescence Probe for Bovine Serum Albumin: Discrimination over Other Proteins and Identification of Its Denaturation. Photochem Photobiol 2017; 93:1414-1422. [DOI: 10.1111/php.12789] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2017] [Accepted: 04/12/2017] [Indexed: 12/27/2022]
Affiliation(s)
- Chunlin Liu
- College of Biological and Pharmaceutical Science; China Three Gorges University; Yichang China
| | - Wei Yang
- College of Biological and Pharmaceutical Science; China Three Gorges University; Yichang China
| | - Jinya Du
- College of Biological and Pharmaceutical Science; China Three Gorges University; Yichang China
| | - Ping Shen
- College of Biological and Pharmaceutical Science; China Three Gorges University; Yichang China
| | - Changying Yang
- College of Biological and Pharmaceutical Science; China Three Gorges University; Yichang China
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Sengupta B, Das N, Sen P. Elucidation of μs dynamics of domain-III of human serum albumin during the chemical and thermal unfolding: A fluorescence correlation spectroscopic investigation. Biophys Chem 2017; 221:17-25. [DOI: 10.1016/j.bpc.2016.11.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Revised: 11/09/2016] [Accepted: 11/16/2016] [Indexed: 11/17/2022]
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Stirpe A, Pantusa M, Rizzuti B, De Santo MP, Sportelli L, Bartucci R, Guzzi R. Resveratrol induces thermal stabilization of human serum albumin and modulates the early aggregation stage. Int J Biol Macromol 2016; 92:1049-1056. [DOI: 10.1016/j.ijbiomac.2016.08.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Revised: 08/03/2016] [Accepted: 08/06/2016] [Indexed: 10/21/2022]
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Biswas S, Chowdhury PK. Correlated and Anticorrelated Domain Movement of Human Serum Albumin: A Peek into the Complexity of the Crowded Milieu. J Phys Chem B 2016; 120:4897-911. [DOI: 10.1021/acs.jpcb.6b01671] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Saikat Biswas
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Pramit Kumar Chowdhury
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
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Influence of the methyl position on the binding of 5-epi-taiwaniaquinone G to HSA investigated by spectrofluorimetry and molecular modeling. Med Chem Res 2016. [DOI: 10.1007/s00044-016-1547-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Anand U, Ray S, Ghosh S, Banerjee R, Mukherjee S. Structural aspects of a protein-surfactant assembly: native and reduced States of human serum albumin. Protein J 2016; 34:147-57. [PMID: 25821118 DOI: 10.1007/s10930-015-9606-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The inherently present seventeen disulfide bonds of the circulatory protein, human serum albumin (HSA) provide the necessary structural stability. Various spectroscopic approaches were used to investigate the effect of reduction of these disulfide bonds and its binding with the anionic surfactant, sodium dodecyl sulfate (SDS). Based on several spectroscopic analyses, our investigations highlight the following interesting aspects: (1) HSA on reduction loses not only its tertiary structure but also a significant amount of secondary structure as well. However, the reduced state of the protein is not like the molten-globule, (2) this structural loss of the protein due to reduction is more prominent than that caused by higher SDS concentrations alone and can certainly be attributed to the role of disulfide bonds, (3) lower surfactant concentrations provide marginal structural rigidity to the native state of the protein, whereas, higher concentrations of SDS induces secondary structure to the reduced state of HSA, (4) the binding of SDS with both the native and reduced states of HSA, occurred in three distinct stages which was followed by a saturation stage. However, the nature of such binding is different for both the states as investigated by using the Stern-Volmer equations and estimating the thermodynamic parameters. Besides, in contrast to the native state, the reduced state of HSA shows that the lone tryptophan residue gets more buried. However, there occurs a sudden decrement in the lifetime of the tryptophan and the hydrodynamic diameter increases by twofold.
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Affiliation(s)
- Uttam Anand
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, ITI Campus (Gas Rahat) Building, Govindpura, Bhopal, 462 023, Madhya Pradesh, India
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Das NK, Pawar L, Kumar N, Mukherjee S. Quenching interaction of BSA with DTAB is dynamic in nature: A spectroscopic insight. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.06.033] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Groza RC, Li B, Ryder AG. Anisotropy resolved multidimensional emission spectroscopy (ARMES): A new tool for protein analysis. Anal Chim Acta 2015; 886:133-42. [PMID: 26320645 DOI: 10.1016/j.aca.2015.06.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Revised: 06/02/2015] [Accepted: 06/04/2015] [Indexed: 01/23/2023]
Abstract
Structural analysis of proteins using the emission of intrinsic fluorophores is complicated by spectral overlap. Anisotropy resolved multidimensional emission spectroscopy (ARMES) overcame the overlap problem by the use of anisotropy, with chemometric analysis, to better resolve emission from different fluorophores. Total synchronous fluorescence scan (TSFS) provided information about all the fluorophores that contributed to emission while anisotropy provided information about the environment of each fluorophore. Here the utility of ARMES was demonstrated via study of the chemical and thermal denaturation of human serum albumin (HSA). Multivariate curve resolution (MCR) analysis of the constituent polarized emission ARMES data resolved contributions from four emitters: fluorescence from tryptophan (Trp), solvent exposed tyrosine (Tyr), Tyr in a hydrophobic environment, and room temperature phosphorescence (RTP) from Trp. The MCR scores, anisotropy, and literature validated these assignments and showed all the expected transitions during HSA unfolding. This new methodology for comprehensive intrinsic fluorescence analysis of proteins is applicable to any protein containing multiple fluorophores.
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Affiliation(s)
- Radu Constantin Groza
- Nanoscale Biophotonics Laboratory, School of Chemistry, National University of Ireland, Galway, Galway, Ireland
| | - Boyan Li
- Nanoscale Biophotonics Laboratory, School of Chemistry, National University of Ireland, Galway, Galway, Ireland
| | - Alan G Ryder
- Nanoscale Biophotonics Laboratory, School of Chemistry, National University of Ireland, Galway, Galway, Ireland.
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Garg DK, Tomar R, Dhoke RR, Srivastava A, Kundu B. Domains of Pyrococcus furiosus l-asparaginase fold sequentially and assemble through strong intersubunit associative forces. Extremophiles 2015; 19:681-91. [DOI: 10.1007/s00792-015-0748-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Accepted: 03/29/2015] [Indexed: 11/29/2022]
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Thermal induced unfolding of human serum albumin isomers: Assigning residual α helices to domain II. Int J Biol Macromol 2015; 75:447-52. [DOI: 10.1016/j.ijbiomac.2015.02.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 02/02/2015] [Accepted: 02/04/2015] [Indexed: 11/23/2022]
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Biswas S, Chowdhury PK. Unusual domain movement in a multidomain protein in the presence of macromolecular crowders. Phys Chem Chem Phys 2015; 17:19820-33. [DOI: 10.1039/c5cp02674a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
FRET-based distance changes between domains I and II of HSA reveal significant differences in the manner in which dextran based macromolecular crowding agents influence the serum protein.
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Affiliation(s)
- Saikat Biswas
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
| | - Pramit K. Chowdhury
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
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Gospodarek AM, Sun W, O’Connell JP, Fernandez EJ. Structures of multidomain proteins adsorbed on hydrophobic interaction chromatography surfaces. J Chromatogr A 2014; 1371:204-19. [DOI: 10.1016/j.chroma.2014.10.080] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Revised: 10/08/2014] [Accepted: 10/25/2014] [Indexed: 11/17/2022]
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Parkinson E, Boyd P, Aleksic M, Cubberley R, O'Connor D, Skipp P. Stable isotope labeling method for the investigation of protein haptenation by electrophilic skin sensitizers. Toxicol Sci 2014; 142:239-49. [PMID: 25145658 DOI: 10.1093/toxsci/kfu168] [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] [Indexed: 11/13/2022] Open
Abstract
The risk of contact sensitization is a major consideration in the development of new formulations for personal care products. However, developing a mechanistic approach for non-animal risk assessment requires further understanding of haptenation of skin proteins by sensitizing chemicals, which is the molecular initiating event causative of skin sensitization. The non-stoichiometric nature of protein haptenation results in relatively low levels of modification, often of low abundant proteins, presenting a major challenge for their assignment in complex biological matrices such as skin. Instrumental advances over the last few years have led to a considerable increase in sensitivity of mass spectrometry (MS) techniques. We have combined these advancements with a novel dual-labeling/LC-MS(E) approach to provide an in-depth direct comparison of human serum albumin (HSA), 2,4-dinitro-1-chlorobenzene (DNCB), 5-chloro-2-methyl-4-isothiazolin-3-one (MCI), trans-cinnamaldehyde, and 6-methyl coumarin. These data have revealed novel insights into the differences in protein haptenation between sensitizers with different reaction mechanisms and sensitizing potency; the extreme sensitizers DNCB and MCI were shown to modify a greater number of nucleophilic sites than the moderate sensitizer cinnamaldehyde; and the weak/non-sensitizer 6-methyl coumarin was restricted to only a single nucleophilic residue within HSA. The evaluation of this dual labeling/LC-MS(E) approach using HSA as a model protein has also demonstrated that this strategy could be applied to studying global haptenation in complex mixtures of skin-related proteins by different chemicals.
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Affiliation(s)
- Erika Parkinson
- Centre for Biological Sciences, University of Southampton, Southampton, SO17 1BJ, UK Centre for Proteomic Research, Institute for Life Sciences, University of Southampton, Southampton, SO17 1BJ, UK
| | - Pete Boyd
- Centre for Biological Sciences, University of Southampton, Southampton, SO17 1BJ, UK Centre for Proteomic Research, Institute for Life Sciences, University of Southampton, Southampton, SO17 1BJ, UK
| | - Maja Aleksic
- Safety and Environmental Assurance Centre, Unilever, Colworth Science Park, Sharnbrook, MK44 1LQ, UK
| | - Richard Cubberley
- Safety and Environmental Assurance Centre, Unilever, Colworth Science Park, Sharnbrook, MK44 1LQ, UK
| | - David O'Connor
- Department of Biological Sciences, Xi'an Jiaotong-Liverpool University, SIP Suzhou, Jiangsu Province 215123, China
| | - Paul Skipp
- Centre for Biological Sciences, University of Southampton, Southampton, SO17 1BJ, UK Centre for Proteomic Research, Institute for Life Sciences, University of Southampton, Southampton, SO17 1BJ, UK
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34
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Das NK, Ghosh N, Kale AP, Mondal R, Anand U, Ghosh S, Tiwari VK, Kapur M, Mukherjee S. Temperature Induced Morphological Transitions from Native to Unfolded Aggregated States of Human Serum Albumin. J Phys Chem B 2014; 118:7267-76. [DOI: 10.1021/jp5030944] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nirmal Kumar Das
- Department of Chemistry,
Indian Institute of Science Education and Research Bhopal Indore By-Pass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
| | - Narayani Ghosh
- Department of Chemistry,
Indian Institute of Science Education and Research Bhopal Indore By-Pass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
| | - Ajit Prabhakar Kale
- Department of Chemistry,
Indian Institute of Science Education and Research Bhopal Indore By-Pass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
| | - Ramakanta Mondal
- Department of Chemistry,
Indian Institute of Science Education and Research Bhopal Indore By-Pass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
| | - Uttam Anand
- Department of Chemistry,
Indian Institute of Science Education and Research Bhopal Indore By-Pass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
| | - Subhadip Ghosh
- Department of Chemistry,
Indian Institute of Science Education and Research Bhopal Indore By-Pass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
| | - Virendra Kumar Tiwari
- Department of Chemistry,
Indian Institute of Science Education and Research Bhopal Indore By-Pass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
| | - Manmohan Kapur
- Department of Chemistry,
Indian Institute of Science Education and Research Bhopal Indore By-Pass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
| | - Saptarshi Mukherjee
- Department of Chemistry,
Indian Institute of Science Education and Research Bhopal Indore By-Pass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
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35
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Ghosh S, Chakrabarty S, Bhowmik D, Kumar GS, Chattopadhyay N. Stepwise Unfolding of Bovine and Human Serum Albumin by an Anionic Surfactant: An Investigation Using the Proton Transfer Probe Norharmane. J Phys Chem B 2014; 119:2090-102. [DOI: 10.1021/jp501150p] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Saptarshi Ghosh
- Department
of Chemistry, Jadavpur University, Kolkata 700 032, India
| | | | - Debipreeta Bhowmik
- Biophysical
Chemistry Laboratory, Chemistry Division, CSIR-Indian Institute of Chemical Biology, Kolkata 700 032, India
| | - Gopinatha Suresh Kumar
- Biophysical
Chemistry Laboratory, Chemistry Division, CSIR-Indian Institute of Chemical Biology, Kolkata 700 032, India
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36
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Banerjee R, Gupta S, Dey D, Maiti S, Dhara D. Synthesis of PEG containing cationic block copolymers and their interaction with human serum albumin. REACT FUNCT POLYM 2014. [DOI: 10.1016/j.reactfunctpolym.2013.11.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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37
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Khan JM, Chaturvedi SK, Khan RH. Elucidating the mode of action of urea on mammalian serum albumins and protective effect of sodium dodecyl sulfate. Biochem Biophys Res Commun 2013; 441:681-8. [DOI: 10.1016/j.bbrc.2013.10.055] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Accepted: 10/11/2013] [Indexed: 11/30/2022]
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38
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Yadav R, Sen P. Mechanistic investigation of domain specific unfolding of human serum albumin and the effect of sucrose. Protein Sci 2013; 22:1571-81. [PMID: 24038622 DOI: 10.1002/pro.2357] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Revised: 07/27/2013] [Accepted: 08/16/2013] [Indexed: 11/07/2022]
Abstract
This study is devoted to understand the unfolding mechanism of a multidomain protein, human serum albumin (HSA), in absence and presence of the sucrose by steady-state and time-resolved fluorescence spectroscopy with domain specific marker molecules and is further being substantiated by molecular dynamics (MD) simulation. In water, the domain III of HSA found to unfold first followed by domains I and II as the concentration of GnHCl is increased in the medium. The sequential unfolding behavior of different domains of HSA remains same in presence of sucrose; however, a higher GnHCl concentration is required for unfolding, suggesting stabilizing effect of sucrose on HSA. Domain I is found to be most stabilized by sucrose. The stabilization of domain II is somewhat similar to domain I, but the effect of sucrose on domain III is found to be very small. MD simulation also predicted a similar behavior of sucrose on HSA. The stabilizing effect of sucrose is explained in terms of the entrapment of water molecules in between HSA surface and sucrose layer as well as direct interaction between HSA and sucrose.
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Affiliation(s)
- Rajeev Yadav
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208 016, Uttar Pradesh, India
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39
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Binding, unfolding and refolding dynamics of serum albumins. Biochim Biophys Acta Gen Subj 2013; 1830:5394-404. [PMID: 23707713 DOI: 10.1016/j.bbagen.2013.05.017] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 05/08/2013] [Accepted: 05/13/2013] [Indexed: 10/26/2022]
Abstract
BACKGROUND The serum albumins (human and bovine serum albumin) occupy a seminal position among all proteins investigated until today as they are the most abundant circulatory proteins. They play the major role of a transporter of many bio-active substances which include various fatty acids, drug molecules, and amino acids to the target cells. Hence, studying the interaction of these serum albumins with different binding agents has attracted enormous research interests from decades. The nature and magnitude of these bindings have direct consequence on drug delivery, pharmacokinetics, therapeutic efficacy and drug design and control. SCOPE OF THE REVIEW In the present review, we summarize the binding characteristics of both the serum albumins with surfactants, lipids and vesicles, polymers and dendrimers, nanomaterials and drugs. Finally we have reviewed the effect of various chemical and physical denaturants on these albumins with a special emphasis on protein unfolding and refolding dynamics. MAJOR CONCLUSIONS The topic of binding and dynamics of protein unfolding and refolding spans across all areas of inter-disciplinary sciences and will benefit clinical toxicology and medicines. The extensive data from several contemporary research based on albumins will help us to understand protein dynamics in a more illustrious manner. GENERAL SIGNIFICANCE These data have immense significance in understanding and unravelling the mechanisms of protein unfolding/refolding and thus can pave the way to prevent protein mis-folding/aggregation which sometimes leads to severe consequences like Parkinson's and Alzheimer's diseases. This article is a part of a Special Issue entitled Serum Albumin. This article is part of a Special Issue entitled Serum Albumin.
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40
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Anand U, Mukherjee S. Reversibility in protein folding: effect of β-cyclodextrin on bovine serum albumin unfolded by sodium dodecyl sulphate. Phys Chem Chem Phys 2013; 15:9375-83. [DOI: 10.1039/c3cp50207d] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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Paul BK, Bhattacharjee K, Bose S, Guchhait N. A spectroscopic investigation on the interaction of a magnetic ferrofluid with a model plasma protein: effect on the conformation and activity of the protein. Phys Chem Chem Phys 2012; 14:15482-93. [PMID: 23073212 DOI: 10.1039/c2cp42415k] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The understanding of the interaction of nanomaterials with relevant biological targets e.g., proteins is of paramount importance in biological and pharmaceutical fields of research. In a biological fluid, proteins can associate with nanomaterials which can subsequently exert a significant impact on the conformation and functionality of the protein. Here we report the binding interaction of a model plasma protein Bovine Serum Albumin (BSA) with a magnetic nanoparticle of mixed spinel origin (Ni(0.5)Zn(0.5)Fe(2)O(4), abbreviated as NZFO from now and onwards). The thermodynamic parameters (ΔH, ΔS and ΔG) for the protein-nanoparticle binding interaction have been evaluated from the van't Hoff equation to unveil that the binding interaction is enthalpically as well as entropically driven (ΔH < 0 and ΔS > 0), with an overall favorable Gibbs free energy change (ΔG < 0). Also the thermodynamic parameters delineate the predominant role of electrostatic interaction in the BSA-NZFO binding process. The results of temperature dependent fluorescence quenching and time-resolved fluorescence decay measurements indicate a static quenching mechanism in the present case. Steady-state absorption, synchronous fluorescence, three-dimensional (3D) fluorescence and circular dichroism (CD) spectroscopic techniques have been employed to unveil the conformational changes in BSA induced by the binding of NZFO. Disruption of the native conformation of the protein upon binding with NZFO is reflected through a reduced functionality (in terms of esterase activity) of the protein-NZFO conjugate system in comparison to the native protein. Based on the experimental findings the probable binding location of NZFO is argued to be the hydrophilic domain IB. This seems physically realizable since domain I of BSA is characterized by a net negative charge and hence can serve as a favorable binding site for NZFO carrying a positive surface charge. The key role of electrostatic forces in the BSA-NZFO interaction process is further substantiated from chemical denaturation study and measurement of the effect of ionic strength on the interaction process.
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Affiliation(s)
- Bijan Kumar Paul
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Calcutta 700009, India
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42
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Banerjee M, Pal U, Subudhhi A, Chakrabarti A, Basu S. Interaction of Merocyanine 540 with serum albumins: Photophysical and binding studies. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2012; 108:23-33. [DOI: 10.1016/j.jphotobiol.2011.12.005] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Revised: 12/14/2011] [Accepted: 12/15/2011] [Indexed: 10/14/2022]
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43
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Li S, Li D. Investigation on the pH-dependent binding of benzocaine and lysozyme by fluorescence and absorbance. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 82:396-405. [PMID: 21820949 DOI: 10.1016/j.saa.2011.07.069] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2011] [Revised: 07/18/2011] [Accepted: 07/19/2011] [Indexed: 05/10/2023]
Abstract
The interaction mechanism between benzocaine (BZC) and lysozyme (Lys) has been investigated by fluorescence, synchronous fluorescence, ultraviolet-vis (UV) absorption spectra, and three-dimensional fluorescence (3-D) in various pH medium. The observations of fluorescence spectra were mainly rationalized in terms of a static quenching process at lower concentration of BZC (C(BZC)/C(Lys)<9) and a combined quenching process at higher concentration of BZC (C(BZC)/C(Lys)>9) at pH 7.4 and 8.4. However, the fluorescence quenching was mainly arisen from static quenching by complex formation in all studied drug concentrations at pH 3.5. The structural characteristics of BZC and Lys were probed, and their binding affinities were determined under different pH conditions (pH 3.5, 7.4, and 8.4). The results indicated that the binding abilities of BZC to Lys decreased at the pH below and above the simulative physiological condition (pH 7.4) due to the alterations of the protein secondary and tertiary structures or the structural change of BZC. The effect of BZC on the conformation of Lys was analyzed using UV, synchronous fluorescence and three-dimensional fluorescence under different pH conditions. These results indicate that the binding of BZC to Lys causes apparent change in the secondary and tertiary structures of Lys. The effect of Zn(2+) on the binding constant of BZC with Lys under various pH conditions (pH 3.5, 7.4, and 8.4) was also studied.
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Affiliation(s)
- Shihui Li
- College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471022, China
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44
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Anand U, Jash C, Mukherjee S. Protein unfolding and subsequent refolding: a spectroscopic investigation. Phys Chem Chem Phys 2011; 13:20418-26. [PMID: 21993230 DOI: 10.1039/c1cp21759c] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The mechanism by which the protein Bovine Serum Albumin (BSA) undergoes unfolding induced by Guanidine Hydrochloride (GdHCl) and then the subsequent refolding brought in by many-fold dilution was studied by steady-state fluorescence, anisotropy, time resolved measurements and Circular Dichroism (CD) spectroscopy. CD data reveal that the protein attains a degree of extra rigidity at low concentrations of the denaturant, GdHCl, and this observation was correlated with other techniques used in this present work. The unfolding and refolding of BSA appear to proceed through intermediates and both the processes are sequential in nature. The intrinsic fluorescence from the tryptophan amino acid residue of BSA and another external fluorophore Nile Red was made use of in order to investigate the mechanisms of unfolding and refolding and we have conclusively proved that both these processes follow a reversible mechanism.
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Affiliation(s)
- Uttam Anand
- Department of Chemical Sciences, Indian Institute of Science Education and Research Bhopal, ITI Campus (Gas Rahat) Building, Govindpura, Bhopal 462 023, Madhya Pradesh, India
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45
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Zhang H, Tang B, Wang Y, Zhang D, Zhang H. Studies of the Interaction Between Ciprofloxacin and the Hemocyanin From Chinese Mitten Crab Eriocheir Japonica Sinensis. ANAL LETT 2011. [DOI: 10.1080/00032719.2010.546020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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46
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Gospodarek AM, Smatlak ME, O'Connell JP, Fernandez EJ. Protein stability and structure in HIC: hydrogen exchange experiments and COREX calculations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:286-295. [PMID: 21117672 DOI: 10.1021/la103793r] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Hydrogen exchange mass spectrometry (HXMS) coupled to proteolytic digestion has been used to probe the conformation of bovine β-lactoglobulin (BLG), bovine α-lactalbumin (BLA), and human serum albumin (HSA) in solution and while adsorbed to the hydrophobic interaction chromatography media Phenyl Sepharose 6FF. All three proteins show evidence of EX1 exchange kinetics, indicating a loss of stability on the surface. HX protection patterns for all three proteins also indicate that the unfolded form is only partially solvent exposed. The hydrogen-deuterium exchange patterns of BLG and BLA on the surface suggest a structure that resembles each protein's respective solution phase molten globule state. The low stability of Domain II of HSA observed on Phenyl Sepharose 6FF also suggests a link to solution stability because Domain II is frequently cited as the least stable domain in solution unfolding pathways. COREX, an algorithm used to compute protein folding stabilities, correctly predicts solution hydrogen-deuterium exchange patterns for BLG and offers insight into its adsorbed phase stabilities but is unreliable for BLA predictions. The results of this work demonstrate a link between solution-phase local stability patterns and the nature of partially unfolded states that proteins can adopt on HIC surfaces.
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Affiliation(s)
- Adrian M Gospodarek
- Department of Chemical Engineering, University of Virginia, Charlottesville, Virginia 22904-4741, United States
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47
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Anand U, Jash C, Mukherjee S. Spectroscopic probing of the microenvironment in a protein-surfactant assembly. J Phys Chem B 2010; 114:15839-45. [PMID: 21077590 DOI: 10.1021/jp106703h] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The effect of the anionic surfactant sodium dodecyl sulfate (SDS) on the protein human serum albumin (HSA) was studied using steady-state spectroscopy, time-resolved measurements, and circular dichroism spectroscopy. The binding of SDS to the domain IIA of HSA, housing the single tryptophan amino acid residue (Trp214), was monitored, and it was found that this addition of the surfactant takes place in a sequential manner depending upon the concentration of the added surfactant. Both fluorescence intensity and lifetimes of HSA decreased with the increasing concentration of SDS, and the surfactant molecules serve the role of a quencher for the fluorescence of Trp214. Circular dichroism data also support the structural changes induced by SDS. The 17 disulfide bridges present in HSA provide the necessary structural rigidity to the protein. Stern-Volmer plots and thermodynamic parameters have been used to characterize the sequential binding of SDS to HSA, and these parameters not only confirm that the binding is spontaneous in nature but also is quite strong, depending on the concentration of the added surfactant.
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Affiliation(s)
- Uttam Anand
- Department of Chemical Sciences, Indian Institute of Science Education and Research Bhopal, ITI Campus (Gas Rahat) Building, Govindpura, Bhopal 462 023, Madhya Pradesh, India
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48
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Paul BK, Samanta A, Guchhait N. Exploring Hydrophobic Subdomain IIA of the Protein Bovine Serum Albumin in the Native, Intermediate, Unfolded, and Refolded States by a Small Fluorescence Molecular Reporter. J Phys Chem B 2010; 114:6183-96. [DOI: 10.1021/jp100004t] [Citation(s) in RCA: 167] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Bijan Kumar Paul
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Calcutta 700009, India
| | - Anuva Samanta
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Calcutta 700009, India
| | - Nikhil Guchhait
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Calcutta 700009, India
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49
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Galantini L, Leggio C, Konarev PV, Pavel NV. Human serum albumin binding ibuprofen: A 3D description of the unfolding pathway in urea. Biophys Chem 2010; 147:111-22. [DOI: 10.1016/j.bpc.2010.01.002] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2009] [Revised: 01/08/2010] [Accepted: 01/10/2010] [Indexed: 11/28/2022]
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50
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Characterization of different conformations of bovine serum albumin and their propensity to aggregate in the presence of N-cetyl-N,N,N-trimethyl ammonium bromide. J Colloid Interface Sci 2010; 343:454-62. [DOI: 10.1016/j.jcis.2009.12.012] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2009] [Revised: 11/27/2009] [Accepted: 12/02/2009] [Indexed: 11/18/2022]
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