1
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Sozarukova MM, Kochneva EM, Proskurnina EV, Mikheev IV, Novikov DO, Proskurnin MA, Ivanov VK. Albumin Retains Its Transport Function after Interaction with Cerium Dioxide Nanoparticles. ACS Biomater Sci Eng 2023; 9:6759-6772. [PMID: 37955421 DOI: 10.1021/acsbiomaterials.3c01416] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2023]
Abstract
The interaction of inorganic nanomaterials with biological fluids containing proteins can lead not only to the formation of a protein corona and thereby to a change in the biological activity of nanoparticles but also to a significant effect on the structural and functional properties of the biomolecules themselves. This work studied the interaction of nanoscale CeO2, the most versatile nanozyme, with human serum albumin (HSA). Fourier transform infrared spectroscopy, MALDI-TOF mass spectrometry, UV-vis spectroscopy, and fluorescence spectroscopy confirmed the formation of HSA-CeO2 nanoparticle conjugates. Changes in protein conformation, which depend on the concentration of both citrate-stabilized CeO2 nanoparticles and pristine CeO2 nanoparticles, did not affect albumin drug-binding sites and, accordingly, did not impair the HSA transport function. The results obtained shed light on the biological consequences of the CeO2 nanoparticles' entrance into the body, which should be taken into account when engineering nanobiomaterials to increase their efficiency and reduce the side effects.
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Affiliation(s)
- Madina M Sozarukova
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky Avenue, 31, Moscow 119991, Russia
| | - Ekaterina M Kochneva
- Analytical Chemistry Division, Chemistry Department, Lomonosov Moscow State University, Leninskie Gory, 1-3, GSP-1, Moscow 119991, Russia
| | - Elena V Proskurnina
- Research Centre for Medical Genetics, Moskvorechye Street, 1, Moscow 115522, Russia
| | - Ivan V Mikheev
- Analytical Chemistry Division, Chemistry Department, Lomonosov Moscow State University, Leninskie Gory, 1-3, GSP-1, Moscow 119991, Russia
| | - Dmitry O Novikov
- Bauman Moscow State Technical University, 2-nd Baumanskaya Street, 5, Moscow 105005, Russia
| | - Mikhail A Proskurnin
- Analytical Chemistry Division, Chemistry Department, Lomonosov Moscow State University, Leninskie Gory, 1-3, GSP-1, Moscow 119991, Russia
| | - Vladimir K Ivanov
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky Avenue, 31, Moscow 119991, Russia
- National Research University Higher School of Economics, Pokrovsky Bulvar, 11, Moscow 109028, Russia
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2
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Kunka A, Lacko D, Stourac J, Damborsky J, Prokop Z, Mazurenko S. CalFitter 2.0: Leveraging the power of singular value decomposition to analyse protein thermostability. Nucleic Acids Res 2022; 50:W145-W151. [PMID: 35580052 PMCID: PMC9252748 DOI: 10.1093/nar/gkac378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 04/20/2022] [Accepted: 05/14/2022] [Indexed: 11/24/2022] Open
Abstract
The importance of the quantitative description of protein unfolding and aggregation for the rational design of stability or understanding the molecular basis of protein misfolding diseases is well established. Protein thermostability is typically assessed by calorimetric or spectroscopic techniques that monitor different complementary signals during unfolding. The CalFitter webserver has already proved integral to deriving invaluable energy parameters by global data analysis. Here, we introduce CalFitter 2.0, which newly incorporates singular value decomposition (SVD) of multi-wavelength spectral datasets into the global fitting pipeline. Processed time- or temperature-evolved SVD components can now be fitted together with other experimental data types. Moreover, deconvoluted basis spectra provide spectral fingerprints of relevant macrostates populated during unfolding, which greatly enriches the information gains of the CalFitter output. The SVD analysis is fully automated in a highly interactive module, providing access to the results to users without any prior knowledge of the underlying mathematics. Additionally, a novel data uploading wizard has been implemented to facilitate rapid and easy uploading of multiple datasets. Together, the newly introduced changes significantly improve the user experience, making this software a unique, robust, and interactive platform for the analysis of protein thermal denaturation data. The webserver is freely accessible at https://loschmidt.chemi.muni.cz/calfitter.
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Affiliation(s)
- Antonin Kunka
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Brno, Czech Republic.,International Centre for Clinical Research, St. Anne's University Hospital Brno, Brno, Czech Republic
| | - David Lacko
- Faculty of Information Technology, Brno University of Technology, Brno, Czech Republic
| | - Jan Stourac
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Brno, Czech Republic.,International Centre for Clinical Research, St. Anne's University Hospital Brno, Brno, Czech Republic
| | - Jiri Damborsky
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Brno, Czech Republic.,International Centre for Clinical Research, St. Anne's University Hospital Brno, Brno, Czech Republic
| | - Zbynek Prokop
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Brno, Czech Republic.,International Centre for Clinical Research, St. Anne's University Hospital Brno, Brno, Czech Republic
| | - Stanislav Mazurenko
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Brno, Czech Republic.,International Centre for Clinical Research, St. Anne's University Hospital Brno, Brno, Czech Republic
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3
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Curcio M, Diaz-Gomez L, Cirillo G, Nicoletta FP, Leggio A, Iemma F. Dual-Targeted Hyaluronic Acid/Albumin Micelle-Like Nanoparticles for the Vectorization of Doxorubicin. Pharmaceutics 2021; 13:pharmaceutics13030304. [PMID: 33652648 PMCID: PMC7996918 DOI: 10.3390/pharmaceutics13030304] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 02/22/2021] [Accepted: 02/23/2021] [Indexed: 12/15/2022] Open
Abstract
Drug targeting of tumor cells is one of the great challenges in cancer therapy; nanoparticles based on natural polymers represent valuable tools to achieve this aim. The ability to respond to environmental signals from the pathological site (e.g., altered redox potential), together with the specific interaction with membrane receptors overexpressed on cancer cells membrane (e.g., CD44 receptors), represent the main features of actively targeted nanoparticles. In this work, redox-responsive micelle-like nanoparticles were prepared by self-assembling of a hyaluronic acid–human serum albumin conjugate containing cystamine moieties acting as a functional spacer. The conjugation procedure consisted of a reductive amination step of hyaluronic acid followed by condensation with albumin. After self-assembling, nanoparticles with a mean size of 70 nm and able to be destabilized in reducing media were obtained. Doxorubicin-loaded nanoparticles modulated drug release rate in response to different redox conditions. Finally, the viability and uptake experiments on healthy (BALB-3T3) and metastatic cancer (MDA-MB-231) cells proved the potential applicability of the proposed system as a drug vector in cancer therapy.
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Affiliation(s)
- Manuela Curcio
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87036 Rende (CS), Italy; (G.C.); (F.P.N.); (A.L.); (F.I.)
- Correspondence: ; Tel.: +39-0984493011
| | - Luis Diaz-Gomez
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, I+D Farma Group, Facultad de Farmacia and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain;
| | - Giuseppe Cirillo
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87036 Rende (CS), Italy; (G.C.); (F.P.N.); (A.L.); (F.I.)
| | - Fiore Pasquale Nicoletta
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87036 Rende (CS), Italy; (G.C.); (F.P.N.); (A.L.); (F.I.)
| | - Antonella Leggio
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87036 Rende (CS), Italy; (G.C.); (F.P.N.); (A.L.); (F.I.)
| | - Francesca Iemma
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87036 Rende (CS), Italy; (G.C.); (F.P.N.); (A.L.); (F.I.)
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4
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Ganorkar K, Mukherjee S, Singh P, Ghosh SK. Stabilization of a potential anticancer thiosemicarbazone derivative in Sudlow site I of human serum albumin: In vitro spectroscopy coupled with molecular dynamics simulation. Biophys Chem 2020; 269:106509. [PMID: 33302053 DOI: 10.1016/j.bpc.2020.106509] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2020] [Revised: 11/19/2020] [Accepted: 11/23/2020] [Indexed: 11/25/2022]
Abstract
Human Serum Albumin (HSA) is the most important protein in human blood plasma and can acts as a major transporting agent for various drug molecules with flexible binding interaction. To elucidate the interaction of a newly designed potential anticancer thiosemicarbazone based luminophore (E)-1-(4-(diethylamino)-2-hydroxybenzylidene)-4,4-dimethyl-thiosemicarbazide (DAHTS) with HSA under physiological condition, in vitro optical spectroscopic experiments viz UV-Vis absorption, steady state fluorescence, fluroscence anisotropy, time resolved fluorscence (TRF) and cicular dichroism (CD) spectroscopy have been scrutinised. The experimental findings have been corroborated with in silico molecular docking analysis and Molecular Dynamics (MD) simulation. The spectroscopic results demonstrated that the conventionally anion-favouring Sudlow site I of HSA copiously adapt neutral DAHTS molecule with moderate binding affinity. The mean fluorescence lifetime of the sole tryptophan (Trp-214) present in the macromolecule experiences an appreciable diminution with an increase in concentration of the synthesized molecule. DAHTS localize itself close to Trp-214 within subdomain IIA (Sudlow site I) and surrounded by multiple hydrophobic amino acid residues (Val-235, Val-231, Ala-229, Phe-228, Val-325, Phe-326, Leu-327, Met-329, Phe-330, Leu-331, Tyr-332, Leu-346, Leu-347, Val-482, Leu-349, Ala-350, Ala-210, Trp-214, Ala- 213 and Val-216) in HSA. The distinct fluorescence lifetime, diverse pathways and changing rate of population indicates that the rotamerisation of Trp-214 residue is controlled by the guest molecule. Sudlow site I of HSA behaves flexibly and induces an allosteric modulation in the macromolecule resulting a minor deformation in the protein secondary structure as observed in CD (observed 11% change of α-helix content) as well as in MD simulation. The integrated multi-spectroscopic research described herein provides several important information about the binding interaction of a thiosemicarbazone Schiff base with HSA, which can be very significant for thiosemicarbazone based drug designing for academia as well as industry.
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Affiliation(s)
- Kapil Ganorkar
- Department of Chemistry, Visvesvaraya National Institute of Technology, Nagpur, Maharashtra 440010, India
| | - Soham Mukherjee
- Department of Chemistry, Visvesvaraya National Institute of Technology, Nagpur, Maharashtra 440010, India; Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14850, USA
| | - Piyush Singh
- Department of Chemistry, Visvesvaraya National Institute of Technology, Nagpur, Maharashtra 440010, India
| | - Sujit Kumar Ghosh
- Department of Chemistry, Visvesvaraya National Institute of Technology, Nagpur, Maharashtra 440010, India.
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5
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Coverdale JPC, Barnett JP, Adamu AH, Griffiths EJ, Stewart AJ, Blindauer CA. A metalloproteomic analysis of interactions between plasma proteins and zinc: elevated fatty acid levels affect zinc distribution. Metallomics 2019; 11:1805-1819. [PMID: 31612889 DOI: 10.1039/c9mt00177h] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Serum albumin is a highly abundant plasma protein associated with the transport of metal ions, pharmaceuticals, fatty acids and a variety of small molecules in the blood. Once thought of as a molecular 'sponge', mounting evidence suggests that the albumin-facilitated transport of chemically diverse entities is not independent. One such example is the transport of Zn2+ ions and non-esterified 'free' fatty acids (FFAs) by albumin, both of which bind at high affinity sites located in close proximity. Our previous research suggests that their transport in blood plasma is linked via an allosteric mechanism on serum albumin. In direct competition, albumin-bound FFAs significantly decrease the binding capacity of albumin for Zn2+, with one of the predicted consequences being a change in plasma/serum zinc speciation. Using liquid chromatography (LC), ICP-MS and fluorescence assays, our work provides a quantitative assessment of this phenomenon, and finds that in the presence of high FFA concentrations encountered in various physiological conditions, a significant proportion of albumin-bound Zn2+ is re-distributed amongst plasma/serum proteins. Using peptide mass fingerprinting and immunodetection, we identify candidate acceptor proteins for Zn2+ liberated from albumin. These include histidine-rich glycoprotein (HRG), a multifunctional protein associated with the regulation of blood coagulation, and members of the complement system involved in the innate immune response. Our findings highlight how FFA-mediated changes in extracellular metal speciation might contribute to the progression of certain pathological conditions.
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Affiliation(s)
| | - James P Barnett
- Department of Life Sciences, Birmingham City University, Edgbaston, B15 3TN, UK
| | - Adamu H Adamu
- Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK.
| | - Ellie J Griffiths
- Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK.
| | - Alan J Stewart
- School of Medicine, University of St Andrews, St Andrews, KY16 9TF, UK
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6
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Khan JM, Ahmed A, Freeh Alamery S, Farah MA, Hussain T, Khan MI, Khan RH, Malik A, Fatima S, Sen P. Millimolar concentration of sodium dodecyl sulfate inhibit thermal aggregation in hen egg white lysozyme via increased α-helicity. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.03.085] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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7
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Mukherjee S, Ganorkar K, Kumar A, Sehra N, Ghosh SK. Switching of Trp-214 intrinsic rotamer population in human serum albumin: An insight into the aftermath of embracing therapeutic bioorganic luminophore azapodophyllotoxin into sudlow site I. Bioorg Chem 2019; 84:63-75. [DOI: 10.1016/j.bioorg.2018.11.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 11/02/2018] [Accepted: 11/13/2018] [Indexed: 01/14/2023]
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8
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Ghosh S, Salama F, Dines M, Lahav A, Adir N. Biophysical and structural characterization of the small heat shock protein HspA from Thermosynechococcus vulcanus in 2 M urea. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2019; 1867:442-452. [PMID: 30711645 DOI: 10.1016/j.bbapap.2018.12.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 11/29/2018] [Accepted: 12/11/2018] [Indexed: 10/27/2022]
Abstract
Small heat shock proteins (sHSPs) belong to the superfamily of molecular chaperones. They prevent aggregation of partially unfolded or misfolded client proteins, providing protection to organisms under stress conditions. Here, we report the biophysical and structural characterization of a small heat shock protein (HspA) from a thermophilic cyanobacterium Thermosynechococcus vulcanus in the presence of 2 M urea. HspA has been shown to be important for the protection of Photosystem II and the Phycobilisome antenna complex at elevated temperatures. Heterologously expressed HspA requires the presence of 1-2 M urea to maintain its solubility at concentrations required for most characterization methods. Spectroscopic studies reveal the presence of the β-sheet structure and intactness of the tertiary fold in HspA. In vitro assays show that the HspA maintains chaperone-like activity in protecting soluble proteins from thermal aggregation. Chromatography and electron microscopy show that the HspA exists as a mixture of oligomeric forms in the presence of 2 M urea. HspA was successfully crystallized only in the presence of 2 M urea. The crystal structure of HspA shows urea-induced loss of about 30% of the secondary structure without major alteration in the tertiary structure of the protein. The electron density maps reveal changes in the hydrogen bonding network which we attribute to the presence of urea. The crystal structure of HspA demonstrates a mixture of both direct interactions between urea and protein functionalities and interactions between urea and the surrounding solvent that indirectly affect the protein, which are in accordance with previously published studies.
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Affiliation(s)
- Sudeshna Ghosh
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Technion City, Haifa 32000, Israel
| | - Faris Salama
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Technion City, Haifa 32000, Israel
| | - Monica Dines
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Technion City, Haifa 32000, Israel
| | - Avital Lahav
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Technion City, Haifa 32000, Israel
| | - Noam Adir
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Technion City, Haifa 32000, Israel.
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9
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Placente D, Benedini LA, Baldini M, Laiuppa JA, Santillán GE, Messina PV. Multi-drug delivery system based on lipid membrane mimetic coated nano-hydroxyapatite formulations. Int J Pharm 2018; 548:559-570. [DOI: 10.1016/j.ijpharm.2018.07.036] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 06/26/2018] [Accepted: 07/13/2018] [Indexed: 10/28/2022]
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10
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The electrostatic embedding contribution to DFT calculations of ligand-amino acid residues interaction. J Mol Model 2018; 24:211. [DOI: 10.1007/s00894-018-3743-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 06/27/2018] [Indexed: 10/28/2022]
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11
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Del Giudice A, Galantini L, Dicko C, Pavel NV. The effect of fatty acid binding in the acid isomerizations of albumin investigated with a continuous acidification method. Colloids Surf B Biointerfaces 2018; 168:109-116. [DOI: 10.1016/j.colsurfb.2018.03.038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 03/21/2018] [Accepted: 03/24/2018] [Indexed: 10/17/2022]
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12
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Guglielmelli A, Rizzuti B, Guzzi R. Stereoselective and domain-specific effects of ibuprofen on the thermal stability of human serum albumin. Eur J Pharm Sci 2017; 112:122-131. [PMID: 29158196 DOI: 10.1016/j.ejps.2017.11.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2017] [Revised: 10/31/2017] [Accepted: 11/16/2017] [Indexed: 12/20/2022]
Abstract
Ibuprofen is one of the most used anti-inflammatory drugs, and it is transported in the blood by human serum albumin, a major plasmatic protein with a peculiar adaptability in the binding of several different ligands. We have characterized the interaction between albumin and ibuprofen, either in racemic mixture, or in the S(+) and R(-) enantiomeric forms, by using differential scanning calorimetry, attenuated total reflectance Fourier transform infrared spectroscopy, and molecular dynamics simulation. The results show that increasing concentrations of ibuprofen (up to sixfold drug/protein molar ratio) improve the protein resistance to thermal unfolding without altering the secondary structure. Deconvolution of the calorimetric thermal profiles at different albumin/ibuprofen molar ratios demonstrates a selective stability of the protein domains where the binding sites of the drug are localized. At the highest ibuprofen concentration, the melting temperature increased by about 10°C with respect to the drug-free protein, whereas the unfolding enthalpy maintains an almost constant value. Furthermore, the degree of protein stabilization depends upon the chirality of the drug, and the R(-) enantiomer is more effective compared to the S(+) form. The stability is supported by molecular dynamics simulations, showing that ibuprofen maintains a stable coordination in the most favorable binding sites, leading to a more compact protein structure at high temperature. The overall results attest that the binding of ibuprofen determines on albumin a stereoselective and domain-specific stabilization with a predominantly entropic character, contributing to clarify significant aspects of the molecular mechanism of protein/drug interaction.
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Affiliation(s)
- Alexa Guglielmelli
- Molecular Biophysics Laboratory, Department of Physics, University of Calabria, 87036 Rende, Italy
| | - Bruno Rizzuti
- CNR-NANOTEC, Licryl-UOS Cosenza and CEMIF.Cal, Department of Physics, University of Calabria, 87036 Rende, Italy
| | - Rita Guzzi
- Molecular Biophysics Laboratory, Department of Physics, University of Calabria, 87036 Rende, Italy.
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13
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Goncharov NV, Terpilovskii MA, Shmurak VI, Belinskaya DA, Avdonin PV. Comparative analysis of esterase and paraoxonase activities of different serum albumin species. J EVOL BIOCHEM PHYS+ 2017. [DOI: 10.1134/s0022093017040032] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Shrestha UR, Bhowmik D, Van Delinder KW, Mamontov E, O’Neill H, Zhang Q, Alatas A, Chu XQ. Collective Excitations in Protein as a Measure of Balance Between its Softness and Rigidity. J Phys Chem B 2017; 121:923-930. [DOI: 10.1021/acs.jpcb.6b10245] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Utsab R. Shrestha
- Department
of Physics and Astronomy, Wayne State University, Detroit, MI 48201, United States
| | - Debsindhu Bhowmik
- Computational
Science and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
| | - Kurt W. Van Delinder
- Department
of Physics and Astronomy, Wayne State University, Detroit, MI 48201, United States
| | - Eugene Mamontov
- Chemical
and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
| | - Hugh O’Neill
- Biology
and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
| | - Qiu Zhang
- Biology
and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
| | - Ahmet Alatas
- Advanced
Photon Source, Argonne National laboratory, Argonne, IL 60439, United States
| | - Xiang-Qiang Chu
- Department
of Physics and Astronomy, Wayne State University, Detroit, MI 48201, United States
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15
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Li Y, Chen C, Zhang C, Duan J, Yao H, Wei Q. Probing the binding interaction of AKR with human serum albumin by multiple fluorescence spectroscopy and molecular modeling. J Biomol Struct Dyn 2016; 35:1189-1199. [DOI: 10.1080/07391102.2016.1174622] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Yan Li
- School of Pharmacy and Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, Jiangsu 221004, China
| | - Chun Chen
- School of Pharmacy and Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, Jiangsu 221004, China
| | - Chunping Zhang
- School of Pharmacy and Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, Jiangsu 221004, China
| | - Jingyu Duan
- School of Pharmacy and Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, Jiangsu 221004, China
| | - Huankai Yao
- School of Pharmacy and Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, Jiangsu 221004, China
- Faculty of Health Sciences, University of Macau, Macau SAR, Taipa, China
| | - Qunli Wei
- School of Pharmacy and Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, Jiangsu 221004, China
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16
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Kikhney AG, Svergun DI. A practical guide to small angle X-ray scattering (SAXS) of flexible and intrinsically disordered proteins. FEBS Lett 2015; 589:2570-7. [PMID: 26320411 DOI: 10.1016/j.febslet.2015.08.027] [Citation(s) in RCA: 370] [Impact Index Per Article: 41.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2015] [Revised: 08/14/2015] [Accepted: 08/15/2015] [Indexed: 12/17/2022]
Abstract
Small-angle X-ray scattering (SAXS) is a biophysical method to study the overall shape and structural transitions of biological macromolecules in solution. SAXS provides low resolution information on the shape, conformation and assembly state of proteins, nucleic acids and various macromolecular complexes. The technique also offers powerful means for the quantitative analysis of flexible systems, including intrinsically disordered proteins (IDPs). Here, the basic principles of SAXS are presented, and profits and pitfalls of the characterization of multidomain flexible proteins and IDPs using SAXS are discussed from the practical point of view. Examples of the synergistic use of SAXS with high resolution methods like X-ray crystallography and nuclear magnetic resonance (NMR), as well as other experimental and in silico techniques to characterize completely, or partially unstructured proteins, are presented.
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Affiliation(s)
- Alexey G Kikhney
- European Molecular Biology Laboratory, Hamburg Outstation, Notkestr. 85, Geb. 25a, 22607 Hamburg, Germany
| | - Dmitri I Svergun
- European Molecular Biology Laboratory, Hamburg Outstation, Notkestr. 85, Geb. 25a, 22607 Hamburg, Germany.
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17
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Travaglini L, Gubitosi M, di Gregorio MC, Pavel NV, D'Annibale A, Giustini M, Soto Tellini VH, Vázquez Tato J, Obiols-Rabasa M, Bayati S, Galantini L. On the self-assembly of a tryptophan labeled deoxycholic acid. Phys Chem Chem Phys 2015; 16:19492-504. [PMID: 25103526 DOI: 10.1039/c4cp02371d] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Self-assembly of peptides and bile acids has been widely investigated because of their biological role and their potential as a tool for the preparation of nanostructured biomaterials. We herein report both the synthesis and the self-association behavior of a compound that combines the aggregation properties of bile acid- and amino acid-based molecules. The derivative has been prepared by introducing a L-tryptophan residue into the C-3 position of the deoxycholic acid skeleton and resulted in an amphoteric fluorescent labeled bile acid that shows a pH-dependent self-assembly. Under alkaline conditions it assembles into 28 nm diameter tubules, thus showing a completely different behavior compared to the precursor bile acid, which forms micelles under similar conditions. Upon heating the tubules break and turn into micelles, leading to an increase in the exposure to water of the tryptophan residue. On the other hand, in acidic solutions it aggregates into elongated micelles that further self-assemble forming a gel network, when an electrolyte is added.
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Affiliation(s)
- Leana Travaglini
- Department of Chemistry, "Sapienza" University of Rome, P. le A. Moro 5, 00185 Rome, Italy.
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18
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Molecular interactions between some non-steroidal anti-inflammatory drugs (NSAID׳s) and bovine (BSA) or human (HSA) serum albumin estimated by means of isothermal titration calorimetry (ITC) and frontal analysis capillary electrophoresis (FA/CE). Talanta 2014; 130:241-50. [DOI: 10.1016/j.talanta.2014.06.060] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Revised: 06/19/2014] [Accepted: 06/26/2014] [Indexed: 11/16/2022]
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19
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BSA/polyelectrolyte core–shell nanoparticles for controlled release of encapsulated ibuprofen. Colloids Surf B Biointerfaces 2014; 123:616-22. [DOI: 10.1016/j.colsurfb.2014.10.005] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Revised: 09/20/2014] [Accepted: 10/01/2014] [Indexed: 11/17/2022]
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20
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21
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Del Giudice A, Leggio C, Balasco N, Galantini L, Pavel NV. Ibuprofen and Propofol Cobinding Effect on Human Serum Albumin Unfolding in Urea. J Phys Chem B 2014; 118:10043-51. [DOI: 10.1021/jp504280n] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Alessandra Del Giudice
- Dipartimento
di Chimica, Sapienza Università di Roma, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Claudia Leggio
- Dipartimento
di Chimica, Sapienza Università di Roma, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Nicole Balasco
- Dipartimento
di Chimica, Sapienza Università di Roma, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Luciano Galantini
- Dipartimento
di Chimica, Sapienza Università di Roma, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Nicolae V. Pavel
- Dipartimento
di Chimica, Sapienza Università di Roma, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
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22
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Yadav R, Sengupta B, Sen P. Conformational Fluctuation Dynamics of Domain I of Human Serum Albumin in the Course of Chemically and Thermally Induced Unfolding Using Fluorescence Correlation Spectroscopy. J Phys Chem B 2014; 118:5428-38. [DOI: 10.1021/jp502762t] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rajeev Yadav
- Department
of Chemistry Indian Institute of Technology Kanpur, Kanpur 208 016, UP, India
| | - Bhaswati Sengupta
- Department
of Chemistry Indian Institute of Technology Kanpur, Kanpur 208 016, UP, India
| | - Pratik Sen
- Department
of Chemistry Indian Institute of Technology Kanpur, Kanpur 208 016, UP, India
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23
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Rehman MT, Shamsi H, Khan AU. Insight into the binding mechanism of imipenem to human serum albumin by spectroscopic and computational approaches. Mol Pharm 2014; 11:1785-97. [PMID: 24745377 DOI: 10.1021/mp500116c] [Citation(s) in RCA: 170] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The mechanism of interaction between imipenem and HSA was investigated by various techniques like fluorescence, UV.vis absorbance, FRET, circular dichroism, urea denaturation, enzyme kinetics, ITC, and molecular docking. We found that imipenem binds to HSA at a high affinity site located in subdomain IIIA (Sudlow's site I) and a low affinity site located in subdomain IIA.IIB. Electrostatic interactions played a vital role along with hydrogen bonding and hydrophobic interactions in stabilizing the imipenem.HSA complex at subdomain IIIA, while only electrostatic and hydrophobic interactions were present at subdomain IIA.IIB. The binding and thermodynamic parameters obtained by ITC showed that the binding of imipenem to HSA was a spontaneous process (ΔGD⁰(D)= -32.31 kJ mol(-1) for high affinity site and ΔGD⁰(D) = -23.02 kJ mol(-1) for low affinity site) with binding constants in the range of 10(4)-10(5) M(-1). Spectroscopic investigation revealed only one binding site of imipenem on HSA (Ka∼10(4) M(-1)). FRET analysis showed that the binding distance between imipenem and HSA (Trp-214) was optimal (r = 4.32 nm) for quenching to occur. Decrease in esterase-like activity of HSA in the presence of imipenem showed that Arg-410 and Tyr-411 of subdomain IIIA (Sudlow's site II) were directly involved in the binding process. CD spectral analysis showed altered conformation of HSA upon imipenem binding. Moreover, the binding of imipenem to subdomain IIIA (Sudlow's site II) of HSA also affected its folding pathway as clear from urea-induced denaturation studies.
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Affiliation(s)
- Md Tabish Rehman
- Medical Microbiology and Molecular Biology Laboratory, Interdisciplinary Biotechnology Unit, Aligarh Muslim University , Aligarh, Uttar Pradesh, 202 002, India
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24
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Ding D, Tang X, Cao X, Wu J, Yuan A, Qiao Q, Pan J, Hu Y. Novel self-assembly endows human serum albumin nanoparticles with an enhanced antitumor efficacy. AAPS PharmSciTech 2014; 15:213-22. [PMID: 24287627 DOI: 10.1208/s12249-013-0041-3] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Accepted: 10/08/2013] [Indexed: 12/18/2022] Open
Abstract
Protein-based nanomedicine plays an important role in tumor chemotherapy due to their merits in bioavailability, biocompatibility, biodegradability, and low toxicity. In this study, we developed a novel method of preparing human serum albumin (HSA) nanoparticles for targeted delivery of paclitaxel (PTX) to tumors. HSA-PTX nanoparticles (NPs-PTX) were fabricated via unfolding of HSA in appropriate solution to expose more hydrophobic domains and consequent self-assembling into nanoparticles with added PTX. Via this self-assembly method, a desirable particle size (around 120 nm), a high drug loading (>20%), and a high encapsulation efficiency (near 100%) were obtained. PTX dispersed as an amorphous state in NPs-PTX and the secondary structures of HSA were maintained. In a cytotoxicity study, NPs-PTX displayed an enhanced cytotoxicity in MCF-7 and A549 cells. Confocal microscopy and flow cytometry revealed that the uptake of NPs-PTX was mediated by secreted protein acidic and rich in cysteine and "caveolar" transport. In H22 tumor-bearing mice, NPs-PTX displayed an increasing and everlasting tumor distribution, leading to slower tumor growth and longer mice survival than PTX. Therefore, this novel self-assembly method offers a much easier method to prepare PTX nanoparticles, provides better antitumor efficacy in vitro and in vivo, and more importantly, sets up a delivery platform for other hydrophobic drugs to improve their effectiveness in cancer therapy.
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25
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Benedetti M, Andreani F, Leggio C, Galantini L, Di Matteo A, Pavel NV, De Lorenzo G, Cervone F, Federici L, Sicilia F. A single amino-acid substitution allows endo-polygalacturonase of Fusarium verticillioides to acquire recognition by PGIP2 from Phaseolus vulgaris. PLoS One 2013; 8:e80610. [PMID: 24260434 DOI: 10.1371/10.1371/journal.pone.0080610] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Accepted: 10/12/2013] [Indexed: 05/25/2023] Open
Abstract
Polygalacturonases (PGs) are secreted by phytopathogenic fungi to degrade the plant cell wall homogalacturonan during plant infection. To counteract Pgs, plants have evolved polygalacturonase-inhibiting proteins (PGIPs) that slow down fungal infection and defend cell wall integrity. PGIPs favour the accumulation of oligogalacturonides, which are homogalacturonan fragments that act as endogenous elicitors of plant defence responses. We have previously shown that PGIP2 from Phaseolus vulgaris (PvPGIP2) forms a complex with PG from Fusarium phyllophilum (FpPG), hindering the enzyme active site cleft from substrate. Here we analyse by small angle X-ray scattering (SAXS) the interaction between PvPGIP2 and a PG from Colletotrichum lupini (CluPG1). We show a different shape of the PG-PGIP complex, which allows substrate entry and provides a structural explanation for the different inhibition kinetics exhibited by PvPGIP2 towards the two isoenzymes. The analysis of SAXS structures allowed us to investigate the basis of the inability of PG from Fusarium verticilloides (FvPG) to be inhibited by PvPGIP2 or by any other known PGIP. FvPG is 92.5% identical to FpPG, and we show here, by both loss- and gain-of-function mutations, that a single amino acid site acts as a switch for FvPG recognition by PvPGIP2.
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Affiliation(s)
- Manuel Benedetti
- Dipartimento di Biologia e Biotecnologie "Charles Darwin", Sapienza Università di Roma, Roma, Italy
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26
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Benedetti M, Andreani F, Leggio C, Galantini L, Di Matteo A, Pavel NV, De Lorenzo G, Cervone F, Federici L, Sicilia F. A single amino-acid substitution allows endo-polygalacturonase of Fusarium verticillioides to acquire recognition by PGIP2 from Phaseolus vulgaris. PLoS One 2013; 8:e80610. [PMID: 24260434 PMCID: PMC3834070 DOI: 10.1371/journal.pone.0080610] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Accepted: 10/12/2013] [Indexed: 12/04/2022] Open
Abstract
Polygalacturonases (PGs) are secreted by phytopathogenic fungi to degrade the plant cell wall homogalacturonan during plant infection. To counteract Pgs, plants have evolved polygalacturonase-inhibiting proteins (PGIPs) that slow down fungal infection and defend cell wall integrity. PGIPs favour the accumulation of oligogalacturonides, which are homogalacturonan fragments that act as endogenous elicitors of plant defence responses. We have previously shown that PGIP2 from Phaseolus vulgaris (PvPGIP2) forms a complex with PG from Fusarium phyllophilum (FpPG), hindering the enzyme active site cleft from substrate. Here we analyse by small angle X-ray scattering (SAXS) the interaction between PvPGIP2 and a PG from Colletotrichum lupini (CluPG1). We show a different shape of the PG-PGIP complex, which allows substrate entry and provides a structural explanation for the different inhibition kinetics exhibited by PvPGIP2 towards the two isoenzymes. The analysis of SAXS structures allowed us to investigate the basis of the inability of PG from Fusarium verticilloides (FvPG) to be inhibited by PvPGIP2 or by any other known PGIP. FvPG is 92.5% identical to FpPG, and we show here, by both loss- and gain-of-function mutations, that a single amino acid site acts as a switch for FvPG recognition by PvPGIP2.
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Affiliation(s)
- Manuel Benedetti
- Dipartimento di Biologia e Biotecnologie “Charles Darwin”, Sapienza Università di Roma, Roma, Italy
| | - Federico Andreani
- Dipartimento di Biologia e Biotecnologie “Charles Darwin”, Sapienza Università di Roma, Roma, Italy
| | - Claudia Leggio
- Dipartimento di Chimica, Sapienza Università di Roma, Roma, Italy
| | | | - Adele Di Matteo
- Istituto di Biologia e Patologia Molecolari, Consiglio Nazionale delle Ricerche, Roma, Italy
| | | | - Giulia De Lorenzo
- Dipartimento di Biologia e Biotecnologie “Charles Darwin”, Sapienza Università di Roma, Roma, Italy
| | - Felice Cervone
- Dipartimento di Biologia e Biotecnologie “Charles Darwin”, Sapienza Università di Roma, Roma, Italy
| | - Luca Federici
- Dipartimento di Scienze Sperimentali e Cliniche and Centro Scienze dell’Invecchiamento, Università di Chieti-Pescara “G. d’ Annunzio”, Chieti, Italy
| | - Francesca Sicilia
- Dipartimento di Biologia e Biotecnologie “Charles Darwin”, Sapienza Università di Roma, Roma, Italy
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27
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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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28
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Radiolysis of 5,10,15,20-tetrakis(N-methyl-4-pyridyl)-porphyrin or 5,10,15,20-tetrakis(4-sulfonatophenyl)-porphyrin in aqueous solution in the presence and in the absence of DNA or human serum albumin. Radiat Phys Chem Oxf Engl 1993 2013. [DOI: 10.1016/j.radphyschem.2013.05.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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29
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Sulfadiazine binds and unfolds bovine serum albumin: an in vitro study. Mol Biol Rep 2013; 40:6081-90. [DOI: 10.1007/s11033-013-2719-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Accepted: 09/14/2013] [Indexed: 12/16/2022]
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30
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Xiong X, Zhang Q, Nan Y, Gu X. A method of chemiluminescence coupled with ultrafiltration for investigating the interaction between ibuprofen and human serum albumin. LUMINESCENCE 2012; 28:954-60. [DOI: 10.1002/bio.2465] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2012] [Revised: 11/10/2012] [Accepted: 11/13/2012] [Indexed: 11/09/2022]
Affiliation(s)
- Xunyu Xiong
- College of Chemistry and Chemical Engineering; Xi'an Shiyou University; Xi'an 710065 China
| | - Qunzheng Zhang
- College of Chemistry and Chemical Engineering; Xi'an Shiyou University; Xi'an 710065 China
| | - Yefei Nan
- College of Chemistry and Chemical Engineering; Xi'an Shiyou University; Xi'an 710065 China
| | - Xuefan Gu
- College of Chemistry and Chemical Engineering; Xi'an Shiyou University; Xi'an 710065 China
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31
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Sasmal DK, Mondal T, Sen Mojumdar S, Choudhury A, Banerjee R, Bhattacharyya K. An FCS study of unfolding and refolding of CPM-labeled human serum albumin: role of ionic liquid. J Phys Chem B 2011; 115:13075-83. [PMID: 21950461 DOI: 10.1021/jp207829y] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The effect of a room temperature ionic liquid (RTIL) on the conformational dynamics of a protein, human serum albumin (HSA), is studied by fluorescence correlation spectroscopy (FCS). For this, the protein was covalently labeled by a fluorophore, 7-dimethylamino-3-(4-maleimidophenyl)-4-methylcoumarin (CPM). On addition of a RTIL ([pmim][Br]) to the native protein, the diffusion coefficient (D(t)) decreases and the hydrodynamic radius (R(h)) increases. This suggests that the RTIL ([pmim][Br]) acts as a denaturant when the protein is in the native state. However, addition of [pmim][Br] to a protein denatured by GdnHCl causes an increases in D(t) and decrease in R(h). This suggests that in the presence of GdnHCl addition of RTIL helps the protein to refold. In the native state, the conformational dynamics of protein is described by three distinct time constants: ~3.6 ± 0.7, ~29 ± 4.5, and 133 ± 23 μs. The faster components (~3.6 ± 0.7 and ~29 ± 4.5 μs) are ascribed to chain dynamics of the protein, while the slowest component (133 μs) is responsible for interchain interaction or concerted motion. On addition of [pmim][Br], the conformational dynamics of HSA becomes slower (~5.1 ± 1, ~43.5 ± 2.8, and ~311 ± 2.3 μs in the presence of 1.5 M [pmim][Br]). The time constants for the protein denatured by 6 M GdnHCl are 3.2 ± 0.4, 34 ± 6, and 207 ± 38 μs. When 1.5 M [pmim][Br] is added to the denatured protein (in 6 M GdnHCl), the time constants become ~5 ± 1, ~41 ± 10, and ~230 ± 45 μs. The lifetime histogram shows that, on addition of GdnHCl to HSA, the contribution of the shorter lifetime component decreases and vanishes at 6 M GdnHCl. The shorter lifetime component immediately reappears after addition of RTIL to unfolded HSA. This suggests recoiling of the unfolded protein by RTIL.
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Affiliation(s)
- Dibyendu Kumar Sasmal
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, India
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32
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Benedetti M, Leggio C, Federici L, De Lorenzo G, Pavel NV, Cervone F. Structural resolution of the complex between a fungal polygalacturonase and a plant polygalacturonase-inhibiting protein by small-angle X-ray scattering. PLANT PHYSIOLOGY 2011; 157:599-607. [PMID: 21859985 PMCID: PMC3192570 DOI: 10.1104/pp.111.181057] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2011] [Accepted: 08/15/2011] [Indexed: 05/07/2023]
Abstract
We report here the low-resolution structure of the complex formed by the endo-polygalacturonase from Fusarium phyllophilum and one of the polygalacturonase-inhibiting protein from Phaseolus vulgaris after chemical cross-linking as determined by small-angle x-ray scattering analysis. The inhibitor engages its concave surface of the leucine-rich repeat domain with the enzyme. Both sides of the enzyme active site cleft interact with the inhibitor, accounting for the competitive mechanism of inhibition observed. The structure is in agreement with previous site-directed mutagenesis data and has been further validated with structure-guided mutations and subsequent assay of the inhibitory activity. The structure of the complex may help the design of inhibitors with improved or new recognition capabilities to be used for crop protection.
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Affiliation(s)
| | | | | | | | | | - Felice Cervone
- Dipartimento di Biologia e Biotecnologie C. Darwin (M.B., G.D.L., F.C.) and Dipartimento di Chimica (C.L., N.V.P.), Istituto Pasteur-Fondazione Cenci Bolognetti, Sapienza Università di Roma, 00185 Rome, Italy; Dipartimento di Scienze Biomediche, Centro Scienze dell’Invecchiamento, Universitá di Chieti G. D’Annunzio, 66013 Chieti, Italy (L.F.)
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Kaneko K, Chuang VTG, Minomo A, Yamasaki K, Bhagavan NV, Maruyama T, Otagiri M. Histidine146 of human serum albumin plays a prominent role at the interface of subdomains IA and IIA in allosteric ligand binding. IUBMB Life 2011; 63:277-85. [PMID: 21488149 DOI: 10.1002/iub.457] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Fatty acids are endogenous ligands of human serum albumin (HSA) that induce conformational changes and participate in allosteric ligand binding to HSA. In a previous study, we showed that, when myristate (MYR) is present, the binding of [(14) C]ketoprofen (KP) to subdomain IA of HSA was increased, indicating that, when MYR binds to HSA, a new binding site in formed in that region. Meanwhile, an N-B transition has been reported to increase the binding of ligands at alkaline pH when the status of albumin is the B-conformer. Six histidine single mutants of HSA, H9A, H39A, H67A, H105A, H128A and H146A were produced and photolabeled with [(14) C]KP at pH 6.5, 7.4 and 8.2 and the role of each histidine in causing the N-B transition induced allosteric ligand binding was examined. Cyanogen bromide cleavage of the photolabeled native HSA showed that subdomain IA was the site of the allosteric binding of KP at pH 8.2. From the photolabeling results, H146 was found to play a prominent role whilst H128 played little or no role in the allosteric binding. However, the remaining 4 mutants did not show a clear photolabeling pattern that was similar to either native HSA or H146A and, as a result, no firm conclusions can be made. An additional histidine mutant, H146I, was produced to confirm the results for H146A. A similar experiment using H146I showed that a benzene ring-like structure at position 146 is required for the allosteric ligand binding to occur.
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Affiliation(s)
- Kenichi Kaneko
- Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto-shi, Kumamoto, Japan
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34
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Site-selective probe for investigating the asynchronous unfolding of domains in bovine serum albumin. Talanta 2011; 84:881-6. [DOI: 10.1016/j.talanta.2011.02.027] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2010] [Revised: 02/09/2011] [Accepted: 02/16/2011] [Indexed: 11/20/2022]
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