51
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Sand KMK, Bern M, Nilsen J, Dalhus B, Gunnarsen KS, Cameron J, Grevys A, Bunting K, Sandlie I, Andersen JT. Interaction with both domain I and III of albumin is required for optimal pH-dependent binding to the neonatal Fc receptor (FcRn). J Biol Chem 2014; 289:34583-94. [PMID: 25344603 DOI: 10.1074/jbc.m114.587675] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Albumin is an abundant blood protein that acts as a transporter of a plethora of small molecules like fatty acids, hormones, toxins, and drugs. In addition, it has an unusual long serum half-life in humans of nearly 3 weeks, which is attributed to its interaction with the neonatal Fc receptor (FcRn). FcRn protects albumin from intracellular degradation via a pH-dependent cellular recycling mechanism. To understand how FcRn impacts the role of albumin as a distributor, it is of importance to unravel the structural mechanism that determines pH-dependent binding. Here, we show that although the C-terminal domain III (DIII) of human serum albumin (HSA) contains the principal binding site, the N-terminal domain I (DI) is important for optimal FcRn binding. Specifically, structural inspection of human FcRn (hFcRn) in complex with HSA revealed that two exposed loops of DI were in proximity with the receptor. To investigate to what extent these contacts affected hFcRn binding, we targeted selected amino acid residues of the loops by mutagenesis. Screening by in vitro interaction assays revealed that several of the engineered HSA variants showed decreased binding to hFcRn, which was also the case for two missense variants with mutations within these loops. In addition, four of the variants showed improved binding. Our findings demonstrate that both DI and DIII are required for optimal binding to FcRn, which has implications for our understanding of the FcRn-albumin relationship and how albumin acts as a distributor. Such knowledge may inspire development of novel HSA-based diagnostics and therapeutics.
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Affiliation(s)
- Kine Marita Knudsen Sand
- From the Centre for Immune Regulation (CIR) and Department of Biosciences, University of Oslo, N-0316 Oslo, Norway, CIR and Department of Immunology, Oslo University Hospital Rikshospitalet and University of Oslo, Norway, P. O. Box 4950, N-0424 Oslo, Norway
| | - Malin Bern
- From the Centre for Immune Regulation (CIR) and Department of Biosciences, University of Oslo, N-0316 Oslo, Norway, CIR and Department of Immunology, Oslo University Hospital Rikshospitalet and University of Oslo, Norway, P. O. Box 4950, N-0424 Oslo, Norway
| | - Jeannette Nilsen
- CIR and Department of Immunology, Oslo University Hospital Rikshospitalet and University of Oslo, Norway, P. O. Box 4950, N-0424 Oslo, Norway, Institute of Clinical Medicine, University of Oslo, N-0424 Oslo, Norway
| | - Bjørn Dalhus
- Department for Microbiology, Oslo University Hospital Rikshospitalet and University of Oslo, P. O. Box 4950, Nydalen, N-0424 Oslo, Norway, Department of Medical Biochemistry, Oslo University Hospital Rikshospitalet and University of Oslo, P. O. Box 4950, Nydalen, N-0424 Oslo, Norway, and Novozymes Biopharma UK Ltd., Castle Court, 59 Castle Boulevard, NG7 1FD Nottingham, United Kingdom
| | - Kristin Støen Gunnarsen
- CIR and Department of Immunology, Oslo University Hospital Rikshospitalet and University of Oslo, Norway, P. O. Box 4950, N-0424 Oslo, Norway
| | - Jason Cameron
- Novozymes Biopharma UK Ltd., Castle Court, 59 Castle Boulevard, NG7 1FD Nottingham, United Kingdom
| | - Algirdas Grevys
- From the Centre for Immune Regulation (CIR) and Department of Biosciences, University of Oslo, N-0316 Oslo, Norway, CIR and Department of Immunology, Oslo University Hospital Rikshospitalet and University of Oslo, Norway, P. O. Box 4950, N-0424 Oslo, Norway
| | - Karen Bunting
- Institute of Clinical Medicine, University of Oslo, N-0424 Oslo, Norway
| | - Inger Sandlie
- From the Centre for Immune Regulation (CIR) and Department of Biosciences, University of Oslo, N-0316 Oslo, Norway, CIR and Department of Immunology, Oslo University Hospital Rikshospitalet and University of Oslo, Norway, P. O. Box 4950, N-0424 Oslo, Norway
| | - Jan Terje Andersen
- CIR and Department of Immunology, Oslo University Hospital Rikshospitalet and University of Oslo, Norway, P. O. Box 4950, N-0424 Oslo, Norway,
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52
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Kang CC, Lin JM, Xu Z, Kumar S, Herr AE. Single-cell Western blotting after whole-cell imaging to assess cancer chemotherapeutic response. Anal Chem 2014; 86:10429-36. [PMID: 25226230 PMCID: PMC4204918 DOI: 10.1021/ac502932t] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Accepted: 09/16/2014] [Indexed: 12/12/2022]
Abstract
Intratumor heterogeneity remains a major obstacle to effective cancer therapy and personalized medicine. Current understanding points to differential therapeutic response among subpopulations of tumor cells as a key challenge to successful treatment. To advance our understanding of how this heterogeneity is reflected in cell-to-cell variations in chemosensitivity and expression of drug-resistance proteins, we optimize and apply a new targeted proteomics modality, single-cell western blotting (scWestern), to a human glioblastoma cell line. To acquire both phenotypic and proteomic data on the same, single glioblastoma cells, we integrate high-content imaging prior to the scWestern assays. The scWestern technique supports thousands of concurrent single-cell western blots, with each assay comprised of chemical lysis of single cells seated in microwells, protein electrophoresis from those microwells into a supporting polyacrylamide (PA) gel layer, and in-gel antibody probing. We systematically optimize chemical lysis and subsequent polyacrylamide gel electrophoresis (PAGE) of the single-cell lysate. The scWestern slides are stored for months then reprobed, thus allowing archiving and later analysis as relevant to sparingly limited, longitudinal cell specimens. Imaging and scWestern analysis of single glioblastoma cells dosed with the chemotherapeutic daunomycin showed both apoptotic (cleaved caspase 8- and annexin V-positive) and living cells. Intriguingly, living glioblastoma subpopulations show up-regulation of a multidrug resistant protein, P-glycoprotein (P-gp), suggesting an active drug efflux pump as a potential mechanism of drug resistance. Accordingly, linking of phenotype with targeted protein analysis with single-cell resolution may advance our understanding of drug response in inherently heterogeneous cell populations, such as those anticipated in tumors.
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Affiliation(s)
- Chi-Chih Kang
- Department
of Bioengineering and The UC Berkeley/UCSF Graduate Program in Bioengineering, University of California Berkeley, Berkeley, California 94720, United States
| | - Jung-Ming
G. Lin
- Department
of Bioengineering and The UC Berkeley/UCSF Graduate Program in Bioengineering, University of California Berkeley, Berkeley, California 94720, United States
| | - Zhuchen Xu
- Department
of Bioengineering and The UC Berkeley/UCSF Graduate Program in Bioengineering, University of California Berkeley, Berkeley, California 94720, United States
| | - Sanjay Kumar
- Department
of Bioengineering and The UC Berkeley/UCSF Graduate Program in Bioengineering, University of California Berkeley, Berkeley, California 94720, United States
| | - Amy E. Herr
- Department
of Bioengineering and The UC Berkeley/UCSF Graduate Program in Bioengineering, University of California Berkeley, Berkeley, California 94720, United States
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53
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Structural changes of ultrasonicated bovine serum albumin revealed by hydrogen–deuterium exchange and mass spectrometry. Anal Bioanal Chem 2014; 406:7243-51. [DOI: 10.1007/s00216-014-8136-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Revised: 08/18/2014] [Accepted: 08/26/2014] [Indexed: 10/24/2022]
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54
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Samanta N, Mahanta DD, Hazra S, Kumar GS, Mitra RK. Short chain polyethylene glycols unusually assist thermal unfolding of human serum albumin. Biochimie 2014; 104:81-9. [DOI: 10.1016/j.biochi.2014.05.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Accepted: 05/22/2014] [Indexed: 10/25/2022]
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55
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Chen X, Essner JB, Baker GA. Exploring luminescence-based temperature sensing using protein-passivated gold nanoclusters. NANOSCALE 2014; 6:9594-9598. [PMID: 25017194 DOI: 10.1039/c4nr02069c] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We explore the analytical performance and limitations of optically monitoring aqueous-phase temperature using protein-protected gold nanoclusters (AuNCs). Although not reported elsewhere, we find that these bio-passivated AuNCs show pronounced hysteresis upon thermal cycling. This unwanted behaviour can be eliminated by several strategies, including sol-gel coating and thermal denaturation of the biomolecular template, introducing protein-templated AuNC probes as viable nanothermometers.
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Affiliation(s)
- Xi Chen
- Department of Chemistry, University of Missouri-Columbia, Columbia, MO 65211, USA.
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56
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Bhattacharya S, Pandey NK, Roy A, Dasgupta S. Effect of (-)-epigallocatechin gallate on the fibrillation of human serum albumin. Int J Biol Macromol 2014; 70:312-9. [PMID: 25017180 DOI: 10.1016/j.ijbiomac.2014.07.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 07/02/2014] [Accepted: 07/04/2014] [Indexed: 01/05/2023]
Abstract
Human serum albumin (HSA), the most abundant plasma protein in the human body is known to form fibrils under partial denaturing conditions. Natural polyphenols are known to interact with HSA and some polyphenols have been shown to be potent inhibitors of amyloid fibrillation. (-)-Epigallocatechin gallate (EGCG), the major component of green tea is known to inhibit amyloid fibrillation. In this report, we have investigated the effect of EGCG on native HSA as well as on the fibrillation process of HSA from amide III band analysis of their respective visible Raman spectra. The differential role of the tryptophan (Trp214) residue present in domain II of HSA in the absence and presence of EGCG has been pointed out using fluorescence anisotropy and visible Raman spectroscopy.
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Affiliation(s)
| | - Nitin K Pandey
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
| | - Anushree Roy
- Department of Physics, Indian Institute of Technology, Kharagpur 721302, India.
| | - Swagata Dasgupta
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India.
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57
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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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58
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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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59
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Sagoo K, Hirsch R, Johnston P, McLoskey D, Hungerford G. Pre-denaturing transitions in human serum albumin probed using time-resolved phosphorescence. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 124:611-617. [PMID: 24509539 DOI: 10.1016/j.saa.2014.01.073] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Revised: 01/07/2014] [Accepted: 01/10/2014] [Indexed: 06/03/2023]
Abstract
The investigation of protein dynamics has long been of interest, since protein interactions and functions can be determined by their structure and changes in conformation. Although fluorescence, occurring on the nanosecond timescale, from intrinsic fluorescent amino acids has been extensively used, in order to fully access conformational changes longer timescales are required. Phosphorescence enables processes on the microsecond to second timescale to be accessed. However, at room temperature this emission can be weak and non trivial to measure. It requires the removal of oxygen - a common triplet state quencher and appropriate instrumentation. In this work we make use of a chemical deoxygenator to study room temperature phosphorescence from tryptophan in human serum albumin excited using a pulsed UV light emitting diode. This is extended to monitor the phosphorescence emission upon increasing temperature, allowing pre-denaturing transitions to be observed. Time-resolved data are analysed, both as the sum of exponential decays and using a distribution analysis based on non extensive decay kinetics. These results are compared to a fluorescence study and both the average lifetime and contribution of the different emitting components were found to give more dramatic changes on the phosphorescence timescale.
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Affiliation(s)
- Kulwinder Sagoo
- HORIBA Jobin Yvon IBH Ltd., 45 Finnieston Street, Glasgow G3 8JU, UK
| | - Richard Hirsch
- HORIBA Jobin Yvon IBH Ltd., 45 Finnieston Street, Glasgow G3 8JU, UK
| | - Pamela Johnston
- HORIBA Jobin Yvon IBH Ltd., 45 Finnieston Street, Glasgow G3 8JU, UK
| | - David McLoskey
- HORIBA Jobin Yvon IBH Ltd., 45 Finnieston Street, Glasgow G3 8JU, UK
| | - Graham Hungerford
- HORIBA Jobin Yvon IBH Ltd., 45 Finnieston Street, Glasgow G3 8JU, UK.
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60
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Mortimer GM, Butcher NJ, Musumeci AW, Deng ZJ, Martin DJ, Minchin RF. Cryptic epitopes of albumin determine mononuclear phagocyte system clearance of nanomaterials. ACS NANO 2014; 8:3357-3366. [PMID: 24617595 DOI: 10.1021/nn405830g] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
While plasma proteins can influence the physicochemical properties of nanoparticles, the adsorption of protein to the surface of nanomaterials can also alter the structure and function of the protein. Here, we show that plasma proteins form a hard corona around synthetic layered silicate nanoparticles (LSN) and that one of the principle proteins is serum albumin. The protein corona was required for recognition of the nanoparticles by scavenger receptors, a major receptor family associated with the mononuclear phagocyte system (MPS). Albumin alone could direct nanoparticle uptake by human macrophages, which involved class A but not class B scavenger receptors. Upon binding to LSN, albumin unfolded to reveal a cryptic epitope that could also be exposed by heat denaturation. This work provides an understanding of how albumin, and possibly other proteins, can promote nanomaterial recognition by the MPS without albumin requiring chemical modification for scavenger receptor recognition. These findings also demonstrate an additional function for albumin in vivo.
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Affiliation(s)
- Gysell M Mortimer
- School of Biomedical Sciences and ‡Australian Institute for Bioengineering and Nanotechnology, University of Queensland , Brisbane, Queensland, 4072, Australia
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61
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Faroongsarng D, Kongprasertkit J. The role of caprylate ligand ion on the stabilization of human serum albumin. AAPS PharmSciTech 2014; 15:465-71. [PMID: 24470225 DOI: 10.1208/s12249-014-0076-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Accepted: 12/23/2013] [Indexed: 12/12/2022] Open
Abstract
Sodium caprylate was added to a pharmaceutical-grade human serum albumin (HSA) to stabilize the product. In this study we have aimed to establish how caprylate ligand protects HSA from thermal degradation. The fatty acid stabilizer was first removed from commercial HSA by charcoal treatment. Cleaned HSA was made to 10% w/v in pH 7.4 buffered solutions and doped with sodium caprylate in serial concentrations up to 0.16 mmol/g-protein. These solutions as well as a commercial HSA, human serum, and enriched-albumin fraction were subjected to differential scanning calorimetry (DSC) within the temperature range of 37-90°C at a 5.0°C/min scanning rate. The globular size of the cleaned HSA solutions was measured by dynamic light scattering. The denaturing temperatures for albumin with sodium caprylate and a commercial one were significantly higher than for albumin only. It was found that the protein globules of cleaned HSA were not as stable as that of the native one due to aggregation, and the caprylate ion may reduce the aggregation by enlarging the globules' electrical double layer. A rational approximation of the Lumry-Eyring protein denaturation model was used to treat DSC denaturing endotherms. The system turned from irreversible dominant Scheme: N (k3K)→ P to reversible dominant Scheme:N (k1)→ P with the increase in caprylate concentration from null to ~0.08 mmol/g-protein. It was postulated that the caprylate ligand may decrease the rate of reversible unfolding as it binds to the IIIA domain which is prone to reversible unfolding/refolding and causes further difficulty for irreversible denaturation which, in turn, HSA can be stabilized.
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62
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Thakur G, Jiang K, Lee D, Prashanthi K, Kim S, Thundat T. Investigation of pH-induced protein conformation changes by nanomechanical deflection. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:2109-2116. [PMID: 24512545 DOI: 10.1021/la403981t] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Broad-spectrum biosensing technologies examine sensor signals using biomarkers, such as proteins, DNA, antibodies, specific cells, and macromolecules, based on direct- or indirect-conformational changes. Here, we have investigated the pH-dependent conformational isomerization of human serum albumin (HSA) using microcantilevers as a sensing platform. Native and denatured proteins were immobilized on cantilever surfaces to understand the effect of pH on conformational changes of the protein with respect to the coupling ligand. Our results show that protonation and deprotonation of amino acid residues on proteins play a significant role in generating charge-induced cantilever deflection. Surface plasmon resonance (SPR) was employed as a complementary technique to validate the results.
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Affiliation(s)
- Garima Thakur
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta T6G 2 V4, Canada
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63
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Bohlooli M, Moosavi-Movahedi A, F. Taghavi, Maghami P, Saboury A, Moosavi-Movahedi Z, Farhadi M, Hong J, Sheibani N, Habibi-Rezaei M. Investigation of thermal reversibility and stability of glycated human serum albumin. Int J Biol Macromol 2013; 62:358-64. [DOI: 10.1016/j.ijbiomac.2013.09.015] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2013] [Revised: 09/17/2013] [Accepted: 09/17/2013] [Indexed: 12/27/2022]
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64
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Gupta BS, Taha M, Lee MJ. Interactions of bovine serum albumin with biological buffers, TES, TAPS, and TAPSO in aqueous solutions. Process Biochem 2013. [DOI: 10.1016/j.procbio.2013.08.018] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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65
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Price DL, Fu L, Bermejo FJ, Fernandez-Alonso F, Saboungi ML. Hydrogen/deuterium isotope effects in water and aqueous solutions of organic molecules and proteins. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2013.02.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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66
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Picosecond-resolved solvent reorganization and energy transfer in biological and model cavities. Biochimie 2013; 95:1127-35. [PMID: 23376876 DOI: 10.1016/j.biochi.2012.12.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2012] [Accepted: 12/21/2012] [Indexed: 11/22/2022]
Abstract
Water molecules in hydrophobic biological cleft/cavities are of contemporary interest for the biomolecular structure and molecular recognition of hydrophobic ligands/drugs. Here, we have explored picosecond-resolved solvation dynamics of water molecules and associated polar amino acids in the hydrophobic cleft around Cys-34 position of Endogenous Serum Albumin (ESA). While site selective acrylodan labeling to Cys-34 allows us to probe solvation in the cleft, Förster resonance energy transfer (FRET) from intrinsic fluorescent amino acid Trp 214 to the extrinsic acrylodan probes structural integrity of the protein in our experimental condition. Temperature dependent solvation in the cleft clearly shows that the dynamics follows Arrhenius type behavior up to 60 °C, after which a major structural perturbation of the protein is evident. We have also monitored polarization gated dynamics of the acrylodan probe and FRET from Trp 214 to acrylodan at various temperatures. The dynamical behavior of the immediate environments around the probe acrylodan in the cleft has been compared with a model biomimetic cavity of a reverse micelle (w0 = 5). Using same fluorescent probe of acrylodan, we have checked the structural integrity of the model cavity at various temperatures using picosecond-resolved FRET from Trp to acrylodan in the cavity. We have also estimated possible distribution of donor-acceptor distances in the protein and reverse micelles. Our studies reveal that the energetics of the water molecules in the biological cleft is comparable to that in the model cavity indicating a transition from bound state to quasibound state, closely consistent with a recent MD simulation study.
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67
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Pandey S, Baker SN, Pandey S, Baker GA. Fluorescent Probe Studies of Polarity and Solvation within Room Temperature Ionic Liquids: A Review. J Fluoresc 2012; 22:1313-43. [DOI: 10.1007/s10895-012-1073-x] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Accepted: 05/29/2012] [Indexed: 10/28/2022]
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68
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Ray A, Seth BK, Pal U, Basu S. Nickel(II)-Schiff base complex recognizing domain II of bovine and human serum albumin: spectroscopic and docking studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 92:164-74. [PMID: 22446763 DOI: 10.1016/j.saa.2012.02.060] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2011] [Revised: 02/13/2012] [Accepted: 02/17/2012] [Indexed: 05/07/2023]
Abstract
It has been spectroscopically monitored that a mononuclear nickel(II)-Schiff base complex {[NiL]·CH(3)OH=NSC} exhibits greater binding affinity for bovine serum albumin (BSA) than that of its human counterpart (HSA). Moreover the modes of binding of NSC with the two serum albumins also differ significantly. Docking studies predict a relatively rare type of 'superficial binding' of NSC at domain IIB of HSA with certain mobility whereas for BSA such phenomena has not been detected. The mobile nature of NSC at domain IIB of HSA has been well correlated with the spectroscopic results. It is to be noted that thermodynamic parameters for the NSC interaction also differ for the two serum albumins. Occurrence of energy transfer between the donor (Trp of BSA and HSA) and acceptor (NSC) has been obtained by means of Förster resonance energy transfer (FRET). The protein stability on NSC binding has also been experimented by the GuHCl-induced protein unfolding studies. Interestingly it has been found that NSC-HSA interaction enhances the protein stability whereas NSC-BSA binding has no such impact. Such observations are indicative of the fact that the conformation of NSC is responsible in recognizing the two serum albumins and selectively enhancing protein stability.
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Affiliation(s)
- Aurkie Ray
- Chemical Sciences Division, Saha Institute of Nuclear Physics, Kolkata, India
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69
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Pollutant-induced modulation in conformation and β-lactamase activity of human serum albumin. PLoS One 2012; 7:e38372. [PMID: 22685563 PMCID: PMC3369883 DOI: 10.1371/journal.pone.0038372] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Accepted: 05/04/2012] [Indexed: 11/19/2022] Open
Abstract
Structural changes in human serum albumin (HSA) induced by the pollutants 1-naphthol, 2-naphthol and 8-quinolinol were analyzed by circular dichroism, fluorescence spectroscopy and dynamic light scattering. The alteration in protein conformational stability was determined by helical content induction (from 55 to 75%) upon protein-pollutant interactions. Domain plasticity is responsible for the temperature-mediated unfolding of HSA. These findings were compared to HSA-hydrolase activity. We found that though HSA is a monomeric protein, it shows heterotropic allostericity for β-lactamase activity in the presence of pollutants, which act as K- and V-type non-essential activators. Pollutants cause conformational changes and catalytic modifications of the protein (increase in β-lactamase activity from 100 to 200%). HSA-pollutant interactions mediate other protein-ligand interactions, such as HSA-nitrocefin. Therefore, this protein can exist in different conformations with different catalytic properties depending on activator binding. This is the first report to demonstrate the catalytic allostericity of HSA through a mechanistic approach. We also show a correlation with non-microbial drug resistance as HSA is capable of self-hydrolysis of β-lactam drugs, which is further potentiated by pollutants due to conformational changes in HSA.
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70
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Ding F, Li XN, Diao JX, Sun Y, Zhang L, Sun Y. Chiral recognition of metalaxyl enantiomers by human serum albumin: evidence from molecular modeling and photophysical approach. Chirality 2012; 24:471-80. [DOI: 10.1002/chir.22024] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Accepted: 02/23/2012] [Indexed: 01/27/2023]
Affiliation(s)
- Fei Ding
- Department of Chemistry; China Agricultural University; Beijing; China
| | - Xiu-Nan Li
- National Key Laboratory of Biochemical Engineering, Institute of Process Engineering; Chinese Academy of Sciences; Beijing; China
| | - Jian-Xiong Diao
- College of Resources and Environmental Sciences; China Agricultural University; Beijing; China
| | - Ye Sun
- Department of Chemistry; China Agricultural University; Beijing; China
| | - Li Zhang
- Key Laboratory of Pesticide Chemistry and Application Technology, Ministry of Agriculture, Department of Applied Chemistry; China Agricultural University; Beijing; China
| | - Ying Sun
- College of Resources and Environmental Sciences; China Agricultural University; Beijing; China
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71
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Luong TQ, Verma PK, Mitra RK, Havenith M. Do hydration dynamics follow the structural perturbation during thermal denaturation of a protein: a terahertz absorption study. Biophys J 2011; 101:925-33. [PMID: 21843484 DOI: 10.1016/j.bpj.2011.05.011] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Revised: 03/26/2011] [Accepted: 05/03/2011] [Indexed: 01/28/2023] Open
Abstract
We investigate the thermal denaturation of human serum albumin and the associated solvation using terahertz (THz) spectroscopy in aqueous buffer solution. Far- and near-ultraviolet circular dichroism spectroscopy reveal that the protein undergoes a native (N) to extended (E) state transition at temperature ≤55°C with a marginal change in the secondary and tertiary structure. At 70°C, the protein transforms into an unfolded (U) state with significant irreversible disruption of its structures. We measure the concentration- and temperature-dependent THz absorption coefficient (α) of the protein solution using a p-Ge THz difference spectrometer (2.1-2.8 THz frequency range), thereby probing the collective protein-water network dynamics. When the solvated protein is heated up to 55°C and cooled down again, a reversible change in THz absorption is observed. When increasing the temperature up to 70°C, we find a dramatic irreversible change of THz absorption. The increase in THz absorption compared to bulk water is attributed to a blue shift in the spectrum of the solvated protein compared to bulk water. This is supported by measurements of THz absorption coefficients using THz time-domain spectroscopy (0.1-1.2 THz frequency range). We also use picosecond-resolved fluorescence spectroscopy of the tryptophan 214 moiety of human serum albumin. All experimental observations can be explained by a change in the hydration dynamics of the solvated protein due to the additional exposure of hydrophobic residues upon unfolding.
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Affiliation(s)
- Trung Quan Luong
- Department of Physical Chemistry II, Ruhr-University Bochum, Bochum, Germany
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72
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Akdogan Y, Hinderberger D. Solvent-Induced Protein Refolding at Low Temperatures. J Phys Chem B 2011; 115:15422-9. [DOI: 10.1021/jp209646f] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yasar Akdogan
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Dariush Hinderberger
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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73
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Ahmad E, Rabbani G, Zaidi N, Singh S, Rehan M, Khan MM, Rahman SK, Quadri Z, Shadab M, Ashraf MT, Subbarao N, Bhat R, Khan RH. Stereo-selectivity of human serum albumin to enantiomeric and isoelectronic pollutants dissected by spectroscopy, calorimetry and bioinformatics. PLoS One 2011; 6:e26186. [PMID: 22073150 PMCID: PMC3206814 DOI: 10.1371/journal.pone.0026186] [Citation(s) in RCA: 120] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2011] [Accepted: 09/22/2011] [Indexed: 11/19/2022] Open
Abstract
1-naphthol (1N), 2-naphthol (2N) and 8-quinolinol (8H) are general water pollutants. 1N and 2N are the configurational enantiomers and 8H is isoelectronic to 1N and 2N. These pollutants when ingested are transported in the blood by proteins like human serum albumin (HSA). Binding of these pollutants to HSA has been explored to elucidate the specific selectivity of molecular recognition by this multiligand binding protein. The association constants (K(b)) of these pollutants to HSA were moderate (10(4)-10(5) M(-1)). The proximity of the ligands to HSA is also revealed by their average binding distance, r, which is estimated to be in the range of 4.39-5.37 nm. The binding free energy (ΔG) in each case remains effectively the same for each site because of enthalpy-entropy compensation (EEC). The difference observed between ΔC(p) (exp) and ΔC(p) (calc) are suggested to be caused by binding-induced flexibility changes in the HSA. Efforts are also made to elaborate the differences observed in binding isotherms obtained through multiple approaches of calorimetry, spectroscopy and bioinformatics. We suggest that difference in dissociation constants of pollutants by calorimetry, spectroscopic and computational approaches could correspond to occurrence of different set of populations of pollutants having different molecular characteristics in ground state and excited state. Furthermore, our observation of enhanced binding of pollutants (2N and 8H) in the presence of hemin signifies that ligands like hemin may enhance the storage period of these pollutants in blood that may even facilitate the ill effects of these pollutants.
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Affiliation(s)
- Ejaz Ahmad
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Gulam Rabbani
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Nida Zaidi
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Saurabh Singh
- School of Biotechnology, Jawaharlal Nehru University, New Delhi, India
| | - Mohd Rehan
- School of Computational and Integrative Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Mohd Moin Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | | | - Zainuddin Quadri
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Mohd. Shadab
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | | | - Naidu Subbarao
- School of Computational and Integrative Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Rajiv Bhat
- School of Biotechnology, Jawaharlal Nehru University, New Delhi, India
| | - Rizwan Hasan Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
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74
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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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75
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Xie X, Wang Z, Zhou X, Wang X, Chen X. Study on the interaction of phthalate esters to human serum albumin by steady-state and time-resolved fluorescence and circular dichroism spectroscopy. JOURNAL OF HAZARDOUS MATERIALS 2011; 192:1291-8. [PMID: 21764513 DOI: 10.1016/j.jhazmat.2011.06.038] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2011] [Revised: 06/12/2011] [Accepted: 06/14/2011] [Indexed: 05/19/2023]
Abstract
Phthalate esters (PAEs) are globally pervasive contaminants that are considered to be endocrine disruptor chemicals and toxic environmental priority pollutants. In this paper, the interactions between PAEs and human serum albumin (HSA) were examined by molecular modelling, steady state and time-resolved fluorescence, ultraviolet-visible spectroscopy (UV-vis) and circular dichroism spectroscopy (CD). The association constants between PAEs and HSA were determined using the Stern-Volmer and Scatchard equations. The binding of dimethyl phthalate (DMP) to HSA has a single class of binding site and its binding constants (K) are 4.08 × 10(3), 3.97 × 10(3), 3.45 × 10(3), and 3.20 × 10(3)L mol(-1) at 289, 296, 303, and 310K, respectively. The Stern-Volmer and Scatchard plots both had two regression curves for HSA-butylbenzyl phthalate (BBP) and HSA-di-2-ethylhexyl phthalate (DEHP), which indicated that these bindings were via two types of binding sites: the numbers of binding site for the first type were lower than for the second type. The binding constants of the first type binding site were higher than those of the second type binding site at corresponding temperatures, the results suggesting that the first type of binding site had high affinity and the second binding site involved other sites with lower binding affinity and selectivity. The thermodynamic parameters of the binding reactions (ΔG°, ΔH° and ΔS°) were measured, and they indicated the presences of hydrophobic forces and hydrogen interactions in the PAEs-HSA interactions, which agreed well with the results from molecular modelling. The alterations of protein secondary structure in the presence of PAEs were confirmed by UV-vis and CD spectroscopy. The time-resolved fluorescence study showed that the lifetime of Trp residue of HSA decreased after the addition of PAEs, which implied that the Trp residue of HSA was the main binding site.
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Affiliation(s)
- Xiaoyun Xie
- National Key Laboratory of Organic Chemistry, Lanzhou University, Lanzhou 730000, China
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76
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Rajdev P, Mondol T, Makhal A, Pal SK. Simultaneous binding of anti-tuberculosis and anti-thrombosis drugs to a human transporter protein: A FRET study. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2011; 103:153-8. [DOI: 10.1016/j.jphotobiol.2011.02.023] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2010] [Revised: 02/25/2011] [Accepted: 02/28/2011] [Indexed: 11/29/2022]
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77
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Fu L, Villette S, Petoud S, Fernandez-Alonso F, Saboungi ML. H/D Isotope Effects in Protein Thermal Denaturation: The Case of Bovine Serum Albumin. J Phys Chem B 2011; 115:1881-8. [DOI: 10.1021/jp104769v] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ling Fu
- Centre de Recherche sur la Matiére Divisée, UMR 6619-CNRS, Université d’Orléans, 1b rue de la Férollerie, 45071 Orléans Cedex 2, France
| | - Sandrine Villette
- Centre de Biophysique Moléculaire, UPR 4301-CNRS, rue Charle Sadron, 45071 Orléans Cedex 2, France
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire, UPR 4301-CNRS, rue Charle Sadron, 45071 Orléans Cedex 2, France
| | - Felix Fernandez-Alonso
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Marie-Louise Saboungi
- Centre de Recherche sur la Matiére Divisée, UMR 6619-CNRS, Université d’Orléans, 1b rue de la Férollerie, 45071 Orléans Cedex 2, France
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78
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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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79
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Attri P, Venkatesu P, Kumar A, Byrne N. A protic ionic liquid attenuates the deleterious actions of urea on α-chymotrypsin. Phys Chem Chem Phys 2011; 13:17023-6. [DOI: 10.1039/c1cp22195g] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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80
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Tetrakis(4-sulfonatophenyl)porphyrin fluorescence as reporter of human serum albumin structural changes induced by guanidine hydrochloride. J Photochem Photobiol A Chem 2011. [DOI: 10.1016/j.jphotochem.2010.09.028] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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81
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Hong Y, Feng C, Yu Y, Liu J, Lam JWY, Luo KQ, Tang BZ. Quantitation, visualization, and monitoring of conformational transitions of human serum albumin by a tetraphenylethene derivative with aggregation-induced emission characteristics. Anal Chem 2010; 82:7035-43. [PMID: 20704392 DOI: 10.1021/ac1018028] [Citation(s) in RCA: 164] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Human serum albumin (HSA) is a major protein component of blood plasma, and its assay is of obvious value to biological research. We, herein, present a readily accessible fluorescent bioprobe for HSA detection and quantitation. A nonemissive tetraphenylethene derivative named sodium 1,2-bis[4-(3-sulfonatopropoxyl)phenyl]-1,2-diphenylethene (BSPOTPE) is induced to emit by HSA, showing a novel phenomenon of aggregation-induced emission (AIE). The AIE bioprobe enjoys a broad working range (0-100 nM), a low detection limit (down to 1 nM), and a superior selectivity to albumins. The fluorescent bioassay is unperturbed by the miscellaneous bioelectrolytes in the artificial urine. The AIE luminogen can also be used as a rapid and sensitive protein stain in gel electrophoresis for HSA visualization. Utilizing the AIE feature of BSPOTPE and the Forster resonance energy transfer from HSA to BSPOTPE, the unfolding process of HSA induced by guanidine hydrochloride is monitored, which reveals a multistep transition with the involvement of molten globule intermediates. Computational modeling suggests that the AIE luminogens dock in the hydrophobic cleft between subdomains IIA and IIIA of HSA with the aid of hydrophobic effect, charge neutralization, and hydrogen bonding interactions, offering mechanistic insight into the microenvironment inside the hydrophobic cavity.
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Affiliation(s)
- Yuning Hong
- Nano Science and Technology Program, Department of Chemistry, Institute of Molecular Functional Materials, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, China
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82
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Pandey NK, Ghosh S, Dasgupta S. Fibrillation in human serum albumin is enhanced in the presence of copper(II). J Phys Chem B 2010; 114:10228-33. [PMID: 20684647 DOI: 10.1021/jp103876p] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The aggregation process in proteins is governed by several factors such as temperature, pH, presence of electrolytes, denaturants, and metal ions. Here, we report the role of Cu(II) in inducing rapid fibrillation in human serum albumin. We have monitored this process via UV-vis spectroscopy, fluorescence spectroscopy, circular dichroism, zeta-potential measurements, electron paramagnetic resonance studies, fluorescence microscopy, and field emission scanning electron microscopy. Images show a fibrillar network of human serum albumin in the presence of Cu(II) in 60% ethanol incubated at 65 degrees C at physiological pH. All other studies also support the enhanced fibrillation in presence of Cu(II).
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Affiliation(s)
- Nitin K Pandey
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
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83
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Vannoy CH, Leblanc RM. Effects of DHLA-Capped CdSe/ZnS Quantum Dots on the Fibrillation of Human Serum Albumin. J Phys Chem B 2010; 114:10881-8. [DOI: 10.1021/jp1045904] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Charles H. Vannoy
- Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146-0431
| | - Roger M. Leblanc
- Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146-0431
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84
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Martínez-Tomé MJ, Esquembre R, Mallavia R, Mateo CR. Formation of Complexes between the Conjugated Polyelectrolyte Poly{[9,9-bis(6′-N,N,N-trimethylammonium)hexyl]fluorene-phenylene} Bromide (HTMA-PFP) and Human Serum Albumin. Biomacromolecules 2010; 11:1494-501. [DOI: 10.1021/bm100123t] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Maria José Martínez-Tomé
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández de Elche, 03202 Elche (Alicante), Spain
| | - Rocío Esquembre
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández de Elche, 03202 Elche (Alicante), Spain
| | - Ricardo Mallavia
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández de Elche, 03202 Elche (Alicante), Spain
| | - C. Reyes Mateo
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández de Elche, 03202 Elche (Alicante), Spain
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85
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Koyama M, Tanaka M, Dhanasekaran P, Lund-Katz S, Phillips MC, Saito H. Interaction between the N- and C-terminal domains modulates the stability and lipid binding of apolipoprotein A-I. Biochemistry 2010; 48:2529-37. [PMID: 19239199 DOI: 10.1021/bi802317v] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The tertiary structures of human and mouse apolipoprotein A-I (apoA-I) are comprised of an N-terminal helix bundle and a separate C-terminal domain. To define the possible intramolecular interaction between the N- and the C-terminal domains, we examined the effects on protein stability and lipid-binding properties of exchanging either the C-terminal domain or helix between human and mouse apoA-I. Chemical denaturation experiments demonstrated that replacement of the C-terminal domain or helical segment in human apoA-I with the mouse counterparts largely destabilizes the N-terminal helix bundle. Removal of the C-terminal domain or alpha-helix in human apoA-I had a similar effect on the destabilization of the helix bundle against urea denaturation, indicating that the C-terminal helical segment mainly contributes to stabilizing the N-terminal helix bundle structure in the apoA-I molecule. Consistent with this, KI quenching experiments indicated that removal or replacement of the C-terminal domain or helix in human apoA-I causes Trp residues in the N-terminal domain to become exposed to solvent. Measurements of the heats of binding to egg phosphatidylcholine (PC) vesicles and the kinetics of solubilization of dimyristoyl PC vesicles demonstrated that the destabilized human N-terminal helix bundle can strongly interact with lipids without the hydrophobic C-terminal helix. In addition, site-specific labeling of the N- and C-terminal helices by acrylodan to probe the conformational stability and the spatial proximity of the two domains indicated that the C-terminal helix is located near the N-terminal helix bundle, leading to a relatively less solvent-exposed, more organized conformation of the C-terminal domain. Taken together, these results suggest that interaction between the N- and C-terminal tertiary structure domains in apoA-I modulates the stability and lipid-binding properties of the N-terminal helix bundle.
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Affiliation(s)
- Mao Koyama
- Department of Biophysical Chemistry, Kobe Pharmaceutical University, 4-19-1 Motoyamakitamachi, Higashinada-ku, Kobe 658-8558, Japan
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86
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Amiri M, Jankeje K, Albani JR. Origin of fluorescence lifetimes in human serum albumin. Studies on native and denatured protein. J Fluoresc 2010; 20:651-6. [PMID: 20195715 DOI: 10.1007/s10895-010-0597-1] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2009] [Accepted: 01/04/2010] [Indexed: 11/29/2022]
Abstract
Human serum albumin consists of a single polypeptide of 585 amino acid residues with 1 Trp residue. In the present work, we measured fluorescence lifetimes of the protein in both native and denatured states. The results indicate that Trp emission occurs with three lifetimes in both states. Lifetimes values and contribution to the global emission decay differ between the two states. Data are interpreted as the results of an emission occurring from three substructures of the tryptophan formed in the excited state. Two of these substructures are already present for the tryptophan free in solution. The third lifetime is the result of the interaction between the tryptophan residue and surrounding microenvironment. The populations of these substructures characterized by the pre-exponential parameters of the fluorescence lifetimes are dependent on the fluorophore microenvironment and on the global protein structure.
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Affiliation(s)
- Megdouda Amiri
- Laboratoire de Biophysique Moléculaire, Université des Sciences et Technologies de Lille, Bâtiment C6, 59655 Villeneuve d'Ascq Cédex, France
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87
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Varshney A, Sen P, Ahmad E, Rehan M, Subbarao N, Khan RH. Ligand binding strategies of human serum albumin: how can the cargo be utilized? Chirality 2010; 22:77-87. [PMID: 19319989 DOI: 10.1002/chir.20709] [Citation(s) in RCA: 242] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Human serum albumin (HSA), being the most abundant carrier protein in blood and a modern day clinical tool for drug delivery, attracts high attention among biologists. Hence, its unfolding/refolding strategies and exogenous/endogenous ligand binding preference are of immense use in therapeutics and clinical biochemistry. Among its fellow proteins albumin is known to carry almost every small molecule. Thus, it is a potential contender for being a molecular cargo/or nanovehicle for clinical, biophysical and industrial purposes. Nonetheless, its structure and function are largely regulated by various chemical and physical factors to accommodate HSA to its functional purpose. This multifunctional protein also possesses enzymatic properties which may be used to convert prodrugs to active therapeutics. This review aims to highlight current overview on the binding strategies of protein to various ligands that may be expected to lead to significant clinical applications.
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Affiliation(s)
- Ankita Varshney
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
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88
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Mitra RK, Verma PK, Wulferding D, Menzel D, Mitra T, Todea AM, Lemmens P, Müller A, Pal SK. A Molecular Magnet Confined in the Nanocage of a Globular Protein. Chemphyschem 2010; 11:389-93. [DOI: 10.1002/cphc.200900708] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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89
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Pastor I, Salinas-Castillo A, Esquembre R, Mallavia R, Mateo C. Multienzymatic system immobilization in sol–gel slides: Fluorescent superoxide biosensors development. Biosens Bioelectron 2010; 25:1526-9. [DOI: 10.1016/j.bios.2009.10.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2009] [Revised: 10/16/2009] [Accepted: 10/20/2009] [Indexed: 11/27/2022]
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90
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Taha M, Lee MJ. Interactions of TRIS [tris(hydroxymethyl)aminomethane] and related buffers with peptide backbone: Thermodynamic characterization. Phys Chem Chem Phys 2010; 12:12840-50. [DOI: 10.1039/c0cp00253d] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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91
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Martin GL, Lau C, Minteer SD, Cooney MJ. Fluorescence analysis of chemical microenvironments and their impact upon performance of immobilized enzyme. Analyst 2010; 135:1131-7. [DOI: 10.1039/b921409g] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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92
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Juárez J, López SG, Cambón A, Taboada P, Mosquera V. Influence of electrostatic interactions on the fibrillation process of human serum albumin. J Phys Chem B 2009; 113:10521-9. [PMID: 19572666 DOI: 10.1021/jp902224d] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The fibrillation propensity of the multidomain protein human serum albumin (HSA) has been analyzed under physiological and acidic conditions at room and elevated temperatures with varying ionic strengths by different spectroscopic techniques. The kinetics of fibril formation under the different solution conditions and the structures of resulting fibrillar aggregates were also determined. In this way, we have observed that fibril formation is largely affected by electrostatic shielding: at physiological pH, fibrillation is progressively more efficient and faster in the presence of up to 50 mM NaCl; meanwhile, at larger salt concentrations, excessive shielding and further enhancement of the solution hydrophobicity might involve a change in the energy landscape of the aggregation process, which makes the fibrillation process difficult. In contrast, under acidic conditions, a continuous progressive enhancement of HSA fibrillation is observed as the electrolyte concentration in solution increases. Both the distinct ionization and initial structural states of the protein before incubation may be the origin of this behavior. CD, FT-IR, and tryptophan fluorescence spectra seem to confirm this picture by monitoring the structural changes in both protein tertiary and secondary structures along the fibrillation process. On the other hand, the fibrillation of HSA does not show a lag phase except at pH 3.0 in the absence of added salt. Finally, differences in the structure of the intermediates and resulting fibrils under the different conditions are also elucidated by TEM and FT-IR.
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Affiliation(s)
- Josué Juárez
- Grupo de Física de Coloides y Polímeros, Departamento de Física de la Materia Condensada, Facultad de Física, Universidad de Santiago de Compostela, E-15782, Santiago de Compostela, Spain
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93
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Togashi DM, Ryder AG, O’Shaughnessy D. Monitoring Local Unfolding of Bovine Serum Albumin During Denaturation Using Steady-State and Time-Resolved Fluorescence Spectroscopy. J Fluoresc 2009; 20:441-52. [DOI: 10.1007/s10895-009-0566-8] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2009] [Accepted: 11/03/2009] [Indexed: 11/28/2022]
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94
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Fluorescence spectral resolution of tryptophan residues in bovine and human serum albumins. J Pharm Biomed Anal 2009; 50:107-16. [DOI: 10.1016/j.jpba.2009.03.015] [Citation(s) in RCA: 219] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2009] [Revised: 03/11/2009] [Accepted: 03/13/2009] [Indexed: 11/20/2022]
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95
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Page TA, Kraut ND, Page PM, Baker GA, Bright FV. Dynamics of Loop 1 of Domain I in Human Serum Albumin When Dissolved in Ionic Liquids. J Phys Chem B 2009; 113:12825-30. [DOI: 10.1021/jp904475v] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Taylor A. Page
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, and Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6110
| | - Nadine D. Kraut
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, and Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6110
| | - Phillip M. Page
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, and Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6110
| | - Gary A. Baker
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, and Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6110
| | - Frank V. Bright
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, and Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6110
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96
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Leggio C, Galantini L, Konarev PV, Pavel NV. Urea-Induced Denaturation Process on Defatted Human Serum Albumin and in the Presence of Palmitic Acid. J Phys Chem B 2009; 113:12590-602. [DOI: 10.1021/jp904330v] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Claudia Leggio
- Dipartimento di Chimica, Sapienza Università di Roma, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy, INFM CRS-SOFT, c/o Sapienza Università di Roma, Roma, Italy, and Hamburg Outstation, European Molecular Biology Laboratory, D-22603 Hamburg, Germany
| | - Luciano Galantini
- Dipartimento di Chimica, Sapienza Università di Roma, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy, INFM CRS-SOFT, c/o Sapienza Università di Roma, Roma, Italy, and Hamburg Outstation, European Molecular Biology Laboratory, D-22603 Hamburg, Germany
| | - Peter V. Konarev
- Dipartimento di Chimica, Sapienza Università di Roma, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy, INFM CRS-SOFT, c/o Sapienza Università di Roma, Roma, Italy, and Hamburg Outstation, European Molecular Biology Laboratory, D-22603 Hamburg, Germany
| | - Nicolae V. Pavel
- Dipartimento di Chimica, Sapienza Università di Roma, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy, INFM CRS-SOFT, c/o Sapienza Università di Roma, Roma, Italy, and Hamburg Outstation, European Molecular Biology Laboratory, D-22603 Hamburg, Germany
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97
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Zhong D. Hydration Dynamics and Coupled Water-Protein Fluctuations Probed by Intrinsic Tryptophan. ADVANCES IN CHEMICAL PHYSICS 2009. [DOI: 10.1002/9780470508602.ch3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
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98
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Venkatesu P, Lee MJ, Lin HM. Osmolyte counteracts urea-induced denaturation of alpha-chymotrypsin. J Phys Chem B 2009; 113:5327-38. [PMID: 19354310 DOI: 10.1021/jp8113013] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stability of proteins is reduced by urea, which is methylamine and nonprotecting osmolyte; eventually urea destabilizes the activity and function and alters the structure of proteins, whereas the stability of proteins is raised by the osmolytes, which are not interfering with the functional activity of proteins. The deleterious effect of urea on proteins has been counteracted by methylamines (osmolytes), such as trimethylamine N-oxide (TMAO), betaine, and sarcosine. To distinctly enunciate the comparison of the counteracting effects between these methylamines on urea-induced denaturation of alpha-chymotrypsin (CT), we measured the hydrodynamic diameter (d(H)) and the thermodynamic properties (T(m), DeltaH, DeltaG(U), and DeltaC(p)) with dynamic light scattering (DLS) and differential scanning calorimeter (DSC), respectively. The present investigation compares the compatibility and counteracting hypothesis by determining the effects of methylamines and urea, as individual components and in combination at a concentration ratio of 1:2 (methylamine:urea) as well as various urea concentrations (0.5-5 M) in the presence of 1 M methylamine. The experimental results revealed that the naturally occurring osmolytes TMAO, betaine, and sarcosine strongly counteracted the urea actions on alpha-chymotrypsin. The results also indicated that TMAO counteracting the urea effects on CT was much stronger than betaine or sarcosine.
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Affiliation(s)
- Pannur Venkatesu
- Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106-07, Taiwan.
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99
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Juárez J, Taboada P, Mosquera V. Existence of different structural intermediates on the fibrillation pathway of human serum albumin. Biophys J 2009; 96:2353-70. [PMID: 19289061 PMCID: PMC2907680 DOI: 10.1016/j.bpj.2008.12.3901] [Citation(s) in RCA: 160] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2008] [Revised: 11/18/2008] [Accepted: 12/01/2008] [Indexed: 10/21/2022] Open
Abstract
The fibrillation propensity of the multidomain protein human serum albumin (HSA) was analyzed under different solution conditions. The aggregation kinetics, protein conformational changes upon self-assembly, and structure of the different intermediates on the fibrillation pathway were determined by means of thioflavin T (ThT) fluorescence and Congo Red absorbance; far- and near-ultraviolet circular dichroism; tryptophan fluorescence; Fourier transform infrared spectroscopy; x-ray diffraction; and transmission electron, scanning electron, atomic force, and microscopies. HSA fibrillation extends over several days of incubation without the presence of a lag phase, except for HSA samples incubated at acidic pH and room temperature in the absence of electrolyte. The absence of a lag phase occurs if the initial aggregation is a downhill process that does not require a highly organized and unstable nucleus. The fibrillation process is accompanied by a progressive increase in the beta-sheet (up to 26%) and unordered conformation at the expense of alpha-helical conformation, as revealed by ThT fluorescence and circular dichroism and Fourier transform infrared spectroscopies, but changes in the secondary structure contents depend on solution conditions. These changes also involve the presence of different structural intermediates in the aggregation pathway, such as oligomeric clusters (globules), bead-like structures, and ring-shaped aggregates. We suggest that fibril formation may take place through the role of association-competent oligomeric intermediates, resulting in a kinetic pathway via clustering of these oligomeric species to yield protofibrils and then fibrils. The resultant fibrils are elongated but curly, and differ in length depending on solution conditions. Under acidic conditions, circular fibrils are commonly observed if the fibrils are sufficiently flexible and long enough for the ends to find themselves regularly in close proximity to each other. These fibrils can be formed by an antiparallel arrangement of beta-strands forming the beta-sheet structure of the HSA fibrils as the most probable configuration. Very long incubation times lead to a more complex morphological variability of amyloid mature fibrils (i.e., long straight fibrils, flat-ribbon structures, laterally connected fibers, etc.). We also observed that mature straight fibrils can also grow by protein oligomers tending to align within the immediate vicinity of the fibers. This filament + monomers/oligomers scenario is an alternative pathway to the otherwise dominant filament + filament manner of the protein fibril's lateral growth. Conformational preferences for a certain pathway to become active may exist, and the influence of environmental conditions such as pH, temperature, and salt must be considered.
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Affiliation(s)
| | - Pablo Taboada
- Grupo de Física de Coloides y Polímeros, Departamento de Física de la Materia Condensada, Facultad de Física, Universidad de Santiago de Compostela, Santiago de Compostela, Spain
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100
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Differential chemical and thermal unfolding pattern of Rv3588c and Rv1284 of Mycobacterium tuberculosis - A comparison by fluorescence and circular dichroism spectroscopy. Biophys Chem 2009; 141:94-104. [PMID: 19181437 DOI: 10.1016/j.bpc.2009.01.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2008] [Revised: 12/30/2008] [Accepted: 01/01/2009] [Indexed: 11/24/2022]
Abstract
The thermal and chemical unfolding pathways of two beta carbonic anhydrases, Rv3588c and Rv1284 of Mycobacterium tuberculosis have been compared by fluorescence and circular dichroism. Chemical and thermal denaturation of the tertiary and secondary structures of these two ubiquitous enzymes of the pathogen reveals that the unfolding of Rv3588c is mediated through the formation of a molten globule intermediate with depleted tertiary structure. However, Rv1284 directly unfolds from the native to the unfolded state. Calculation of the thermodynamic parameters suggest that overall Rv3588c is more stable than Rv1284. Stern-Volmer analysis together with the fluorescence spectra of the proteins suggest that Trp115 in Rv1284 is more buried than Trp10 in Rv3588c. The tryptophan residues in both the proteins are surrounded by positively charged amino acid residues.
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