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Covalent Protein Immobilization onto Muscovite Mica Surface with a Photocrosslinker. MINERALS 2020. [DOI: 10.3390/min10050464] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Muscovite mica with an amino silane-modified surface is commonly used as a substrate in atomic force microscopy (AFM) studies of biological macromolecules. Herein, the efficiency of two different protein immobilization strategies employing either (N-hydroxysuccinimide ester)-based crosslinker (DSP) or benzophenone-based photoactivatable crosslinker (SuccBB) has been compared using AFM and mass spectrometry analysis. Two proteins with different physicochemical properties—human serum albumin (HSA) and horseradish peroxidase enzyme protein (HRP)—have been used as model objects in the study. In the case of HRP, both crosslinkers exhibited high immobilization efficiency—as opposed to the case with HSA, when sufficient capturing efficiency has only been observed with SuccBB photocrosslinker. The results obtained herein can find their application in commonly employed bioanalytical systems and in the development of novel highly sensitive chip-based diagnostic platforms employing immobilized proteins. The obtained data can also be of interest for other research areas in medicine and biotechnology employing immobilized biomolecules.
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Dubey S, Madana SK, Kallubai M, Sarkar A, Subramanyam R. Unraveling the stability of plasma proteins upon interaction of synthesized uridine products: biophysical and molecular dynamics approach. J Biomol Struct Dyn 2019; 38:1927-1937. [PMID: 31099311 DOI: 10.1080/07391102.2019.1620127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Most of the drugs binding to human serum albumin (HSA) are transported to various parts of the body. Here, we have studied the molecular interaction between HSA and synthesized uridine derivatives, 1-[(3R, 4S, 5 R)-2-methyl-3, 4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]pyrimidine-2,4-dion.)(C-MU); [(2R,3R,4R,5R)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3,4-dihydroxy-4-methyl-tetrahydrofuran-2-yl] methyl methyl phosphochloridate (CM-MU) and [(2R,3S,4R,5R)-5-(2,4-dioxopyrimidin-1-yl)-2-methyl-3,4-dihydroxyoxolan-2-yl] methyl dihydrogen phosphate (P-MU). Cytotoxic studies of these synthesized compounds with mouse macrophages (RAW 246.7) and HeLa cells (human cervical cancer cells) and binding mechanism of these uridine derivatives with HSA were performed. Subsequently, fluorescence quenching was observed upon titration of uridine derivatives with HSA via static mode of quenching, and the binding constants (K2-C-MU = 4 ± 0.03 × 104M-1, K5-CM-MU = 1.95 ± 0.03 × 104 M-1 and K5-P-MU =1.56 ± 0.03 × 104 M-1) were found to be in sync with the computational results. Further, molecular displacement and molecular docking data revealed that all the derivatives are binding in the subdomain IIA and IIB regions of HSA. The protein secondary structure of complexes was determined by circular dichroism, indicating partial unfolding of the protein upon addition of the uridine derivatives. Furthermore, atomic force microscopy data reveal the change in topology upon binding of 2-C-MU, 5-CM-MU and 5-P-MU with HSA, indicating change in the microenvironment around tryptophan region. Additionally, cytotoxicity studies on HeLa and Raw Cell lines suggested that these molecules have significant anti-proliferative and anti-inflammatory properties. Hence, the study may be of help for development of new drugs based on uridine derivatives which may be helpful for combating various potential diseases.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Shreya Dubey
- Department of Plant Science, School of Life Sciences, University of Hyderabad, Gachibowli, Telangana, India
| | - Suneel Kumar Madana
- Department of Chemistry, Periyar Maniammai Institute of Science & Technology, Thanjavur, India
| | - Monika Kallubai
- Department of Plant Science, School of Life Sciences, University of Hyderabad, Gachibowli, Telangana, India
| | - Arijit Sarkar
- Department of Plant Science, School of Life Sciences, University of Hyderabad, Gachibowli, Telangana, India
| | - Rajagopal Subramanyam
- Department of Plant Science, School of Life Sciences, University of Hyderabad, Gachibowli, Telangana, India
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Negrell C, Voirin C, Boutevin B, Ladmiral V, Caillol S. From monomer synthesis to polymers with pendant aldehyde groups. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2018.10.039] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kayastha AM, Srivastava PK, Miksa B, Slomkowski S. Unique Activity of Ureases Immobilized on Poly(Styrene-Co-Acrolein) Microspheres. J BIOACT COMPAT POL 2016. [DOI: 10.1177/0883911503018002002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Poly(styrene-co-acrolein) (P(S/A)) microspheres were synthesized by emulsifier-free emulsion-dispersion radical copolymerization of styrene and acrolein. Particles with a number average diameter ( øDn) of 373 nm, a narrow diameter distribution ( øDw/ øDn) of 1.008 and a surface concentration of aldehyde groups from polyacrolein units of 2.51 · 10−6 mol/m2 were obtained. Ureases from jack beans (Urs-JB) and from pigeonpea (Urs-PP) were immobilized onto these microspheres. Activity of free and immobilized urease was determined using a standard phenol method. Surface concentration of attached enzymes was varied in the range from 0.06 to 1.6 mg/m2. Specific activity of Urs-JB in solution was 1.9 times higher than that of Urs-PP, however, upon immobilization of enzymes onto P(S/A) microspheres the reverse was true. Due to very high denaturation activity of immobilized Urs-JB was 10 times lower than in solution. In the case of Urs-PP, denaturation of the enzyme upon immobilization was much lower and possibly due to a cooperative effect resulting from a local high concentration of immobilized enzyme, its specific activity was from 3 to 9 times higher than that of immobilized Urs-JB.
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Affiliation(s)
- Arvind M. Kayastha
- School of Biotechnology, Faculty of Science Banaras Hindu University, Varanasi - 221 005, India
| | - Punit K. Srivastava
- School of Biotechnology, Faculty of Science Banaras Hindu University, Varanasi - 221 005, India
| | - Beata Miksa
- Center of Molecular and Macromolecular Studies Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
| | - Stanislaw Slomkowski
- Center of Molecular and Macromolecular Studies Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
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Yeggoni DP, Rachamallu A, Subramanyam R. A comparative binding mechanism between human serum albumin and α-1-acid glycoprotein with corilagin: biophysical and computational approach. RSC Adv 2016. [DOI: 10.1039/c6ra06837e] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The interaction between corilagin and serum proteins was studied by biophysical and molecular dynamics techniques which in turn provides valuable information about the interaction of phytochemical corilagin with serum proteins.
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Affiliation(s)
| | | | - Rajagopal Subramanyam
- Department of Plant Sciences
- School of Life Sciences
- University of Hyderabad
- Hyderabad 500046
- India
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Investigation of the interaction between patulin and human serum albumin by a spectroscopic method, atomic force microscopy, and molecular modeling. BIOMED RESEARCH INTERNATIONAL 2014; 2014:734850. [PMID: 25110690 PMCID: PMC4119689 DOI: 10.1155/2014/734850] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 04/08/2014] [Indexed: 11/18/2022]
Abstract
The interaction of patulin with human serum albumin (HSA) was studied in vitro under normal physiological conditions. The study was performed using fluorescence, ultraviolet-visible spectroscopy (UV-Vis), circular dichroism (CD), atomic force microscopy (AFM), and molecular modeling techniques. The quenching mechanism was investigated using the association constants, the number of binding sites, and basic thermodynamic parameters. A dynamic quenching mechanism occurred between HSA and patulin, and the binding constants (K) were 2.60 × 10(4), 4.59 × 10(4), and 7.01 × 10(4) M(-1) at 288, 300, and 310 K, respectively. Based on fluorescence resonance energy transfer, the distance between the HSA and patulin was determined to be 2.847 nm. The ΔG (0), ΔH (0), and ΔS (0) values across various temperatures indicated that hydrophobic interaction was the predominant binding force. The UV-Vis and CD results confirmed that the secondary structure of HSA was altered in the presence of patulin. The AFM results revealed that the individual HSA molecule dimensions were larger after interaction with patulin. In addition, molecular modeling showed that the patulin-HSA complex was stabilized by hydrophobic and hydrogen bond forces. The study results suggested that a weak intermolecular interaction occurred between patulin and HSA. Overall, the results are potentially useful for elucidating the toxigenicity of patulin when it is combined with the biomolecular function effect, transmembrane transport, toxicological, testing and other experiments.
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Heller GT, Zwang TJ, Sarapata EA, Haber MA, Sazinsky MH, Radunskaya AE, Johal MS. Accounting for unintended binding events in the analysis of quartz crystal microbalance kinetic data. Colloids Surf B Biointerfaces 2014; 117:425-31. [PMID: 24704634 DOI: 10.1016/j.colsurfb.2014.02.044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2013] [Revised: 02/13/2014] [Accepted: 02/28/2014] [Indexed: 10/25/2022]
Abstract
Previous methods for analyzing protein-ligand binding events using the quartz crystal microbalance with dissipation monitoring (QCM-D) fail to account for unintended binding that inevitably occurs during surface measurements and obscure kinetic information. In this article, we present a system of differential equations that accounts for both reversible and irreversible unintended interactions. This model is tested on three protein-ligand systems, each of which has different features, to establish the feasibility of using the QCM-D for protein binding analysis. Based on this analysis, we were able to obtain kinetic information for the intended interaction that is consistent with those obtained in literature via bulk-phase methods. In the appendix, we include a method for decoupling these from the intended binding events and extracting relevant affinity information.
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Affiliation(s)
- Gabriella T Heller
- Chemistry Department, Pomona College, 645 North College Avenue, Claremont, CA 91711, United States
| | - Theodore J Zwang
- Chemistry Department, Pomona College, 645 North College Avenue, Claremont, CA 91711, United States
| | - Elizabeth A Sarapata
- Mathematics Department, Pomona College, 610 North College Avenue, Claremont, CA 91711, United States
| | - Michael A Haber
- Chemistry Department, Pomona College, 645 North College Avenue, Claremont, CA 91711, United States
| | - Matthew H Sazinsky
- Chemistry Department, Pomona College, 645 North College Avenue, Claremont, CA 91711, United States
| | - Ami E Radunskaya
- Mathematics Department, Pomona College, 610 North College Avenue, Claremont, CA 91711, United States
| | - Malkiat S Johal
- Chemistry Department, Pomona College, 645 North College Avenue, Claremont, CA 91711, United States.
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Exploring the binding of 4-thiothymidine with human serum albumin by spectroscopy, atomic force microscopy, and molecular modeling methods. Carbohydr Res 2014; 384:102-11. [DOI: 10.1016/j.carres.2013.11.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Revised: 11/21/2013] [Accepted: 11/27/2013] [Indexed: 11/15/2022]
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The interaction of 2-mercaptobenzimidazole with human serum albumin as determined by spectroscopy, atomic force microscopy and molecular modeling. Colloids Surf B Biointerfaces 2012; 104:311-7. [PMID: 23333916 DOI: 10.1016/j.colsurfb.2012.12.023] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2012] [Revised: 12/11/2012] [Accepted: 12/12/2012] [Indexed: 11/24/2022]
Abstract
The interaction of 2-mercaptobenzimidazole (MBI) with human serum albumin (HSA) was studied in vitro by equilibrium dialysis under normal physiological conditions. This study used fluorescence, ultraviolet-visible spectroscopy (UV-vis), Fourier transform infrared (FT-IR), circular dichroism (CD) and Raman spectroscopy, atomic force microscopy (AFM) and molecular modeling techniques. Association constants, the number of binding sites and basic thermodynamic parameters were used to investigate the quenching mechanism. Based on the fluorescence resonance energy transfer, the distance between the HSA and MBI was 2.495 nm. The ΔG(0), ΔH(0), and ΔS(0) values across temperature indicated that the hydrophobic interaction was the predominant binding Force. The UV, FT-IR, CD and Raman spectra confirmed that the HSA secondary structure was altered in the presence of MBI. In addition, the molecular modeling showed that the MBI-HSA complex was stabilized by hydrophobic forces, which resulted from amino acid residues. The AFM results revealed that the individual HSA molecule dimensions were larger after interaction with MBI. Overall, this study suggested a method for characterizing the weak intermolecular interaction. In addition, this method is potentially useful for elucidating the toxigenicity of MBI when it is combined with the biomolecular function effect, transmembrane transport, toxicological testing and other experiments.
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Slomkowski S, Basinska T, Miksa B. New types of microspheres and microsphere-related materials for medical diagnostics. POLYM ADVAN TECHNOL 2003. [DOI: 10.1002/pat.283] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Polyacrolein containing microspheres: Synthesis, properties and possible medical applications. Prog Polym Sci 1998. [DOI: 10.1016/s0079-6700(97)00053-1] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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