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Velmurugan P, Jonnalagadda RR, Unni Nair B. Engineering D-Amino Acid Containing Collagen Like Peptide at the Cleavage Site of Clostridium histolyticum Collagenase for Its Inhibition. PLoS One 2015; 10:e0124398. [PMID: 25973613 PMCID: PMC4431724 DOI: 10.1371/journal.pone.0124398] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Accepted: 03/13/2015] [Indexed: 02/02/2023] Open
Abstract
Collagenase is an important enzyme which plays an important role in degradation of collagen in wound healing, cancer metastasis and even in embryonic development. However, the mechanism of this degradation has not yet been completely understood. In the field of biomedical and protein engineering, the design and development of new peptide based materials is of main concern. In the present work an attempt has been made to study the effect of DAla in collagen like peptide (imino-poor region of type I collagen) on the structure and stability of peptide against enzyme hydrolysis. Effect of replacement of DAla in the collagen like peptide has been studied using circular dichroic spectroscopy (CD). Our findings suggest that, DAla substitution leads to conformational changes in the secondary structure and favours the formation of polyproline II conformation than its L-counterpart in the imino-poor region of collagen like peptides. Change in the chirality of alanine at the cleavage site of collagenase in the imino-poor region inhibits collagenolytic activity. This may find application in design of peptides and peptidomimics for enzyme-substrate interaction, specifically with reference to collagen and other extra cellular matrix proteins.
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Affiliation(s)
- Punitha Velmurugan
- Council of Scientific and Industrial Research—Central Leather Research Institute, Chemical Laboratory, Adyar, Chennai, 600 020, India
| | - Raghava Rao Jonnalagadda
- Council of Scientific and Industrial Research—Central Leather Research Institute, Chemical Laboratory, Adyar, Chennai, 600 020, India
- * E-mail:
| | - Balachandran Unni Nair
- Council of Scientific and Industrial Research—Central Leather Research Institute, Chemical Laboratory, Adyar, Chennai, 600 020, India
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52
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Xu X, Qian Y, Wu P, Zhang H, Cai C. Probing the anticancer-drug-binding-induced microenvironment alterations in subdomain IIA of human serum albumin. J Colloid Interface Sci 2015; 445:102-111. [DOI: 10.1016/j.jcis.2014.12.033] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Revised: 12/11/2014] [Accepted: 12/12/2014] [Indexed: 12/19/2022]
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53
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Wu H, Liu Y, Li M, Chong Y, Zeng M, Lo YM, Yin JJ. Size-dependent tuning of horseradish peroxidase bioreactivity by gold nanoparticles. NANOSCALE 2015; 7:4505-13. [PMID: 25684572 DOI: 10.1039/c4nr07056a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Molecules with diverse biological functions, such as heme peroxidases, can be useful tools for identifying potential biological effects of gold nanoparticles (AuNPs) at the molecular level. Here, using UV-Vis, circular dichroism, dynamic light scattering, and electron spin resonance spectroscopy, we report tuning of horseradish peroxidase (HRP) bioactivity by reactant-free AuNPs with diameters of 5, 10, 15, 30 and 60 nm (Au-5 nm, Au-10 nm, Au-15 nm, Au-30 nm and Au-60 nm). HRP conjugation to AuNPs was observed with only Au-5 nm and Au-10 nm prominently increasing the α-helicity of the enzyme to extents inversely related to their size. Au-5 nm inhibited both HRP peroxidase activity toward 3,3',5,5'-tetramethylbenzidine and HRP compound I/II reactivity toward 5,5-dimethyl-1-pyrroline N-oxide. Au-5 nm enhanced the HRP peroxidase activity toward ascorbic acid and the HRP compound I/II reactivity toward redox-active residues in the HRP protein moiety. Further, Au-5 nm also decreased the catalase- and oxidase-like activities of HRP. Au-10 nm showed similar, but weaker effects, while Au-15 nm, Au-30 nm and Au-60 nm had no effect. Results suggest that AuNPs can size-dependently enhance or inhibit HRP bioreactivity toward substrates with different redox potentials via a mechanism involving extension of the HRP substrate access channel and decline in the redox potentials of HRP catalytic intermediates.
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Affiliation(s)
- Haohao Wu
- College of Food Science and Engineering, Ocean University of China, 5 Yushan Road, Qingdao, Shandong Province 266003, China
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Yuan X, Gu W, Xiao M, Xie W, Wei S, Zhou L, Zhou J, Shen J. Interactions of CT DNA with hexagonal NaYF4 co-doped with Yb(3+)/Tm(3+) upconversion particles. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 137:995-1003. [PMID: 25305602 DOI: 10.1016/j.saa.2014.08.087] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Revised: 07/30/2014] [Accepted: 08/24/2014] [Indexed: 06/04/2023]
Abstract
The interaction of UCPs with CT DNA are studied in detail by zeta potential, Energy dispersive spectrometer (EDS) spectroscopy, Thermogravimetric (TGA) analysis, DNA melting determination and various spectroscopic techniques including Ultraviolet-Visible (UV-Vis) absorption, fluorescence, circular dichroism (CD), Fourier transform infrared (FTIR) and Raman spectroscopy. The results indicate that CT DNA can assemble on the surface of UCPs mainly by relative stronger hydrophobic force and electrostatic binding, and the predominant interaction site is the deoxyribosyl phosphate backbone of CT DNA. Moreover, after interacting with UCPs, the double helix structure of DNA is undamaged.
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Affiliation(s)
- Xiuxue Yuan
- College of Chemistry and Materials Science, Analysis and Testing Centre, Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, Key Laboratory of Applied Photochemistry, Nanjing Normal University, China
| | - Wenchao Gu
- College of Chemistry and Materials Science, Analysis and Testing Centre, Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, Key Laboratory of Applied Photochemistry, Nanjing Normal University, China
| | - Mengsi Xiao
- College of Chemistry and Materials Science, Analysis and Testing Centre, Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, Key Laboratory of Applied Photochemistry, Nanjing Normal University, China
| | - Wenli Xie
- College of Chemistry and Materials Science, Analysis and Testing Centre, Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, Key Laboratory of Applied Photochemistry, Nanjing Normal University, China
| | - Shaohua Wei
- College of Chemistry and Materials Science, Analysis and Testing Centre, Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, Key Laboratory of Applied Photochemistry, Nanjing Normal University, China
| | - Lin Zhou
- College of Chemistry and Materials Science, Analysis and Testing Centre, Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, Key Laboratory of Applied Photochemistry, Nanjing Normal University, China.
| | - Jiahong Zhou
- College of Chemistry and Materials Science, Analysis and Testing Centre, Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, Key Laboratory of Applied Photochemistry, Nanjing Normal University, China.
| | - Jian Shen
- College of Chemistry and Materials Science, Analysis and Testing Centre, Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, Key Laboratory of Applied Photochemistry, Nanjing Normal University, China
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55
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Liu F, Wang L, Wang H, Yuan L, Li J, Brash JL, Chen H. Modulating the activity of protein conjugated to gold nanoparticles by site-directed orientation and surface density of bound protein. ACS APPLIED MATERIALS & INTERFACES 2015; 7:3717-24. [PMID: 25621371 DOI: 10.1021/am5084545] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The key property of protein-nanoparticle conjugates is the bioactivity of the protein. The ability to accurately modulate the activity of protein on the nanoparticles at the interfaces is important in many applications. In the work reported here, modulation of the activity of protein-gold nanoparticle (AuNP) conjugates by specifically orienting the protein and by varying the surface density of the protein was investigated. Different orientations were achieved by introducing cysteine (Cys) residues at specific sites for binding to gold. We chose Escherichia coli inorganic pyrophosphatase (PPase) as a model protein and used site-directed mutagenesis to generate two mutant types (MTs) with a single Cys residue on the surface: MT1 with Cys near the active center and MT2 with Cys far from the active center. The relative activities of AuNP conjugates with wild type (WT), MT1, and MT2 were found to be 44.8%, 68.8%, and 91.2% of native PPase in aqueous solution. Site-directed orientation with the binding site far from the active center thus allowed almost complete preservation of the protein activity. The relative activity of WT and MT2 conjugates did not change with the surface density of the protein, while that of MT1 increased significantly with increasing surface density. These results demonstrate that site-directed orientation and surface density can both modulate the activity of proteins conjugated to AuNP and that orientation has a greater effect than density. Furthermore, increasing the surface density of the specifically oriented protein MT2, while having no significant effect on the specific activity of the protein, still allowed increased protein loading on the AuNP and thus increased the total protein activity. This is of great importance in the study on the interface of protein and nanoparticle and the applications for enzyme immobilization, drug delivery, and biocatalysis.
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Affiliation(s)
- Feng Liu
- The Key Lab of Health Chemistry and Molecular Diagnosis of Suzhou, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, P. R. China
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56
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Shanmugaraj K, Anandakumar S, Ilanchelian M. Unraveling the binding interaction of Toluidine blue O with bovine hemoglobin – a multi spectroscopic and molecular modeling approach. RSC Adv 2015. [DOI: 10.1039/c4ra11136b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Toluidine blue O (TBO) is a cationic photosensitizer that belongs to the class of phenothiazinium dyes.
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57
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Novel blue-emitting gold nanoclusters confined in human hemoglobin, and their use as fluorescent probes for copper(II) and histidine. Mikrochim Acta 2014. [DOI: 10.1007/s00604-014-1428-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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58
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Zhan K, Liu H, Zhang H, Chen Y, Ni H, Wu M, Sun D, Chen Y. A facile method for the immobilization of myoglobin on multi-walled carbon nanotubes: Poly(methacrylic acid-co-acrylamide) nanocomposite and its application for direct bio-detection of H2O2. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2014.04.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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59
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Yang JA, Lin W, Woods WS, George JM, Murphy CJ. α-Synuclein’s Adsorption, Conformation, and Orientation on Cationic Gold Nanoparticle Surfaces Seeds Global Conformation Change. J Phys Chem B 2014; 118:3559-71. [DOI: 10.1021/jp501114h] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Jie An Yang
- Department
of Chemistry, University of Illinois at Urbana−Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Wayne Lin
- Department
of Chemistry, University of Illinois at Urbana−Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Wendy S. Woods
- Department
of Bioengineering, University of Illinois at Urbana−Champaign, 1304 West Springfield Avenue, Urbana, Illinois 61801, United States
| | - Julia M. George
- School
of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom
| | - Catherine J. Murphy
- Department
of Chemistry, University of Illinois at Urbana−Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
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60
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Shanmugaraj K, Anandakumar S, Ilanchelian M. Exploring the biophysical aspects and binding mechanism of thionine with bovine hemoglobin by optical spectroscopic and molecular docking methods. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2014; 131:43-52. [DOI: 10.1016/j.jphotobiol.2014.01.001] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Revised: 12/19/2013] [Accepted: 01/05/2014] [Indexed: 10/25/2022]
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61
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Direct electrochemistry of hemoglobin immobilized on the water-soluble phosphonate functionalized multi-walled carbon nanotubes and its application to nitric oxide biosensing. Talanta 2013; 115:228-34. [DOI: 10.1016/j.talanta.2013.03.088] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2012] [Revised: 03/05/2013] [Accepted: 03/07/2013] [Indexed: 11/23/2022]
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62
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63
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Liu H, Cui Y, Li P, Zhou Y, Chen Y, Tang Y, Lu T. Polyphosphonate induced coacervation of chitosan: Encapsulation of proteins/enzymes and their biosensing. Anal Chim Acta 2013; 776:24-30. [DOI: 10.1016/j.aca.2013.03.040] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Revised: 03/14/2013] [Accepted: 03/16/2013] [Indexed: 02/07/2023]
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64
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Protein structure preservation by MWCNTs/RTIL nano-composite. Int J Biol Macromol 2013; 56:169-74. [DOI: 10.1016/j.ijbiomac.2013.02.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Revised: 02/02/2013] [Accepted: 02/04/2013] [Indexed: 11/18/2022]
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65
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Yang JA, Johnson BJ, Wu S, Woods WS, George JM, Murphy CJ. Study of wild-type α-synuclein binding and orientation on gold nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:4603-15. [PMID: 23477540 DOI: 10.1021/la400266u] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The disruption of α-synuclein (α-syn) homeostasis in neurons is a potential cause of Parkinson's disease, which is manifested pathologically by the appearance of α-syn aggregates, or Lewy bodies. Treatments for neurological diseases are extremely limited. To study the potential use of gold nanoparticles (Au NPs) to limit α-syn misfolding, the binding and orientation of α-syn on Au NPs were investigated. α-Syn was determined to interact with 20 and 90 nm Au NPs via multilayered adsorption: a strong electrostatic interaction between α-syn and Au NPs in the hard corona and a weaker noncovalent protein-protein interaction in the soft corona. Spectroscopic and light-scattering titrations led to the determinations of binding constants for the Au NP α-syn coronas: for the hard corona on 20 nm Au NPs, the equilibrium association constant was 2.9 ± 1.1 × 10(9) M(-1) (for 360 ± 70 α-syn/NP), and on 90 nm Au NPs, the hard corona association constant was 9.5 ± 0.8 × 10(10) M(-1) (for 5300 ± 700 α-syn/NP). The binding of the soft corona was thermodynamically unfavorable and kinetically driven and was in constant exchange with "free" α-syn in solution. A protease digestion method was used to deduce the α-syn orientation and structure on Au NPs, revealing that α-syn absorbs onto negatively charged Au NPs via its N-terminus while apparently retaining its natively unstructured conformation. These results suggest that Au NPs could be used to sequester and regulate α-syn homeostasis.
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Affiliation(s)
- Jie An Yang
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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66
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Graphene oxide-induced conformation changes of glucose oxidase studied by infrared spectroscopy. Colloids Surf B Biointerfaces 2013; 109:115-20. [PMID: 23624279 DOI: 10.1016/j.colsurfb.2013.03.033] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2012] [Revised: 03/07/2013] [Accepted: 03/19/2013] [Indexed: 12/20/2022]
Abstract
The adsorption of proteins on the surface of nanomaterials can induce changes in the structure and biological activity of the proteins. Although there have been a number of studies aimed at developing an understanding of the interactions of proteins with surfaces of nanomaterials, a detailed description of the actual state of the adsorbed proteins or the functional consequences of protein adsorption onto nanomaterials has yet to be reported. In this study, the conformation changes of glucose oxidase (GOx) induced by adsorption on graphene oxide (GO) sheets were investigated by quantitative second-derivative infrared analysis and two-dimensional infrared correlation spectroscopy (2D IR). The adsorption of GOx on GO sheets resulted in the conversion of α-helix to β-sheet structures and therefore led to substantial conformation changes of GOx, even the unfolding of the protein. These alterations in the conformation of GOx caused a significant decrease in the catalytic activity of the enzyme for glucose oxidation. This study demonstrates that nanomaterials can strongly influence the conformation and activity of adsorbed proteins. In addition to the importance of this effect in cases of the direct adsorption of proteins on nanomaterials, the results have implications for proteins adsorbed on materials with nanometer-scale surface roughness.
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67
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Qian Y, Xu X, Wang Q, Wu P, Zhang H, Cai C. Electrochemical probing of the solution pH-induced structural alterations around the heme group in myoglobin. Phys Chem Chem Phys 2013; 15:16941-8. [DOI: 10.1039/c3cp52352g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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68
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Electrocatalytic oxidation of tyrosines shows signal enhancement in label-free protein biosensors. Trends Analyt Chem 2012. [DOI: 10.1016/j.trac.2012.07.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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69
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Tang J, Yang C, Zhou L, Ma F, Liu S, Wei S, Zhou J, Zhou Y. Studies on the binding behavior of prodigiosin with bovine hemoglobin by multi-spectroscopic techniques. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 96:461-467. [PMID: 22728237 DOI: 10.1016/j.saa.2012.05.059] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2012] [Revised: 05/17/2012] [Accepted: 05/26/2012] [Indexed: 06/01/2023]
Abstract
In this article, the interaction mechanism of prodigiosin (PG) with bovine hemoglobin (BHb) is studied in detail using various spectroscopic technologies. UV-vis absorption and fluorescence spectra demonstrate the interaction process. The Stern-Volmer plot and the time-resolved fluorescence study suggest the quenching mechanism of fluorescence of BHb by PG is a static quenching procedure, and the hydrophobic interactions play a major role in binding of PG to BHb. Furthermore, synchronous fluorescence studies, Fourier transform infrared (FTIR) and circular dichroism (CD) spectra reveal that the conformation of BHb is changed after conjugation with PG.
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Affiliation(s)
- Jing Tang
- College of Chemistry and Materials Science, Analysis and Testing Center, Jiangsu Key Laboratory of Biofunctional Materials, Nanjing Normal University, Nanjing 210046, PR China
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70
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Computational, electrochemical, and spectroscopic, studies of acetycholinesterase covalently attached to carbon nanotubes. Colloids Surf B Biointerfaces 2012; 103:624-9. [PMID: 23274156 DOI: 10.1016/j.colsurfb.2012.08.039] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Revised: 08/21/2012] [Accepted: 08/27/2012] [Indexed: 11/22/2022]
Abstract
This manuscript describes results related to the characterization of electrodes modified with a composite of acetylcholinesterase covalently bound to carbon nanotubes (CNT). The characterization was performed by computational methods and complemented by cyclic voltammetry, infrared spectroscopy, and electrochemical impedance spectroscopy. In-silico simulations enabled the identification of the binding site and the calculation of the interaction energy. Besides complementing the computational studies, experimental results obtained by cyclic voltammetry showed that the addition of CNT to the surface of electrodes yielded significant increases in effective area and greatly facilitated the electron transfer reactions. These results are also in agreement with impedance spectroscopy data, which indicated a high apparent rate constant, even after the immobilization of the enzyme. These results lend new information about the physical and chemical properties of biointerfaces at the molecular level, specifically about the mechanism and consequences of the interaction of a model enzyme with CNT.
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71
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Park SJ, Khang D. Conformational changes of fibrinogen in dispersed carbon nanotubes. Int J Nanomedicine 2012; 7:4325-33. [PMID: 22915854 PMCID: PMC3419504 DOI: 10.2147/ijn.s33696] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2012] [Indexed: 11/23/2022] Open
Abstract
The conformational changes of plasma protein structures in response to carbon nanotubes are critical for determining the nanotoxicity and blood coagulation effects of carbon nanotubes. In this study, we identified that the functional intensity of carboxyl groups on carbon nanotubes, which correspond to the water dispersity or hydrophilicity of carbon nanotubes, can induce conformational changes in the fibrinogen domains. Also, elevation of carbon nanotube density can alter the secondary structures (ie, helices and beta sheets) of fibrinogen. Furthermore, fibrinogen that had been in contact with the nanoparticle material demonstrated a different pattern of heat denaturation compared with free fibrinogen as a result of a variation in hydrophilicity and concentration of carbon nanotubes. Considering the importance of interactions between carbon nanotubes and plasma proteins in the drug delivery system, this study elucidated the correlation between nanoscale physiochemical material properties of carbon nanotubes and associated structural changes in fibrinogen.
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Affiliation(s)
- Sung Jean Park
- College of Pharmacy, Gachon University, Yeonsu-gu, Incheon, South Korea
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72
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Shao Q, Wu P, Xu X, Zhang H, Cai C. Insight into the effects of graphene oxide sheets on the conformation and activity of glucose oxidase: towards developing a nanomaterial-based protein conformation assay. Phys Chem Chem Phys 2012; 14:9076-85. [PMID: 22641400 DOI: 10.1039/c2cp40654c] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Protein conformation associates with particular properties of proteins and relates to protein-mediated diseases. Detailed elucidation of secondary and tertiary formation, stability, and the structural and dynamic properties of proteins has been one of the main topics studied in chemistry and biology. In this work, the conformation changes in glucose oxidase (GOx) induced by the graphene oxide (GO) sheets were studied in detail by various spectroscopic techniques including ultraviolet-visible (UV-vis) absorption, fluorescence, and circular dichroism (CD) spectroscopy. The results indicated that GOx underwent substantial conformation changes after assembling on the surface of GO. The interaction of GOx with GO could induce the exposure of the FAD (flavin adenine dinucleotide) moiety to solvent and transfer tryptophan (Trp) residues to a more hydrophobic environment. The calculation from CD spectra showed that GO could induce the conversion of α-helix to β-sheet structures, even unfolding of the protein. These alterations in the conformation of GOx resulted in a significant decrease in the catalytic activity of the enzyme in glucose oxidation. The possible reasons for these conformation changes in GOx are also discussed. This work not only provides insight into the interaction between atomically flat graphitic structures and various biological systems but also creates a framework for analyzing the biosafety of nanomaterials in terms of the biological behavior of biomacromolecules. The results obtained here can direct the further applications of the nanomaterials.
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Affiliation(s)
- Qian Shao
- Jiangsu Key Laboratory of New Power Batteries, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210097, China
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73
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Li P, Liu H, Ding Y, Wang Y, Chen Y, Zhou Y, Tang Y, Wei H, Cai C, Lu T. Synthesis of water-soluble phosphonate functionalized single-walled carbon nanotubes and their applications in biosensing. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31350b] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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74
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Song Y, Luo D, Ye S, Huang M, Zhong D, Huang Z, Hou H, Wang L. Spectroscopic studies on the interaction between EcoRI and CdS QDs and conformation of EcoRI in EcoRI-CdS QDs bioconjugates. Phys Chem Chem Phys 2012; 14:16258-66. [DOI: 10.1039/c2cp42562a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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75
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Xu X, Wu P, Xu W, Shao Q, An L, Zhang H, Cai C, Zhao B. Effects of guanidinium ions on the conformational structure of glucose oxidase studied by electrochemistry, spectroscopy, and theoretical calculations: towards developing a chemical-induced protein conformation assay. Phys Chem Chem Phys 2012; 14:5824-36. [DOI: 10.1039/c2cp24121h] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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