351
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Perez AA, Carrara CR, Sánchez CC, Rodríguez Patino JM, Santiago LG. Interactions between milk whey protein and polysaccharide in solution. Food Chem 2009. [DOI: 10.1016/j.foodchem.2009.02.017] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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352
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Investigation of the interaction between pentachlorophenol and human serum albumin using spectral methods. J Mol Struct 2009. [DOI: 10.1016/j.molstruc.2009.05.036] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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353
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Yan H, Zhao S, Yang J, Zhu X, Dai G, Liang H, Pan F, Weng L. Interaction Between Levamisole Hydrochloride and Bovine Serum Albumin and the Influence of Alcohol: Spectra. J SOLUTION CHEM 2009. [DOI: 10.1007/s10953-009-9438-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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354
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Shahabadi N, Maghsudi M. Binding studies of a new copper (II) complex containing mixed aliphatic and aromatic dinitrogen ligands with bovine serum albumin using different instrumental methods. J Mol Struct 2009. [DOI: 10.1016/j.molstruc.2009.04.027] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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355
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Cui F, Kong X, Qin L, Zhang G, Liu Q, Lei B, Yao X. Specific interaction of 4′-O-(a-l-Cladinosyl) daunorubicin with human serum albumin: The binding site II on HSA molecular using spectroscopy and modeling. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2009; 95:162-9. [DOI: 10.1016/j.jphotobiol.2009.03.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2008] [Revised: 02/25/2009] [Accepted: 03/02/2009] [Indexed: 11/16/2022]
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356
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Zhang YZ, Xiang X, Mei P, Dai J, Zhang LL, Liu Y. Spectroscopic studies on the interaction of Congo Red with bovine serum albumin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2009; 72:907-914. [PMID: 19155189 DOI: 10.1016/j.saa.2008.12.007] [Citation(s) in RCA: 107] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2008] [Revised: 12/04/2008] [Accepted: 12/09/2008] [Indexed: 05/27/2023]
Abstract
The binding interaction of Congo Red (CGR) with bovine serum albumin (BSA) was investigated by spectroscopic techniques including fluorescence spectroscopy, UV-vis absorption, and circular dichroism (CD) spectroscopy under simulative physiological conditions. Fluorescence data revealed that the fluorescence quenching of BSA by CGR was the result of the formation of a BSA-CGR complex, and the corresponding binding constants (K(a)) at the four different temperatures (292, 298, 304, and 310K) were obtained according to the modified Stern-Volmer equation. The thermodynamic parameters DeltaH and DeltaS were calculated to be -12.67kJmol(-1) and 58.60Jmol(-1)K(-1), respectively, which suggested that both hydrophobic force and hydrogen bond played major roles in stabilizing the BSA-CGR complex. Site marker competitive experiments showed that the binding of CGR to BSA primarily took place in site I of BSA. The distance r between CGR (acceptor) and tryptophan residues of BSA (donor) was calculated to be 3.89nm based on Förster's non-radioactive energy transfer theory. The conformational investigation showed that the presence of CGR resulted in the change of BSA secondary structure and induced the slight unfolding of the polypeptides of protein, which confirmed some micro-environmental and conformational changes of BSA molecules.
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Affiliation(s)
- Ye-Zhong Zhang
- Department of Chemistry, Yangtze University, Jingzhou, Hubei, PR China
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357
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Zhang YZ, Zhou B, Zhang XP, Huang P, Li CH, Liu Y. Interaction of malachite green with bovine serum albumin: determination of the binding mechanism and binding site by spectroscopic methods. JOURNAL OF HAZARDOUS MATERIALS 2009; 163:1345-1352. [PMID: 18786760 DOI: 10.1016/j.jhazmat.2008.07.132] [Citation(s) in RCA: 239] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2008] [Revised: 07/23/2008] [Accepted: 07/24/2008] [Indexed: 05/26/2023]
Abstract
The interaction between malachite green (MG) and bovine serum albumin (BSA) under simulative physiological conditions was investigated by the methods of fluorescence spectroscopy, UV-vis absorption and circular dichroism (CD) spectroscopy. Fluorescence data showed that the fluorescence quenching of BSA by MG was the result of the formation of the MG-BSA complex. According to the modified Stern-Volmer equation, the effective quenching constants (K(a)) between MG and BSA at four different temperatures were obtained to be 3.734 x 10(4), 3.264 x 10(4), 2.718 x 10(4), and 2.164 x 10(4)L mol(-1), respectively. The enthalpy change (Delta H) and entropy change (DeltaS) were calculated to be -27.25 kJ mol(-1) and -11.23 J mol(-1)K(-1), indicating that van der Waals force and hydrogen bonds were the dominant intermolecular force in stabilizing the complex. Site marker competitive experiments indicated that the binding of MG to BSA primarily took place in sub-domain IIA. The binding distance (r) between MG and the tryptophan residue of BSA was obtained to be 4.79 nm according to Förster theory of non-radioactive energy transfer. The conformational investigation showed that the presence of MG decreased the alpha-helical content of BSA (from 62.6% to 55.6%) and induced the slight unfolding of the polypeptides of protein, which confirmed some micro-environmental and conformational changes of BSA molecules.
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Affiliation(s)
- Ye-Zhong Zhang
- Department of Chemistry, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, Hubei 434023, China
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358
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Spectroscopic investigations of the binding interaction of a new indanedione derivative with human and bovine serum albumins. Molecules 2009; 14:1614-26. [PMID: 19396020 PMCID: PMC6254150 DOI: 10.3390/molecules14041614] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2009] [Revised: 04/15/2009] [Accepted: 04/20/2009] [Indexed: 11/17/2022] Open
Abstract
Binding of a newly synthesized indanedione derivative, 2-(2-hydroxy-3-ethoxybenzylidene)-1,3-indanedione (HEBID), to human and bovine serum albumins (HSA and BSA), under simulated physiological conditions was monitored by fluorescence spectroscopy. The binding parameters (binding constants and number of binding sites) and quenching constants were determined according to literature models. The quenching mechanism was assigned to a Förster non-radiative energy transfer due to the HEBID-SA complex formation. A slightly increased affinity of HEBID for HSA was found, while the number of binding sites is approximately one for both albumins. The molecular distance between donor (albumin) and acceptor (HEBID) and the energy transfer efficiency were estimated, in the view of Förster’s theory. The effect of HEBID on the protein conformation was investigated using circular dichroism and synchronous fluorescence spectroscopies. The results revealed partial unfolding in the albumins upon interaction, as well as changes in the local polarity around the tryptophan residues.
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359
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Wu XQ, Zhu WJ, Lü ZR, Xia Y, Yang JM, Zou F, Wang XY. The effect of rutin on arginine kinase: Inhibition kinetics and thermodynamics merging with docking simulation. Int J Biol Macromol 2009; 44:149-55. [DOI: 10.1016/j.ijbiomac.2008.11.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2008] [Revised: 11/15/2008] [Accepted: 11/17/2008] [Indexed: 11/25/2022]
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360
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Spectroscopic investigations on the mechanism of interaction of crystal violet with bovine serum albumin. J Mol Struct 2009. [DOI: 10.1016/j.molstruc.2008.09.028] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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361
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Monti S, Manet I, Manoli F, Ottani S, Marconi G. Licochalcone A bound to bovine serum albumin: a spectroscopic, photophysical and structural study. Photochem Photobiol Sci 2009; 8:805-13. [DOI: 10.1039/b823227j] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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362
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Ojha H, Murari BM, Anand S, Hassan MI, Ahmad F, Chaudhury NK. Interaction of DNA Minor Groove Binder Hoechst 33258 with Bovine Serum Albumin. Chem Pharm Bull (Tokyo) 2009; 57:481-6. [DOI: 10.1248/cpb.57.481] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Himanshu Ojha
- Division of Radiation Biosciences, Institute of Nuclear Medicine and Allied Sciences
| | | | - Sneh Anand
- Center for Biomedical Engineering, Indian Institute of Technology
| | | | - Faizan Ahmad
- Center for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia
| | - Nabo Kumar Chaudhury
- Division of Radiation Biosciences, Institute of Nuclear Medicine and Allied Sciences
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363
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Wang YQ, Tang BP, Zhang HM, Zhou QH, Zhang GC. Studies on the interaction between imidacloprid and human serum albumin: spectroscopic approach. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2008; 94:183-90. [PMID: 19126446 DOI: 10.1016/j.jphotobiol.2008.11.013] [Citation(s) in RCA: 121] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2008] [Revised: 11/03/2008] [Accepted: 11/12/2008] [Indexed: 11/26/2022]
Abstract
The interaction between imidacloprid (IMI) and human serum albumin (HSA) was investigated using fluorescence and UV/vis absorption spectroscopy. The experimental results showed that the fluorescence quenching of HSA by IMI was a result of the formation of IMI-HSA complex; static quenching was confirmed to result in the fluorescence quenching. The apparent binding constant K(A) between IMI and HSA at three differences were obtained to be 1.51 x 10(4), 1.58 x 10(4), and 2.19 x 10(4) L mol(-1), respectively. The thermodynamic parameters, DeltaH degrees and DeltaS degrees were estimated to be 28.44 kJ mol(-1), 174.76 J mol(-1) K(-1) according to the van't Hoff equation. Hydrophobic interactions played a major role in stabilizing the complex. The distance r between donor (HSA) and acceptor (IMI) was obtained according to fluorescence resonance energy transfer. The effect of IMI on the conformation of HSA was analyzed using synchronous fluorescence spectroscopy CD and three-dimensional fluorescence spectra, the environment around Trp and Tyr residues were altered.
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Affiliation(s)
- Yan-qing Wang
- Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection, Yancheng City, Jiangsu Province 224002, People's Republic of China.
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364
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Xu H, Liu Q, Wen Y. Spectroscopic studies on the interaction between nicotinamide and bovine serum albumin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008; 71:984-988. [PMID: 18373949 DOI: 10.1016/j.saa.2008.02.021] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2007] [Revised: 02/02/2008] [Accepted: 02/13/2008] [Indexed: 05/26/2023]
Abstract
The interaction of nicotinamide (NA) and bovine serum albumin (BSA) was studied by fluorescence and absorption spectroscopy at different temperatures. The results revealed that NA caused the fluorescence quenching of BSA through a static quenching procedure. The binding constants K(A), and the number of binding sites n, corresponding thermodynamic parameters DeltaG, DeltaH, DeltaS between NA and BSA at different temperatures were calculated. The primary binding pattern between NA and BSA was interpreted as hydrophobic interaction. In addition, the effect of NA on the conformation of BSA was analyzed using synchronous fluorescence spectroscopy. The binding average distance, r between the donor (BSA) and acceptor (NA) was determined based on the Förster's theory and it was found to be 3.1 nm.
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Affiliation(s)
- Hui Xu
- School of Chemistry and Materials Science, Ludong University, Yantai City, Shandong Province 264025, China.
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365
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366
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367
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Zhang G, Wang A, Jiang T, Guo J. Interaction of the irisflorentin with bovine serum albumin: A fluorescence quenching study. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2008.03.002] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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368
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Zhang YZ, Dai J, Zhang XP, Yang X, Liu Y. Studies of the interaction between Sudan I and bovine serum albumin by spectroscopic methods. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2007.11.043] [Citation(s) in RCA: 116] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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369
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Energetically favorable interactions between diclofenac sodium and cyclodextrin molecules in aqueous media. J Colloid Interface Sci 2008; 326:374-81. [DOI: 10.1016/j.jcis.2008.06.039] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2008] [Revised: 06/18/2008] [Accepted: 06/18/2008] [Indexed: 11/18/2022]
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370
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Wang N, Ye L, Zhao B, Yu J. Spectroscopic studies on the interaction of efonidipine with bovine serum albumin. Braz J Med Biol Res 2008; 41:589-95. [DOI: 10.1590/s0100-879x2008000700007] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2007] [Accepted: 06/18/2008] [Indexed: 11/22/2022] Open
Affiliation(s)
- N. Wang
- Capital Medical University, P.R. China
| | - L. Ye
- Capital Medical University, P.R. China
| | - B.Q. Zhao
- Capital Medical University, P.R. China
| | - J.X. Yu
- Capital Medical University, P.R. China
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371
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Hou HN, Qi ZD, OuYang YW, Liao FL, Zhang Y, Liu Y. Studies on interaction between Vitamin B12 and human serum albumin. J Pharm Biomed Anal 2008; 47:134-9. [DOI: 10.1016/j.jpba.2007.12.029] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2007] [Revised: 11/15/2007] [Accepted: 12/05/2007] [Indexed: 11/29/2022]
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372
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Kandagal PB, Kalanur SS, Manjunatha DH, Seetharamappa J. Mechanism of interaction between human serum albumin and N-alkyl phenothiazines studied using spectroscopic methods. J Pharm Biomed Anal 2008; 47:260-7. [PMID: 18313253 DOI: 10.1016/j.jpba.2008.01.027] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2007] [Revised: 12/28/2007] [Accepted: 01/03/2008] [Indexed: 11/16/2022]
Abstract
The binding characteristics of human serum albumin (HSA) with N-alkyl phenothiazines derivatives (NAP) viz., levomepromazine monomaleate (LMM) and propericiazine (PPC) have been studied by employing fluorescence, absorption, circular dichroism and FT-IR techniques. The Stern-Volmer quenching constant, K(SV) values were found to decrease with increase in temperature thereby indicating the presence of static quenching mechanism in the interactions of NAP with HSA. The number of binding sites, n and the binding constant, K were noticed to be, respectively, 1.11 and (5.188+/-0.034)x10(4) M(-1) for LMM and 1.06 and (4.436+/-0.066)x10(4) M(-1) for PPC at 298 K. The negative value of enthalpy change and positive value of entropy change in the present study indicated that the hydrophobic forces played a major role in the binding of NAP to HSA. The circular dichroism and FT-IR spectral data revealed the conformational changes in the structure of protein upon its interaction with NAP. The binding distances and the energy transfer efficiency between NAP and protein were determined based on Förster's theory of energy transfer. The decreased binding constants of HAS-LMM and HAS-PPC systems in presence of common ions indicated the availability of higher concentration of free drug in plasma.
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Affiliation(s)
- P B Kandagal
- Department of Chemistry, Karnatak University, Dharwad, India
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373
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MEI P, ZHANG LX, LIU Y, CAI LH, HU PZ. Fluorescence Quenching Study on the Interaction of Some Schiff Base Complexes with Bovine Serum Albumin. CHINESE J CHEM 2008. [DOI: 10.1002/cjoc.200890042] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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374
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Spectroscopic studies on the interaction of lanthanum(III) 2-oxo-propionic acid salicyloyl hydrazone complex with bovine serum albumin. LUMINESCENCE 2008; 23:150-6. [DOI: 10.1002/bio.1025] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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375
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Binding of puerarin to human serum albumin: a spectroscopic analysis and molecular docking. J Fluoresc 2007; 18:433-42. [PMID: 18058205 DOI: 10.1007/s10895-007-0283-0] [Citation(s) in RCA: 120] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2007] [Accepted: 11/12/2007] [Indexed: 10/22/2022]
Abstract
Puerarin is a widely used compound in Chinese traditional medicine and exhibits many pharmacological activities. Binding of puerarin to human serum albumin (HSA) was investigated by ultraviolet absorbance, fluorescence, circular dichroism and molecular docking. Puerarin caused a static quenching of intrinsic fluorescence of HSA, the quenching data was analyzed by Stern-Volmer equation. There was one primary puerarin binding site on HSA with a binding constant of 4.12 x 10(4) M(-1) at 298 K. Thermodynamic analysis by Van Hoff equation found enthalpy change (DeltaH(0)) and entropy change (DeltaS(0)) were -28.01 kJ/mol and -5.63 J/mol K respectively, which indicated the hydrogen bond and Van der Waas interaction were the predominant forces in the binding process. Competitive experiments showed a displacement of warfarin by puerarin, which revealed that the binding site was located at the drug site I. Puerarin was about 2.22 nm far from the tryptophan according to the observed fluorescence resonance energy transfer between HSA and puerarin. Molecular docking suggested the hydrophobic residues such as tyrosine (Tyr) 150, Tyr 148, Tyr 149 and polar residues such as lysine (Lys) 199, Lys 195, arginine 257 and histidine 242 played an important role in the binding reaction.
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376
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377
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Wang YQ, Zhang HM, Zhang GC, Tao WH, Fei ZH, Liu ZT. Spectroscopic studies on the interaction between silicotungstic acid and bovine serum albumin. J Pharm Biomed Anal 2007; 43:1869-75. [PMID: 17280811 DOI: 10.1016/j.jpba.2007.01.001] [Citation(s) in RCA: 140] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2006] [Revised: 12/29/2006] [Accepted: 01/02/2007] [Indexed: 10/23/2022]
Abstract
The interaction between silicotungstic acid and bovine serum albumin (BSA) was investigated using fluorescence and UV/vis. The experimental results showed that the fluorescence quenching of BSA by silicotungstic acid is a result of the formation of SiW-BSA complex; static quenching and non-radiative energy transferring were confirmed to result in the fluorescence quenching. The binding site number n, apparent binding constant K(A) and corresponding thermodynamic parameters were measured at different temperatures. The process of binding SiW molecule on BSA was a spontaneous molecular interaction procedure in which entropy increased and Gibbs free energy decreased. Hydrophobic interaction force plays a major role in stabilizing the complex. The effect of silicotungstic acid on the conformation of BSA was analyzed using synchronous fluorescence spectroscopy.
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Affiliation(s)
- Yan-Qing Wang
- Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection, Institute of Applied Chemistry and Environmental Engineering, Yancheng Normal College, Yancheng City, People's Republic of China.
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378
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379
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Hu YJ, Yu HG, Dong JX, Yang X, Liu Y. Spectroscopic studies on the interaction between 3,4,5-trimethoxybenzoic acid and bovine serum albumin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2006; 65:988-92. [PMID: 16679051 DOI: 10.1016/j.saa.2006.02.004] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2005] [Accepted: 02/01/2006] [Indexed: 05/09/2023]
Abstract
The interaction between 3,4,5-trimethoxybenzoic acid (TMBA) and bovine serum albumin (BSA) was studied by fluorescence and UV-vis absorption spectroscopy. In the mechanism discussion, it was proved that the fluorescence quenching of BSA by TMBA is a result of the formation of TMBA-BSA complex. Quenching constants were determined using the Stern-Volmer equation to provide a measure of the binding affinity between TMBA and BSA. The thermodynamic parameters DeltaH, DeltaG, DeltaS at different temperatures were calculated, and electrostatic interactions play an important role to stabilize the complex. The distance r between donor (BSA) and acceptor (TMBA) was obtained according to fluorescence resonance energy transfer (FRET).
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Affiliation(s)
- Yan-Jun Hu
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
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380
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Wang YQ, Zhang HM, Zhang GC. Studies of the interaction between palmatine hydrochloride and human serum albumin by fluorescence quenching method. J Pharm Biomed Anal 2006; 41:1041-6. [PMID: 16549318 DOI: 10.1016/j.jpba.2006.01.028] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2005] [Revised: 01/04/2006] [Accepted: 01/17/2006] [Indexed: 11/29/2022]
Abstract
The interaction between palmatine hydrochloride with human serum albumin (HSA) was investigated by fluorescence quenching technique and UV/vis absorption spectroscopy. The results of fluorescence titration revealed that palmatine hydrochloride could strongly quench the intrinsic fluorescence of HSA by static quenching and nonradiative energy transferring. The electrostatic interaction plays a major role in stabilizing the complex. The binding site number n and apparent binding constant KA, corresponding thermodynamic parameters DeltaG, DeltaH and DeltaS at different temperatures were calculated. The distance r between donor (HSA) and acceptor (palmatine hydrochloride) was obtained according to fluorescence resonance energy transfer. The effect of palmatine hydrochloride on the conformation of HSA was analyzed using synchronous fluorescence spectroscopy.
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Affiliation(s)
- Yan-Qing Wang
- Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection, Yancheng Teachers College, Yancheng City, Jiangsu Province 224002, People's Republic of China.
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