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Quan H, Hu Y, Huang Z, Wenmeng D. Preparation and property evaluation of a hydrophobically modified xanthan gum XG-C16. J DISPER SCI TECHNOL 2019. [DOI: 10.1080/01932691.2019.1610425] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Hongping Quan
- Southwest Petroleum University, Chengdu, China
- Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province
| | - Yuling Hu
- Southwest Petroleum University, Chengdu, China
- Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province
| | - Zhiyu Huang
- Southwest Petroleum University, Chengdu, China
- Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province
| | - Duan Wenmeng
- Southwest Petroleum University, Chengdu, China
- Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province
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2
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A biophysical investigation on the binding of proflavine with human hemoglobin: Insights from spectroscopy, thermodynamics and AFM studies. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2016; 165:42-50. [DOI: 10.1016/j.jphotobiol.2016.10.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 09/26/2016] [Accepted: 10/11/2016] [Indexed: 12/27/2022]
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3
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Ding F, Peng W. Biological assessment of neonicotinoids imidacloprid and its major metabolites for potentially human health using globular proteins as a model. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2015; 147:24-36. [DOI: 10.1016/j.jphotobiol.2015.03.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2014] [Revised: 02/13/2015] [Accepted: 03/05/2015] [Indexed: 12/27/2022]
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4
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Picosecond time-resolved fluorescent spectroscopy of 1-anilino-8-naphthalene sulfonate binding with staphylococcal nuclease in the native and molten globule states. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2015; 145:60-5. [DOI: 10.1016/j.jphotobiol.2015.02.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Revised: 02/04/2015] [Accepted: 02/25/2015] [Indexed: 11/21/2022]
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5
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Barros AE, Carvalho FA, Alves FR, Carvalho JW, Tabak M. Denaturant effects on HbGp hemoglobin as monitored by 8-anilino-1-naphtalene-sulfonic acid (ANS) probe. Int J Biol Macromol 2015; 74:327-36. [DOI: 10.1016/j.ijbiomac.2014.12.035] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 12/17/2014] [Accepted: 12/18/2014] [Indexed: 10/24/2022]
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6
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Application of ANS fluorescent probes to identify hydrophobic sites on the surface of DREAM. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2014; 1844:1472-80. [PMID: 24854592 DOI: 10.1016/j.bbapap.2014.05.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Revised: 05/01/2014] [Accepted: 05/12/2014] [Indexed: 11/23/2022]
Abstract
DREAM (calsenilin or KChIP-3) is a calcium sensor involved in regulation of diverse physiological processes by interactions with multiple intracellular partners including DNA, Kv4 channels, and presenilin, however the detailed mechanism of the recognition of the intracellular partners remains unclear. To identify the surface hydrophobic surfaces on apo and Ca(2+)DREAM as a possible interaction sites for target proteins and/or specific regulators of DREAM function the binding interactions of 1,8-ANS and 2,6-ANS with DREAM were characterized by fluorescence and docking studies. Emission intensity of ANS-DREAM complexes increases upon Ca(2+) association which is consistent with an overall decrease in surface polarity. The dissociation constants for ANS binding to apoDREAM and Ca(2+)DREAM were determined to be 195±20μM and 62±4μM, respectively. Fluorescence lifetime measurements indicate that two ANS molecules bind in two independent binding sites on DREAM monomer. One site is near the exiting helix of EF-4 and the second site is located in the hydrophobic crevice between EF-3 and EF-4. 1,8-ANS displacement studies using arachidonic acid demonstrate that the hydrophobic crevice between EF-3 and EF-4 serves as a binding site for fatty acids that modulate functional properties of Kv4 channel:KChIP complexes. Thus, the C-terminal hydrophobic crevice may be involved in DREAM interactions with small hydrophobic ligands as well as other intracellular proteins.
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7
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Hazra S, Suresh Kumar G. Structural and Thermodynamic Studies on the Interaction of Iminium and Alkanolamine Forms of Sanguinarine with Hemoglobin. J Phys Chem B 2014; 118:3771-84. [DOI: 10.1021/jp409764z] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Soumitra Hazra
- Biophysical Chemistry Laboratory,
Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Kolkata 700 032, India
| | - Gopinatha Suresh Kumar
- Biophysical Chemistry Laboratory,
Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Kolkata 700 032, India
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8
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Roy A, Comesse S, Grisel M, Hucher N, Souguir Z, Renou F. Hydrophobically Modified Xanthan: An Amphiphilic but Not Associative Polymer. Biomacromolecules 2014; 15:1160-70. [DOI: 10.1021/bm4017034] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Audrey Roy
- University of
Le Havre, URCOM, EA 3221, FR CNRS 3038, 25 rue Philippe Lebon, B.P. 540, 76058 Le Havre Cedex, France
| | - Sébastien Comesse
- University of
Le Havre, URCOM, EA 3221, FR CNRS 3038, 25 rue Philippe Lebon, B.P. 540, 76058 Le Havre Cedex, France
| | - Michel Grisel
- University of
Le Havre, URCOM, EA 3221, FR CNRS 3038, 25 rue Philippe Lebon, B.P. 540, 76058 Le Havre Cedex, France
| | - Nicolas Hucher
- University of
Le Havre, URCOM, EA 3221, FR CNRS 3038, 25 rue Philippe Lebon, B.P. 540, 76058 Le Havre Cedex, France
| | - Zied Souguir
- Laboratoire
Polymeres Biopolymeres Surfaces, University of Rouen, F-76821 Mont St. Aignan, France
| | - Frédéric Renou
- University of
Le Havre, URCOM, EA 3221, FR CNRS 3038, 25 rue Philippe Lebon, B.P. 540, 76058 Le Havre Cedex, France
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9
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Kamal MZ, Ali J, Rao NM. Binding of bis-ANS to Bacillus subtilis lipase: a combined computational and experimental investigation. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2013; 1834:1501-9. [PMID: 23639749 DOI: 10.1016/j.bbapap.2013.04.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Revised: 04/18/2013] [Accepted: 04/21/2013] [Indexed: 12/19/2022]
Abstract
8-Anilino-1-naphthalene sulfonate (ANS) and its covalent dimer bis-ANS are widely used for titrating hydrophobic surfaces of proteins. Interest to understand the nature of interaction of these dyes with proteins was seriously pursued. However as the techniques used in these studies varied, they often provided varied information regarding stoichiometry, binding affinity, actual binding sites etc. In the present study, we used combination of computation methods (docking and MD simulation) and experimental methods (mutations, steady-state and time-resolved fluorescence) to investigate bis-ANS interaction with Bacillus subtilis lipase. We identified seven binding sites for bis-ANS on lipase using computational docking and MD simulation and verified these data using a set of single amino acid substituted mutants. Docking and MD simulation studies indicated that the binding sites were various indentations and grooves on protein surface with hydrophobic characteristics. Both hydrophobic and ionic interactions were involved in each of these binding events. We further examine the fluorescence properties of bis-ANS bound to mutant lipases that either gained or lost a binding site. Our results indicated that neither gain nor loss of single binding site caused any change in fluorescence lifetimes (and their relative amplitudes) of mutant lipase-bound bis-ANS in comparison to that bound to wild type; hence, it suggested that nature of bis-ANS binding to each of the sites in lipase was very similar.
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Affiliation(s)
- Md Zahid Kamal
- Centre for Cellular and Molecular Biology, Council of Scientific and Industrial Research, Hyderabad, India.
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10
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Padalkar VS, Patil VS, D. Telore R, Sekar N. Synthesis of novel fluorescent 1,3,5-trisubstituted triazine derivatives and photophysical property evaluation of fluorophores and their BSA conjugates. HETEROCYCL COMMUN 2012. [DOI: 10.1515/hc-2012-0024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
AbstractCyanuric chloride was allowed to react with
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11
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Dsouza RN, Pischel U, Nau WM. Fluorescent dyes and their supramolecular host/guest complexes with macrocycles in aqueous solution. Chem Rev 2011; 111:7941-80. [PMID: 21981343 DOI: 10.1021/cr200213s] [Citation(s) in RCA: 797] [Impact Index Per Article: 61.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Roy N Dsouza
- School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, D-28759 Bremen, Germany
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12
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Togashi DM, Ryder AG. Time-resolved fluorescence studies on bovine serum albumin denaturation process. J Fluoresc 2005; 16:153-60. [PMID: 16382334 DOI: 10.1007/s10895-005-0029-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2005] [Accepted: 10/24/2005] [Indexed: 10/25/2022]
Abstract
The denaturation of Bovine Serum Albumin (BSA) by a chaotropic agent, guanidinium hydrochloride (GuH+Cl-) was studied by fluorescence lifetime analysis. The BSA was labelled with 1-anilino-8-naphthalene sulfonate (ANS) at two different molar ratios (1:1) and (1:10). The non-exponential fluorescence kinetics of the BSA-ANS complex at different stages of denaturation is analysed using three different models: a discrete tri-exponential sum, stretched exponential, and Gaussian lifetime distribution. In all cases, the fluorescence decay times decreased with protein denaturation. The results from the models show that there are at least two different binding sites located in the BSA protein with different water accessibility.
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Affiliation(s)
- Denisio M Togashi
- Department of Chemistry and National Centre for Biomedical Engineering Science, National University of Ireland, Galway, Ireland.
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13
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Sharma B, Deo SK, Bachas LG, Daunert S. Competitive Binding Assay Using Fluorescence Resonance Energy Transfer for the Identification of Calmodulin Antagonists. Bioconjug Chem 2005; 16:1257-63. [PMID: 16173806 DOI: 10.1021/bc050161y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The ubiquitous calcium regulating protein calmodulin (CaM) has been utilized as a model drug target in the design of a competitive binding fluorescence resonance energy transfer assay for pharmacological screening. The protein was labeled by covalently attaching the thiol-reactive fluorophore, N-[2-(1-maleimidyl)ethyl]-7-(diethylamino)coumarin-3-carboxamide (MDCC) to an engineered C-terminal cysteine residue. Binding of the environmentally sensitive hydrophobic probe 2,6-anilinonaphthalene sulfonate (2,6-ANS) to CaM could be monitored by an increase in the fluorescence emission intensity of the 2,6-ANS. Evidence of fluorescence resonance energy transfer (FRET) from 2,6-ANS (acting as a donor) to MDCC (the acceptor in this system) was also observed; fluorescence emission representative of MDCC could be seen after samples were excited at a wavelength specific for 2,6-ANS. The FRET signal was monitored as a function of the concentration of calmodulin antagonists in solution. Calibration curves for both a selection of small molecules and a series of peptides based upon known CaM-binding domains were obtained using this system. The assay demonstrated dose-dependent antagonism by analytes known to hinder the biological activity of CaM. These data indicate that the presence of molecules known to bind CaM interfere with the ability of FRET to occur, thus leading to a concentration-dependent decrease of the ratio of acceptor:donor fluorescence emission. This assay can serve as a general model for the development of other protein binding assays intended to screen for molecules with preferred binding activity.
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Affiliation(s)
- Bethel Sharma
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, Kentucky 40536-0082, USA
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Syakhovich VE, Parul DA, Ruta EY, Bushuk BA, Bokut SB. 1,8-Anilinonaphthalene sulfonate binds to central cavity of human hemoglobin. Biochem Biophys Res Commun 2004; 317:761-7. [PMID: 15081405 DOI: 10.1016/j.bbrc.2004.03.111] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2004] [Indexed: 11/29/2022]
Abstract
Binding of 1,8-anilinonaphthalene sulfonate (1,8-ANS) to main (HbA(1)) and glycosylated (HbA(1C)) forms of human oxyhemoglobin in the presence/absence of inositolhexaphosphate (IHP) in 50 mM potassium phosphate buffer, pH 7.4, was studied by time-correlated single photon counter with subnanosecond time resolution. The redistribution of contributions of the most long-lived and the most short-lived fluorescent decay components in the presence of IHP provides an evidence of the probe binding within oxyhemoglobin central cavity, namely DPG-binding site. Finally, it was shown that the fluorescent probe is extremely sensitive for hemoglobin central cavity modification, provided by the carbohydrate moiety in case of 1,8-ANS interactions with HbA(1C).
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Affiliation(s)
- Vitaly E Syakhovich
- International Sakharov Environmental University, Dolgobrodskaya St. 23, Minsk 220009, Belarus
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15
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Synthesis and spectroscopic characterisation of 2-(2′-hydroxyphenyl)benzazole isothiocyanates as new fluorescent probes for proteins. J Photochem Photobiol A Chem 2002. [DOI: 10.1016/s1010-6030(02)00008-4] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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