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Bellia F, Lanza V, Naletova I, Tomasello B, Ciaffaglione V, Greco V, Sciuto S, Amico P, Inturri R, Vaccaro S, Campagna T, Attanasio F, Tabbì G, Rizzarelli E. Copper(II) Complexes with Carnosine Conjugates of Hyaluronic Acids at Different Dipeptide Loading Percentages Behave as Multiple SOD Mimics and Stimulate Nrf2 Translocation and Antioxidant Response in In Vitro Inflammatory Model. Antioxidants (Basel) 2023; 12:1632. [PMID: 37627627 PMCID: PMC10452038 DOI: 10.3390/antiox12081632] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 08/07/2023] [Accepted: 08/16/2023] [Indexed: 08/27/2023] Open
Abstract
A series of copper(II) complexes with the formula [Cu2+Hy(x)Car%] varying the molecular weight (MW) of Hyaluronic acid (Hy, x = 200 or 700 kDa) conjugated with carnosine (Car) present at different loading were synthesized and characterized via different spectroscopic techniques. The metal complexes behaved as Cu, Zn-superoxide dismutase (SOD1) mimics and showed some of the most efficient reaction rate values produced using a synthetic and water-soluble copper(II)-based SOD mimic reported to date. The increase in the percentage of Car moieties parallels the enhancement of the I50 value determined via the indirect method of Fridovich. The presence of the non-functionalized Hy OH groups favors the scavenger activity of the copper(II) complexes with HyCar, recalling similar behavior previously found for the copper(II) complexes with Car conjugated using β-cyclodextrin or trehalose. In keeping with the new abilities of SOD1 to activate protective agents against oxidative stress in rheumatoid arthritis and osteoarthritis diseases, Cu2+ interaction with HyCar promotes the nuclear translocation of erythroid 2-related factor that regulates the expressions of target genes, including Heme-Oxigenase-1, thus stimulating an antioxidant response in osteoblasts subjected to an inflammatory/oxidative insult.
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Affiliation(s)
- Francesco Bellia
- Institute of Crystallography, National Council of Research (CNR), P. Gaifami 18, 95126 Catania, Italy; (F.B.); (V.L.); (I.N.); (V.C.); (T.C.); (F.A.); (E.R.)
| | - Valeria Lanza
- Institute of Crystallography, National Council of Research (CNR), P. Gaifami 18, 95126 Catania, Italy; (F.B.); (V.L.); (I.N.); (V.C.); (T.C.); (F.A.); (E.R.)
| | - Irina Naletova
- Institute of Crystallography, National Council of Research (CNR), P. Gaifami 18, 95126 Catania, Italy; (F.B.); (V.L.); (I.N.); (V.C.); (T.C.); (F.A.); (E.R.)
| | - Barbara Tomasello
- Department of Drug and Health Sciences, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy;
| | - Valeria Ciaffaglione
- Institute of Crystallography, National Council of Research (CNR), P. Gaifami 18, 95126 Catania, Italy; (F.B.); (V.L.); (I.N.); (V.C.); (T.C.); (F.A.); (E.R.)
| | - Valentina Greco
- Department of Chemical Sciences, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy; (V.G.); (S.S.)
| | - Sebastiano Sciuto
- Department of Chemical Sciences, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy; (V.G.); (S.S.)
| | - Pietro Amico
- Fidia Farmaceutici SpA, Contrada Pizzuta, 96017 Noto, Italy; (P.A.); (R.I.); (S.V.)
| | - Rosanna Inturri
- Fidia Farmaceutici SpA, Contrada Pizzuta, 96017 Noto, Italy; (P.A.); (R.I.); (S.V.)
| | - Susanna Vaccaro
- Fidia Farmaceutici SpA, Contrada Pizzuta, 96017 Noto, Italy; (P.A.); (R.I.); (S.V.)
| | - Tiziana Campagna
- Institute of Crystallography, National Council of Research (CNR), P. Gaifami 18, 95126 Catania, Italy; (F.B.); (V.L.); (I.N.); (V.C.); (T.C.); (F.A.); (E.R.)
| | - Francesco Attanasio
- Institute of Crystallography, National Council of Research (CNR), P. Gaifami 18, 95126 Catania, Italy; (F.B.); (V.L.); (I.N.); (V.C.); (T.C.); (F.A.); (E.R.)
| | - Giovanni Tabbì
- Institute of Crystallography, National Council of Research (CNR), P. Gaifami 18, 95126 Catania, Italy; (F.B.); (V.L.); (I.N.); (V.C.); (T.C.); (F.A.); (E.R.)
| | - Enrico Rizzarelli
- Institute of Crystallography, National Council of Research (CNR), P. Gaifami 18, 95126 Catania, Italy; (F.B.); (V.L.); (I.N.); (V.C.); (T.C.); (F.A.); (E.R.)
- Department of Chemical Sciences, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy; (V.G.); (S.S.)
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Joachim I, Rikker S, Hauck D, Ponader D, Boden S, Sommer R, Hartmann L, Titz A. Development and optimization of a competitive binding assay for the galactophilic low affinity lectin LecA from Pseudomonas aeruginosa. Org Biomol Chem 2018; 14:7933-48. [PMID: 27488655 DOI: 10.1039/c6ob01313a] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Infections with the Gram-negative bacterium Pseudomonas aeruginosa result in a high mortality among immunocompromised patients and those with cystic fibrosis. The pathogen can switch from planktonic life to biofilms, and thereby shields itself against antibiotic treatment and host immune defense to establish chronic infections. The bacterial protein LecA, a C-type lectin, is a virulence factor and an integral component for biofilm formation. Inhibition of LecA with its carbohydrate ligands results in reduced biofilm mass, a potential Achilles heel for treatment. Here, we report the development and optimization of a fluorescence polarization-based competitive binding assay with LecA for application in screening of potential inhibitors. As a consequence of the low affinity of d-galactose for LecA, the fluorescent ligand was optimized to reduce protein consumption in the assay. The assay was validated using a set of known inhibitors of LecA and IC50 values in good agreement with the known Kd values were obtained. Finally, we employed the optimized assay to screen sets of synthetic thio-galactosides and natural blood group antigens and report their structure-activity relationship. In addition, we evaluated a multivalent fluorescent assay probe for LecA and report its applicability in an inhibition assay.
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Affiliation(s)
- Ines Joachim
- Chemical Biology of Carbohydrates, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), D-66123 Saarbrücken, Germany. and Deutsches Zentrum für Infektionsforschung (DZIF), Standort Hannover, Braunschweig, Germany and Department of Chemistry and Graduate School Chemical Biology, University of Konstanz, D-78457 Konstanz, Germany
| | - Sebastian Rikker
- Department of Chemistry and Graduate School Chemical Biology, University of Konstanz, D-78457 Konstanz, Germany
| | - Dirk Hauck
- Chemical Biology of Carbohydrates, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), D-66123 Saarbrücken, Germany. and Deutsches Zentrum für Infektionsforschung (DZIF), Standort Hannover, Braunschweig, Germany
| | - Daniela Ponader
- Max Planck Institute of Colloids and Interfaces, Department of Biomolecular Systems, Research Campus Golm, 14424 Potsdam, Germany
| | - Sophia Boden
- Heinrich-Heine-University Duesseldorf, Institute of Organic Chemistry and Macromolecular Chemistry, D-40225 Düsseldorf, Germany
| | - Roman Sommer
- Chemical Biology of Carbohydrates, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), D-66123 Saarbrücken, Germany. and Deutsches Zentrum für Infektionsforschung (DZIF), Standort Hannover, Braunschweig, Germany
| | - Laura Hartmann
- Heinrich-Heine-University Duesseldorf, Institute of Organic Chemistry and Macromolecular Chemistry, D-40225 Düsseldorf, Germany
| | - Alexander Titz
- Chemical Biology of Carbohydrates, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), D-66123 Saarbrücken, Germany. and Deutsches Zentrum für Infektionsforschung (DZIF), Standort Hannover, Braunschweig, Germany and Department of Chemistry and Graduate School Chemical Biology, University of Konstanz, D-78457 Konstanz, Germany
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Lanza V, D'Agata R, Iacono G, Bellia F, Spoto G, Vecchio G. Cyclam glycoconjugates as lectin ligands and protective agents of metal-induced amyloid aggregation. J Inorg Biochem 2015; 153:377-382. [DOI: 10.1016/j.jinorgbio.2015.06.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Revised: 06/15/2015] [Accepted: 06/15/2015] [Indexed: 01/17/2023]
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5
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New 8-hydroxyquinoline galactosides. The role of the sugar in the antiproliferative activity of copper(II) ionophores. J Inorg Biochem 2015; 142:101-8. [DOI: 10.1016/j.jinorgbio.2014.09.017] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 09/26/2014] [Accepted: 09/29/2014] [Indexed: 11/18/2022]
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6
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Kopitzki S, Dilmaghani KA, Thiem J. Synthesis of benzaldehyde-functionalized LewisX trisaccharide analogs for glyco-SAM formation. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.10.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Abstract
Surface plasmon resonance imaging (SPRI) is a powerful tool for simple, fast and cheap nucleic acid detection. Great efforts have been made during the last decade with the aim of developing even more sensitive and specific SPRI-based methods to be used for the direct detection of DNA and RNA. Here, after a description of the fundamentals of SPRI, the state of the art of recent platform and assay developments is presented, with special attention given to advances in SPRI signal enhancement procedures.
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Affiliation(s)
- Roberta D'Agata
- Dipartimento di Scienze Chimiche, Università di Catania, Catania, Italy
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8
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Grasso G, Spoto G. Plasmonics for the study of metal ion–protein interactions. Anal Bioanal Chem 2012; 405:1833-43. [DOI: 10.1007/s00216-012-6421-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2012] [Revised: 09/10/2012] [Accepted: 09/12/2012] [Indexed: 12/19/2022]
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9
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Abstract
The combined use of surface plasmon resonance (SPR) and modified or mimic oligonucleotides have expanded diagnostic capabilities of SPR-based biosensors and have allowed detailed studies of molecular recognition processes. This review summarizes the most significant advances made in this area over the past 15 years. Functional and conformationally restricted DNA analogs (e.g., aptamers and PNAs) when used as components of SPR biosensors contribute to enhance the biosensor sensitivity and selectivity. At the same time, the SPR technology brings advantages that allows forbetter exploration of underlying properties of non-natural nucleic acid structures such us DNAzymes, LNA and HNA.
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Affiliation(s)
- Roberta D'Agata
- Dipartimento di Scienze Chimiche, Università di Catania, Catania, Italy
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Oliveri V, Giuffrida ML, Vecchio G, Aiello C, Viale M. Gluconjugates of 8-hydroxyquinolines as potential anti-cancer prodrugs. Dalton Trans 2012; 41:4530-5. [PMID: 22354329 DOI: 10.1039/c2dt12371a] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
8-Hydroxyquinolines are systems of great interest in the field of inorganic and bioinorganic chemistry. They are metal-binding compounds and are known to exhibit a variety of biological activities, such as antibacterial and anticancer activities. Among these systems, clioquinol has been the focus of a renewed interest in recent years. In this scenario, we synthesized and characterized the new clioquinol glucoconjugate, 5-chloro-7-iodo-8-quinolinyl-β-D-glucopyranoside in order to compare this system to that of clioquinol. We also synthesized, 8-quinolinyl-β-D-glucopyranoside, an 8-hydroxyquinoline glucoconjugate. The reason for the development of glucoconjugates is the glucose avidity, and the over-expression of glucose transporters in cancer cells. Here we demonstrate that glycoconjugates are cleaved in vitro by β-glucosidase and these systems exhibit antiproliferative activity against different tumor cell lines in the presence of copper(II) ions.
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Affiliation(s)
- Valentina Oliveri
- Dipartimento di Scienze Chimiche, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
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11
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D’Agata R, Spoto G. Surface Plasmon Resonance-Based Methods. DETECTION OF NON-AMPLIFIED GENOMIC DNA 2012. [DOI: 10.1007/978-94-007-1226-3_9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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12
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Carnosine derivatives: new multifunctional drug-like molecules. Amino Acids 2011; 43:153-63. [DOI: 10.1007/s00726-011-1178-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2011] [Accepted: 11/22/2011] [Indexed: 10/15/2022]
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13
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D'Agata R, Breveglieri G, Zanoli LM, Borgatti M, Spoto G, Gambari R. Direct detection of point mutations in nonamplified human genomic DNA. Anal Chem 2011; 83:8711-7. [PMID: 21978174 DOI: 10.1021/ac2021932] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ultrasensitive detection protocols not requiring polymerase chain reaction (PCR)-mediated target DNA amplification are expected to significantly improve our possibilities in several research and diagnostic applications for which minute cell quantities are available. For this reason we have tested a nanoparticle-enhanced surface plasmon resonance imaging (SPRI) sensing strategy to detect point mutations in nonamplified genomic DNA. We have used genomic DNAs, not subject to costly, time-consuming, and prone to contamination PCR-based amplification procedures, obtained from both healthy individuals and homozygous or heterozygous patients affected by β-thalassemia, in order to demonstrate the specificity and the sensitivity of the described sensing strategy. The assay we describe is ultrasensitive and convenient. Attomolar concentrations of target genomic DNA are detected, DNAs from healthy individuals and homozygous or heterozygous patients affected by β-thalassemia are discriminated, and only simple manipulations of the genetic samples are required before the analysis. The proposed ultrasensitive detection of DNA point mutations involved in genomic disorders possibly represents an important advantage in several biomedical applications.
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Affiliation(s)
- Roberta D'Agata
- Dipartimento di Scienze Chimiche, Università di Catania, Catania, Italy
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Zanoli LM, D’Agata R, Spoto G. Functionalized gold nanoparticles for ultrasensitive DNA detection. Anal Bioanal Chem 2011; 402:1759-71. [DOI: 10.1007/s00216-011-5318-3] [Citation(s) in RCA: 96] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2011] [Revised: 07/13/2011] [Accepted: 08/04/2011] [Indexed: 12/18/2022]
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15
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Deng L, Norberg O, Uppalapati S, Yan M, Ramström O. Stereoselective synthesis of light-activatable perfluorophenylazide-conjugated carbohydrates for glycoarray fabrication and evaluation of structural effects on protein binding by SPR imaging. Org Biomol Chem 2011; 9:3188-98. [PMID: 21423935 PMCID: PMC4030401 DOI: 10.1039/c1ob05040k] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of light-activatable perfluorophenylazide (PFPA)-conjugated carbohydrate structures have been synthesized and applied to glycoarray fabrication. The glycoconjugates were structurally varied with respect to anomeric attachment, S-, and O-linked carbohydrates, respectively, as well as linker structure and length. Efficient stereoselective synthetic routes were developed, leading to the formation of the PFPA-conjugated structures in good yields over few steps. The use of glycosyl thiols as donors proved especially efficient and provided the final compounds in up to 70% total yield with high anomeric purities. PFPA-based photochemistry was subsequently used to generate carbohydrate arrays on a polymeric surface, and surface plasmon resonance imaging (SPRi) was applied for evaluation of carbohydrate-protein interactions using the plant lectin Concanavalin A (Con A) as a probe. The results indicate better performance and equal efficiency of S- and O-linked structures with intermediate linker length.
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Affiliation(s)
- Lingquan Deng
- Department of Chemistry, KTH - Royal Institute of Technology, Teknikringen 30, S-10044, Stockholm, Sweden
| | - Oscar Norberg
- Department of Chemistry, KTH - Royal Institute of Technology, Teknikringen 30, S-10044, Stockholm, Sweden
| | - Suji Uppalapati
- Department of Chemistry, Portland State University, P.O. Box 751, Portland, Oregon, 97207-0751, USA
| | - Mingdi Yan
- Department of Chemistry, KTH - Royal Institute of Technology, Teknikringen 30, S-10044, Stockholm, Sweden
- Department of Chemistry, Portland State University, P.O. Box 751, Portland, Oregon, 97207-0751, USA
| | - Olof Ramström
- Department of Chemistry, KTH - Royal Institute of Technology, Teknikringen 30, S-10044, Stockholm, Sweden
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The interaction of La3+ complexes of DOTA/DTPA glycoconjugates with the RCA120 lectin: a saturation transfer difference NMR spectroscopic study. J Biol Inorg Chem 2011; 16:725-34. [DOI: 10.1007/s00775-011-0773-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2010] [Accepted: 03/19/2011] [Indexed: 10/18/2022]
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17
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New glycoside derivatives of carnosine and analogs resistant to carnosinase hydrolysis: Synthesis and characterization of their copper(II) complexes. J Inorg Biochem 2011; 105:181-8. [DOI: 10.1016/j.jinorgbio.2010.10.014] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2010] [Revised: 10/26/2010] [Accepted: 10/27/2010] [Indexed: 01/22/2023]
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18
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Tyagi A, Wang X, Deng L, Ramström O, Yan M. Photogenerated carbohydrate microarrays to study carbohydrate-protein interactions using surface plasmon resonance imaging. Biosens Bioelectron 2010; 26:344-50. [PMID: 20800471 DOI: 10.1016/j.bios.2010.08.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2010] [Revised: 07/27/2010] [Accepted: 08/02/2010] [Indexed: 11/17/2022]
Abstract
A photochemical strategy to generate carbohydrate microarrays on flat sensor surfaces, and to study the protein-binding effects of these arrays by surface plasmon resonance imaging is described. The approach was validated using a panel of carbohydrate-binding proteins. The coupling agents, thiol-functionalized perfluorophenyl azides, allow the covalent attachment of underivatized carbohydrates to gold surfaces by a fast photochemical reaction. Carbohydrate microarrays composed of 3,6-di-O-(α-D-mannopyranosyl)-D-mannopyranose (Man3), 2-O-α-D-mannopyranosyl-D-mannopyranose (Man2), D-mannose (Man), D-glucose (Glc), and D-galactose (Gal) were constructed, and the binding studies were carried out in real-time using surface plasmon resonance imaging. Results showed that the immobilized carbohydrate ligands retained their binding affinities with lectins, the rank order of which was consistent with that of the free ligands in solution. The detection limit of Man3, Man2, Man, and Glc with the lectin Concanavalin A was measured to be 0.29 nM, 0.18 nM, 0.61 nM, and 3.1 nM, respectively. In addition, soybean agglutinin and Griffonia simplicifolia lectin II were tested on the array, and the results were consistent with the binding selectivity of these lectins with the carbohydrate ligands.
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Affiliation(s)
- Anuradha Tyagi
- Department of Chemistry, Portland State University, P.O. Box 751, Portland, OR 97207-075, United States
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D'Agata R, Corradini R, Ferretti C, Zanoli L, Gatti M, Marchelli R, Spoto G. Ultrasensitive detection of non-amplified genomic DNA by nanoparticle-enhanced surface plasmon resonance imaging. Biosens Bioelectron 2010; 25:2095-100. [PMID: 20227870 DOI: 10.1016/j.bios.2010.02.008] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2009] [Revised: 02/05/2010] [Accepted: 02/12/2010] [Indexed: 11/27/2022]
Abstract
Technologies today available for the DNA detection rely on a combination of labeled probes hybridized to target sequences which are amplified by polymerase chain reaction (PCR). Direct detection methods that eliminate the requirement for both PCR and labeling steps could afford faster, cheaper and simpler devices for the analysis of small amounts of unamplified DNA. In this work we describe the results obtained in the ultrasensitive detection of non-amplified genomic DNA. We analyzed certified reference materials containing different amounts of genetically modified DNA by using a detection method which combines the nanoparticle-enhanced surface plasmon resonance imaging (SPRI) biosensing to the peptide nucleic acids (PNAs) improved selectivity and sensitivity in targeting complementary DNA sequences. The method allowed us to obtain a 41 zM sensitivity in targeting genomic DNA even in the presence of a large excess of non-complementary DNA.
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Affiliation(s)
- Roberta D'Agata
- Dipartimento di Scienze Chimiche, Università di Catania, Viale Andrea Doria 6, I-95125 Catania, Italy
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Grasso G, D'Agata R, Zanoli L, Spoto G. Microfluidic networks for surface plasmon resonance imaging real-time kinetics experiments. Microchem J 2009. [DOI: 10.1016/j.microc.2009.05.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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21
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Lanza V, Vecchio G. New conjugates of superoxide dismutase/catalase mimetics with cyclodestrins. J Inorg Biochem 2009; 103:381-8. [DOI: 10.1016/j.jinorgbio.2008.11.017] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2008] [Revised: 11/21/2008] [Accepted: 11/24/2008] [Indexed: 10/21/2022]
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22
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D'Agata R, Corradini R, Grasso G, Marchelli R, Spoto G. Ultrasensitive detection of DNA by PNA and nanoparticle-enhanced surface plasmon resonance imaging. Chembiochem 2009; 9:2067-70. [PMID: 18680134 DOI: 10.1002/cbic.200800310] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Roberta D'Agata
- Dipartimento di Scienze Chimiche, Università di Catania, Viale Andrea Doria 6, 95125 Catania, Italy
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23
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Ciaccio C, Tundo GR, Grasso G, Spoto G, Marasco D, Ruvo M, Gioia M, Rizzarelli E, Coletta M. Somatostatin: a novel substrate and a modulator of insulin-degrading enzyme activity. J Mol Biol 2008; 385:1556-67. [PMID: 19073193 DOI: 10.1016/j.jmb.2008.11.025] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2008] [Revised: 10/15/2008] [Accepted: 11/17/2008] [Indexed: 12/26/2022]
Abstract
Insulin-degrading enzyme (IDE) is an interesting pharmacological target for Alzheimer's disease (AD), since it hydrolyzes beta-amyloid, producing non-neurotoxic fragments. It has also been shown that the somatostatin level reduction is a pathological feature of AD and that it regulates the neprilysin activity toward beta-amyloid. In this work, we report for the first time that IDE is able to hydrolyze somatostatin [k(cat) (s(-1))=0.38 (+/-0.05); K(m) (M)=7.5 (+/-0.9) x 10(-6)] at the Phe6-Phe7 amino acid bond. On the other hand, somatostatin modulates IDE activity, enhancing the enzymatic cleavage of a novel fluorogenic beta-amyloid through a decrease of the K(m) toward this substrate, which corresponds to the 10-25 amino acid sequence of the Abeta(1-40). Circular dichroism spectroscopy and surface plasmon resonance imaging experiments show that somatostatin binding to IDE brings about a concentration-dependent structural change of the secondary and tertiary structure(s) of the enzyme, revealing two possible binding sites. The higher affinity binding site disappears upon inactivation of IDE by ethylenediaminetetraacetic acid, which chelates the catalytic Zn(2+) ion. As a whole, these features suggest that the modulatory effect is due to an allosteric mechanism: somatostatin binding to the active site of one IDE subunit (where somatostatin is cleaved) induces an enhancement of IDE proteolytic activity toward fluorogenic beta-amyloid by another subunit. Therefore, this investigation on IDE-somatostatin interaction contributes to a more exhaustive knowledge about the functional and structural aspects of IDE and its pathophysiological implications in the amyloid deposition and somatostatin homeostasis in the brain.
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Affiliation(s)
- Chiara Ciaccio
- Department of Experimental Medicine and Biochemical Sciences, University of Roma Tor Vergata, Rome, Italy
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24
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Cisnetti F, Lefèvre AS, Guillot R, Lambert F, Blain G, Anxolabéhère-Mallart E, Policar C. A New Pentadentate Ligand Forms Both a Di- and a Mononuclear MnII Complex: Electrochemical, Spectroscopic and Superoxide Dismutase Activity Studies. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200601236] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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25
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Rich RL, Myszka DG. Survey of the year 2006 commercial optical biosensor literature. J Mol Recognit 2007; 20:300-66. [DOI: 10.1002/jmr.862] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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