501
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Interaction of Di-2-pyridylketone 2-pyridine Carboxylic Acid Hydrazone and Its Copper Complex with BSA: Effect on Antitumor Activity as Revealed by Spectroscopic Studies. Molecules 2016; 21:molecules21050563. [PMID: 27136517 PMCID: PMC6274005 DOI: 10.3390/molecules21050563] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Revised: 04/14/2016] [Accepted: 04/22/2016] [Indexed: 01/14/2023] Open
Abstract
The drug, di-2-pyridylketone-2-pyridine carboxylic acid hydrazone (DPPCAH) and its copper complex (DPPCAH-Cu) exhibit significant antitumor activity. However, the mechanism of their pharmacological interaction with the biological molecule bovine serum albumin (BSA) remains poorly understood. The present study elucidates the interactions between the drug and BSA through MTT assays, spectroscopic methods and molecular docking analysis. Our results indicate that BSA could attenuate effect on the cytotoxicity of DPPCAH, but not DPPCAH-Cu. Data from fluorescence quenching measurements demonstrated that both DPPCAH and DPPCAH-Cu could bind to BSA, with a reversed effect on the environment of tryptophan residues in polarity. CD spectra revealed that the DPPCAH-Cu exerted a slightly stronger effect on the secondary structure of BSA than DPPCAH. The association constant of DPPCAH with BSA was greater than that of DPPCAH-Cu. Docking studies indicated that the binding of DPPCAH to BSA involved a greater number of hydrogen bonds compared to DPPCAH-Cu. The calculated distances between bound ligands and tryptophans in BSA were in agreement with fluorescence resonance energy transfer results. Thus, the binding affinity of the drug (DPPCAH or DPPCAH-Cu) with BSA partially contributes to its antitumor activity; the greater the drug affinity is to BSA, the less is its antitumor activity.
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502
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Brulé T, Bouhelier A, Dereux A, Finot E. Discrimination between Single Protein Conformations Using Dynamic SERS. ACS Sens 2016. [DOI: 10.1021/acssensors.6b00097] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Thibault Brulé
- Laboratoire Interdisciplinaire
Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université de Bourgogne Franche-Comté, F-21078 Dijon, France
| | - Alexandre Bouhelier
- Laboratoire Interdisciplinaire
Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université de Bourgogne Franche-Comté, F-21078 Dijon, France
| | - Alain Dereux
- Laboratoire Interdisciplinaire
Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université de Bourgogne Franche-Comté, F-21078 Dijon, France
| | - Eric Finot
- Laboratoire Interdisciplinaire
Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université de Bourgogne Franche-Comté, F-21078 Dijon, France
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503
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Epoxide hydrolase-catalyzed enantioselective conversion of trans -stilbene oxide: Insights into the reaction mechanism from steady-state and pre-steady-state enzyme kinetics. Arch Biochem Biophys 2016; 591:66-75. [DOI: 10.1016/j.abb.2015.12.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 12/16/2015] [Accepted: 12/17/2015] [Indexed: 11/18/2022]
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504
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Kenry K, Loh KP, Lim CT. Selective concentration-dependent manipulation of intrinsic fluorescence of plasma proteins by graphene oxide nanosheets. RSC Adv 2016. [DOI: 10.1039/c6ra04978h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We investigate the molecular interactions between graphene oxide (GO) and blood plasma proteins, in particular, the influence of GO on the intrinsic fluorescence of these proteins.
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Affiliation(s)
- Kenry Kenry
- NUS Graduate School for Integrative Sciences and Engineering
- National University of Singapore
- Singapore 117456
- Singapore
- Centre for Advanced 2D Materials and Graphene Research Centre
| | - Kian Ping Loh
- Centre for Advanced 2D Materials and Graphene Research Centre
- National University of Singapore
- Singapore 117543
- Singapore
- Department of Chemistry
| | - Chwee Teck Lim
- Centre for Advanced 2D Materials and Graphene Research Centre
- National University of Singapore
- Singapore 117543
- Singapore
- Department of Biomedical Engineering
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505
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de Lima SV, de Oliveira HP, de Melo CP. Electrical impedance monitoring of protein unfolding. RSC Adv 2016. [DOI: 10.1039/c6ra20901g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
We have applied electrical impedance spectroscopy (EIS) to investigate how the dielectric characteristics of protein aqueous solutions respond to varying amounts of a co-dissolved surfactant.
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Affiliation(s)
| | - Helinando P. de Oliveira
- Instituto de Pesquisa em Ciência dos Materiais
- Universidade Federal do Vale do São Francisco
- Juazeiro
- Brazil
| | - Celso P. de Melo
- Departamento de Física
- Universidade Federal de Pernambuco
- Recife
- Brazil
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506
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Pu J, Hu X, Liao J, Li YW, Qin JL, Xie YL, Zhan CG, Yang XL, Liao F. Achievement of linear response for competitive bioaffinity assays of ligands: criteria of optimized interaction systems. RSC Adv 2016. [DOI: 10.1039/c6ra06426d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
For a linear response, an optimized competitive bioaffinity assay of a ligand requiresCRT> 3 ×CPT,CPT> 50 ×KdR, andKdR> 260 ×KdX(CRTandCPTare concentrations of the probe and protein whileKdXandKdRareKdfor the ligand and probe, respectively).
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Affiliation(s)
- J. Pu
- Key Laboratory of Clinical Laboratory Diagnosis of the Education Ministry
- College of Laboratory Medicine
- Chongqing Medical University
- Chongqing 400016
- China
| | - X. L. Hu
- Key Laboratory of Clinical Laboratory Diagnosis of the Education Ministry
- College of Laboratory Medicine
- Chongqing Medical University
- Chongqing 400016
- China
| | - J. Liao
- Central Laboratory
- Yongchuan Hospital
- Chongqing Medical University
- Chongqing 402160
- China
| | - Y. W. Li
- Key Laboratory of Clinical Laboratory Diagnosis of the Education Ministry
- College of Laboratory Medicine
- Chongqing Medical University
- Chongqing 400016
- China
| | - J. L. Qin
- Key Laboratory of Clinical Laboratory Diagnosis of the Education Ministry
- College of Laboratory Medicine
- Chongqing Medical University
- Chongqing 400016
- China
| | - Y. L. Xie
- Key Laboratory of Clinical Laboratory Diagnosis of the Education Ministry
- College of Laboratory Medicine
- Chongqing Medical University
- Chongqing 400016
- China
| | - C.-G. Zhan
- Molecular Modeling and Biopharmaceutical Center
- Department of Pharmaceutical Sciences
- College of Pharmacy
- University of Kentucky
- Lexington
| | - X. L. Yang
- Key Laboratory of Clinical Laboratory Diagnosis of the Education Ministry
- College of Laboratory Medicine
- Chongqing Medical University
- Chongqing 400016
- China
| | - F. Liao
- Key Laboratory of Clinical Laboratory Diagnosis of the Education Ministry
- College of Laboratory Medicine
- Chongqing Medical University
- Chongqing 400016
- China
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507
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Stefanucci A, Mosquera J, Vázquez E, Mascareñas JL, Novellino E, Mollica A. Synthesis, Characterization, and DNA Binding Profile of a Macrocyclic β-Sheet Analogue of ARC Protein. ACS Med Chem Lett 2015; 6:1220-4. [PMID: 26713108 DOI: 10.1021/acsmedchemlett.5b00363] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Accepted: 10/29/2015] [Indexed: 12/29/2022] Open
Abstract
ARC repressor (apoptosis repressor with caspase recruitment domain) is a protein which binds selectively to a specific sequence of DNA. In humans, ARC is primarily expressed in striated muscle tissue, which normally does not undergo rapid cell turnover. This suggests that ARC may play a protective role in the prevention against Duchenne Muscular Dystrophy and several types of tumors. In this Letter we report the synthesis, characterization, and conformational analysis of a β-sheet ARC repressor mimetic, based on the amino acid sequence of the β-sheet domain in the ARC protein. The ability of this β-sheet macrocycle to bind to double-stranded DNA was also evaluated using spectroscopic methods. Our data show that the synthetic peptide has a defined conformation and is able to bind DNA with reasonable affinity. These initial results lay the groundwork for the design of novel β-sheets folded peptides as valuable substitutes of transcription factor proteins in drug therapy.
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Affiliation(s)
- Azzurra Stefanucci
- Dipartimento
di Chimica, Sapienza, Università di Roma, P.le A. Moro
5, 00187 Rome, Italy
| | - Jesús Mosquera
- Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CIQUS), Departamento de Química Orgánica, Universidade de Santiago de Compostela, 15782 Santiago
de Compostela, Spain
| | - Eugènio Vázquez
- Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CIQUS), Departamento de Química Orgánica, Universidade de Santiago de Compostela, 15782 Santiago
de Compostela, Spain
| | - José L. Mascareñas
- Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CIQUS), Departamento de Química Orgánica, Universidade de Santiago de Compostela, 15782 Santiago
de Compostela, Spain
| | - Ettore Novellino
- Dipartimento
di Farmacia, Università di Napoli “Federico II”, Via D. Montesano, 49, 80131 Naples, Italy
| | - Adriano Mollica
- Dipartimento
di Farmacia, Università di Chieti-Pescara “G. d’Annunzio”, Via dei Vestini 31, 66100 Chieti, Italy
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508
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Li W, Chen D, Wang H, Luo S, Dong L, Zhang Y, Shi J, Tong B, Dong Y. Quantitation of Albumin in Serum Using "Turn-on" Fluorescent Probe with Aggregation-Enhanced Emission Characteristics. ACS APPLIED MATERIALS & INTERFACES 2015; 7:26094-26100. [PMID: 26553289 DOI: 10.1021/acsami.5b07422] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
An aggregation-enhanced emission active luminogen named as sodium 4,4'4″-(3,4-diphenyl-1H-pyrrole-1,2,5-triyl)tribenzoate (DP-TPPNa) with propeller construction was synthesized and developed as a "turn on" fluorescent probe for in situ quantitation of albumin in blood serum. The DP-TPPNa fluorescence intensity was linearly correlated with the concentration of two serum albumins, bovine serum albumin (BSA) and human serum albumin (HSA), in pure PBS buffer in the ranges of 2.18-70 and 1.68-100 μg/mL, respectively. The detection limits were as low as 2.18 μg/mL for BSA and 1.68 μg/mL for HSA. The response time of fluorescence to serum albumin (SA) was very short (below 6 s), which achieved real-time detection. It also showed high selectivity to SA because other components in serum barely interfere with the detection of DP-TPPNa to SA, enabling in situ quantitative detection of SA without isolation from serum. DP-TPPNa was successfully applied for the quantitative detection of BSA in fetal bovine serum. The mechanism of fluorescent turn-on behavior was elucidated utilizing an unfolding process induced by guanidine hydrochloride, which revealed a capture process via selective hydrophobic interaction and hydrogen bonding between luminogen and SA.
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Affiliation(s)
- Wangyang Li
- School of Materials Science and Engineering, Beijing Institute of Technology , Beijing, 100081, China
| | - Didi Chen
- School of Materials Science and Engineering, Beijing Institute of Technology , Beijing, 100081, China
| | - Huan Wang
- School of Materials Science and Engineering, Beijing Institute of Technology , Beijing, 100081, China
| | - Shanshan Luo
- School of Materials Science and Engineering, Beijing Institute of Technology , Beijing, 100081, China
| | - Lichao Dong
- School of Materials Science and Engineering, Beijing Institute of Technology , Beijing, 100081, China
| | - Yahui Zhang
- School of Materials Science and Engineering, Beijing Institute of Technology , Beijing, 100081, China
| | - Jianbing Shi
- School of Materials Science and Engineering, Beijing Institute of Technology , Beijing, 100081, China
| | - Bin Tong
- School of Materials Science and Engineering, Beijing Institute of Technology , Beijing, 100081, China
| | - Yuping Dong
- School of Materials Science and Engineering, Beijing Institute of Technology , Beijing, 100081, China
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509
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Sanchuki HBS, Valdameri G, Moure VR, Rodriguez JA, Pedrosa FO, Souza EM, Korolik V, Ribeiro RR, Huergo LF. Conserved histidine residues at the ferroxidase centre of the Campylobacter jejuni Dps protein are not strictly required for metal binding and oxidation. MICROBIOLOGY-SGM 2015; 162:156-163. [PMID: 26555736 DOI: 10.1099/mic.0.000210] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Iron is an essential micronutrient for living organisms as it is involved in a broad variety of important biological processes. However, free iron inside the cell could be potentially toxic, generating hydroxyl radicals through the Fenton reaction. Dps (DNA-binding protein from starved cells) belongs to a subfamily of ferritins and can store iron atoms inside the dodecamer. The presence of a ferroxidase centre, composed of highly conserved residues, is a signature of this protein family. In this study, we analysed the role of two conserved histidine residues (H25 and H37) located at the ferroxidase centre of the Campylobacter jejuni Dps protein by replacing them with glycine residues. The C. jejuni H25G/H37G substituted variant showed reduced iron binding and ferroxidase activities in comparison with wt Dps, while DNA-binding activity remained unaffected. We also found that both CjDps wt and CjDps H25G/H37G were able to bind manganese atoms. These results indicate that the H25 and H37 residues at the ferroxidase centre of C. jejuni Dps are not strictly required for metal binding and oxidation.
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Affiliation(s)
- Heloisa B S Sanchuki
- Departamento de Bioquímica e Biologia Molecular, UFPR Curitiba, PR, Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Brazil
| | - Glaucio Valdameri
- Departamento de Bioquímica e Biologia Molecular, UFPR Curitiba, PR, Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Brazil
| | - Vivian R Moure
- Departamento de Bioquímica e Biologia Molecular, UFPR Curitiba, PR, Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Brazil
| | - Jorge A Rodriguez
- Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C. Guadalajara, Mexico
| | - Fábio O Pedrosa
- Departamento de Bioquímica e Biologia Molecular, UFPR Curitiba, PR, Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Brazil
| | - Emanuel M Souza
- Departamento de Bioquímica e Biologia Molecular, UFPR Curitiba, PR, Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Brazil
| | - Victoria Korolik
- Institute for Glycomics, Griffith University, Gold Coast, Queensland, Australia
| | | | - Luciano F Huergo
- Setor Litoral, UFPR, Matinhos, PR, Brazil.,Departamento de Bioquímica e Biologia Molecular, UFPR Curitiba, PR, Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Brazil
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510
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Spa SJ, Bunschoten A, Rood MTM, Peters RJB, Koster AJ, van Leeuwen FWB. Orthogonal Functionalization of Ferritin via Supramolecular Re‐Assembly. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500386] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Silvia J. Spa
- Interventional Molecular Imaging Laboratory, Department of Radiology, Leiden University Medical Center, 2300 RC Leiden, The Netherlands, http://www.interventionalmolecularimaging.com
| | - Anton Bunschoten
- Interventional Molecular Imaging Laboratory, Department of Radiology, Leiden University Medical Center, 2300 RC Leiden, The Netherlands, http://www.interventionalmolecularimaging.com
| | - Marcus T. M. Rood
- Interventional Molecular Imaging Laboratory, Department of Radiology, Leiden University Medical Center, 2300 RC Leiden, The Netherlands, http://www.interventionalmolecularimaging.com
| | - Ruud J. B. Peters
- RIKILT‐BU Contaminants and Toxins, Wageningen University, 6708 WB Wageningen, The Netherlands
| | - Abraham J. Koster
- Molecular Cell Biology, Leiden University Medical Center, 2300 RC Leiden, The Netherlands
| | - Fijs W. B. van Leeuwen
- Interventional Molecular Imaging Laboratory, Department of Radiology, Leiden University Medical Center, 2300 RC Leiden, The Netherlands, http://www.interventionalmolecularimaging.com
- Laboratory of Bio Nano Technology, Wageningen University, 6708 PB Wageningen, The Netherlands
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