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Haginaka J. Progress in Chiral Stationary Phases Based on Proteins and Glycoproteins. Chem Pharm Bull (Tokyo) 2022; 70:458-468. [PMID: 35786565 DOI: 10.1248/cpb.c22-00269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A lot of chiral stationary phases (CSPs) have been introduced for the purpose of analytical and preparative separations of enantiomers. CSPs based on proteins and glycoproteins have unique properties among those CSPs. This review article deals with the preparation of CSPs based on proteins and glycoproteins, their chiral recognition properties and mechanisms, focusing on the CSPs investigated in our group. The dealt proteins and glycoproteins are including bovine serum albumin, human serum albumin, lysozyme, pepsin, human α1-acid glycoprotein (AGP), chicken ovomucoid and chicken ovoglycoprotein (named chicken AGP).
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Affiliation(s)
- Jun Haginaka
- Institute for Biosciences, Mukogawa Women's University
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2
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Ruiz M. Into the Labyrinth of the Lipocalin α1-Acid Glycoprotein. Front Physiol 2021; 12:686251. [PMID: 34168570 PMCID: PMC8217824 DOI: 10.3389/fphys.2021.686251] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 05/17/2021] [Indexed: 12/28/2022] Open
Abstract
α1-acid glycoprotein (AGP), also known as Orosomucoid (ORM), belongs to the Lipocalin protein family and it is well-known for being a positive acute-phase protein. AGP is mostly found in plasma, with the liver as main contributor, but it is also expressed in other tissues such as the brain or the adipose tissue. Despite the vast literature on AGP, the physiological functions of the protein remain to be elucidated. A large number of activities mostly related to protection and immune system modulation have been described. Recently created AGP-knockout models have suggested novel physiological roles of AGP, including regulation of metabolism. AGP has an outstanding ability to efficiently bind endogenous and exogenous small molecules that together with the complex and variable glycosylation patterns, determine AGP functions. This review summarizes and discusses the recent findings on AGP structure (including glycans), ligand-binding ability, regulation, and physiological functions of AGP. Moreover, this review explores possible molecular and functional connections between AGP and other members of the Lipocalin protein family.
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Affiliation(s)
- Mario Ruiz
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
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3
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Revisiting Chiral Recognition Mechanism on Chicken Alpha 1-Acid Glycoprotein: Location of Chiral Binding Sites and Insight into Chiral Binding Mechanism. SEPARATIONS 2021. [DOI: 10.3390/separations8060073] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Chiral stationary phases based on chicken alpha 1-acid glycoprotein (cAGP) have been used for enantioseparations of various compounds. However, the chiral binding sites and mechanism have not been clarified yet. Based on chromatographic properties of native and W26-modified cAGP columns and docking simulations of studied compounds into the generated model structure of cAGP, the chiral binding sites were located on cAGP and the chiral binding mechanism was discussed. On cAGP, there existed a binding cavity lined with H25, W26, Y47, R128, T129, D161 and E168, which contribute electrostatic or hydrogen bonding interactions. Benzoin and chlorpheniramine enantiomers interacted with cAGP at almost the same sites a little away from W26, while propranolol enantiomers docked, slightly shifting toward H25 and W26. Furthermore, in addition to hydrophobic interactions, ionic interactions between amino groups of chlorpheniramine enantiomers and a carboxy group of D161 or E168 played an important role in the chiral recognition, while hydrophobic interactions and hydrogen bonding interactions worked for the chiral recognition of benzoin and propranolol enantiomers.
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4
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Mohammadnia F, Fatemi MH, Taghizadeh SM. The experimental and theoretical assessment of biopartitioning micellar liquid chromatography to mimic the drug‐protein binding of some pain‐relief drugs. J CHIN CHEM SOC-TAIP 2021. [DOI: 10.1002/jccs.202000210] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Fatemeh Mohammadnia
- Laboratory of Chemometrics, Faculty of Chemistry University of Mazandaran Babolsar Iran
- Novel Drug Delivery Systems, Faculty of Science Iran Polymer and Petrochemical Institute Tehran Iran
| | | | - Seyed Mojtaba Taghizadeh
- Novel Drug Delivery Systems, Faculty of Science Iran Polymer and Petrochemical Institute Tehran Iran
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5
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Zsila F, Samsonov SA, Maszota-Zieleniak M. Mind Your Dye: The Amyloid Sensor Thioflavin T Interacts with Sulfated Glycosaminoglycans Used To Induce Cross-β-Sheet Motifs. J Phys Chem B 2020; 124:11625-11633. [DOI: 10.1021/acs.jpcb.0c08273] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Ferenc Zsila
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, H-1117 Budapest, Hungary
| | - Sergey A. Samsonov
- Faculty of Chemistry, University of Gdańsk, ul. Wita Stwosza 63, 80-308 Gdańsk, Poland
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6
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Rubio-Clemente A, Chica E, Peñuela GA. Photolysis of a mixture of anthracene and benzo[a]pyrene at ultra-trace levels in natural water with disinfection purposes. J Environ Sci (China) 2020; 92:79-94. [PMID: 32430135 DOI: 10.1016/j.jes.2020.02.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 01/31/2020] [Accepted: 02/01/2020] [Indexed: 06/11/2023]
Abstract
The photodegradation of anthracene (AN) and benzo[a]pyrene (BaP), two priority polycyclic aromatic hydrocarbons (PAHs), was examined at ultra-trace levels in surface water to elucidate their behaviour under several irradiance values and types of radiation. The emitting flux and the spectrum of the lamps were found to develop a crucial role in AN and BaP degradation since removal efficiencies of the target contaminants higher than 99% were found after 15 min of irradiation under an ultraviolet C (UVC) irradiance of 0.63 mW/cm2, corresponding to a fluence of 560.25 mJ/cm2. On the other hand, although ultraviolet A (UVA) lamps exhibited a higher irradiance compared to that of UVC lamps, they were not efficient for degrading the target PAHs. The removal kinetic studies corroborated these findings, being the AN elimination rate in surface water higher than that in deionized water at optimal operating conditions. Disinfection potential was also measured. A rapid microbial load inactivation, in terms of total coliforms naturally contained in the water matrix studied, was evidenced within 15 min of treatment for the fluence referred. However, after 24 hr in the dark, a regrowth was observed. Additionally, photolysis products more toxic than the parent compounds were found, which were not removed even by extending the treatment time. In this regard, it can be concluded that the individual action of UVC light for removing AN and BaP with disinfection purposes is not an efficient treatment; therefore, the use of radiation in combination with other kinds of treatments is required.
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Affiliation(s)
- Ainhoa Rubio-Clemente
- Facultad de Ciencias de La Salud. Universidad Católica de Murcia (UCAM), Murcia 30107, Spain; Grupo GDCON, Facultad de Ingeniería, Sede de Investigaciones Universitarias (SIU), Universidad de Antioquia (UdeA), Medellín 050010, Colombia; Facultad de Ingeniería, Tecnológico de Antioquia-Institución Universitaria (TdeA), Medellín 050034, Colombia.
| | - Edwin Chica
- Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Antioquia (UdeA), Medellín 050010, Colombia
| | - Gustavo A Peñuela
- Grupo GDCON, Facultad de Ingeniería, Sede de Investigaciones Universitarias (SIU), Universidad de Antioquia (UdeA), Medellín 050010, Colombia
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7
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Interaction of antitubercular drug candidates with α 1-acid glycoprotein produced in pulmonary granulomas. Int J Biol Macromol 2019; 147:1318-1327. [PMID: 31759028 DOI: 10.1016/j.ijbiomac.2019.10.096] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 10/09/2019] [Accepted: 10/09/2019] [Indexed: 11/24/2022]
Abstract
The intracellular pathogen Mycobacterium tuberculosis can survive and replicate within host macrophages. Among various immunomodulatory substances, macrophages also produce α1-acid glycoprotein (AAG) which is secreted into the extracellular matrix of tuberculosis granulomas that represents a specific binding environment. Employing circular dichroism (CD) and UV/VIS absorption spectroscopic methods, we demonstrated and evaluated the AAG binding properties of novel antitubercular drug candidates developed against sensitive and multidrug-resistant strains of M. tuberculosis. As inferred from the CD spectroscopic data, these chemically diverse organic molecules are engulfed within the β-barrel of the protein either in a monomeric or dimeric form. Molecular docking simulations suggested the importance of H-bonds and ligand-aromatic residue π-π stacking interactions in stabilizing the drug molecules at the protein binding site. Based on the estimated Kd values (7-20 μM), AAG could be considered as the significant binding partner of the antitubercular agents studied herein. As such, it may affect the drug distribution and bioavailability not only in serum but also in macrophages and in the extracellular matrix of tuberculosis granulomas.
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8
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Evidences for Piperine inhibiting cancer by targeting human G-quadruplex DNA sequences. Sci Rep 2016; 6:39239. [PMID: 27995955 PMCID: PMC5171706 DOI: 10.1038/srep39239] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Accepted: 11/21/2016] [Indexed: 12/22/2022] Open
Abstract
Piperine, a naturally occurring alkaloid, is well known as anti-oxidant, anti-mutagenic, anti-tumor and anti-proliferative agent. Piperine exerts such pharmacological activities by binding or interacting with various cellular targets. Recently, the first report for Piperine interaction with duplex DNA has been published last year but its interaction with G-quadruplex structures has not been studied yet. Herein, we report for the first time the interaction of Piperine with various DNA G-quadruplex structures. Comprehensive biophysical techniques were employed to determine the basis of interaction for the complex formed between Piperine and G-quadruplex DNA sequences. Piperine showed specificity for G-quadruplex DNA over double stranded DNA, with highest affinity for G-quadruplex structure formed at c-myc promoter region. Further, in-vitro studies show that Piperine causes apoptosis-mediated cell death that further emphasizes the potential of this natural product, Piperine, as a promising candidate for targeting G-quadruplex structure and thus, acts as a potent anti-cancer agent.
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Haris P, Mary V, Haridas M, Sudarsanakumar C. Energetics, Thermodynamics, and Molecular Recognition of Piperine with DNA. J Chem Inf Model 2015; 55:2644-56. [DOI: 10.1021/acs.jcim.5b00514] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | | | - M. Haridas
- Inter
University Centre for Bioscience, Kannur University, Thalassery
Campus, Palayad, Kerala 670661, India
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Murayama K, Sonoyama M, Matsuda S. Strong Interaction of Bovine Brain Calmodulin with Bisphenol A: Effects on Secondary Structure, Conformation, Ca 2+-Binding Affinity, Gibbs Energy, and Domain Cooperativity. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2015. [DOI: 10.1246/bcsj.20150045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Koichi Murayama
- Department of Physiology and Biophysics, Graduate School of Medicine, Gifu University
| | - Masashi Sonoyama
- Department of Chemistry and Chemical Biology, Graduate School of Science and Technology, Gunma University
| | - Sadayuki Matsuda
- School of Natural Science, Engineering and Agriculture, Hokkaido University of Education
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11
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Ionescu S, Matei I, Tablet C, Hillebrand M. Theoretical ECD calculations – a useful tool for estimating the conformational change of a ligand in the binding pocket of proteins. Phys Chem Chem Phys 2013; 15:11604-14. [DOI: 10.1039/c3cp50466b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Singh PK, Sujana J, Mora AK, Nath S. Probing the DNA–ionic liquid interaction using an ultrafast molecular rotor. J Photochem Photobiol A Chem 2012. [DOI: 10.1016/j.jphotochem.2012.07.006] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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13
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Zheng Y, Wang X, Ji Y. Monoliths with proteins as chiral selectors for enantiomer separation. Talanta 2012; 91:7-17. [DOI: 10.1016/j.talanta.2012.01.039] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2011] [Revised: 01/15/2012] [Accepted: 01/18/2012] [Indexed: 12/25/2022]
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14
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Mayati A, Levoin N, Paris H, N'Diaye M, Courtois A, Uriac P, Lagadic-Gossmann D, Fardel O, Le Ferrec E. Induction of intracellular calcium concentration by environmental benzo(a)pyrene involves a β2-adrenergic receptor/adenylyl cyclase/Epac-1/inositol 1,4,5-trisphosphate pathway in endothelial cells. J Biol Chem 2011; 287:4041-52. [PMID: 22167199 DOI: 10.1074/jbc.m111.319970] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Polycyclic aromatic hydrocarbons (PAHs) such as benzo(a)pyrene (B(a)P) are widely distributed environmental contaminants, known as potent ligands of the aryl hydrocarbon receptor (AhR). These chemicals trigger an early and transient increase of intracellular calcium concentration ([Ca(2+)](i)), required for AhR-related effects of PAHs. The mechanisms involved in this calcium mobilization were investigated in the present study. We demonstrated that B(a)P-mediated [Ca(2+)](i) induction was prevented in endothelial HMEC-1 cells by counteracting β2-adrenoreceptor (β2ADR) activity using pharmacological antagonists, anti-β2ADR antibodies, or siRNA-mediated knockdown of β2ADR expression; by contrast, it was strongly potentiated by β2ADR overexpression in human kidney HEK293 cells. B(a)P was shown, moreover, to directly bind to β2ADR, as assessed by in vitro binding assays and molecular modeling. Pharmacological inhibition and/or siRNA-mediated silencing of various signaling actors acting downstream of β2ADR in a sequential manner, such as G protein, adenylyl cyclase, Epac-1 protein, and inositol 1,4,5-trisphosphate (IP(3))/IP(3) receptor, were next demonstrated to prevent B(a)P-induced calcium signal. Inhibition or knockdown of these signaling elements, as well as the use of chemical β-blockers, were finally shown to counteract B(a)P-mediated induction of cytochrome P-450 1B1, a prototypical AhR target gene. Taken together, our results show that B(a)P binds directly to β2ADR and consequently utilizes β2ADR machinery to mobilize [Ca(2+)](i), through activation of a G protein/adenylyl cyclase/cAMP/Epac-1/IP(3) pathway. This β2ADR-dependent signaling pathway activated by PAHs may likely be crucial for PAH-mediated up-regulation of AhR target genes, thus suggesting a contribution of β2ADR to the health-threatening effects of these environmental pollutants.
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Affiliation(s)
- Abdullah Mayati
- INSERM U1085/IRSET, IFR140, Université de Rennes 1, 2 Avenue du Pr. L. Bernard, Rennes 35043, France
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15
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Zsila F. Aromatic side-chain cluster of biotin binding site of avidin allows circular dichroism spectroscopic investigation of its ligand binding properties. J Mol Recognit 2011; 24:995-1006. [DOI: 10.1002/jmr.1147] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ferenc Zsila
- Department of Molecular Pharmacology; Institute of Biomolecular Chemistry, Chemical Research Center; H-1025; Budapest; Pusztaszeri út 59-67; Hungary
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16
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Rosenquist TA. Genetic loci that affect aristolochic acid-induced nephrotoxicity in the mouse. Am J Physiol Renal Physiol 2011; 300:F1360-7. [PMID: 21429970 DOI: 10.1152/ajprenal.00716.2010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Aristolochic acids (AA) are plant-derived nephrotoxins and carcinogens found in traditional medicines and herbal remedies. AA causes aristolochic acid nephropathy (AAN) and is a suspected environmental agent in Balkan endemic nephropathy (BEN) and its associated upper urothelial cancer. Approximately 5-10% of individuals exposed to AA develop renal insufficiency and/or cancer; thus a genetic predisposition to AA sensitivity has been proposed. The mouse is an established animal model of AAN, and inbred murine strains vary in AA sensitivity, confirming the genetic predisposition. We mapped quantitative trait loci (QTL) correlated with proximal tubule dysfunction after exposure to AA in an F2 population of mice, derived from breeding an AA-resistant strain (C57BL/6J) and an AA-sensitive strain (DBA/2J). A single main QTL was identified on chromosome 4 (Aanq1); three other interacting QTLs, (Aanq2-4) also were detected. The Aanq1 region was also detected in untreated mice, raising the possibility that preexisting differences in proximal tubule function may affect the severity of AA-elicited toxicity. This study lays the groundwork for identifying the genetic pathways contributing to AA sensitivity in the mouse and will further our understanding of human susceptibility to AA found widely in traditional medicines.
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Affiliation(s)
- Thomas A Rosenquist
- Department of Pharmacological Sciences, School of Medicine, State University of New York at Stony Brook, Stony Brook, New York 11794-8651, USA.
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17
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Zsila F. Circular dichroism spectroscopy is a sensitive tool for investigation of bilirubin-enzyme interactions. Biomacromolecules 2010; 12:221-7. [PMID: 21141881 DOI: 10.1021/bm1012103] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Noncovalent complex formation of unconjugated bilirubin with various enzymes has been demonstrated by measuring induced circular dichroism (ICD) peaks associated with the pigment VIS absorption band. Preferential binding of the P- or M-helical conformer of bilirubin to dehydrogenases, catalase, alkaline phosphatase, and α-chymotrypsin is responsible for the characteristic exciton CD couplet that undergoes remarkable changes upon the addition of enzymatic cofactors (NADH, AMP) and an inhibitor (acridine). Alterations of the ICD spectra refer to a direct binding competition between bilirubin and NADH for a common binding site on alcohol dehydrogenase and catalase, suggesting a potential mechanism for the inhibitory effect of BR reported on NAD(P)H dependent enzymes. NADH and bilirubin form a ternary complex with glutamate dehydrogenase indicated by peculiar CD spectral changes that are proposed to be generated by allosteric mechanism. α-chymotrypsin binds bilirubin in its catalytic site, as indicated by CD displacement experiments performed with the competitive inhibitor acridine. Surprisingly, the closely related trypsin does not induce any CD signal with bilirubin. Taking into consideration the clinically relevant but controversial and poorly understood areas of bilirubin biochemistry, the fast and simple CD spectroscopic approach presented here may help to unfold diverse physiological and pathophysiological roles of BR on a molecular level.
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Affiliation(s)
- Ferenc Zsila
- Department of Molecular Pharmacology, Institute of Biomolecular Chemistry, Chemical Research Center, H-1025 Budapest, Pusztaszeri út 59-67, Hungary.
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Fragment-based discovery of selective inhibitors of the Mycobacterium tuberculosis protein tyrosine phosphatase PtpA. Bioorg Med Chem Lett 2009; 19:6851-4. [PMID: 19889539 DOI: 10.1016/j.bmcl.2009.10.090] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2009] [Revised: 10/20/2009] [Accepted: 10/21/2009] [Indexed: 11/23/2022]
Abstract
The development of low muM inhibitors of the Mycobacterium tuberculosis phosphatase PtpA is reported. The most potent of these inhibitors (K(i)=1.4+/-0.3 microM) was found to be selective when tested against a panel of human tyrosine and dual-specificity phosphatases (11-fold vs the highly homologous HCPtpA, and >70-fold vs all others tested). Modeling the inhibitor-PtpA complexes explained the structure-activity relationships observed in vitro and revealed further possibilities for compound development.
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An alpha-1-acid glycoprotein-like protein as a major component of the ovarian cavity fluid of viviparous fish, Neoditrema ransonnetii (Perciformes, Embiotocidae). Comp Biochem Physiol A Mol Integr Physiol 2009; 153:222-9. [PMID: 19245844 DOI: 10.1016/j.cbpa.2009.02.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2008] [Revised: 02/12/2009] [Accepted: 02/12/2009] [Indexed: 11/26/2022]
Abstract
Developing fetuses of surfperch (Neoditrema ransonnetii, Perciformes; Embiotocidae) are retained in the ovarian cavity until birth, where they are surrounded by ovarian cavity fluid (OCF). Expecting the OCF to have key roles in maintaining pregnancy, we purified and characterized a major glycoprotein of 51 kDa in the OCF of surfperch. On the basis of the N-terminal amino acid sequence, we cloned and sequenced a full-length cDNA. The deduced sequence comprises 214 amino acids (aa) including a signal peptide of 20 aa and a mature protein of 194 aa. This protein had an extremely low pI (below 2.8) and extraordinarily high glycosylation rate (more than 50%), characteristics being shared with alpha-1-acid glycoprotein (AGP), a member of the lipocalin superfamily. A homology search and phylogenetic analysis indicated that the 51 kDa protein and tributyltin-binding protein found in Japanese flounder are the closest known relatives of AGP. We therefore named the protein nrF-AGP. Messenger RNA of nrF-AGP was expressed intensively in the liver, but not at all in the ovarian tissue. Because nrF-AGP is the most salient component in OCF but not in plasma, we reasoned that it was selectively sequestered from blood to the ovarian cavity in pregnant females, and consequently, plays crucial roles in pregnancy.
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HAGINAKA J. Recent progresses in protein-based chiral stationary phases for enantioseparations in liquid chromatography☆. J Chromatogr B Analyt Technol Biomed Life Sci 2008; 875:12-9. [DOI: 10.1016/j.jchromb.2008.05.022] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2008] [Revised: 05/02/2008] [Accepted: 05/11/2008] [Indexed: 10/22/2022]
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21
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Organogold complexes probe a large β-barrel cavity for human serum α1-acid glycoprotein. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2008; 1784:1106-14. [DOI: 10.1016/j.bbapap.2008.03.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2008] [Revised: 03/20/2008] [Accepted: 03/24/2008] [Indexed: 11/22/2022]
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Zsila F, Mády G. Biliverdin is the endogenous ligand of human serum alpha1-acid glycoprotein. Biochem Biophys Res Commun 2008; 372:503-7. [PMID: 18510947 DOI: 10.1016/j.bbrc.2008.05.090] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2008] [Accepted: 05/18/2008] [Indexed: 11/29/2022]
Abstract
alpha(1)-Acid glycoprotein (AAG), an acute phase component of the human serum, is a prominent member of the lipocalin family of proteins showing inflammatory/immunomodulatory activities and promiscuous drug binding properties. Both three-dimensional structure of AAG and its precise biological function are still unknown and only a few endogenous AAG ligands have been described to date. CD spectroscopic studies performed with commercial AAG and the separated genetic variants revealed high-affinity binding of biliverdin (BV) and biliverdin dimethyl ester to the 'F1/S' fraction of the protein. The preferential accommodation of the right-handed, P-helicity conformers of the pigments by the protein matrix resulted in strong induced CD activity, which was utilized for estimation of the binding parameters and to locate the binding site. It was concluded that both pigments are bound in the central beta-barrel cavity of AAG, held principally by hydrophobic interactions. Possible biological implications of the BV binding ability of AAG with special emphasis on the heme oxygenase-1 pathway are discussed.
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Affiliation(s)
- Ferenc Zsila
- Chemical Research Center, Hungarian Academy of Sciences, Institute of Biomolecular Chemistry, H-1025 Budapest, Pusztaszeri út 59-67, Hungary.
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Zsila F, Iwao Y. The drug binding site of human α1-acid glycoprotein: Insight from induced circular dichroism and electronic absorption spectra. Biochim Biophys Acta Gen Subj 2007; 1770:797-809. [PMID: 17321687 DOI: 10.1016/j.bbagen.2007.01.009] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2006] [Revised: 01/16/2007] [Accepted: 01/23/2007] [Indexed: 11/29/2022]
Abstract
Human alpha(1)-acid glycoprotein (AGP) is an important drug binding plasma protein which affects pharmacokinetical properties of various therapeutic agents. For the first time, interpretation of the induced circular dichroism (ICD) spectra of drug-AGP complexes is presented yielding valuable information on the protein binding environment. ICD spectra were obtained by novel ligands of which AGP induced optical activity have never been reported (primaquine, mefloquine, propranolol, terazosin, carbamazepine, rhodamine B) and by re-investigation of ICD spectra of protein-bound drugs published earlier (chlorpromazine, dipyridamole, prazosin). Spectroscopic features of the ICD and absorption bands of drugs combined with native AGP indicated chiral non-degenerate exciton coupling between the guest chromophore and the indole ring of an adjacent tryptophan (Trp) residue. Results of additional CD experiments performed by using recombinant AGP mutants showed no changes in the ligand binding ability of W122A in sharp contrast with the W25A which was unable to induce extrinsic CD signal with either ligand. Thus, these findings unequivocally prove that, likely via pi-pi stacking mechanism, Trp25 is essentially involved in the AGP binding of drugs studied here as well as of related compounds. Survey of the AGP binding data published in the literature support this conclusion. Our results provide a fast and efficient spectroscopic tool to determine the inclusion of ligand molecules into the beta-barrel cavity of AGP where the conserved Trp25 is located and might be useful in ligand-binding studies of other lipocalin proteins.
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Affiliation(s)
- Ferenc Zsila
- Department of Molecular Pharmacology, Institute of Biomolecular Chemistry, Chemical Research Center, Budapest, P.O. Box 17, H-1525, Hungary.
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Suresh DV, Mahesha HG, Rao AGA, Srinivasan K. Binding of bioactive phytochemical piperine with human serum albumin: A spectrofluorometric study. Biopolymers 2007; 86:265-75. [PMID: 17407131 DOI: 10.1002/bip.20735] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Piperine, the bioactive alkaloid compound of the spice black pepper (Piper nigrum) exhibits a wide range of beneficial physiological and pharmacological activities. Being essentially water-insoluble, piperine is presumed to be assisted by serum albumin for its transport in blood. In this study, the binding of piperine to serum albumin was examined by employing steady state and time resolved fluorescence techniques. Binding constant for the interaction of piperine with human serum albumin, which was invariant with temperature in the range of 17-47 degrees C, was found to be 0.5 x 10(5)M(-1), having stoichiometry of 1:1. At 27 degrees C, the van't Hoff enthalpy DeltaH degrees was zero; DeltaS degrees and DeltaG degrees were found to be 21.4 cal mol(-1) K(-1) and -6.42 kcal mol(-1). The binding constant increased with the increase of ionic strength from 0.1 to 1.0M of sodium chloride. The decrease of Stern-Volmer constant with increase of temperature suggested that the fluorescence quenching is static. Piperine fluorescence showed a blue shift upon binding to serum albumin, which reverted with the addition of ligands -triiodobenzoic acid and hemin. The distance between piperine and tryptophan after binding was found to be 2.79 nm by Förster type resonance energy transfer calculations. The steady state and time resolved fluorescence measurements suggest the binding of piperine to the subdomain IB of serum albumin. These observations are significant in understanding the transport of piperine in blood under physiological conditions.
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Affiliation(s)
- Dodda Venkatanna Suresh
- Department of Biochemistry and Nutrition, Central Food Technological Research Institute, Mysore 570 020, Karnataka, India
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