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Ötvös F, Szűcs E, Urai Á, Köteles I, Szabó PT, Varga ZK, Gombos D, Hosztafi S, Benyhe S. Synthesis and biochemical evaluation of 17-N-beta-aminoalkyl-4,5α-epoxynormorphinans. Sci Rep 2023; 13:20305. [PMID: 37985681 PMCID: PMC10660610 DOI: 10.1038/s41598-023-46317-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 10/30/2023] [Indexed: 11/22/2023] Open
Abstract
Opiate alkaloids and their synthetic derivatives are still widely used in pain management, drug addiction, and abuse. To avoid serious side effects, compounds with properly designed pharmacological profiles at the opioid receptor subtypes are long needed. Here a series of 17-N-substituted derivatives of normorphine and noroxymorphone analogues with five- and six-membered ring substituents have been synthesized for structure-activity study. Some compounds showed nanomolar affinity to MOR, DOR and KOR in in vitro competition binding experiments with selective agonists [3H]DAMGO, [3H]Ile5,6-deltorphin II and [3H]HS665, respectively. Pharmacological characterization of the compounds in G-protein signaling was determined by [35S]GTPγS binding assays. The normorphine analogues showed higher affinity to KOR compared to MOR and DOR, while most of the noroxymorphone derivatives did not bind to KOR. The presence of 14-OH substituent resulted in a shift in the pharmacological profiles in the agonist > partial agonist > antagonist direction compared to the parent compounds. A molecular docking-based in silico method was also applied to estimate the pharmacological profile of the compounds. Docking energies and the patterns of the interacting receptor atoms, obtained with experimentally determined active and inactive states of MOR, were used to explain the observed pharmacological features of the compounds.
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Affiliation(s)
- Ferenc Ötvös
- Institute of Biochemistry, HUN-REN Biological Research Centre, Temesvári Krt. 62, 6726, Szeged, Hungary.
| | - Edina Szűcs
- Institute of Biochemistry, HUN-REN Biological Research Centre, Temesvári Krt. 62, 6726, Szeged, Hungary
| | - Ákos Urai
- Institute of Pharmaceutical Chemistry, Semmelweis Medical University, Hőgyes Endre Utca 9, 1092, Budapest, Hungary
| | - István Köteles
- Institute of Pharmaceutical Chemistry, Semmelweis Medical University, Hőgyes Endre Utca 9, 1092, Budapest, Hungary
- Department of Chemistry and Molecular Biology, University of Gothenburg, Medicinaregatan 19, 41390, Göteborg, Sweden
| | - Pál T Szabó
- Research Centre for Natural Sciences, MS Metabolomics Research Laboratory, Magyar Tudósok Krt. 2, 1117, Budapest, Hungary
| | - Zsuzsanna Katalin Varga
- Institute of Biochemistry, HUN-REN Biological Research Centre, Temesvári Krt. 62, 6726, Szeged, Hungary
- Theoretical Medical Doctoral School, Faculty of Medicine, University of Szeged, 6726, Szeged, Hungary
| | - Dávid Gombos
- Institute of Biochemistry, HUN-REN Biological Research Centre, Temesvári Krt. 62, 6726, Szeged, Hungary
- Theoretical Medical Doctoral School, Faculty of Medicine, University of Szeged, 6726, Szeged, Hungary
| | - Sándor Hosztafi
- Institute of Pharmaceutical Chemistry, Semmelweis Medical University, Hőgyes Endre Utca 9, 1092, Budapest, Hungary
| | - Sándor Benyhe
- Institute of Biochemistry, HUN-REN Biological Research Centre, Temesvári Krt. 62, 6726, Szeged, Hungary.
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2
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Deák A, Szabó PT, Bednaříková V, Cihlář J, Demeter A, Remešová M, Colacino E, Čelko L. The first solid-state route to luminescent Au(I)-glutathionate and its pH-controlled transformation into ultrasmall oligomeric Au 10-12(SG) 10-12 nanoclusters for application in cancer radiotheraphy. Front Chem 2023; 11:1178225. [PMID: 37342159 PMCID: PMC10277803 DOI: 10.3389/fchem.2023.1178225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 05/02/2023] [Indexed: 06/22/2023] Open
Abstract
There is still a need for synthetic approaches that are much faster, easier to scale up, more robust and efficient for generating gold(I)-thiolates that can be easily converted into gold-thiolate nanoclusters. Mechanochemical methods can offer significantly reduced reaction times, increased yields and straightforward recovery of the product, compared to the solution-based reactions. For the first time, a new simple, rapid and efficient mechanochemical redox method in a ball-mill was developed to produce the highly luminescent, pH-responsive Au(I)-glutathionate, [Au(SG)]n. The efficient productivity of the mechanochemical redox reaction afforded orange luminescent [Au(SG)]n in isolable amounts (mg scale), usually not achieved by more conventional methods in solution. Then, ultrasmall oligomeric Au10-12(SG)10-12 nanoclusters were prepared by pH-triggered dissociation of [Au(SG)]n. The pH-stimulated dissociation of the Au(I)-glutathionate complex provides a time-efficient synthesis of oligomeric Au10-12(SG)10-12 nanoclusters, it avoids high-temperature heating or the addition of harmful reducing agent (e.g., carbon monoxide). Therefore, we present herein a new and eco-friendly methodology to access oligomeric glutathione-based gold nanoclusters, already finding applications in biomedical field as efficient radiosensitizers in cancer radiotherapy.
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Affiliation(s)
- Andrea Deák
- Supramolecular Chemistry Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Budapest, Hungary
| | - Pál T. Szabó
- Centre for Structure Study, Research Centre for Natural Sciences, Budapest, Hungary
| | - Vendula Bednaříková
- High-Performance Materials and Coatings for Industry Research Group, Central European Institute of Technology, Brno University of Technology, Brno, Czechia
| | - Jaroslav Cihlář
- High-Performance Materials and Coatings for Industry Research Group, Central European Institute of Technology, Brno University of Technology, Brno, Czechia
| | - Attila Demeter
- Renewable Energy Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Budapest, Hungary
| | - Michaela Remešová
- High-Performance Materials and Coatings for Industry Research Group, Central European Institute of Technology, Brno University of Technology, Brno, Czechia
| | | | - Ladislav Čelko
- High-Performance Materials and Coatings for Industry Research Group, Central European Institute of Technology, Brno University of Technology, Brno, Czechia
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3
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Adorján Á, Mayer PJ, Szabó PT, Holczbauer T, London G. Metal-free synthesis of indenone derivatives from ortho-alkynylaryl ketones mediated by the combination of dialkyl phosphonates and CBr 4. SYNTHETIC COMMUN 2022. [DOI: 10.1080/00397911.2022.2122725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Áron Adorján
- MTA TTK Lendület Functional Organic Materials Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Budapest, Hungary
| | - Péter J. Mayer
- MTA TTK Lendület Functional Organic Materials Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Budapest, Hungary
- Institute of Chemistry, University of Szeged, Szeged, Hungary
| | - Pál T. Szabó
- MS Metabolomics Research Group, Centre for Structural Science, Research Centre for Natural Sciences, Budapest, Hungary
| | - Tamás Holczbauer
- Institute of Organic Chemistry, Centre for Structural Science, Research Centre for Natural Sciences, Budapest, Hungary
| | - Gábor London
- MTA TTK Lendület Functional Organic Materials Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Budapest, Hungary
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4
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Kovács Z, Skatchkov SN, Veh RW, Szabó Z, Németh K, Szabó PT, Kardos J, Héja L. Critical Role of Astrocytic Polyamine and GABA Metabolism in Epileptogenesis. Front Cell Neurosci 2022; 15:787319. [PMID: 35069115 PMCID: PMC8770812 DOI: 10.3389/fncel.2021.787319] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 12/09/2021] [Indexed: 12/22/2022] Open
Abstract
Accumulating evidence indicate that astrocytes are essential players of the excitatory and inhibitory signaling during normal and epileptiform activity via uptake and release of gliotransmitters, ions, and other substances. Polyamines can be regarded as gliotransmitters since they are almost exclusively stored in astrocytes and can be released by various mechanisms. The polyamine putrescine (PUT) is utilized to synthesize GABA, which can also be released from astrocytes and provide tonic inhibition on neurons. The polyamine spermine (SPM), synthesized form PUT through spermidine (SPD), is known to unblock astrocytic Cx43 gap junction channels and therefore facilitate astrocytic synchronization. In addition, SPM released from astrocytes may also modulate neuronal NMDA, AMPA, and kainate receptors. As a consequence, astrocytic polyamines possess the capability to significantly modulate epileptiform activity. In this study, we investigated different steps in polyamine metabolism and coupled GABA release to assess their potential to control seizure generation and maintenance in two different epilepsy models: the low-[Mg2+] model of temporal lobe epilepsy in vitro and in the WAG/Rij rat model of absence epilepsy in vivo. We show that SPM is a gliotransmitter that is released from astrocytes and significantly contributes to network excitation. Importantly, we found that inhibition of SPD synthesis completely prevented seizure generation in WAG/Rij rats. We hypothesize that this antiepileptic effect is attributed to the subsequent enhancement of PUT to GABA conversion in astrocytes, leading to GABA release through GAT-2/3 transporters. This interpretation is supported by the observation that antiepileptic potential of the Food and Drug Administration (FDA)-approved drug levetiracetam can be diminished by specifically blocking astrocytic GAT-2/3 with SNAP-5114, suggesting that levetiracetam exerts its effect by increasing surface expression of GAT-2/3. Our findings conclusively suggest that the major pathway through which astrocytic polyamines contribute to epileptiform activity is the production of GABA. Modulation of astrocytic polyamine levels, therefore, may serve for a more effective antiepileptic drug development in the future.
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Affiliation(s)
- Zsolt Kovács
- Department of Biology, ELTE Eötvös Loránd University, Savaria University Centre, Szombathely, Hungary
| | - Serguei N. Skatchkov
- Department of Physiology, Universidad Central Del Caribe, Bayamon, PR, United States
- Department of Biochemistry, Universidad Central Del Caribe, Bayamon, PR, United States
| | - Rüdiger W. Veh
- Institut für Zell- und Neurobiologie, Centrum 2, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Zsolt Szabó
- Functional Pharmacology Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Eötvös Loránd Research Network, Budapest, Hungary
| | - Krisztina Németh
- MS Metabolomics Research Group, Centre for Structural Study, Research Centre for Natural Sciences, Eötvös Loránd Research Network, Budapest, Hungary
| | - Pál T. Szabó
- MS Metabolomics Research Group, Centre for Structural Study, Research Centre for Natural Sciences, Eötvös Loránd Research Network, Budapest, Hungary
| | - Julianna Kardos
- Functional Pharmacology Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Eötvös Loránd Research Network, Budapest, Hungary
| | - László Héja
- Functional Pharmacology Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Eötvös Loránd Research Network, Budapest, Hungary
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Németh K, Mészáros K, Szabó B, Butz H, Arányi T, Szabó PT. A relative quantitation method for measuring DNA methylation and hydroxymethylation using guanine as an internal standard. Anal Methods 2021; 13:4614-4622. [PMID: 34528637 DOI: 10.1039/d1ay00897h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Global DNA methylation and hydroxymethylation play an important role in gene expression. They can be connected with several diseases. The modification status could be a biomarker to determine the status of disease. A fast, easy and accurate liquid chromatography - tandem mass spectrometry method has been developed for the precise quantitation of 5-methylcytosine and 5-hydroxymethylcytosine. Formic acid was used for the hydrolysis of the DNA strand resulting in nucleobases. These polar hydrolysis products were separated on a normal phase column using reversed phase eluents in inverse gradient mode. Multiple reaction monitoring was applied to achieve high selectivity and sensitivity for the quantitation. A new relative quantitation model was developed by using guanine, as an internal standard, present in samples. The new method was successfully validated with excellent accuracy and precision values in the range of 0.005-0.5% for 5hmC and 1-15% for 5mC. The main advantages of this quantitation method are that, due to relative quantitation, calibration curves can be used without reacquiring the calibration points and no additional isotope labeled internal standards are required. The method was tested to identify the concentrations of 5mC and 5hmC in various sample types. The lowest level of DNA sample required in the case of 0.005% 5hmC is 0.5 μg.
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Affiliation(s)
- Krisztina Németh
- Institute of Chemistry, Eötvös Loránd University, Pázmány Péter stny. 1/A, H-1117 Budapest, Hungary
- MS Metabolomics Research Group, Centre for Structural Study, Research Centre for Natural Sciences, Eötvös Loránd Research Network, Magyar tudósok krt. 2, H-1117 Budapest, Hungary.
| | - Katalin Mészáros
- Hereditary Tumours Research Group, Eötvös Loránd Research Network, Semmelweis University, Szentkirályi u. 46, H-1088 Budapest, Hungary
| | - Borbála Szabó
- Department of Laboratory Medicine, Semmelweis University, Bókay János u. 53-54, H-1089 Budapest, Hungary
| | - Henriett Butz
- Hereditary Tumours Research Group, Eötvös Loránd Research Network, Semmelweis University, Szentkirályi u. 46, H-1088 Budapest, Hungary
- Department of Laboratory Medicine, Semmelweis University, Bókay János u. 53-54, H-1089 Budapest, Hungary
| | - Tamás Arányi
- Institute of Enzymology, Research Centre for Natural Sciences, Eötvös Loránd Research Network, Magyar tudósok krt. 2, H-1117 Budapest, Hungary
- Department of Molecular Biology, Semmelweis University, Tűzoltó u. 37-47, H-1094 Budapest, Hungary
| | - Pál T Szabó
- MS Metabolomics Research Group, Centre for Structural Study, Research Centre for Natural Sciences, Eötvös Loránd Research Network, Magyar tudósok krt. 2, H-1117 Budapest, Hungary.
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6
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Deák A, Jobbágy C, Demeter A, Čelko L, Cihlář J, Szabó PT, Ábrányi-Balogh P, Crawford DE, Virieux D, Colacino E. Mechanochemical synthesis of mononuclear gold(I) halide complexes of diphosphine ligands with tuneable luminescent properties. Dalton Trans 2021; 50:13337-13344. [PMID: 34608904 DOI: 10.1039/d1dt01751a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A mechanochemical method is reported for the synthesis of Au(diphos)X complexes of diphosphine (diphos = XantPhos and N-XantPhos) ligands and halide ions (X = Cl and I). The Au(XantPhos)X (1: X = Cl; 2: X = I) and Au(N-XantPhos)Cl (3) complexes exhibited either yellowish green (1) or bluish green (2) emission, whereas 3 was seemingly non-emissive in the solid state at room temperature. Blue- (2B) and bluish green (2G) luminescent concomitant solvates of 2 were obtained by recrystallization. Luminescent colour changes from blue (2B) or bluish green (2G) to yellow were observed when these forms were subjected to mechanical stimulus, while the original emission colour can be recovered in the presence of solvent vapours. Moreover, the luminescence of 2B can be reversibly altered between blue and yellow by heating/cooling-cycles. These results demonstrate the power of mechanochemistry in the rapid (4 min reaction time), efficient (up to 98% yield) and greener synthesis of luminescent and stimuli-responsive gold(I) complexes.
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Affiliation(s)
- Andrea Deák
- Supramolecular Chemistry Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Eötvös Loránd Research Network (ELKH), Magyar Tudósok körútja 2, 1117 Budapest, Hungary.
| | - Csaba Jobbágy
- Supramolecular Chemistry Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Eötvös Loránd Research Network (ELKH), Magyar Tudósok körútja 2, 1117 Budapest, Hungary.
| | - Attila Demeter
- Renewable Energy Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Eötvös Loránd Research Network (ELKH), Magyar Tudósok körútja 2, 1117 Budapest, Hungary
| | - Ladislav Čelko
- Central European Institute of Technology, Brno University of Technology, Purkyňova 123, 61200 Brno, Czech Republic
| | - Jaroslav Cihlář
- Central European Institute of Technology, Brno University of Technology, Purkyňova 123, 61200 Brno, Czech Republic
| | - Pál T Szabó
- Centre for Structure Study, Research Centre for Natural Sciences, Eötvös Loránd Research Network (ELKH), 1117 Budapest, Magyar Tudósok körútja 2, Hungary
| | - Péter Ábrányi-Balogh
- Medicinal Chemistry Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Eötvös Loránd Research Network (ELKH), 1117 Budapest, Magyar Tudósok körútja 2, Hungary
| | - Deborah E Crawford
- School of Chemistry and Biosciences, University of Bradford Richmond Road, BD7 1DP, Bradford, UK
| | - David Virieux
- ICGM, Univ Montpellier CNRS, ENSCM, Montpellier, France.
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Pilipecz MV, Varga TR, Králl P, Vincze Z, Mucsi Z, Deme R, Szabó PT, Nemes P. Simple route to new oxadiazaboroles and oxadiazoles via amidoximes. SYNTHETIC COMMUN 2020. [DOI: 10.1080/00397911.2020.1755439] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Mihály V. Pilipecz
- Department of Chemistry, University of Veterinary Medicine, Budapest, Hungary
| | - Tamás R. Varga
- Department of Chemistry, University of Veterinary Medicine, Budapest, Hungary
| | - Péter Králl
- Department of Chemistry, University of Veterinary Medicine, Budapest, Hungary
| | - Zoltán Vincze
- Department of Chemistry, University of Veterinary Medicine, Budapest, Hungary
| | | | - Ruth Deme
- Department of Pharmaceutical Chemistry, Semmelweis University of Medicine, Budapest, Hungary
| | - Pál T. Szabó
- Instrumentation Center, Hungarian Academy of Sciences Research Centre for Natural Sciences, Budapest, Hungary
| | - Péter Nemes
- Department of Chemistry, University of Veterinary Medicine, Budapest, Hungary
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Szűcs E, Marton J, Szabó Z, Hosztafi S, Kékesi G, Tuboly G, Bánki L, Horváth G, Szabó PT, Tömböly C, Varga ZK, Benyhe S, Ötvös F. Synthesis, biochemical, pharmacological characterization and in silico profile modelling of highly potent opioid orvinol and thevinol derivatives. Eur J Med Chem 2020; 191:112145. [PMID: 32092588 DOI: 10.1016/j.ejmech.2020.112145] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 01/22/2020] [Accepted: 02/12/2020] [Indexed: 02/02/2023]
Abstract
Morphine and its derivatives play inevitably important role in the μ-opioid receptor (MOR) targeted antinociception. A structure-activity relationship study is presented for novel and known orvinol and thevinol derivatives with varying 3-O, 6-O, 17-N and 20-alkyl substitutions starting from agonists, antagonists and partial agonists. In vitro competition binding experiments with [3H]DAMGO showed low subnanomolar affinity to MOR. Generally, 6-O-demethylation increased the affinity toward MOR and decreased the efficacy changing the pharmacological profile in some cases. In vivo tests in osteoarthritis inflammation model showed significant antiallodynic effects of thevinol derivatives while orvinol derivatives did not. The pharmacological character was modelled by computational docking to both active and inactive state models of MOR. Docking energy difference for the two states separates agonists and antagonists well while partial agonists overlapped with them. An interaction pattern of the ligands, involving the interacting receptor atoms, showed more efficient separation of the pharmacological profiles. In rats, thevinol derivatives showed antiallodynic effect in vivo. The orvinol derivatives, except for 6-O-desmethyl-dihydroetorfin (2c), did not show antiallodynic effect.
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Affiliation(s)
- Edina Szűcs
- Institute of Biochemistry, Biological Research Center, Temesvári krt. 62, H-6726, Szeged, Hungary; Doctoral School of Theoretical Medicine, Faculty of Medicine, University of Szeged, Dóm tér 10, H-6720, Szeged, Hungary
| | - János Marton
- ABX Advanced Biochemical Compounds, Biomedizinische Forschungsreagenzien GmbH, Heinrich-Glaeser-Strasse 10-14, D-01454, Radeberg, Germany
| | - Zoltán Szabó
- Royal Institute of Technology (KTH), School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Chemistry, Organic Chemistry, S-100 44, Stockholm, Sweden
| | - Sándor Hosztafi
- Institute of Pharmaceutical Chemistry, Semmelweis Medical University, Hőgyes Endre utca 9, H-1092, Budapest, Hungary
| | - Gabriella Kékesi
- Department of Physiology, Faculty of Medicine, University of Szeged, Dóm tér 10, H-6720, Szeged, Hungary
| | - Gábor Tuboly
- Department of Neurology, Faculty of Medicine, University of Szeged, Semmelweis u 6, H-6725, Szeged, Hungary
| | - László Bánki
- Department of Traumatology, Faculty of Medicine, University of Szeged, Semmelweis u 6, H-6725, Szeged, Hungary
| | - Gyöngyi Horváth
- Department of Physiology, Faculty of Medicine, University of Szeged, Dóm tér 10, H-6720, Szeged, Hungary
| | - Pál T Szabó
- Research Centre for Natural Sciences, MS Metabolomics Research Laboratory, H-1117, Budapest, Magyar tudósok krt. 2, Hungary
| | - Csaba Tömböly
- Institute of Biochemistry, Biological Research Center, Temesvári krt. 62, H-6726, Szeged, Hungary
| | - Zsuzsanna Katalin Varga
- Institute of Biochemistry, Biological Research Center, Temesvári krt. 62, H-6726, Szeged, Hungary; Doctoral School of Theoretical Medicine, Faculty of Medicine, University of Szeged, Dóm tér 10, H-6720, Szeged, Hungary
| | - Sándor Benyhe
- Institute of Biochemistry, Biological Research Center, Temesvári krt. 62, H-6726, Szeged, Hungary
| | - Ferenc Ötvös
- Institute of Biochemistry, Biological Research Center, Temesvári krt. 62, H-6726, Szeged, Hungary.
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Cserepes M, Türk D, Tóth S, Pape VFS, Gaál A, Gera M, Szabó JE, Kucsma N, Várady G, Vértessy BG, Streli C, Szabó PT, Tovari J, Szoboszlai N, Szakács G. Unshielding Multidrug Resistant Cancer through Selective Iron Depletion of P-Glycoprotein-Expressing Cells. Cancer Res 2019; 80:663-674. [PMID: 31888888 DOI: 10.1158/0008-5472.can-19-1407] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 11/02/2019] [Accepted: 12/18/2019] [Indexed: 11/16/2022]
Abstract
Clinical evidence shows that following initial response to treatment, drug-resistant cancer cells frequently evolve and, eventually, most tumors become resistant to all available therapies. We compiled a focused library consisting of >500 commercially available or newly synthetized 8-hydroxyquinoline (8OHQ) derivatives whose toxicity is paradoxically increased rather than decreased by the activity of P-glycoprotein (Pgp), a transporter conferring multidrug resistance (MDR). Here, we deciphered the mechanism of action of NSC297366 that shows exceptionally strong Pgp-potentiated toxicity. Treatment of cells with NSC297366 resulted in changes associated with the activity of potent anticancer iron chelators. Strikingly, iron depletion was more pronounced in MDR cells due to the Pgp-mediated efflux of NSC297366-iron complexes. Our results indicate that iron homeostasis can be targeted by MDR-selective compounds for the selective elimination of multidrug resistant cancer cells, setting the stage for a therapeutic approach to fight transporter-mediated drug resistance. SIGNIFICANCE: Modulation of the MDR phenotype has the potential to increase the efficacy of anticancer therapies. These findings show that the MDR transporter is a "double-edged sword" that can be turned against resistant cancer.
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Affiliation(s)
- Mihály Cserepes
- Institute of Enzymology, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary.,Department of Experimental Pharmacology, National Institute of Oncology, Budapest, Hungary
| | - Dóra Türk
- Institute of Enzymology, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary.,Department of Experimental Pharmacology, National Institute of Oncology, Budapest, Hungary
| | - Szilárd Tóth
- Institute of Enzymology, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Veronika F S Pape
- Institute of Enzymology, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Anikó Gaál
- Institute of Enzymology, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary.,Institute of Chemistry, Eötvös Loránd University, Budapest, Hungary
| | - Melinda Gera
- Institute of Enzymology, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Judit E Szabó
- Institute of Enzymology, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Nóra Kucsma
- Institute of Enzymology, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - György Várady
- Institute of Enzymology, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Beáta G Vértessy
- Institute of Enzymology, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary.,Department of Applied Biotechnology and Food Sciences, BME Budapest University of Technology and Economics, Budapest, Hungary
| | | | - Pál T Szabó
- Instrumentation Centre, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Jozsef Tovari
- Department of Experimental Pharmacology, National Institute of Oncology, Budapest, Hungary
| | | | - Gergely Szakács
- Institute of Enzymology, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary. .,Institute of Cancer Research, Medical University of Vienna, Vienna, Austria
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10
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Kalapos-Kovács B, Juhász V, Temesszentandrási-Ambrus C, Magda B, Szabó PT, Antal I, Klebovich I, Krajcsi P. Baicalin is a substrate of OATP2B1 and OATP1B3. Phytother Res 2018; 32:1647-1650. [DOI: 10.1002/ptr.6095] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 01/10/2018] [Accepted: 03/24/2018] [Indexed: 01/27/2023]
Affiliation(s)
- Bernadett Kalapos-Kovács
- Department of Pharmaceutics; Semmelweis University; 7 Hőgyes E. utca Budapest Budapest H-1092 Hungary
- SOLVO Biotechnology; 2 Gyár utca Budaörs H-2040 Hungary
| | | | | | - Balázs Magda
- Institute of Organic Chemistry, Research Centre for Natural Sciences; Hungarian Academy of Sciences; 2 Magyar Tudósok körútja Budapest H-1117 Hungary
| | - Pál T. Szabó
- Institute of Organic Chemistry, Research Centre for Natural Sciences; Hungarian Academy of Sciences; 2 Magyar Tudósok körútja Budapest H-1117 Hungary
| | - István Antal
- Department of Pharmaceutics; Semmelweis University; 7 Hőgyes E. utca Budapest Budapest H-1092 Hungary
| | - Imre Klebovich
- Department of Pharmaceutics; Semmelweis University; 7 Hőgyes E. utca Budapest Budapest H-1092 Hungary
| | - Péter Krajcsi
- SOLVO Biotechnology; 2 Gyár utca Budaörs H-2040 Hungary
- Department of Morphology and Physiology. Faculty of Health Sciences; Semmelweis University; 17 Vas u Budapest H-1088 Hungary
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Magda B, Dobi Z, Mészáros K, Szabó É, Márta Z, Imre T, Szabó PT. Charged derivatization and on-line solid phase extraction to measure extremely low cortisol and cortisone levels in human saliva with liquid chromatography–tandem mass spectrometry. J Pharm Biomed Anal 2017; 140:223-231. [DOI: 10.1016/j.jpba.2017.03.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Revised: 03/06/2017] [Accepted: 03/15/2017] [Indexed: 10/24/2022]
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Demeter O, Fodor EA, Kállay M, Mező G, Németh K, Szabó PT, Kele P. A Double-Clicking Bis-Azide Fluorogenic Dye for Bioorthogonal Self-Labeling Peptide Tags. Chemistry 2016; 22:6382-8. [DOI: 10.1002/chem.201504939] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Indexed: 11/05/2022]
Affiliation(s)
- Orsolya Demeter
- Chemical Biology Research Group; Institute of Organic Chemistry; Research Centre for Natural Sciences; Hungarian Academy of Sciences; Magyar tudósok krt. 2 1117 Budapest Hungary
| | - Eszter A. Fodor
- Chemical Biology Research Group; Institute of Organic Chemistry; Research Centre for Natural Sciences; Hungarian Academy of Sciences; Magyar tudósok krt. 2 1117 Budapest Hungary
| | - Mihály Kállay
- MTA-BME “Lendület” Quantum Chemistry Research Group; Department of Physical Chemistry and Materials Science; Budapest University of Technology and Economics; P.O. Box 91 1521 Budapest Hungary
| | - Gábor Mező
- MTA-ELTE Research Group of Peptide Chemistry; Hungarian Academy of Sciences; Pázmány Péter sétány 1 a 1117 Budapest Hungary
| | - Krisztina Németh
- Chemical Biology Research Group; Institute of Organic Chemistry; Research Centre for Natural Sciences; Hungarian Academy of Sciences; Magyar tudósok krt. 2 1117 Budapest Hungary
| | - Pál T. Szabó
- MS Metabolomics Research Group; Institute of Organic Chemistry; Research Centre for Natural Sciences; Hungarian Academy of Sciences; Magyar tudósok krt. 2 1117 Budapest Hungary)
| | - Péter Kele
- Chemical Biology Research Group; Institute of Organic Chemistry; Research Centre for Natural Sciences; Hungarian Academy of Sciences; Magyar tudósok krt. 2 1117 Budapest Hungary
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Kalapos-Kovács B, Magda B, Jani M, Fekete Z, Szabó PT, Antal I, Krajcsi P, Klebovich I. Multiple ABC Transporters Efflux Baicalin. Phytother Res 2015; 29:1987-90. [DOI: 10.1002/ptr.5477] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Revised: 07/16/2015] [Accepted: 08/29/2015] [Indexed: 01/14/2023]
Affiliation(s)
| | - Balázs Magda
- Institute of Organic Chemistry, Research Centre for Natural Sciences; Hungarian Academy of Sciences (IOC RCNS HAS); Magyar Tudósok körútja 2. H-1117 Budapest Hungary
| | - Márton Jani
- SOLVO Biotechnology; Gyár utca 2. H-2040 Budaörs Hungary
| | - Zsolt Fekete
- SOLVO Biotechnology; Gyár utca 2. H-2040 Budaörs Hungary
| | - Pál T. Szabó
- Institute of Organic Chemistry, Research Centre for Natural Sciences; Hungarian Academy of Sciences (IOC RCNS HAS); Magyar Tudósok körútja 2. H-1117 Budapest Hungary
| | - István Antal
- Department of Pharmaceutics; Semmelweis University; Hőgyes E. utca 7. H-1092 Budapest Hungary
| | - Péter Krajcsi
- SOLVO Biotechnology; Gyár utca 2. H-2040 Budaörs Hungary
| | - Imre Klebovich
- Department of Pharmaceutics; Semmelweis University; Hőgyes E. utca 7. H-1092 Budapest Hungary
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Magda B, Márta Z, Imre T, Kalapos-Kovács B, Klebovich I, Fekete J, Szabó PT. Unexpected retention behavior of baicalin: Hydrophilic interaction like properties of a reversed-phase column. J Pharm Biomed Anal 2015; 111:119-25. [DOI: 10.1016/j.jpba.2015.03.037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Revised: 03/27/2015] [Accepted: 03/28/2015] [Indexed: 11/30/2022]
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Fülöp K, Jiang Q, Wetering KVD, Pomozi V, Szabó PT, Arányi T, Sarkadi B, Borst P, Uitto J, Váradi A. ABCC6 does not transport vitamin K3-glutathione conjugate from the liver: relevance to pathomechanisms of pseudoxanthoma elasticum. Biochem Biophys Res Commun 2011; 415:468-71. [PMID: 22056557 DOI: 10.1016/j.bbrc.2011.10.095] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Accepted: 10/21/2011] [Indexed: 10/15/2022]
Abstract
Vitamin K is a cofactor required for gamma-glutamyl carboxylation of several proteins regulating blood clotting, bone formation and soft tissue mineralization. Vitamin K3 is an important intermediate during conversion of the dietary vitamin K1 to the most abundant vitamin K2 form. It has been suggested that ABCC6 may have a role in transporting vitamin K or its derivatives from the liver to the periphery. This activity is missing in pseudoxanthoma elasticum, a genetic disorder caused by mutations in ABCC6 characterized by abnormal soft tissue mineralization. Here we examined the efflux of the glutathione conjugate of vitamin K3 (VK3GS) from the liver in wild type and Abcc6(-/-) mice, and in transport assays in vitro. We found in liver perfusion experiments that VK3GS is secreted into the inferior vena cava, but we observed no significant difference between wild type and Abcc6(-/-) animals. We overexpressed the human ABCC6 transporter in Sf9 insect and MDCKII cells and assayed its vitamin K3-conjugate transport activity in vitro. We found no measurable transport of VK3GS by ABCC6, whereas ABCC1 transported this compound at high rate in these assays. These results show that VK3GS is not the essential metabolite transported by ABCC6 from the liver and preventing the symptoms of pseudoxanthoma elasticum.
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Affiliation(s)
- Krisztina Fülöp
- Institute of Enzymology, Hungarian Academy of Sciences, Budapest, Hungary
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Brampton C, Yamaguchi Y, Vanakker O, Van Laer L, Chen LH, Thakore M, De Paepe A, Pomozi V, Szabó PT, Martin L, Váradi A, Le Saux O. Vitamin K does not prevent soft tissue mineralization in a mouse model of pseudoxanthoma elasticum. Cell Cycle 2011; 10:1810-20. [PMID: 21597330 DOI: 10.4161/cc.10.11.15681] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Pseudoxanthoma elasticum (PXE) is a heritable disease characterized by calcified elastic fibers in cutaneous, ocular, and vascular tissues. PXE is caused by mutations in ABCC6, which encodes a protein of the ATP-driven organic anion transporter family. The inability of this transporter to secrete its substrate into the circulation is the likely cause of PXE. Vitamin K plays a role in the regulation of mineralization processes as a co-factor in the carboxylation of calcification inhibitors such as Matrix Gla Protein (MGP). Vitamin K precursor or a conjugated form has been proposed as potential substrate(s) for ABCC6. We investigated whether an enriched diet of vitamin K1 or vitamin K2 (MK4) could stop or slow the disease progression in Abcc6 (-/-) mice. Abcc6 (-/-) mice were placed on a diet of either vitamin K1 or MK4 at 5 or 100 mg/kg at prenatal, 3 weeks or 3 months of age. Disease progression was quantified by measuring the calcium content of one side of the mouse muzzle skin and histological staining for calcium of the opposing side. Raising the vitamin K1 or MK4 content of the diet increased the concentration of circulating MK4 in the serum. However, this increase did not significantly affect the MGP carboxylation status or reduce its abnormal abundance, the total calcium content or the pathologic calcification in the whiskers of the 3 treatment groups compared to controls. Our findings showed that raising the dietary intake of vitamin K1 or MK4 was not beneficial in the treatment of PXE and suggested that the availability of vitamin K may not be a limiting factor in this pathology.
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Donkó A, Orient A, Szabó PT, Németh G, Vántus T, Kéri G, Orfi L, Hunyady L, Buday L, Geiszt M. Detection of hydrogen peroxide by lactoperoxidase-mediated dityrosine formation. Free Radic Res 2009; 43:440-5. [PMID: 19340621 DOI: 10.1080/10715760902859069] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The aim of this work was to study the dityrosine-forming activity of lactoperoxidase (LPO) and its potential application for measuring hydrogen peroxide (H2O2). It was observed that LPO was able to form dityrosine at low H2O2 concentrations. Since dityrosine concentration could be measured in a simple fluorimetric reaction, this activity of the enzyme was utilized for the measurement of H2O2 production in different systems. These experiments successfully measured the activity of NADPH oxidase 4 (Nox4) by this method. It was concluded that LPO-mediated dityrosine formation offers a simple way for H2O2 measurement.
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Affiliation(s)
- Agnes Donkó
- Department of Physiology, Semmelweis University, Faculty of Medicine, Budapest, Hungary
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Sztaricskai F, Batta G, Herczegh P, Balázs A, Jeko J, Roth E, Szabó PT, Kardos S, Rozgonyi F, Boda Z. A new series of glycopeptide antibiotics incorporating a squaric acid moiety. Synthesis, structural and antibacterial studies. J Antibiot (Tokyo) 2007; 59:564-82. [PMID: 17136889 DOI: 10.1038/ja.2006.77] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The aglycones of the antibiotics eremomycin, vancomycin and ristocetin (3, 4 and 6, respectively) were prepared by deglycosidation of the parent antibiotics with hydrogen fluoride, and complete assignation of their 1H, 13C and 15N spectra was performed. The squaric acid amide esters (11-14), were prepared from dimethyl squarate. The corresponding asymmetric diamides (16-19, 22, 23) were also synthesized using 4-phenylbenzylamine and triglycine. The advantage of the method is the high regioselectivity and that no protecting group strategy is required. Electrospray mass spectroscopic method was elaborated for the determination of the site of substitution of the modified antibiotics. The antibacterial activity of the prepared compounds is discussed in detail.
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Affiliation(s)
- Ferenc Sztaricskai
- Research Group for Antibiotics of the Hungarian Academy of Sciences, and Department of Pharmaceutical Chemistry, University of Debrecen, H-4010 Debrecen, PO.Box 70, Hungary.
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Imre T, Zsila F, Szabó PT. Electrospray mass spectrometric investigation of the binding of cis-parinaric acid to bovine beta-lactoglobulin and study of the ligand-binding site of the protein using limited proteolysis. Rapid Commun Mass Spectrom 2003; 17:2464-2470. [PMID: 14608614 DOI: 10.1002/rcm.1217] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The binding property of parinaric acid, a polyunsaturated fatty acid, to bovine beta-lactoglobulin, has been studied by electrospray ionization mass spectrometry. Stable complexation was observed under acidic conditions in a molar ratio of 1:1. Competitive complexation experiments were performed using saturated and unsaturated fatty acid standards with different chain lengths and number of double bonds to study the specificity of the interaction. It can be concluded that formation of the parinaric acid-lactoglobulin complex is preferred even if the molar concentration of the other fatty acids is ten times higher. In cases of specific complex formation the protein must have an active site that is a good acceptor for the ligand molecule. Limited trypsinolysis was performed on the lactoglobulin molecule to identify which part is responsible for the complexation. An intermediate tryptic fragment with molecular mass of 5200 Da was found to have the same ability to bind parinaric acid as the intact protein. This disulfide-bonded residue, [41-70]S-S[149-162], might thus be involved in the specific complexation of parinaric acid to beta-lactoglobulin. This conclusion is consistent with previous information on this binding site.
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Affiliation(s)
- Tímea Imre
- Department of Mass Spectrometry, Institute of Chemistry, Chemical Research Center, PO Box 17, 1525 Budapest, Hungary
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Zsila F, Imre T, Szabó PT, Bikádi Z, Simonyi M. Induced chirality upon binding of cis-parinaric acid to bovine beta-lactoglobulin: spectroscopic characterization of the complex. FEBS Lett 2002; 520:81-7. [PMID: 12044875 DOI: 10.1016/s0014-5793(02)02771-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Binding of the polyunsaturated cis-parinaric acid to bovine beta-lactoglobulin (BLG) was studied by circular dichroism (CD), electronic absorption spectroscopy and mass spectrometry methods. Upon protein binding, the UV absorption band of parinaric acid is red shifted by ca. 5 nm, showing hypochromism and reduced vibrational fine structure, suggesting that the ligand binds as a monomer in non-planar geometry. In the CD spectra measured at pH 7.36 and 8.5 a strong, negative Cotton band appears centered at 310 nm (Delta epsilon = -25 M(-1) cm(-1)) corresponding to the long-wavelength absorption band of cis-parinaric acid. The source of this induced optical activity is the helical distortion of the polyene chromophore caused by the chiral protein environment. From CD spectral data the value of the association constant was calculated to be 4.7 x 10(5) M(-1) at pH 7.36. CD and mass spectrometry measurements showed that parinaric acid binds weakly to BLG in acidic solution, though small peaks at mass 18,559 and 18,645 can be obtained in the reconstructed electrospray mass spectrum; these correspond to the binding of parinaric acid in 1:1 stoichiometry to both monomer variants of BLG B and A. The hydrophobic interior cavity of BLG was assigned as the primary binding site of cis-parinaric acid.
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Affiliation(s)
- Ferenc Zsila
- Department of Molecular Pharmacology, Institute of Chemistry, Chemical Research Center, P.O. Box 17, 1525 Budapest, Hungary.
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Szabó PT, Kele Z. Electrospray mass spectrometry of hydrophobic compounds using dimethyl sulfoxide and dimethylformamide as solvents. Rapid Commun Mass Spectrom 2001; 15:2415-2419. [PMID: 11746912 DOI: 10.1002/rcm.526] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The use of dimethyl sulfoxide (DMSO) and dimethylformamide (DMF) as solvents in electrospray ionization (ESI) is suggested for the analysis of hydrophobic compounds. Its use was shown to overcome solubility problems and resulted in good quality electrospray spectra of protected hydrophobic peptides, sugars and other hydrophobic compounds. Intense protonated and/or sodiated molecules were formed in positive ion mode while negative ion mode resulted in [M + 95](-) ions from DMSO and [M + Cl](-) ions from DMF in cases where no significant molecular ion related peaks could be observed applying commonly used protic solvents such as methanol or acetonitrile. Deuterium labeling (d6-DMSO), high resolution experiments and tandem mass spectrometric measurements showed that the methanesulfonic acid (MSA), present in DMSO as a common impurity, is responsible for the formation of protonated molecules in positive ion mode and for methane sulfonate anion adducts [M + 95](-) in negative ion mode.
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Affiliation(s)
- P T Szabó
- Chemical Research Center, Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 17, Hungary.
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Bartók M, Szabó PT, Bartók T, Szöllösi G, Balázsik K. Identification of new types of aluminium compounds by electrospray ionization mass spectrometry: oxonium cations. Rapid Commun Mass Spectrom 2001; 15:65-69. [PMID: 11135426 DOI: 10.1002/1097-0231(20010115)15:1<65::aid-rcm182>3.0.co;2-d] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Abstract
Several ethyl pyruvate and dihydrocinchonidine adducts, formed by non-covalent interactions with alkali cations, have been identified for the first time using electrospray ionization mass and tandem mass spectrometry. This type of adduct may have an important role in asymmetric reactions of pyruvates in the presence of cinchonas.
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Affiliation(s)
- M Bartók
- Department of Organic Chemistry, József Attila University, Dóm tér 8, H-6720 Szeged, Hungary.
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Abstract
Factor C, an extracellular signal protein of cellular differentiation, was studied and significant homology was found to several zinc finger-type regulatory proteins. The complete amino acid sequence, deduced from the gene, that encodes the protein, did not support the hypothesis that this protein might be a zinc finger-type regulatory protein. However, a theoretical single nucleotide insertion in the gene can result in another similarly sized protein containing about 20 His residues, which would be responsible for the high zinc affinity of factor C. The protein sample was reduced, alkylated and then in-gel digested with trypsin. The peptide fragments were then separated by capillary chromatography and identified by microelectrospray mass spectrometry. Peaks of higher intensity were sequenced by tandem mass spectrometry. The identified peptide fragments and the measured molecular mass of factor C protein also confirmed the original sequence of protein, as there was no shift in the open reading frame.
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Affiliation(s)
- P T Szabó
- Department of Medical Chemistry, Albert Szent-Györgyi Medical University, Dóm tér 8, H-6720 Szeged, Hungary.
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Birkó Z, Sümegi A, Vinnai A, van Wezel G, Szeszák F, Vitális S, Szabó PT, Kele Z, Janáky T, Biró S. Characterization of the gene for factor C, an extracellular signal protein involved in morphological differentiation of Streptomyces griseus. Microbiology (Reading) 1999; 145 ( Pt 9):2245-2253. [PMID: 10517577 DOI: 10.1099/00221287-145-9-2245] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The gene encoding factor C (facC), an extracellular signal protein involved in cellular differentiation, was cloned from Streptomyces griseus 45H, and the complete nucleotide sequence was determined. The deduced amino acid sequence was confirmed by HPLC/electrospray ionization-mass spectrometry analysis. The full-length protein consists of 324 amino acids and has a predicted molecular mass of 34,523 Da. The mature extracellular 286 amino acid protein (31,038 Da) is probably produced by cleaving off a 38 amino acid secretion signal sequence. Southern hybridization detected facC in several other Streptomyces strains, but database searches failed to identify a protein with significant homology to factor C. Expression of facC from a low-copy-number vector in S. griseus 52-1 resulted in a phenotypic effect similar to that given by exogenously added factor C protein.
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Affiliation(s)
- Zsuzsa Birkó
- Department of Human Genetics, University Medical School of Debrecen, H-4012 Debrecen Nagyerdei körút 98, Hungary1
| | - Andrea Sümegi
- Department of Human Genetics, University Medical School of Debrecen, H-4012 Debrecen Nagyerdei körút 98, Hungary1
| | - Andrea Vinnai
- Department of Human Genetics, University Medical School of Debrecen, H-4012 Debrecen Nagyerdei körút 98, Hungary1
| | - Gilles van Wezel
- Department of Biochemistry, Leiden University, Gorlaeus Laboratory, PO Box 9502, 2300 RA Leiden, The Netherlands3
| | - Ferenc Szeszák
- Department of Human Genetics, University Medical School of Debrecen, H-4012 Debrecen Nagyerdei körút 98, Hungary1
| | - Sándor Vitális
- Department of Human Genetics, University Medical School of Debrecen, H-4012 Debrecen Nagyerdei körút 98, Hungary1
| | - Pál T Szabó
- Department of Medicinal Chemistry, Albert Szent-Györgyi Medical University, H-6720 Szeged Dóm tér 8, Hungary2
| | - Zoltán Kele
- Department of Medicinal Chemistry, Albert Szent-Györgyi Medical University, H-6720 Szeged Dóm tér 8, Hungary2
| | - Tamás Janáky
- Department of Medicinal Chemistry, Albert Szent-Györgyi Medical University, H-6720 Szeged Dóm tér 8, Hungary2
| | - Sándor Biró
- Department of Human Genetics, University Medical School of Debrecen, H-4012 Debrecen Nagyerdei körút 98, Hungary1
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Kele Z, Janáky T, Mészáros T, Fehér A, Dudits D, Szabó PT. Capillary chromatography/microelectrospray mass spectrometry used for the identification of putative cyclin-dependent kinase inhibitory protein in Medicago. Rapid Commun Mass Spectrom 1998; 12:1564-1568. [PMID: 9796538 DOI: 10.1002/(sici)1097-0231(19981030)12:20<1564::aid-rcm351>3.0.co;2-t] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
A home-built capillary chromatography/microelectrospray system was used for peptide mass mapping of a putative cyclin-dependent kinase inhibitor protein with molecular mass of 8.5 kDa. The masses of identified tryptic fragments were then input to a protein database search routine. Daughter ion scans were done only on the most abundant tryptic fragments. On the basis of protein database search results and tandem mass spectrometric measurements the bioactive protein was identified as ubiquitin.
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Affiliation(s)
- Z Kele
- Department of Medical Chemistry, Albert Szent-Györgyi Medical University, Hungary
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