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Trojan M, Kučnirová K, Bouzková Š, Cvačka J, Čejka J, Tavčar G, Rybáčková M, Kvíčala J. Quaternary ammonium fluorides and difluorosilicates as nucleophilic fluorination reagents. Org Biomol Chem 2024; 22:1047-1056. [PMID: 38197465 DOI: 10.1039/d3ob01875j] [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: 01/11/2024]
Abstract
TBAT (tetrabutylammonium difluorotriphenylsilicate) is an excellent homogeneous nucleophilic fluorination reagent, but a high excess of the reagent was reported to be essential. We hence optimized the reaction conditions and compared its nucleophilic fluorination reactivity with that of other common commercial nucleophilic fluorination reagents, such as anhydrous TBAF and TASF (tris(dimethylamino)sulfonium difluorotrimethylsilicate). As the substrates, we employed a standard set of primary and secondary octyl substrates under identical conditions. To eliminate the possibility of hydrogen fluoride elimination in the above reagents, we prepared four quaternary ammonium fluorides lacking β-elimination possibility in the hydrocarbon chain, transformed them to the corresponding difluorotriphenylsilicates, and compared their reactivity with that of the commercial reagents. Furthermore, attempts to isolate analogous tetrabutylammonium difluoromethyldiphenylsilicate or difluorodimethylphenylsilicate failed, as was confirmed by comparison of the published experimental data with computed 19F NMR spectra. Finally, we studied the transition states of decomposition of various tetramethylammonium methylphenyldifluorosilicates by DFT methods and found that their relative energies increase with an increasing number of phenyl groups. The formation of difluorosilicates is a nearly barrierless process.
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Affiliation(s)
- Michal Trojan
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic.
| | - Kateřina Kučnirová
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic.
| | - Šárka Bouzková
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic.
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 542/2, 160 00 Prague 6, Czech Republic
| | - Jan Čejka
- Department of Solid State Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic
| | - Gašper Tavčar
- Department of Inorganic Chemistry and Technology, "Jožef Stefan" Institute, Jamova cesta 39, Ljubljana, Slovenia
| | - Markéta Rybáčková
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic.
| | - Jaroslav Kvíčala
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic.
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Lončarić D, Movahedifar F, Štoček JR, Dračínský M, Cvačka J, Guan S, Bythell BJ, Císařová I, Masson E, Kaleta J. Solvent-controlled formation of alkali and alkali-earth-secured cucurbituril/guest trimers. Chem Sci 2023; 14:9258-9266. [PMID: 37712024 PMCID: PMC10498720 DOI: 10.1039/d3sc02032k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 08/08/2023] [Indexed: 09/16/2023] Open
Abstract
Cucurbit[7]uril (CB[7]) encapsulates adamantyl and trimethylsilyl substituents of positively charged guests in dimethyl sulfoxide (DMSO). Unlike in water or deuterium oxide, addition of a selection of alkali and alkali-earth cations with van der Waals radii between 1.0 and 1.4 Å (Na+, K+, Ca2+, Sr2+, Ba2+ and Eu3+) to the CB[7]/guest complexes triggers their cation-mediated trimerization, a process that is very slow on the nuclear magnetic resonance (NMR) time scale. Smaller (Li+, Mg2+) or larger cations (Rb+, Cs+ or NH4+) are inert. The trimers display extensive CH-O interactions between the equatorial and pseudo-equatorial hydrogens of CB[7] and the carbonyl rim of the neighboring CB[7] unit in the trimer, and a deeply nested cation between the three interacting carbonylated CB[7] rims; a counteranion is likely perched in the shallow cavity formed by the three outer walls of CB[7] in the trimer. Remarkably, a guest must occupy the cavity of CB[7] for trimerization to take place. Using a combination of semi-empirical and density functional theory techniques in conjunction with continuum solvation models, we showed that trimerization is favored in DMSO, and not in water, because the penalty for the partial desolvation of three of the six CB[7] portals upon aggregation into a trimer is less unfavorable in DMSO compared to water.
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Affiliation(s)
- Doroteja Lončarić
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo nám. 2 160 00 Prague 6 Czech Republic
- Department of Organic Chemistry, Faculty of Science, Charles University in Prague 128 40 Prague 2 Czech Republic
| | - Fahimeh Movahedifar
- Department of Chemistry and Biochemistry, Ohio University Athens Ohio 45701 USA
| | - Jakub Radek Štoček
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo nám. 2 160 00 Prague 6 Czech Republic
- Department of Organic Chemistry, Faculty of Science, Charles University in Prague 128 40 Prague 2 Czech Republic
| | - Martin Dračínský
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo nám. 2 160 00 Prague 6 Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo nám. 2 160 00 Prague 6 Czech Republic
| | - Shanshan Guan
- Department of Chemistry and Biochemistry, Ohio University Athens Ohio 45701 USA
| | - Benjamin J Bythell
- Department of Chemistry and Biochemistry, Ohio University Athens Ohio 45701 USA
| | - Ivana Císařová
- Department of Inorganic Chemistry, Faculty of Science, Charles University in Prague 128 40 Prague 2 Czech Republic
| | - Eric Masson
- Department of Chemistry and Biochemistry, Ohio University Athens Ohio 45701 USA
| | - Jiří Kaleta
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo nám. 2 160 00 Prague 6 Czech Republic
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Vlachová M, Tran VN, Červený J, Dolníček F, Petrásková L, Pelantová H, Kundrát O, Cvačka J, Bosáková Z, Křen V, Lhoták P, Viktorová J, Bojarová P. Galectin-targeting glycocalix[4]arenes can enter the cells. Chem Commun (Camb) 2023; 59:10404-10407. [PMID: 37551910 DOI: 10.1039/d3cc02905k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 08/09/2023]
Abstract
Elevated levels of galectin-3 are associated with tumorigenesis. Its inhibition with high-affinity carbohydrate ligands opens new therapeutic routes. Targeting of intracellular galectin-3 is challenging for polar inhibitors like carbohydrates. We demonstrate the potential of novel biomedical research tools, glycocalix[4]arenes, to enter epithelial cells, which may allow their interaction with galectin-3.
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Affiliation(s)
- Miluše Vlachová
- Laboratory of Biotransformation, Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220, Praha 4, Czech Republic.
| | - Van Nguyen Tran
- University of Chemistry and Technology Prague, Technická 5, CZ-16628 Praha 6, Czech Republic.
| | - Jakub Červený
- Laboratory of Biotransformation, Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220, Praha 4, Czech Republic.
- Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, CZ-12843 Praha 2, Czech Republic
| | - František Dolníček
- University of Chemistry and Technology Prague, Technická 5, CZ-16628 Praha 6, Czech Republic.
| | - Lucie Petrásková
- Laboratory of Biotransformation, Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220, Praha 4, Czech Republic.
| | - Helena Pelantová
- Laboratory of Biotransformation, Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220, Praha 4, Czech Republic.
| | - Ondřej Kundrát
- University of Chemistry and Technology Prague, Technická 5, CZ-16628 Praha 6, Czech Republic.
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-16610 Praha 6, Czech Republic
| | - Zuzana Bosáková
- Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, CZ-12843 Praha 2, Czech Republic
| | - Vladimír Křen
- Laboratory of Biotransformation, Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220, Praha 4, Czech Republic.
| | - Pavel Lhoták
- University of Chemistry and Technology Prague, Technická 5, CZ-16628 Praha 6, Czech Republic.
| | - Jitka Viktorová
- University of Chemistry and Technology Prague, Technická 5, CZ-16628 Praha 6, Czech Republic.
| | - Pavla Bojarová
- Laboratory of Biotransformation, Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220, Praha 4, Czech Republic.
- Department of Health Care Disciplines and Population Protection, Faculty of Biomedical Engineering, Czech Technical University in Prague, nám. Sítná 3105, CZ-27201 Kladno, Czech Republic
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Zima V, Vlk M, Wan J, Cvačka J, Tureček F. Tracking Isomerizations of High-Energy Adenine Cation Radicals by UV-Vis Action Spectroscopy and Cyclic Ion Mobility Mass Spectrometry. J Phys Chem A 2023. [PMID: 37433135 DOI: 10.1021/acs.jpca.3c03179] [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: 07/13/2023]
Abstract
We report experimental and computational studies of protonated adenine C-8 σ-radicals that are presumed yet elusive reactive intermediates of oxidative damage to nucleic acids. The radicals were generated in the gas phase by the collision-induced dissociation of C-8-Br and C-8-I bonds in protonated 8-bromo- and 8-iodoadenine as well as by 8-bromo- and 8-iodo-9-methyladenine. Protonation by electrospray of 8-bromo- and 8-iodoadenine was shown by cyclic-ion mobility mass spectrometry (c-IMS) to form the N-1-H, N-9-H and N-3-H, N-7-H protomers in 85:15 and 81:19 ratios, respectively, in accordance with the equilibrium populations of these protomers in water-solvated ions that were calculated by density functional theory (DFT). Protonation of 8-halogenated 9-methyladenines yielded single N-1-H protomers, which was consistent with their thermodynamic stability. The radicals produced from the 8-bromo and 8-iodo adenine cations were characterized by UV-vis photodissociation action spectroscopy (UVPD) and c-IMS. UVPD revealed the formation of C-8 σ-radicals along with N-3-H, N-7-H-adenine π-radicals that arose as secondary products by hydrogen atom migrations. The isomers were identified by matching their action spectra against the calculated vibronic absorption spectra. Deuterium isotope effects were found to slow the isomerization and increase the population of C-8 σ-radicals. The adenine cation radicals were separated by c-IMS and identified by their collision cross sections, which were measured relative to the canonical N-9-H adenine cation radical that was cogenerated in situ as an internal standard. Ab initio CCSD(T)/CBS calculations of isomer energies showed that the adenine C-8 σ-radicals were local energy minima with relative energies at 76-79 kJ mol-1 above that of the canonical adenine cation radical. Rice-Ramsperger-Kassel-Marcus calculations of unimolecular rate constants for hydrogen and deuterium migrations resulting in exergonic isomerizations showed kinetic shifts of 10-17 kJ mol-1, stabilizing the C-8 σ-radicals. C-8 σ-radicals derived from N-1-protonated 9-methyladenine were also thermodynamically unstable and readily isomerized upon formation.
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Affiliation(s)
- Václav Zima
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Mikuláš Vlk
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, 16610 Prague 6, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University, 12800 Prague, Czech Republic
| | - Jiahao Wan
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, 16610 Prague 6, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University, 12800 Prague, Czech Republic
| | - František Tureček
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
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Menzel JP, Young RSE, Benfield AH, Scott JS, Wongsomboon P, Cudlman L, Cvačka J, Butler LM, Henriques ST, Poad BLJ, Blanksby SJ. Ozone-enabled fatty acid discovery reveals unexpected diversity in the human lipidome. Nat Commun 2023; 14:3940. [PMID: 37402773 DOI: 10.1038/s41467-023-39617-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 06/15/2023] [Indexed: 07/06/2023] Open
Abstract
Fatty acid isomers are responsible for an under-reported lipidome diversity across all kingdoms of life. Isomers of unsaturated fatty acids are often masked in contemporary analysis by incomplete separation and the absence of sufficiently diagnostic methods for structure elucidation. Here, we introduce a comprehensive workflow, to discover unsaturated fatty acids through coupling liquid chromatography and mass spectrometry with gas-phase ozonolysis of double bonds. The workflow encompasses semi-automated data analysis and enables de novo identification in complex media including human plasma, cancer cell lines and vernix caseosa. The targeted analysis including ozonolysis enables structural assignment over a dynamic range of five orders of magnitude, even in instances of incomplete chromatographic separation. Thereby we expand the number of identified plasma fatty acids two-fold, including non-methylene-interrupted fatty acids. Detection, without prior knowledge, allows discovery of non-canonical double bond positions. Changes in relative isomer abundances reflect underlying perturbations in lipid metabolism.
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Affiliation(s)
- Jan Philipp Menzel
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD, 4000, Australia
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD, 4000, Australia
- Centre for Data Science, Queensland University of Technology, Brisbane, QLD, 4000, Australia
- Institute of Clinical Chemistry, Inselspital, Bern University Hospital, 3010, Bern, Switzerland
| | - Reuben S E Young
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD, 4000, Australia
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD, 4000, Australia
- Faculty of Science, Medicine and Health, School of Chemistry and Molecular Bioscience, Wollongong, NSW, Australia
| | - Aurélie H Benfield
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Translational Research Institute, Brisbane, QLD, 4102, Australia
| | - Julia S Scott
- South Australian Immunogenomics Cancer Institute and Freemasons Centre for Male Health and Wellbeing, University of Adelaide, Adelaide, SA, Australia
- South Australian Health and Medical Research Institute, Adelaide, SA, Australia
| | - Puttandon Wongsomboon
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD, 4000, Australia
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD, 4000, Australia
| | - Lukáš Cudlman
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 542/2, 16600, Prague, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University, Prague 2, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 542/2, 16600, Prague, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University, Prague 2, Czech Republic
| | - Lisa M Butler
- South Australian Immunogenomics Cancer Institute and Freemasons Centre for Male Health and Wellbeing, University of Adelaide, Adelaide, SA, Australia
- South Australian Health and Medical Research Institute, Adelaide, SA, Australia
| | - Sónia T Henriques
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Translational Research Institute, Brisbane, QLD, 4102, Australia
| | - Berwyck L J Poad
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD, 4000, Australia
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD, 4000, Australia
| | - Stephen J Blanksby
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD, 4000, Australia.
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD, 4000, Australia.
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Vrkoslav V, Horká P, Jindřich J, Buděšínský M, Cvačka J. Silver Ion High-Performance Liquid Chromatography-Atmospheric Pressure Chemical Ionization Mass Spectrometry: A Tool for Analyzing Cuticular Hydrocarbons. Molecules 2023; 28:molecules28093794. [PMID: 37175204 PMCID: PMC10179885 DOI: 10.3390/molecules28093794] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 04/17/2023] [Accepted: 04/25/2023] [Indexed: 05/15/2023] Open
Abstract
Aliphatic hydrocarbons (HCs) are usually analyzed by gas chromatography (GC) or matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. However, analyzing long-chain HCs by GC is difficult because of their low volatility and the risk of decomposition at high temperatures. MALDI cannot distinguish between isomeric HCs. An alternative approach based on silver ion high-performance liquid chromatography (Ag-HPLC) is shown here. The separation of HC standards and cuticular HCs was accomplished using two ChromSpher Lipids columns connected in series. A gradient elution of the analytes was optimized using mobile phases prepared from hexane (or isooctane) and acetonitrile, 2-propanol, or toluene. HCs were detected by atmospheric pressure chemical ionization mass spectrometry (APCI-MS). Good separation of the analytes according to the number of double bonds, cis/trans geometry, and position of double bonds was achieved. The retention times increased with the number of double bonds, and trans isomers eluted ahead of cis isomers. The mobile phase significantly affected the mass spectra of HCs. Depending on the mobile phase composition, deprotonated molecules, molecular ions, protonated molecules, and various solvent-related adducts of HCs were observed. The optimized Ag-HPLC/APCI-MS was applied for characterizing cuticular HCs from a flesh fly, Neobellieria bullata, and cockroach, Periplaneta americana. The method made it possible to detect a significantly higher number of HCs than previously reported for GC or MALDI-MS. Unsaturated HCs were frequently detected as isomers differing by double-bond position(s). Minor HCs with trans double bonds were found beside the prevailing cis isomers. Ag-HPLC/APCI-MS has great potential to become a new tool in chemical ecology for studying cuticular HCs.
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Affiliation(s)
- Vladimír Vrkoslav
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 160 00 Prague, Czech Republic
| | - Petra Horká
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 160 00 Prague, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 00 Prague, Czech Republic
| | - Jindřich Jindřich
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 00 Prague, Czech Republic
| | - Miloš Buděšínský
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 160 00 Prague, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 160 00 Prague, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 00 Prague, Czech Republic
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Sedláčková S, Hubálek M, Vrkoslav V, Blechová M, Kozlík P, Cvačka J. Positive Effect of Acetylation on Proteomic Analysis Based on Liquid Chromatography with Atmospheric Pressure Chemical Ionization and Photoionization Mass Spectrometry. Molecules 2023; 28:molecules28093711. [PMID: 37175121 PMCID: PMC10180487 DOI: 10.3390/molecules28093711] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 04/14/2023] [Accepted: 04/21/2023] [Indexed: 05/15/2023] Open
Abstract
A typical bottom-up proteomic workflow comprises sample digestion with trypsin, separation of the hydrolysate using reversed-phase HPLC, and detection of peptides via electrospray ionization (ESI) tandem mass spectrometry. Despite the advantages and wide usage of protein identification and quantification, the procedure has limitations. Some domains or parts of the proteins may remain inadequately described due to inefficient detection of certain peptides. This study presents an alternative approach based on sample acetylation and mass spectrometry with atmospheric pressure chemical ionization (APCI) and atmospheric pressure photoionization (APPI). These ionizations allowed for improved detection of acetylated peptides obtained via chymotrypsin or glutamyl peptidase I (Glu-C) digestion. APCI and APPI spectra of acetylated peptides often provided sequence information already at the full scan level, while fragmentation spectra of protonated molecules and sodium adducts were easy to interpret. As demonstrated for bovine serum albumin, acetylation improved proteomic analysis. Compared to ESI, gas-phase ionizations APCI and APPI made it possible to detect more peptides and provide better sequence coverages in most cases. Importantly, APCI and APPI detected many peptides which passed unnoticed in the ESI source. Therefore, analytical methods based on chymotrypsin or Glu-C digestion, acetylation, and APPI or APCI provide data complementary to classical bottom-up proteomics.
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Affiliation(s)
- Simona Sedláčková
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 16000 Prague, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 12800 Prague, Czech Republic
| | - Martin Hubálek
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 16000 Prague, Czech Republic
| | - Vladimír Vrkoslav
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 16000 Prague, Czech Republic
| | - Miroslava Blechová
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 16000 Prague, Czech Republic
| | - Petr Kozlík
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 12800 Prague, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 16000 Prague, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 12800 Prague, Czech Republic
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Kučnirová K, Kvíčala J, Svoboda M, Cvačka J, Čejka J, Rybáčková M. Non-symmetrical Tetrafluoroalkadienes Synthesized by ROCM of 3,3,4,4-Tetrafluorocyclobutene. Chemistry 2023:e202300435. [PMID: 37026531 DOI: 10.1002/chem.202300435] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 04/03/2023] [Accepted: 04/04/2023] [Indexed: 04/08/2023]
Abstract
As the first known example of ring-opening cross metathesis (ROCM) of polyfluorinated strained cyclobutenes, ROCM of 3,3,4,4-tetrafluorocyclobutene with electronically rich alkenes, catalyzed by Grubbs or Hoveyda-Grubbs 2nd generation precatalysts, gave a small library of non-symmetrical isolated dienes bearing a tetrafluoroethylene spacer between the double bonds. 1-Butoxy-3,3,4,4-tetrafluorohexa-1,5-diene thus formed underwent subsequent regioselective cross metathesis (CM) with a series of styrenes, catalyzed by Hoveyda-Grubbs 2nd generation precatalyst, leading to non-symmetrically substituted dienes. 6,6-Dibutoxy-3,3,4,4-tetrafluorohex-1-ene, formed by regioselective butoxylation of 1-butoxy-3,3,4,4-tetrafluorohexa-1,5-diene, was dihydroxylated and cyclized to the corresponding 3,3,4,4-tetrafluorohexopyranose.
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Affiliation(s)
- Kateřina Kučnirová
- University of Chemistry and Technology Prague: Vysoka skola chemicko-technologicka v Praze, Department of Organic Chemistry, CZECH REPUBLIC
| | - Jaroslav Kvíčala
- University of Chemistry and Technology Prague: Vysoka skola chemicko-technologicka v Praze, Department of Organic Chemistry, CZECH REPUBLIC
| | - Martin Svoboda
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences: Ustav organicke chemie a biochemie Akademie ved Ceske republiky, Mass spectrometry, CZECH REPUBLIC
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences: Ustav organicke chemie a biochemie Akademie ved Ceske republiky, Mass spectrometry, CZECH REPUBLIC
| | - Jan Čejka
- University of Chemistry and Technology Prague: Vysoka skola chemicko-technologicka v Praze, Department of Solid State Chemistry, CZECH REPUBLIC
| | - Markéta Rybáčková
- University of Chemistry and Technology Prague: Vysoka skola chemicko-technologicka v Praze, Department of Organic Chemistry, Technická 5, 166 28, Prague, CZECH REPUBLIC
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9
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Kloudová B, Strmeň T, Vrkoslav V, Chára Z, Pačes O, Cvačka J. Gas Dynamic Virtual Nozzle Sprayer for an Introduction of Liquid Samples in Atmospheric Pressure Ionization Mass Spectrometry. Anal Chem 2023; 95:4196-4203. [PMID: 36800482 PMCID: PMC10016749 DOI: 10.1021/acs.analchem.2c05349] [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: 02/19/2023]
Abstract
Electrospray may exhibit inadequate ionization efficiency in some applications. In such cases, atmospheric-pressure chemical ionization (APCI) and photoionization (APPI) can be used. Despite a wide application potential, no APCI and APPI sources dedicated to very low sample flow rates exist on the market. Since the ion source performance depends on the transfer of analytes from the liquid to the gas phase, a nebulizer is a critical component of an ion source. Here, we report on the nebulizer with a gas dynamic virtual nozzle (GDVN) and its applicability in APCI at microliter-per-minute flow rates. Nebulizers differing by geometrical parameters were fabricated and characterized regarding the jet breakup regime, droplet size, droplet velocity, and spray angle for liquid flow rates of 0.75-15.0 μL/min. A micro-APCI source with the GDVN nebulizer behaved as a mass-flow-sensitive detector and provided stable and intense analyte signals. Compared to a classical APCI source, an order of magnitude lower detection limit for verapamil was achieved. Mass spectra recorded with the nebulizer in dripping and jetting modes were almost identical and did not differ from normal APCI spectra. Clogging never occurred during the experiments, indicating the high robustness of the nebulizer. Low-flow-rate APCI and APPI sources with a GDVN sprayer promise new applications for low- and medium-polar analytes.
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Affiliation(s)
- Barbora Kloudová
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-166 10 Prague 6, Czech Republic.,Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030/8, CZ-128 43 Prague 2, Czech Republic
| | - Timotej Strmeň
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-166 10 Prague 6, Czech Republic
| | - Vladimír Vrkoslav
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-166 10 Prague 6, Czech Republic
| | - Zdeněk Chára
- Institute of Hydrodynamics of the Czech Academy of Sciences, Pod Pat'ankou 30/5, CZ-166 12 Prague 6, Czech Republic
| | - Ondřej Pačes
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-166 10 Prague 6, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-166 10 Prague 6, Czech Republic.,Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030/8, CZ-128 43 Prague 2, Czech Republic
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10
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Konvalinková D, Dolníček F, Hovorková M, Červený J, Kundrát O, Pelantová H, Petrásková L, Cvačka J, Faizulina M, Varghese B, Kovaříček P, Křen V, Lhoták P, Bojarová P. Glycocalix[4]arenes and their affinity to a library of galectins: the linker matters. Org Biomol Chem 2023; 21:1294-1302. [PMID: 36647793 DOI: 10.1039/d2ob02235d] [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: 01/11/2023]
Abstract
Galectins are lectins that bind β-galactosides. They are involved in important extra- and intracellular biological processes such as apoptosis, and regulation of the immune system or the cell cycle. High-affinity ligands of galectins may introduce new therapeutic approaches or become new tools for biomedical research. One way of increasing the low affinity of β-galactoside ligands to galectins is their multivalent presentation, e.g., using calixarenes. We report on the synthesis of glycocalix[4]arenes in cone, partial cone, 1,2-alternate, and 1,3-alternate conformations carrying a lactosyl ligand on three different linkers. The affinity of the prepared compounds to a library of human galectins was determined using competitive ELISA assay and biolayer interferometry. Structure-affinity relationships regarding the influence of the linker and the core structure were formulated. Substantial differences were found between various linker lengths and the position of the triazole unit. The formation of supramolecular clusters was detected by atomic force microscopy. The present work gives a systematic insight into prospective galectin ligands based on the calix[4]arene core.
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Affiliation(s)
- Dorota Konvalinková
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague 4, Czech Republic.
| | - František Dolníček
- Department of Organic Chemistry, University of Chemistry and Technology Prague, Technická 5, CZ-16628 Praha 6, Czech Republic.
| | - Michaela Hovorková
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague 4, Czech Republic. .,Department of Genetics and Microbiology, Faculty of Science, Charles University, Viničná 5, CZ-12843 Prague 2, Czech Republic
| | - Jakub Červený
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague 4, Czech Republic. .,Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 8, CZ-12843 Prague 2, Czech Republic
| | - Ondřej Kundrát
- Department of Organic Chemistry, University of Chemistry and Technology Prague, Technická 5, CZ-16628 Praha 6, Czech Republic.
| | - Helena Pelantová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague 4, Czech Republic.
| | - Lucie Petrásková
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague 4, Czech Republic.
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-166 10 Prague 6, Czech Republic
| | - Margarita Faizulina
- Department of Organic Chemistry, University of Chemistry and Technology Prague, Technická 5, CZ-16628 Praha 6, Czech Republic.
| | - Beena Varghese
- Department of Organic Chemistry, University of Chemistry and Technology Prague, Technická 5, CZ-16628 Praha 6, Czech Republic.
| | - Petr Kovaříček
- Department of Organic Chemistry, University of Chemistry and Technology Prague, Technická 5, CZ-16628 Praha 6, Czech Republic.
| | - Vladimír Křen
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague 4, Czech Republic.
| | - Pavel Lhoták
- Department of Organic Chemistry, University of Chemistry and Technology Prague, Technická 5, CZ-16628 Praha 6, Czech Republic.
| | - Pavla Bojarová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague 4, Czech Republic. .,Department of Health Care Disciplines and Population Protection, Faculty of Biomedical Engineering, Czech Technical University in Prague, nám. Sítná 3105, CZ-272 01 Kladno, Czech Republic
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11
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Hovorková M, Červený J, Bumba L, Pelantová H, Cvačka J, Křen V, Renaudet O, Goyard D, Bojarová P. Advanced high-affinity glycoconjugate ligands of galectins. Bioorg Chem 2023; 131:106279. [PMID: 36446202 DOI: 10.1016/j.bioorg.2022.106279] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 11/04/2022] [Accepted: 11/12/2022] [Indexed: 11/20/2022]
Abstract
Galectins are proteins of the family of human lectins. By binding terminal galactose units of cell surface glycans, they moderate biological and pathological processes such as cell signaling, cell adhesion, apoptosis, fibrosis, carcinogenesis, and metabolic disorders. The binding of monovalent glycans to galectins is usually relatively weak. Therefore, the presentation of carbohydrate ligands on multivalent scaffolds can efficiently increase and/or discriminate the affinity of the glycoconjugate to different galectins. A library of glycoclusters and glycodendrimers with various structural presentations of the common functionalized N-acetyllactosamine ligand was prepared to evaluate how the mode of presentation affects the affinity and selectivity to the two most abundant galectins, galectin-1 (Gal-1) and galectin-3 (Gal-3). In addition, the effect of a one- to two-unit carbohydrate spacer on the affinity of the glycoconjugates was determined. A new design of the biolayer interferometry (BLI) method with specific AVI-tagged constructs was used to determine the affinity to galectins, and compared with the gold-standard method of isothermal titration calorimetry (ITC). This study reveals new routes to low nanomolar glycoconjugate inhibitors of galectins of interest for biomedical research.
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Affiliation(s)
- Michaela Hovorková
- Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague 4, Czech Republic; Department of Genetics and Microbiology, Faculty of Science, Charles University, Viničná 5, CZ-12843 Prague 2, Czech Republic
| | - Jakub Červený
- Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague 4, Czech Republic; Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 8, CZ-12843 Prague 2, Czech Republic
| | - Ladislav Bumba
- Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague 4, Czech Republic
| | - Helena Pelantová
- Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague 4, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám, 2, CZ-166 10 Prague 6, Czech Republic
| | - Vladimír Křen
- Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague 4, Czech Republic
| | - Olivier Renaudet
- Department of Molecular Chemistry, University Grenoble-Alpes, 621, Avenue Centrale, F-38400 Saint Martin-d'Hères, France
| | - David Goyard
- Department of Molecular Chemistry, University Grenoble-Alpes, 621, Avenue Centrale, F-38400 Saint Martin-d'Hères, France.
| | - Pavla Bojarová
- Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague 4, Czech Republic; Department of Health Care Disciplines and Population Protection, Faculty of Biomedical Engineering, Czech Technical University in Prague, nám. Sítná 3105, CZ-272 01 Kladno, Czech Republic.
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12
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Sillam-Dussès D, Jandák V, Stiblik P, Delattre O, Chouvenc T, Balvín O, Cvačka J, Soulet D, Synek J, Brothánek M, Jiříček O, Engel MS, Bourguignon T, Šobotník J. Alarm communication predates eusociality in termites. Commun Biol 2023; 6:83. [PMID: 36681783 PMCID: PMC9867704 DOI: 10.1038/s42003-023-04438-5] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 01/06/2023] [Indexed: 01/22/2023] Open
Abstract
Termites (Blattodea: Isoptera) have evolved specialized defensive strategies for colony protection. Alarm communication enables workers to escape threats while soldiers are recruited to the source of disturbance. Here, we study the vibroacoustic and chemical alarm communication in the wood roach Cryptocercus and in 20 termite species including seven of the nine termite families, all life-types, and all feeding and nesting habits. Our multidisciplinary approach shows that vibratory alarm signals represent an ethological synapomorphy of termites and Cryptocercus. In contrast, chemical alarms have evolved independently in several cockroach groups and at least twice in termites. Vibroacoustic alarm signaling patterns are the most complex in Neoisoptera, in which they are often combined with chemical signals. The alarm characters correlate to phylogenetic position, food type and hardness, foraging area size, and nesting habits. Overall, species of Neoisoptera have developed the most sophisticated communication system amongst termites, potentially contributing to their ecological success.
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Affiliation(s)
- David Sillam-Dussès
- University Sorbonne Paris Nord, Laboratory of Experimental and Comparative Ethology UR4443, 93430, Villetaneuse, France
| | - Vojtěch Jandák
- Czech Technical University in Prague, Faculty of Electrical Engineering, 166 27, Prague 6, Czech Republic
| | - Petr Stiblik
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, 165 21, Prague 6 - Suchdol, Czech Republic
| | - Olivier Delattre
- University Sorbonne Paris Nord, Laboratory of Experimental and Comparative Ethology UR4443, 93430, Villetaneuse, France
| | - Thomas Chouvenc
- Entomology and Nematology Department, Fort Lauderdale Research and Education Center, University of Florida, Institute of Food and Agricultural Sciences, Fort Lauderdale, Florida, 33314, USA
| | - Ondřej Balvín
- Faculty of Environmental Sciences, Czech University of Life Sciences Prague, 165 21, Prague 6 - Suchdol, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, 166 10, Prague, Czech Republic
| | - Delphine Soulet
- University Sorbonne Paris Nord, Laboratory of Experimental and Comparative Ethology UR4443, 93430, Villetaneuse, France
| | - Jiří Synek
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, 165 21, Prague 6 - Suchdol, Czech Republic
| | - Marek Brothánek
- Czech Technical University in Prague, Faculty of Electrical Engineering, 166 27, Prague 6, Czech Republic
| | - Ondřej Jiříček
- Czech Technical University in Prague, Faculty of Electrical Engineering, 166 27, Prague 6, Czech Republic
| | - Michael S Engel
- Division of Entomology, Natural History Museum, and Department of Ecology & Evolutionary Biology, 1501 Crestline Drive-Suite 140, University of Kansas, Lawrence, Kansas, 66045, USA.
| | - Thomas Bourguignon
- Faculty of Tropical AgriSciences, Czech University of Life Sciences Prague, 165 21, Prague 6 - Suchdol, Czech Republic
- Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
| | - Jan Šobotník
- Faculty of Tropical AgriSciences, Czech University of Life Sciences Prague, 165 21, Prague 6 - Suchdol, Czech Republic.
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13
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Strnad Š, Strnadová V, Sýkora D, Cvačka J, Maletínská L, Vrkoslav V. MALDI Mass Spectrometry Imaging of Lipids on Free-Floating Brain Sections and Immunohistochemically Colocalized Markers of Neurodegeneration. Methods Mol Biol 2022; 2437:229-239. [PMID: 34902152 DOI: 10.1007/978-1-0716-2030-4_16] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In mass spectrometry imaging (MSI), the essential steps in sample preparation include collection and storage. The most widely used preservation procedure for MSI consists in freezing samples and storing them at temperatures below -80 °C. On the other hand, the most common method for preserving biological samples in clinical practice is their fixation in paraformaldehyde. The storage of free-floating sections is a particular type of the preservation of paraformaldehyde-fixed tissues that is used in immunohistochemistry. This chapter describes the approach of the multimodal imaging of free-floating brain sections using the MSI of lipids and the immunohistochemistry of neurodegeneration markers.
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Affiliation(s)
- Štěpán Strnad
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic
| | - Veronika Strnadová
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic
| | - David Sýkora
- University of Chemistry and Technology Prague, Prague, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic
| | - Lenka Maletínská
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic
| | - Vladimír Vrkoslav
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic.
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14
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Bould J, Londesborough MGS, Passarelli V, Clegg W, Waddell PG, Cvačka J, Macías R. A simple and high-yield route to iridium, rhodium, osmium and ruthenium nido-6-metalladecaborane compounds. Dalton Trans 2021; 50:16751-16764. [PMID: 34762089 DOI: 10.1039/d1dt02971a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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
We report a high-yield heterogeneous solid/liquid phase synthetic method to a series of nido-6-metalladecaboranes. The hydridoirida- and hydridorhoda-decaboranes, [6,6,6-H(PPh3)2-nido-6-MB9H13] [M = Ir (1), Rh (2)] are isolatable in 98% yields from the reaction of the square-planar M(I) complexes, [MCl(PPh3)3] (M = Rh, Ir), with K[B9H14]. The same synthetic procedure, but using [MCl(CO)H(PPh3)3] (M = Ru, Os) as metal starting reagents produces the CO-ligated clusters, [6,6,6-(CO)(PPh3)2-nido-6-MB9H13] [M = Ru (3), Os (4)], in yields of 83% and 95%, respectively. These highly convenient syntheses permit the investigation of the reaction chemistry of the new nido-6-metalladecaboranes. Thus, the CO-ligated compounds, 3 and 4, react with the square-planar platinum(II) complex, [PtCl2(PMe2Ph)2], in the presence of potassium triethylborohydride, to give the bimetallic clusters, [1,1,1-(CO)H(PPh3)-isocloso-1-RuB9H8-μ-(1,2)-{Pt(PMe2Ph)2}] (5) and [7,7-(PMe2Ph)2-9,9,9-(CO)(PPh3)2-nido-7,9-PtOsB9H11] (6), and the monometallic nido-5-osamadecaborane, [5,5,5-(PPh3)2(CO)-nido-5-OsB9H13] (7). This reactivity illustrates the potential of polyhedral boron-based clusters as molecular scaffolds ("B-frames") for the construction of multimetallic species. Single-crystal X-ray diffraction analyses have revealed the molecular structures of 3, 5, 6 and 7; the compounds are also studied by multielement NMR spectroscopy, mass spectrometry, IR spectroscopy, and in some cases computationally. Futhermore, the rotation of the {M(X)(PR3)2} moiety (X = H, CO), as PH3-ligated models, is studied by means of DFT-calculated relaxed potential energy surface scans, giving some insight into the lability of the metal-to-borane fragment interaction and of the exo-polyhedral ligands.
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Affiliation(s)
- Jonathan Bould
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, Husinec-Řež 250 68, Czech Republic. .,Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogenea (ISQCH), Universidad de Zaragoza-CSIC, C/Pedro Cerbuna 12, ES-50009 Zaragoza, Spain.
| | - Michael G S Londesborough
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, Husinec-Řež 250 68, Czech Republic.
| | - Vincenzo Passarelli
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogenea (ISQCH), Universidad de Zaragoza-CSIC, C/Pedro Cerbuna 12, ES-50009 Zaragoza, Spain.
| | - William Clegg
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Paul G Waddell
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-166 10 Prague 6, Czech Republic
| | - Ramón Macías
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogenea (ISQCH), Universidad de Zaragoza-CSIC, C/Pedro Cerbuna 12, ES-50009 Zaragoza, Spain.
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15
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Horká P, Vrkoslav V, Kindl J, Schwarzová-Pecková K, Cvačka J. Structural Characterization of Unusual Fatty Acid Methyl Esters with Double and Triple Bonds Using HPLC/APCI-MS 2 with Acetonitrile In-Source Derivatization. Molecules 2021; 26:molecules26216468. [PMID: 34770878 PMCID: PMC8588306 DOI: 10.3390/molecules26216468] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 10/21/2021] [Accepted: 10/21/2021] [Indexed: 12/11/2022] Open
Abstract
Double and triple bonds have significant effects on the biological activities of lipids. Determining multiple bond positions in their molecules by mass spectrometry usually requires chemical derivatization. This work presents an HPLC/MS method for pinpointing the double and triple bonds in fatty acids. Fatty acid methyl esters were separated by reversed-phase HPLC with an acetonitrile mobile phase. In the APCI source, acetonitrile formed reactive species, which added to double and triple bonds to form [M + C3H5N]+• ions. Their collisional activation in an ion trap provided fragments helpful in localizing the multiple bond positions. This approach was applied to fatty acids with isolated, cumulated, and conjugated double bonds and triple bonds. The fatty acids were isolated from the fat body of early-nesting bumblebee Bombus pratorum and seeds or seed oils of Punicum granatum, Marrubium vulgare, and Santalum album. Using the method, the presence of the known fatty acids was confirmed, and new ones were discovered.
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Affiliation(s)
- Petra Horká
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 166 00 Prague 6, Czech Republic; (P.H.); (V.V.); (J.K.)
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 43 Prague 2, Czech Republic;
| | - Vladimír Vrkoslav
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 166 00 Prague 6, Czech Republic; (P.H.); (V.V.); (J.K.)
| | - Jiří Kindl
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 166 00 Prague 6, Czech Republic; (P.H.); (V.V.); (J.K.)
| | - Karolina Schwarzová-Pecková
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 43 Prague 2, Czech Republic;
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 166 00 Prague 6, Czech Republic; (P.H.); (V.V.); (J.K.)
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 43 Prague 2, Czech Republic;
- Correspondence: ; Tel.: +420-220-183-303
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16
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Vrána J, Holub J, Samsonov MA, Růžičková Z, Cvačka J, McKee ML, Fanfrlík J, Hnyk D, Růžička A. Access to cationic polyhedral carboranes via dynamic cage surgery with N-heterocyclic carbenes. Nat Commun 2021; 12:4971. [PMID: 34404809 PMCID: PMC8371172 DOI: 10.1038/s41467-021-25277-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 08/02/2021] [Indexed: 12/03/2022] Open
Abstract
Polyhedral boranes and heteroboranes appear almost exclusively as neutral or anionic species, while the cationic ones are protonated at exoskeletal heteroatoms or they are instable. Here we report the reactivity of 10-vertex closo-dicarbadecaboranes with one or two equivalents of N-heterocyclic carbene to 10-vertex nido mono- and/or bis-carbene adducts, respectively. These complexes easily undergo a reaction with HCl to give cages of stable and water soluble 10-vertex nido-type cations with protonation in the form of a BHB bridge or 10-vertex closo-type cations containing one carbene ligand when originating from closo-1,10-dicarbadecaborane. The reaction of a 10-vertex nido mono-carbene adduct with phosphorus trichloride gives nido-11-vertex 2-phospha-7,8-dicarbaundecaborane, which undergoes an oxidation of the phosphorus atom to P = O, while the product of a bis-carbene adduct reaction is best described as a distorted C2B6H8 fragment bridged by the (BH)2PCl2+ moiety. In comparison to their neutral or anionic counterparts, examples of cationic boron clusters remain scarce. Here, the authors prepare a variety of cationic polyhedral boranes by reacting closo-10-vertex carboranes with N-heterocyclic carbenes; the resulting open-cage cationic nido- arachno- or closo- derivatives are water soluble, which may enable unprecedented applications.
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Affiliation(s)
- Jan Vrána
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Pardubice, Czech Republic
| | - Josef Holub
- Institute of Inorganic Chemistry, Czech Academy of Sciences, Řež, Czech Republic
| | - Maksim A Samsonov
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Pardubice, Czech Republic
| | - Zdeňka Růžičková
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Pardubice, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic
| | - Michael L McKee
- Department of Chemistry and Biochemistry, Auburn University, Auburn, AL, USA
| | - Jindřich Fanfrlík
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic
| | - Drahomír Hnyk
- Institute of Inorganic Chemistry, Czech Academy of Sciences, Řež, Czech Republic
| | - Aleš Růžička
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Pardubice, Czech Republic.
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17
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Smrček J, Hájek M, Hodek O, Čížek K, Pohl R, Jahn E, Galano JM, Oger C, Durand T, Cvačka J, Jahn U. First Total Synthesis of Phytoprostanes with Prostaglandin-Like Configuration, Evidence for Their Formation in Edible Vegetable Oils and Orienting Study of Their Biological Activity. Chemistry 2021; 27:9556-9562. [PMID: 33904184 DOI: 10.1002/chem.202100872] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Indexed: 11/09/2022]
Abstract
Phytoprostanes (PhytoP) are natural products, which form in plants under oxidative stress conditions from α-linolenic acid. However, their epimers with relative prostaglandin configuration termed phytoglandins (PhytoG) have never been detected in Nature, likely because of the lack of synthetic reference material. Here, the first asymmetric total synthesis of such compounds, namely of PhytoGF1α (9-epi-16-F1t -PhytoP) and its diastereomer ent-16-epi-PhytoGF1α (ent-9,16-diepi-16-F1t -PhytoP), has been accomplished. The synthetic strategy is based on radical anion oxidative cyclization, copper(I)-mediated alkyl-alkyl coupling and enantioselective reduction reactions. A UHPLC-MS/MS study using the synthesized compounds as standards indicates PhytoG formation at significant levels during autoxidation of α-linolenic acid in edible vegetable oils. Initial testing of synthetic PhytoGs together with F1 -PhytoP and 15-F2t -IsoP derivatives for potential interactions with the PGF2α (FP) receptor did not reveal significant activity. The notion that PUFA-derived oxidatively formed cyclic metabolites with prostaglandin configuration do not form to a significant extent in biological or food matrices has to be corrected. Strong evidence is provided that oxidatively formed PhytoG metabolites may be ingested with plant-derived food, which necessitates further investigation of their biological profile.
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Affiliation(s)
- Jakub Smrček
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo náměstí 2, 16610, Prague 6, Czech Republic
| | - Miroslav Hájek
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo náměstí 2, 16610, Prague 6, Czech Republic
| | - Ondřej Hodek
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo náměstí 2, 16610, Prague 6, Czech Republic
| | - Karel Čížek
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo náměstí 2, 16610, Prague 6, Czech Republic
| | - Radek Pohl
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo náměstí 2, 16610, Prague 6, Czech Republic
| | - Emanuela Jahn
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo náměstí 2, 16610, Prague 6, Czech Republic
| | - Jean-Marie Galano
- Institut des Biomolécules Max Mousseron IBMM, CNRS, ENSCM, Faculté de Pharmacie, Université de Montpellier, 15 Av. Charles Flahault, CS14491, 34093, Montpellier Cedex 05, France
| | - Camille Oger
- Institut des Biomolécules Max Mousseron IBMM, CNRS, ENSCM, Faculté de Pharmacie, Université de Montpellier, 15 Av. Charles Flahault, CS14491, 34093, Montpellier Cedex 05, France
| | - Thierry Durand
- Institut des Biomolécules Max Mousseron IBMM, CNRS, ENSCM, Faculté de Pharmacie, Université de Montpellier, 15 Av. Charles Flahault, CS14491, 34093, Montpellier Cedex 05, France
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo náměstí 2, 16610, Prague 6, Czech Republic
| | - Ullrich Jahn
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo náměstí 2, 16610, Prague 6, Czech Republic
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Smrček J, Hájek M, Hodek O, Čížek K, Pohl R, Jahn E, Galano J, Oger C, Durand T, Cvačka J, Jahn U. Cover Feature: First Total Synthesis of Phytoprostanes with Prostaglandin‐Like Configuration, Evidence for Their Formation in Edible Vegetable Oils and Orienting Study of Their Biological Activity (Chem. Eur. J. 37/2021). Chemistry 2021. [DOI: 10.1002/chem.202101937] [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: 11/06/2022]
Affiliation(s)
- Jakub Smrček
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague 6 Czech Republic
| | - Miroslav Hájek
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague 6 Czech Republic
| | - Ondřej Hodek
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague 6 Czech Republic
| | - Karel Čížek
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague 6 Czech Republic
| | - Radek Pohl
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague 6 Czech Republic
| | - Emanuela Jahn
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague 6 Czech Republic
| | - Jean‐Marie Galano
- Institut des Biomolécules Max Mousseron IBMM CNRS ENSCM Faculté de Pharmacie Université de Montpellier 15 Av. Charles Flahault CS14491, 34093 Montpellier Cedex 05 France
| | - Camille Oger
- Institut des Biomolécules Max Mousseron IBMM CNRS ENSCM Faculté de Pharmacie Université de Montpellier 15 Av. Charles Flahault CS14491, 34093 Montpellier Cedex 05 France
| | - Thierry Durand
- Institut des Biomolécules Max Mousseron IBMM CNRS ENSCM Faculté de Pharmacie Université de Montpellier 15 Av. Charles Flahault CS14491, 34093 Montpellier Cedex 05 France
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague 6 Czech Republic
| | - Ullrich Jahn
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague 6 Czech Republic
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Heine V, Hovorková M, Vlachová M, Filipová M, Bumba L, Janoušková O, Hubálek M, Cvačka J, Petrásková L, Pelantová H, Křen V, Elling L, Bojarová P. Immunoprotective neo-glycoproteins: Chemoenzymatic synthesis of multivalent glycomimetics for inhibition of cancer-related galectin-3. Eur J Med Chem 2021; 220:113500. [PMID: 33962190 DOI: 10.1016/j.ejmech.2021.113500] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [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: 02/19/2021] [Revised: 04/15/2021] [Accepted: 04/16/2021] [Indexed: 02/07/2023]
Abstract
Galectin-3 plays a crucial role in cancerogenesis; its targeting is a prospective pathway in cancer diagnostics and therapy. Multivalent presentation of glycans was shown to strongly increase the affinity of glycoconjugates to galectin-3. Further strengthening of interaction with galectin-3 may be accomplished using artificial glycomimetics with apt aryl substitutions. We established a new, as yet undescribed chemoenzymatic method to produce selective C-3-substituted N,N'-diacetyllactosamine glycomimetics and coupled them to human serum albumin. From a library of enzymes, only β-N-acetylhexosaminidase from Talaromyces flavus was able to efficiently synthesize the C-3-propargylated disaccharide. Various aryl residues were attached to the functionalized N,N'-diacetyllactosamine via click chemistry to assess the impact of the aromatic substitution. In ELISA-type assays with galectin-3, free glycomimetics exhibited up to 43-fold stronger inhibitory potency to Gal-3 than the lactose standard. Coupling to human serum albumin afforded multivalent neo-glycoproteins with up to 4209-fold increased inhibitory potency per glycan compared to the monovalent lactose standard. Surface plasmon resonance brought further information on the kinetics of galectin-3 inhibition. The potential of prepared neo-glycoproteins to target galectin-3 was demonstrated on colorectal adenocarcinoma DLD-1 cells. We investigated the uptake of neo-glycoproteins into cells and observed limited non-specific transport into the cytoplasm. Therefore, neo-glycoproteins primarily act as efficient scavengers of exogenous galectin-3 of cancer cells, inhibiting its interaction with the cell surface, and protecting T-lymphocytes against galectin-3-induced apoptosis. The present neo-glycoproteins combine the advantage of a straightforward synthesis, selectivity, non-toxicity, and high efficiency for targeting exogenous galectin-3, with possible application in the immunomodulatory treatment of galectin-3-overexpressing cancers.
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Affiliation(s)
- Viktoria Heine
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220, Prague 4, Czech Republic; Institute of Biotechnology and Helmholtz Institute for Biomedical Engineering, RWTH Aachen, Pauwelstr. 20, D-52079 Aachen, Germany
| | - Michaela Hovorková
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220, Prague 4, Czech Republic; Department of Genetics and Microbiology, Faculty of Science, Charles University, Viničná 5, CZ-12843, Prague 2, Czech Republic
| | - Miluše Vlachová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220, Prague 4, Czech Republic
| | - Marcela Filipová
- Institute of Macromolecular Chemistry of the Czech Academy of Sciences, Heyrovského Nám. 2, CZ-16206 Prague 6, Czech Republic
| | - Ladislav Bumba
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220, Prague 4, Czech Republic
| | - Olga Janoušková
- Institute of Macromolecular Chemistry of the Czech Academy of Sciences, Heyrovského Nám. 2, CZ-16206 Prague 6, Czech Republic
| | - Martin Hubálek
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 2, CZ-16610 Prague 6, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 2, CZ-16610 Prague 6, Czech Republic
| | - Lucie Petrásková
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220, Prague 4, Czech Republic
| | - Helena Pelantová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220, Prague 4, Czech Republic
| | - Vladimír Křen
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220, Prague 4, Czech Republic
| | - Lothar Elling
- Institute of Biotechnology and Helmholtz Institute for Biomedical Engineering, RWTH Aachen, Pauwelstr. 20, D-52079 Aachen, Germany
| | - Pavla Bojarová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220, Prague 4, Czech Republic.
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20
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Tok OL, Bould J, Dušek M, Cvačka J. One-Pot Synthesis of 2,5-Dihydrosiloles and Their Silole-Annulated Analogs Starting from Alkynylsilanes with a Terminal Alkynyl Group. J Org Chem 2021; 86:3871-3881. [PMID: 33570946 DOI: 10.1021/acs.joc.0c02711] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In contrast to the reaction of vinyl(alkynyl)silanes with 9-BBN-H, leading to the quantitative formation of 5-R-4-(9-BBN)-2,3-dihydro-1H-siloles, treatment of bis(alkynyl)silanes bearing one terminal alkynyl group with 2 equiv of 9-BBN-H followed by methanolysis afforded 5-R-4-(9-BBN)-2,5-dihydro-1H-siloles with yields of 85-90% (by NMR integration). The reaction proceeds via a double 1,2-hydroboration of the terminal triple bond with the formation of the geminal diborane followed by ring closure via intramolecular 1,1-carboboration of the remaining alkynyl fragment. Depending on the nature of the substituent R in position 5, the allylic BBN group locates in position 3 (R = Ph) or position 5 (R = SiHMe2, SiMe3) to give 2,3- or 2,5-dihydrosiloles, respectively. The protodeborylation of the allylic BBN group with MeOH of both 3,4-(9-BBN)2-2,3-dihydro- and 4,5-(9-BBN)2-2,5-dihydrosiloles results in the exclusive formation of 4-(9-BBN)-2,5-dihydrosiloles. In all cases, the formation of 10-12% of 2-R-2,4-(9-BBN)2-2,3-dihydrosilole minor isomers has been observed, which occurs from vicinal diboranes formed as side products by a second hydroboration of the terminal triple bond. Similarly, treatment of the tri- and tetraalkynes containing a terminal triple bond with 2 equiv of 9-BBN-H followed by treatment with methanol resulted in the high-yield formation of 1,2,6,6a-tetrahydro-1,6-disilapentalenes and 2,6,7,7a-tetrahydro-1,6,7-trisila-1H-cyclopenta[a]pentalenes, respectively.
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Affiliation(s)
- Oleg L Tok
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, Husinec-Řež 1001, 25068 Řež, Czech Republic
| | - Jonathan Bould
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, Husinec-Řež 1001, 25068 Řež, Czech Republic
| | - Michal Dušek
- Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 1999/2, 18221 Praha 8, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nam. 2, 16610 Prague 6, Czech Republic
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21
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Rajpurohit S, Vrkoslav V, Hanus R, Gibbs AG, Cvačka J, Schmidt PS. Post-eclosion temperature effects on insect cuticular hydrocarbon profiles. Ecol Evol 2021; 11:352-364. [PMID: 33437434 PMCID: PMC7790616 DOI: 10.1002/ece3.7050] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 10/05/2020] [Revised: 10/22/2020] [Accepted: 10/23/2020] [Indexed: 12/01/2022] Open
Abstract
The insect cuticle is the interface between internal homeostasis and the often harsh external environment. Cuticular hydrocarbons (CHCs) are key constituents of this hard cuticle and are associated with a variety of functions including stress response and communication. CHC production and deposition on the insect cuticle vary among natural populations and are affected by developmental temperature; however, little is known about CHC plasticity in response to the environment experienced following eclosion, during which time the insect cuticle undergoes several crucial changes. We targeted this crucial to important phase and studied post-eclosion temperature effects on CHC profiles in two natural populations of Drosophila melanogaster. A forty-eight hour post-eclosion exposure to three different temperatures (18, 25, and 30°C) significantly affected CHCs in both ancestral African and more recently derived North American populations of D. melanogaster. A clear shift from shorter to longer CHCs chain length was observed with increasing temperature, and the effects of post-eclosion temperature varied across populations and between sexes. The quantitative differences in CHCs were associated with variation in desiccation tolerance among populations. Surprisingly, we did not detect any significant differences in water loss rate between African and North American populations. Overall, our results demonstrate strong genetic and plasticity effects in CHC profiles in response to environmental temperatures experienced at the adult stage as well as associations with desiccation tolerance, which is crucial in understanding holometabolan responses to stress.
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Affiliation(s)
- Subhash Rajpurohit
- Division of Biological and Life SciencesSchool of Arts and SciencesAhmedabad UniversityAhmedabadIndia
- Department of BiologyUniversity of PennsylvaniaPhiladelphiaPAUSA
| | - Vladimír Vrkoslav
- Institute of Organic Chemistry and Biochemistry AS CRPragueCzech Republic
| | - Robert Hanus
- Institute of Organic Chemistry and Biochemistry AS CRPragueCzech Republic
| | - Allen G. Gibbs
- School of Life SciencesUniversity of NevadaLas VegasNVUSA
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry AS CRPragueCzech Republic
| | - Paul S Schmidt
- Department of BiologyUniversity of PennsylvaniaPhiladelphiaPAUSA
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Káňová K, Petrásková L, Pelantová H, Rybková Z, Malachová K, Cvačka J, Křen V, Valentová K. Sulfated Metabolites of Luteolin, Myricetin, and Ampelopsin: Chemoenzymatic Preparation and Biophysical Properties. J Agric Food Chem 2020; 68:11197-11206. [PMID: 32910657 DOI: 10.1021/acs.jafc.0c03997] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Authentic standards of food flavonoids are important for human metabolic studies. Their isolation from biological materials is impracticable; however, they can be prepared in vitro. Twelve sulfated metabolites of luteolin, myricetin, and ampelopsin were obtained with arylsulfotransferase from Desulfitobacterium hafniense and fully characterized by high-performance liquid chromatography, MS, and NMR. The compounds were tested for their ability to scavenge 1,1-diphenyl-2-picrylhydrazyl, 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid), and N,N-dimethyl-p-phenylenediamine radicals, to reduce ferric ions and Folin-Ciocalteu reagent, and to inhibit tert-butyl hydroperoxide-induced lipid peroxidation of rat liver microsomes. The activity differed considerably even between monosulfate isomers. The parent compounds and myricetin-3'-O-sulfate were the most active while other compounds displayed significantly lower activity, particularly luteolin sulfates. No mutagenic activity of the parent compounds and their main metabolites was observed; only myricetin showed minor pro-mutagenicity. The prepared sulfated metabolites are now available as authentic standards for future in vitro and in vivo metabolic studies.
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Affiliation(s)
- Kristýna Káňová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ 142 20 Prague, Czech Republic
- Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, CZ 166 28 Prague, Czech Republic
| | - Lucie Petrásková
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ 142 20 Prague, Czech Republic
| | - Helena Pelantová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ 142 20 Prague, Czech Republic
| | - Zuzana Rybková
- Department of Biology and Ecology, Faculty of Science, University of Ostrava, Chittussiho 10, CZ 710 00 Ostrava, Czech Republic
| | - Kateřina Malachová
- Department of Biology and Ecology, Faculty of Science, University of Ostrava, Chittussiho 10, CZ 710 00 Ostrava, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-16610 Prague, Czech Republic
| | - Vladimír Křen
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ 142 20 Prague, Czech Republic
| | - Kateřina Valentová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ 142 20 Prague, Czech Republic
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Affiliation(s)
- Igor Rončević
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, 16610 Prague 6, Czech Republic
| | - Guillaume Bastien
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, 16610 Prague 6, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, 16610 Prague 6, Czech Republic
| | - Jiří Kaleta
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, 16610 Prague 6, Czech Republic
| | - Josef Michl
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, 16610 Prague 6, Czech Republic
- Department of Chemistry, University of Colorado, Boulder, Colorado 80309-0215, United States
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24
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Nekvasilová P, Kulik N, Rychlá N, Pelantová H, Petrásková L, Bosáková Z, Cvačka J, Slámová K, Křen V, Bojarová P. How Site‐Directed Mutagenesis Boosted Selectivity of a Promiscuous Enzyme. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000604] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Pavlína Nekvasilová
- Institute of Microbiology Czech Academy of Sciences Vídeňská 1083 CZ-14220 Praha 4 Czech Republic
- Department of Genetics and Microbiology Faculty of Science Charles University Viničná 5 CZ-12843 Praha 2 Czech Republic
- Department of Analytical Chemistry Faculty of Science Charles University Hlavova 2030/8. CZ-12843 Praha 2 Czech Republic
| | - Natalia Kulik
- Center for Nanobiology and Structural Biology Institute of Microbiology Czech Academy of Sciences Zámek 136 CZ-37333 Nové Hrady Czech Republic
| | - Nikola Rychlá
- Institute of Microbiology Czech Academy of Sciences Vídeňská 1083 CZ-14220 Praha 4 Czech Republic
- Department of Health Care Disciplines and Population Protection Faculty of Biomedical Engineering Czech Technical University in Prague Nám. Sítná 3105 CZ-27201 Kladno Czech Republic
| | - Helena Pelantová
- Institute of Microbiology Czech Academy of Sciences Vídeňská 1083 CZ-14220 Praha 4 Czech Republic
| | - Lucie Petrásková
- Institute of Microbiology Czech Academy of Sciences Vídeňská 1083 CZ-14220 Praha 4 Czech Republic
| | - Zuzana Bosáková
- Department of Analytical Chemistry Faculty of Science Charles University Hlavova 2030/8. CZ-12843 Praha 2 Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo nám. 2 CZ-16610 Praha 6 Czech Republic
| | - Kristýna Slámová
- Institute of Microbiology Czech Academy of Sciences Vídeňská 1083 CZ-14220 Praha 4 Czech Republic
| | - Vladimír Křen
- Institute of Microbiology Czech Academy of Sciences Vídeňská 1083 CZ-14220 Praha 4 Czech Republic
| | - Pavla Bojarová
- Institute of Microbiology Czech Academy of Sciences Vídeňská 1083 CZ-14220 Praha 4 Czech Republic
- Department of Health Care Disciplines and Population Protection Faculty of Biomedical Engineering Czech Technical University in Prague Nám. Sítná 3105 CZ-27201 Kladno Czech Republic
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Strmeň T, Vrkoslav V, Bosáková Z, Cvačka J. Atmospheric pressure chemical ionization mass spectrometry at low flow rates: Importance of ion source housing. Rapid Commun Mass Spectrom 2020; 34:e8722. [PMID: 31912928 DOI: 10.1002/rcm.8722] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 12/01/2019] [Accepted: 01/06/2020] [Indexed: 06/10/2023]
Abstract
RATIONALE Hyphenation of atmospheric pressure chemical ionization (APCI) mass spectrometry with capillary and micro high-performance liquid chromatography (HPLC) is attractive for many applications, but reliable ion sources dedicated to these conditions are still missing. There are a number of aspects to consider when designing such an ion source, including the susceptibility of the ionization processes to ambient conditions. Here we discuss the importance of ion source housing for APCI at low flow rates. METHODS Selected compounds dissolved in various solvents were used to study ionization reactions at 10 μL/min flow rate. APCI spectra were generated using the Ion Max-S source (Thermo Fisher Scientific) operated with or without the ion source housing. RESULTS The APCI spectra of most compounds measured in the open and enclosed ion sources were markedly different. The differences were explained by water and oxygen molecules that entered the plasma region of the open ion source. Water tended to suppress charge transfer processes while oxygen diminished electron capture reactions and prevented the formation of acetonitrile-related radical cations useful for localizing double bonds in lipids. The effects associated with the ion source housing were significantly less important for compounds that are easy to protonate or deprotonate. CONCLUSIONS The use of ion source housing prevented alternative ionization channels leading to unwanted or unexpected ions. Compared with the conventional flow rate mode (1 mL/min), the effects of ambient air components were significantly higher at 10 μL/min, emphasizing the need for ion source housing in APCI sources dedicated to low flow rates.
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Affiliation(s)
- Timotej Strmeň
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-166 10, Prague 6, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030/8, CZ-128 43, Prague 2, Czech Republic
| | - Vladimír Vrkoslav
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-166 10, Prague 6, Czech Republic
| | - Zuzana Bosáková
- Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030/8, CZ-128 43, Prague 2, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-166 10, Prague 6, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030/8, CZ-128 43, Prague 2, Czech Republic
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Strnad Š, PraŽienková V, Holubová M, Sýkora D, Cvačka J, Maletínská L, Železná B, Kuneš J, Vrkoslav V. Mass spectrometry imaging of free-floating brain sections detects pathological lipid distribution in a mouse model of Alzheimer's-like pathology. Analyst 2020; 145:4595-4605. [PMID: 32436545 DOI: 10.1039/d0an00592d] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Mass spectrometry imaging (MSI) is a modern analytical technique capable of monitoring the spatial distribution of compounds within target tissues. Collection and storage are important steps in sample preparation. The recommended and most widely used preservation procedure for MSI is freezing samples in isopentane and storing them at temperatures below -80 °C. On the other hand, the most common and general method for preserving biological samples in clinical practice is fixation in paraformaldehyde. Special types of samples prepared from these fixed tissues that are used for histology and immunohistochemistry are free-floating sections. It would be very beneficial if the latter procedure could also be applicable for the samples intended for subsequent MSI analysis. In the present work, we optimized and evaluated paraformaldehyde-fixed free-floating sections for the analysis of lipids in mouse brains and used the sections for the study of lipid changes in double transgenic APP/PS1 mice, a model of Alzheimer's-like pathology. Moreover, we examined the neuroprotective properties of palm11-PrRP31, an anorexigenic and glucose-lowering analog of prolactin-releasing peptide, and liraglutide, a type 2 diabetes drug. From the free-floating sections, we obtained lipid images without interference or delocalization, and we demonstrated that free-floating sections can be used for the MSI of lipids. In the APP/PS1 mice, we observed a changed distribution of various lipids compared to the controls. The most significant changes in lipids in the brains of APP/PS1 mice compared to wild-type controls were related to gangliosides (GM2 36:1, GM3 36:1) and phosphatidylinositols (PI 38:4, 36:4) in regions where the accumulation of senile plaques occurred. In APP/PS1 mice peripherally treated with palm11-PrRP31 or liraglutide for 2 months, we found that both peptides reduced the amount and space occupied by lipids, which were linked to the senile plaques. These results indicate that palm11-PrRP31 as well as liraglutide might be potentially useful in the treatment of neurodegenerative diseases.
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Affiliation(s)
- Štěpán Strnad
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, 166 10, Prague, Czech Republic.
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Vrkoslav V, Rumlová B, Strmeň T, Cvačka J. Temperature-programmed capillary high-performance liquid chromatography with atmospheric pressure chemical ionization mass spectrometry for analysis of fatty acid methyl esters. J Sep Sci 2020; 43:2579-2588. [PMID: 32277790 DOI: 10.1002/jssc.201901235] [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: 12/04/2019] [Revised: 04/07/2020] [Accepted: 04/07/2020] [Indexed: 11/10/2022]
Abstract
A new capillary high-performance liquid chromatography method with atmospheric pressure chemical ionization mass spectrometry was developed for the analysis of fatty acid methyl esters and long-chain alcohols. The chromatographic separation was achieved using a Zorbax SB-C18 HPLC column (0.3 × 150 mm, 3.5 μm) with a mobile phase composed of acetonitrile and formic acid and delivered isocratically at a flow rate of 10 μL/min. The column temperature was programmed simply, using a common column oven. Good reproducibility of the temperature profile and retention times were achieved. The temperature programming during the isocratic high-performance liquid chromatography run had a similar effect as a solvent gradient; it reduced retention times of later eluting analytes and improved their detection limits. Two atmospheric pressure chemical ionization sources of the mass spectrometry detector were compared: an enclosed conventional ion source and an in-house made ion source with a glass microchip nebulizer. The enclosed source provided better detectability of saturated fatty acid methyl esters and made it possible to determine the double bond positions using acetonitrile-related adducts, while the open chip-based source provided better analytical figures of merit for unsaturated fatty acid methyl esters. Temperature-programmed capillary high-performance liquid chromatography is a promising method for analyzing neutral lipids in lipidomics and other applications.
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Affiliation(s)
- Vladimír Vrkoslav
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Prague 6, Czech Republic
| | - Barbora Rumlová
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Prague 6, Czech Republic.,Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Prague 2, Czech Republic
| | - Timotej Strmeň
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Prague 6, Czech Republic.,Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Prague 2, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Prague 6, Czech Republic.,Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Prague 2, Czech Republic
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Bould J, Clegg W, Waddell PG, Cvačka J, Dušek M, Londesborough MGS. A Reversible NO-Triggered Multiple Metallaborane Cluster Fusion by Ligand Expulsion/Addition from (PMe 2Ph) 4Pt 2B 10H 10 to Afford (PMe 2Ph) 8Pt 8B 40H 40 and (PMe 2Ph) 5Pt 4B 20H 20. Inorg Chem 2020; 59:5030-5040. [PMID: 32207620 DOI: 10.1021/acs.inorgchem.0c00247] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The dimetallic boron hydride cluster, (PMe2Ph)4Pt2B10H10 (1-Pt2), is known to reversibly sequester small molecules (e.g., O2, CO, and SO2) across its Pt-Pt cluster vector. Here, we report the very different effect of the addition of nitric oxide (NO) to solutions of (1-Pt2) that prompts the elimination of some of its phosphine ligands and the autofusion of the resultant {(PMe2Ph)xPt2B10H10} units to afford the metallaborane conglomerates (PMe2Ph)8Pt8B40H40 (2-Pt8, 38%) and (PMe2Ph)5Pt4B20H20 (3-Pt4, 34%). Single-crystal X-ray studies of these multicluster assemblies reveal the links between the clusters to be a combination of both Pt-Pt bonds and Pt-μH-B 2-electron, 3-center bonds in (2-Pt8) and Pt-μH-B 2-electron, 3-center bonds in (3-Pt4). For compound (2-Pt8), the cluster assemblage can be effectively reversed by the addition of ethyl isonitrile (EtNC) to afford (EtNC)3(PMe2Ph)2Pt2B10H10 4 in quantitative yield. The compounds were characterized by mass spectrometry, multielement NMR spectroscopy, and single-crystal X-ray diffraction studies.
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Affiliation(s)
- Jonathan Bould
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež, 250 68, Czech Republic
| | - William Clegg
- Chemistry, School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne NE1 7RU, U.K
| | - Paul G Waddell
- Chemistry, School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne NE1 7RU, U.K
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-166 10 Prague 6, Czech Republic
| | - Michal Dušek
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech Republic
| | - Michael G S Londesborough
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež, 250 68, Czech Republic
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Hudeček O, Benoni R, Reyes-Gutierrez PE, Culka M, Šanderová H, Hubálek M, Rulíšek L, Cvačka J, Krásný L, Cahová H. Dinucleoside polyphosphates act as 5'-RNA caps in bacteria. Nat Commun 2020; 11:1052. [PMID: 32103016 PMCID: PMC7044304 DOI: 10.1038/s41467-020-14896-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 02/07/2020] [Indexed: 12/12/2022] Open
Abstract
It has been more than 50 years since the discovery of dinucleoside polyphosphates (NpnNs) and yet their roles and mechanisms of action remain unclear. Here, we show that both methylated and non-methylated NpnNs serve as RNA caps in Escherichia coli. NpnNs are excellent substrates for T7 and E. coli RNA polymerases (RNAPs) and efficiently initiate transcription. We demonstrate, that the E. coli enzymes RNA 5′-pyrophosphohydrolase (RppH) and bis(5′-nucleosyl)-tetraphosphatase (ApaH) are able to remove the NpnN-caps from RNA. ApaH is able to cleave all NpnN-caps, while RppH is unable to cleave the methylated forms suggesting that the methylation adds an additional layer to RNA stability regulation. Our work introduces a different perspective on the chemical structure of RNA in prokaryotes and on the role of RNA caps. We bring evidence that small molecules, such as NpnNs are incorporated into RNA and may thus influence the cellular metabolism and RNA turnover. Nicotinamide adenine dinucleotide and coenzyme A serve as a 5′-cap of prokaryotic RNA. Here the authors report that methylated and non-methylated dinucleoside polyphosphates (NpnNs) exist as Escherichia coli RNA caps which can be cleaved by 5′-pyrophosphohydrolase (RppH) and bis(5′-nucleosyl)-tetraphosphatase (ApaH).
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Affiliation(s)
- Oldřich Hudeček
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nam. 2, 16610, Prague 6, Czech Republic
| | - Roberto Benoni
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nam. 2, 16610, Prague 6, Czech Republic
| | - Paul E Reyes-Gutierrez
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nam. 2, 16610, Prague 6, Czech Republic
| | - Martin Culka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nam. 2, 16610, Prague 6, Czech Republic
| | - Hana Šanderová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, 142 20, Prague, Czech Republic
| | - Martin Hubálek
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nam. 2, 16610, Prague 6, Czech Republic
| | - Lubomír Rulíšek
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nam. 2, 16610, Prague 6, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nam. 2, 16610, Prague 6, Czech Republic
| | - Libor Krásný
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, 142 20, Prague, Czech Republic
| | - Hana Cahová
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nam. 2, 16610, Prague 6, Czech Republic.
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Akkol EK, Šmejkal K, Kurtul E, Ilhan M, Güragac FT, İşcan GS, Acıkara ÖB, Cvačka J, Buděšínský M. Inhibitory activity of Scorzonera latifolia and its components on enzymes connected with healing process. J Ethnopharmacol 2019; 245:112168. [PMID: 31430525 DOI: 10.1016/j.jep.2019.112168] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 06/28/2019] [Accepted: 08/14/2019] [Indexed: 06/10/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Scorzonera latifolia (Fisch. & Mey.) DC. (Asteraceae) grows naturally in Eastern Anatolia, northeastern Iran, and Caucasus. Latex of S. latifolia roots is used in Turkish folk medicine for its analgesic effects, externally to cure infertility in women, and internally as an antihelmintic. The milk obtained from the stem of the Scorzonera species is used for wound healing activity. Antinociceptive, anti-inflammatory, wound-healing, antioxidant, and antimicrobial activities have previously been reported for S. latifolia. AIM OF THE STUDY A methanol extract of the aerial parts of Scorzonera latifolia that had been shown to possess wound-healing activity, was used to elucidate the possible mechanism of the wound-healing activity and to identify the compound(s) responsible for the effect by means of bioassay-guided fractionation. MATERIALS AND METHODS The wound-healing activity potential of methanol extract of S. latifolia was detected by evaluating the inhibitory activity on the collagenase, hyaluronidase and elastase, which play important roles in the wound-healing process. Succesive fractionation of the methanol extract using petroleum ether, chloroform, ethyl acetate, respectively, and the residual wateryielded four respective fractions. The ethyl acetate part, which was determined as the most active fraction, was selected for further separation using chromatographic techniques. RESULTS Ethylacetate fraction exhibited significant inhibitory activities on collagenase and elastase. Chromatographic separation of the ethylacetate extract yielded an active subfraction, from which was used to isolate quercetin-3-O-β-apiofuranosyl-(1'''→2'')-β-D-glucopyranoside (1), quercetin-3-O-α-rhamnopyranosyl-(1→6)-β-D-galactopyranoside (2), isoorientin (3), and 7-methylisoorientin (4). Of the compounds tested, 7-methylisoorientin (4) exerted inhibitory activity on collagenase and elastase, while quercetin-3-O-β-apiofuranosyl-(1'''→2'')-β-glucopyranoside (1) inhibited collagenase only. None of the fractions, or isolated compounds showed any inhibitory effect on hyaluronidase. It must be mentioned, that in vitro tests showed that compounds 1-4 inhibit the collagenase and elastase and could help wound-healing process. However, the inhibititory effect of the methanol extract appears to be greater than that of both of the ethylacetate fraction, subfraction G and the isolated compounds, which suggest that a synergistic interaction of several compounds could be responsible for the wound-healing activity of the aerial parts of S. latifolia.
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Affiliation(s)
- Esra Küpeli Akkol
- Department of Pharmacognosy, Faculty of Pharmacy, Gazi University, Etiler, 06330, Ankara, Turkey
| | - Karel Šmejkal
- Department of Natural Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, Palackého 1946/1, 61242, Brno, Czech Republic
| | - Ekin Kurtul
- Department of Pharmacognosy, Faculty of Pharmacy, Ankara University, Tandoğan, 06100, Ankara, Turkey
| | | | - Fatma Tuğçe Güragac
- Department of Pharmacognosy, Faculty of Pharmacy, Gazi University, Etiler, 06330, Ankara, Turkey
| | - Gülçin Saltan İşcan
- Department of Pharmacognosy, Faculty of Pharmacy, Ankara University, Tandoğan, 06100, Ankara, Turkey
| | - Özlem Bahadır Acıkara
- Department of Pharmacognosy, Faculty of Pharmacy, Ankara University, Tandoğan, 06100, Ankara, Turkey.
| | - Josef Cvačka
- Mass Spectrometry Group, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovonám. 2, CZ-16610, Prague, Czech Republic
| | - Miloš Buděšínský
- NMR Group, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovonám. 2, CZ-16610, Prague, Czech Republic
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31
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Poad BLJ, Marshall DL, Harazim E, Gupta R, Narreddula VR, Young RSE, Duchoslav E, Campbell JL, Broadbent JA, Cvačka J, Mitchell TW, Blanksby SJ. Combining Charge-Switch Derivatization with Ozone-Induced Dissociation for Fatty Acid Analysis. J Am Soc Mass Spectrom 2019; 30:2135-2143. [PMID: 31347025 DOI: 10.1007/s13361-019-02285-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 07/07/2019] [Accepted: 07/08/2019] [Indexed: 06/10/2023]
Abstract
The specific positions of carbon-carbon double bond(s) within an unsaturated fatty acid exert a significant effect on the physical and chemical properties of the lipid that ultimately inform its biological function(s). Contemporary liquid chromatography-mass spectrometry (MS) strategies based on electrospray ionization coupled to tandem MS can easily detect fatty acyl lipids but generally cannot reveal those specific site(s) of unsaturation. Herein, we describe a novel and versatile workflow whereby fatty acids are first converted to fixed charge N-(4-aminomethylphenyl)pyridinium (AMPP) derivatives and subsequently subjected to ozone-induced dissociation (OzID) on a modified triple quadrupole mass spectrometer. The AMPP modification enhances the detection of fatty acids introduced by direct infusion. Fragmentation of the derivatized fatty acids also provides diagnostic fragment ions upon collision-induced dissociation that can be targeted in precursor ion scans to subsequently trigger OzID analyses in an automated data-dependent workflow. It is these OzID analyses that provide unambiguous assignment of carbon-carbon double bond locations in the AMPP-derivatized fatty acids. The performance of this analysis pipeline is assessed in profiling the patterns of unsaturation in fatty acids within the complex biological secretion vernix caseosa. This analysis uncovers significant isomeric diversity within the fatty acid pool of this sample, including a number of hitherto unreported double bond positional isomers that hint at the activity of potentially new metabolic pathways.
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Affiliation(s)
- Berwyck L J Poad
- Central Analytical Research Facility, Queensland University of Technology, Brisbane, Australia.
| | - David L Marshall
- Central Analytical Research Facility, Queensland University of Technology, Brisbane, Australia
| | - Eva Harazim
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Rajesh Gupta
- Central Analytical Research Facility, Queensland University of Technology, Brisbane, Australia
| | - Venkateswara R Narreddula
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, Australia
| | - Reuben S E Young
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, Australia
| | | | | | - James A Broadbent
- SCIEX, Concord, ON, Canada
- CSIRO Agriculture and Food, St Lucia, Queensland, 4067, Australia
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Todd W Mitchell
- School of Medicine and Molecular Horizons, University of Wollongong, Wollongong, Australia
| | - Stephen J Blanksby
- Central Analytical Research Facility, Queensland University of Technology, Brisbane, Australia.
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32
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Strnad Š, Pražienková V, Sýkora D, Cvačka J, Maletínská L, Popelová A, Vrkoslav V. The use of 1,5-diaminonaphthalene for matrix-assisted laser desorption/ionization mass spectrometry imaging of brain in neurodegenerative disorders. Talanta 2019; 201:364-372. [DOI: 10.1016/j.talanta.2019.03.117] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 03/29/2019] [Accepted: 03/30/2019] [Indexed: 12/17/2022]
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Kirakci K, Zelenka J, Rumlová M, Cvačka J, Ruml T, Lang K. Cationic octahedral molybdenum cluster complexes functionalized with mitochondria-targeting ligands: photodynamic anticancer and antibacterial activities. Biomater Sci 2019; 7:1386-1392. [PMID: 30656318 DOI: 10.1039/c8bm01564c] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Octahedral molybdenum cluster complexes have recently come forth as pertinent singlet oxygen photosensitizers towards biological applications. Still, their phototoxic efficiency in the absence of nanocarriers remains limited due to their poor cellular uptake. Here, two cationic octahedral molybdenum cluster complexes, bearing carboxylate ligands with triphenylphosphonium (1) or N-methyl pyridinium (2) mitochondria-targeting terminal functions, have been designed and synthesized. Their photophysical properties in water and in vitro biological activity were investigated in the context of blue-light photodynamic therapy of cancer and photoinactivation of bacteria. Upon blue light irradiation, complex 1 displays red luminescence with a quantum yield of 0.24 in water, whereas complex 2 is much less emissive (ΦL < 0.01). Nevertheless, both complexes efficiently produce singlet oxygen, O2(1Δg). Complex 1 is rapidly internalized into HeLa cells and accumulated in mitochondria, followed by relocation to lysosomes and clearance at longer times. In contrast, the more hydrophilic 2 is not internalized into HeLa cells, highlighting the effect of the apical ligands on the uptake properties. The treatment with 1 results in an intensive phototoxic effect under 460 nm irradiation (IC50 = 0.10 ± 0.02 μM), which exceeds by far those previously reported for octahedral cluster-based molecular photosensitizers. The ratio between phototoxicity and dark toxicity is approximately 50 and evidences a therapeutic window for the application of 1 in blue-light photodynamic therapy. Complex 1 also enters and efficiently photoinactivates Gram-positive bacteria Enterococcus faecalis and Staphylococcus aureus, documenting its suitability as a blue-light photosensitizer for antimicrobial applications.
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Affiliation(s)
- Kaplan Kirakci
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68 Husinec-ŘeŽ, Czech Republic.
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Bassanini I, Kapešová J, Petrásková L, Pelantová H, Markošová K, Rebroš M, Valentová K, Kotik M, Káňová K, Bojarová P, Cvačka J, Turková L, Ferrandi EE, Bayout I, Riva S, Křen V. Glycosidase‐Catalyzed Synthesis of Glycosyl Esters and Phenolic Glycosides of Aromatic Acids. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900259] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Ivan Bassanini
- Istituto di Chimica del Riconoscimento MolecolareConsiglio Nazionale delle Ricerche Via Mario Bianco 9 I 20131 Milano Italy
- Dipartimento di Scienze FarmaceuticheUniversità degli Studi di Milano Via Mangiagalli 25 I 20131 Milano Italy
| | - Jana Kapešová
- Institute of Microbiology of the Czech Academy of Sciences Vídeňská 1083 CZ 14220 Prague 4 Czech Republic
| | - Lucie Petrásková
- Institute of Microbiology of the Czech Academy of Sciences Vídeňská 1083 CZ 14220 Prague 4 Czech Republic
| | - Helena Pelantová
- Institute of Microbiology of the Czech Academy of Sciences Vídeňská 1083 CZ 14220 Prague 4 Czech Republic
| | - Kristína Markošová
- Institute of BiotechnologySlovak University of Technology Radlinského 9 SK 81237 Bratislava Slovakia
| | - Martin Rebroš
- Institute of BiotechnologySlovak University of Technology Radlinského 9 SK 81237 Bratislava Slovakia
| | - Kateřina Valentová
- Institute of Microbiology of the Czech Academy of Sciences Vídeňská 1083 CZ 14220 Prague 4 Czech Republic
| | - Michael Kotik
- Institute of Microbiology of the Czech Academy of Sciences Vídeňská 1083 CZ 14220 Prague 4 Czech Republic
| | - Kristýna Káňová
- Institute of Microbiology of the Czech Academy of Sciences Vídeňská 1083 CZ 14220 Prague 4 Czech Republic
| | - Pavla Bojarová
- Institute of Microbiology of the Czech Academy of Sciences Vídeňská 1083 CZ 14220 Prague 4 Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of theCzech Academy of Sciences Flemingovo nám. 2 CZ 16610 Prague 6 Czech Republic
| | - Lucie Turková
- Institute of Microbiology of the Czech Academy of Sciences Vídeňská 1083 CZ 14220 Prague 4 Czech Republic
| | - Erica E. Ferrandi
- Istituto di Chimica del Riconoscimento MolecolareConsiglio Nazionale delle Ricerche Via Mario Bianco 9 I 20131 Milano Italy
| | - Ikram Bayout
- Istituto di Chimica del Riconoscimento MolecolareConsiglio Nazionale delle Ricerche Via Mario Bianco 9 I 20131 Milano Italy
- Asymmetric Catalysis Laboratory (LCAE)Badji Mokhtar Annaba-University B.P. 12 23000 Annaba Algeria
| | - Sergio Riva
- Istituto di Chimica del Riconoscimento MolecolareConsiglio Nazionale delle Ricerche Via Mario Bianco 9 I 20131 Milano Italy
| | - Vladimír Křen
- Institute of Microbiology of the Czech Academy of Sciences Vídeňská 1083 CZ 14220 Prague 4 Czech Republic
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Tok OL, Lang K, Růžička A, Cvačka J. Helicenes Built from Silacyclopentadienes via Ring-by-Ring Knitting of the Helical Framework. Angew Chem Int Ed Engl 2019; 58:1654-1658. [PMID: 30548911 DOI: 10.1002/anie.201811140] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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: 09/27/2018] [Revised: 11/14/2018] [Indexed: 12/25/2022]
Abstract
Despite the apparent diversity of the protocols developed for the synthesis of helicenes, they essentially follow the same strategy: the closure of one, or several, internal rings in a key step. Herein, we report the synthesis of a new family of the heterohelicenes consisting of fused silacyclopentadiene rings formed via a facile and novel process. The treatment of oligo(alkynilydenesilylene) precursors of type H2 C=CH-(SiMe2 -C≡C)n -R (n=3-7), bearing a vinyl group on the terminal silicon atom, with 9-borabicyclononane leads first to 1,2-hydroboration of the terminal double bond which then continues with a cascade of intramolecular 1,1-carboboration reactions accompanied with the closure of a new silole ring after each step affording the target silahelicenes with, currently, up to seven condensed silole rings and with excellent yields. According XRD analysis, the seven fused silole rings of the heptacyclic compound 11 b form an almost complete turn of a helix. The presented one-pot sequence of reactions is the first example of ring-by-ring knitting of a helical framework starting from easily available linear precursors.
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Affiliation(s)
- Oleg L Tok
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 25068, Řež, Czech Republic
| | - Kamil Lang
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 25068, Řež, Czech Republic
| | - Aleš Růžička
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 53210, Pardubice, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nam. 2, 16610, Prague 6, Czech Republic
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Palma-Onetto V, Pflegerová J, Plarre R, Synek J, Cvačka J, Sillam-Dussès D, Šobotník J. The labral gland in termites: evolution and function. Biol J Linn Soc Lond 2019. [DOI: 10.1093/biolinnean/bly212] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Valeria Palma-Onetto
- University Paris 13 - Sorbonne Paris Cité, Laboratory of Experimental and Comparative Ethology, Villetaneuse, France
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Prague, Czech Republic
| | - Jitka Pflegerová
- Institute of Entomology, Biology Centre, Academy of Sciences of the Czech Republic, České Budějovice, Czech Republic
| | - Rudy Plarre
- Bundesanstalt für Materialforschung und -prüfung, Berlin, Germany
| | - Jiří Synek
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Prague, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic
| | - David Sillam-Dussès
- University Paris 13 - Sorbonne Paris Cité, Laboratory of Experimental and Comparative Ethology, Villetaneuse, France
| | - Jan Šobotník
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Prague, Czech Republic
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Tok OL, Lang K, Růžička A, Cvačka J. Helicenes Built from Silacyclopentadienes via Ring‐by‐Ring Knitting of the Helical Framework. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201811140] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Oleg L. Tok
- Institute of Inorganic ChemistryAcademy of Sciences of the Czech Republic 25068 Řež Czech Republic
| | - Kamil Lang
- Institute of Inorganic ChemistryAcademy of Sciences of the Czech Republic 25068 Řež Czech Republic
| | - Aleš Růžička
- Department of General and Inorganic ChemistryFaculty of Chemical TechnologyUniversity of Pardubice Studentská 573 53210 Pardubice Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and BiochemistryAcademy of Sciences of the Czech Republic Flemingovo nam. 2 16610 Prague 6 Czech Republic
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Bojarová P, Kulik N, Slámová K, Hubálek M, Kotik M, Cvačka J, Pelantová H, Křen V. Selective β-N-acetylhexosaminidase from Aspergillus versicolor—a tool for producing bioactive carbohydrates. Appl Microbiol Biotechnol 2019; 103:1737-1753. [DOI: 10.1007/s00253-018-9534-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 11/05/2018] [Accepted: 11/17/2018] [Indexed: 12/21/2022]
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Vrkoslav V, Muck A, Brown JM, Hubálek M, Cvačka J. The matrix-assisted laser desorption/ionisation in-source decay of peptides using ion mobility enabled quadrupole-time-of-flight mass spectrometry. Rapid Commun Mass Spectrom 2018; 32:2099-2105. [PMID: 30230090 DOI: 10.1002/rcm.8284] [Citation(s) in RCA: 2] [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] [Received: 06/29/2018] [Revised: 09/12/2018] [Accepted: 09/13/2018] [Indexed: 06/08/2023]
Abstract
RATIONALE In-source decay (ISD) matrix-assisted laser desorption/ionisation (MALDI) mass spectrometry with a 1,5-diaminonaphthalene (1,5-DAN) matrix is used for the structural characterisation of peptides. However, MALDI spectra are intrinsically complicated by the presence of matrix ions, which interfere with the peptide fragments. This may cause false-positive results or reduced sequence coverage. This paper reports investigations of ISD processes in an intermediate pressure MALDI ion source and a protocol for the removal of interfering ions using ion mobility separation (IMS). METHODS An intermediate pressure MALDI source of a Q-IMS-Q-TOF instrument (Synapt G2) has been employed for the ISD of selected peptides using a 1,5-DAN matrix. RESULTS Successful coupling of the MALDI source tuned for ISD experiments using IMS is demonstrated. The IMS made it possible to remove interfering matrix ions effectively from the spectra and thus to increase the confidence of spectral interpretation. Extensive fragment series corresponding to N-Cα bond cleavages were observed under optimised conditions; on the other hand, weaker series of ions caused by peptide bond cleavages were prevalent for default conditions and/or the α-hydroxycinnamic acid matrix. CONCLUSIONS Ion mobility has been used for the elimination of matrix ions. The technique has been applied to top-down sequencing of non-tryptic peptides, such as the human palmitoylated analogue of prolactin-releasing peptide used in recent obesity studies, and human and insect antimicrobial peptides.
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Affiliation(s)
- Vladimír Vrkoslav
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, Prague 6, 166 10, Czech Republic
| | | | - Jeffery M Brown
- Waters Corporation, Stamford Avenue, Altrincham Road, Wilmslow, SK9 4AX, UK
| | - Martin Hubálek
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, Prague 6, 166 10, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, Prague 6, 166 10, Czech Republic
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Harazim E, Vrkoslav V, Buděšínský M, Harazim P, Svoboda M, Plavka R, Bosáková Z, Cvačka J. Nonhydroxylated 1- O-acylceramides in vernix caseosa. J Lipid Res 2018; 59:2164-2173. [PMID: 30254076 PMCID: PMC6210899 DOI: 10.1194/jlr.m088864] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [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: 08/01/2018] [Revised: 09/21/2018] [Indexed: 01/22/2023] Open
Abstract
Vernix caseosa, the waxy substance that coats the skin of newborn babies, has an extremely complex lipid composition. We have explored these lipids and identified nonhydroxylated 1-O-acylceramides (1-O-ENSs) as a new class of lipids in vernix caseosa. These ceramides mostly contain saturated C11-C38 ester-linked (1-O) acyls, saturated C12-C39 amide-linked acyls, and C16-C24 sphingoid bases. Because their fatty acyl chains are frequently branched, numerous molecular species were separable and detectable by HPLC/MS: we found more than 2,300 molecular species, 972 of which were structurally characterized. The most abundant 1-O-ENSs contained straight-chain and branched fatty acyls with 20, 22, 24, or 26 carbons in the 1-O position, 24 or 26 carbons in the N position, and sphingosine. The 1-O-ENSs were isolated using multistep TLC and HPLC and they accounted for 1% of the total lipid extract. The molecular species of 1-O-ENSs were separated on a C18 HPLC column using an acetonitrile/propan-2-ol gradient and detected by APCI-MS, and the structures were elucidated by high-resolution and tandem MS. Medium-polarity 1-O-ENSs likely contribute to the cohesiveness and to the waterproofing and moisturizing properties of vernix caseosa.
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Affiliation(s)
- Eva Harazim
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, CZ-166 10 Praha 6, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University, CZ-128 43 Praha 2, Czech Republic
| | - Vladimír Vrkoslav
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, CZ-166 10 Praha 6, Czech Republic
| | - Miloš Buděšínský
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, CZ-166 10 Praha 6, Czech Republic
| | - Petr Harazim
- Department of Concrete and Masonry Structures, Faculty of Civil Engineering, Czech Technical University in Prague, CZ-166 29 Praha 6, Czech Republic
| | - Martin Svoboda
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, CZ-166 10 Praha 6, Czech Republic
| | - Richard Plavka
- Department of Obstetrics and Gynecology, First Faculty of Medicine, Charles University and General University Hospital in Prague, CZ-128 00 Praha 2, Czech Republic
| | - Zuzana Bosáková
- Department of Analytical Chemistry, Faculty of Science, Charles University, CZ-128 43 Praha 2, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, CZ-166 10 Praha 6, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University, CZ-128 43 Praha 2, Czech Republic
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41
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Valentová K, Purchartová K, Rydlová L, Roubalová L, Biedermann D, Petrásková L, Křenková A, Pelantová H, Holečková-Moravcová V, Tesařová E, Cvačka J, Vrba J, Ulrichová J, Křen V. Sulfated Metabolites of Flavonolignans and 2,3-Dehydroflavonolignans: Preparation and Properties. Int J Mol Sci 2018; 19:E2349. [PMID: 30096957 PMCID: PMC6121260 DOI: 10.3390/ijms19082349] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2018] [Revised: 07/31/2018] [Accepted: 08/06/2018] [Indexed: 12/16/2022] Open
Abstract
Silymarin, an extract from milk thistle (Silybum marianum) fruits, is consumed in various food supplements. The metabolism of silymarin flavonolignans in mammals is complex, the exact structure of their metabolites still remains partly unclear and standards are not commercially available. This work is focused on the preparation of sulfated metabolites of silymarin flavonolignans. Sulfated flavonolignans were prepared using aryl sulfotransferase from Desulfitobacterium hafniense and p-nitrophenyl sulfate as a sulfate donor and characterized by high-resolution mass spectrometry (HRMS) and nuclear magnetic resonance (NMR). Their 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), and N,N-dimethyl-p-phenylenediamine (DMPD) radical scavenging; ferric (FRAP) and Folin⁻Ciocalteu reagent (FCR) reducing activity; anti-lipoperoxidant potential; and effect on the nuclear erythroid 2-related factor 2 (Nrf2) signaling pathway were examined. Pure silybin A 20-O-sulfate, silybin B 20-O-sulfate, 2,3-dehydrosilybin-20-O-sulfate, 2,3-dehydrosilybin-7,20-di-O-sulfate, silychristin-19-O-sulfate, 2,3-dehydrosilychristin-19-O-sulfate, and silydianin-19-O-sulfate were prepared and fully characterized. Sulfated 2,3-dehydroderivatives were more active in FCR and FRAP assays than the parent compounds, and remaining sulfates were less active chemoprotectants. The sulfated flavonolignans obtained can be now used as authentic standards for in vivo metabolic experiments and for further research on their biological activity.
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Affiliation(s)
- Kateřina Valentová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, 14220 Prague, Czech Republic.
| | - Kateřina Purchartová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, 14220 Prague, Czech Republic.
- Faculty of Science, Charles University, Department of Physical and Macromolecular Chemistry, Hlavova 2030/8, 12843 Prague, Czech Republic.
| | - Lenka Rydlová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, 14220 Prague, Czech Republic.
- Faculty of Science, Charles University, Department of Physical and Macromolecular Chemistry, Hlavova 2030/8, 12843 Prague, Czech Republic.
| | - Lenka Roubalová
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacký University, Hněvotínská 3, 77515 Olomouc, Czech Republic.
- Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacký University, Hněvotínská 3, 77515 Olomouc, Czech Republic.
| | - David Biedermann
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, 14220 Prague, Czech Republic.
| | - Lucie Petrásková
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, 14220 Prague, Czech Republic.
| | - Alena Křenková
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, 14220 Prague, Czech Republic.
| | - Helena Pelantová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, 14220 Prague, Czech Republic.
| | | | - Eva Tesařová
- Faculty of Science, Charles University, Department of Physical and Macromolecular Chemistry, Hlavova 2030/8, 12843 Prague, Czech Republic.
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, 16610 Prague, Czech Republic.
| | - Jiří Vrba
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacký University, Hněvotínská 3, 77515 Olomouc, Czech Republic.
- Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacký University, Hněvotínská 3, 77515 Olomouc, Czech Republic.
| | - Jitka Ulrichová
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacký University, Hněvotínská 3, 77515 Olomouc, Czech Republic.
- Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacký University, Hněvotínská 3, 77515 Olomouc, Czech Republic.
| | - Vladimír Křen
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, 14220 Prague, Czech Republic.
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42
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Vrkoslav V, Rumlová B, Strmeň T, Nekvasilová P, Šulc M, Cvačka J. Applicability of low-flow atmospheric pressure chemical ionization and photoionization mass spectrometry with a microfabricated nebulizer for neutral lipids. Rapid Commun Mass Spectrom 2018; 32:639-648. [PMID: 29457286 DOI: 10.1002/rcm.8086] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 02/05/2018] [Accepted: 02/06/2018] [Indexed: 06/08/2023]
Abstract
RATIONALE Mass spectrometry with atmospheric pressure chemical ionization (APCI) or photoionization (APPI) is widely used for neutral lipids involved in many fundamental processes in living organisms. Commercial APCI and APPI sources operate at high flow rates compatible with conventional high-performance liquid chromatography (HPLC). However, lipid analysis is often limited by a small amount of sample, which requires low flow rate separations like capillary or micro-HPLC. Therefore, APCI and APPI suitable for microliter-per-minute flow rates need to be developed and applied for neutral lipids. METHODS A micro-APCI/APPI source with a heated chip nebulizer was assembled and mounted on a Thermo ion trap instrument. The ion source operated in APCI, APPI or dual mode was optimized for low microliter-per-minute sample flow rates. The source performance was investigated for squalene, wax esters, fatty acid methyl esters, triacylglycerols, and cholesterol. RESULTS The ion source behaved as a mass-flow-sensitive detector. Direct infusion of methyl oleate showed superior analytical figures of merit when compared with high-flow ion sources. A detection limit of 200 pmol/mL and a linear dynamic range spanning three orders of magnitude were measured for micro-APCI. The mass spectra of most lipids differed from high flow rate spectra. Unlike micro-APCI, micro-APPI spectra were complicated by odd-electron species. Dual APCI/APPI mode did not show any benefits for neutral lipids. Applications for lipid samples were demonstrated. CONCLUSIONS Micro-APCI-MS is a useful detection technique for neutral lipids at microliter-per-minute flow rates. It offers high sensitivity and high quality of spectra in direct infusion mode and promises successful utilization in capillary and micro-HPLC applications.
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Affiliation(s)
- Vladimír Vrkoslav
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-166 10, Prague 6, Czech Republic
| | - Barbora Rumlová
- Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030/8, CZ-128 43, Prague 2, Czech Republic
| | - Timotej Strmeň
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-166 10, Prague 6, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030/8, CZ-128 43, Prague 2, Czech Republic
| | - Pavlína Nekvasilová
- Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030/8, CZ-128 43, Prague 2, Czech Republic
| | - Miloslav Šulc
- Czech University of Life Sciences, Faculty of Agrobiology Natural and Food Resources, Department of Chemistry, Kamýcká 129, CZ-165 00, Prague 6, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-166 10, Prague 6, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030/8, CZ-128 43, Prague 2, Czech Republic
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43
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Sobol M, Krausová A, Yildirim S, Kalasová I, Fáberová V, Vrkoslav V, Philimonenko V, Marášek P, Pastorek L, Čapek M, Lubovská Z, Uličná L, Tsuji T, Lísa M, Cvačka J, Fujimoto T, Hozak P. Nuclear phosphatidylinositol 4,5-bisphosphate islets contribute to efficient RNA polymerase II-dependent transcription. J Cell Sci 2018; 131:jcs.211094. [PMID: 29507116 DOI: 10.1242/jcs.211094] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [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: 09/22/2017] [Accepted: 02/22/2018] [Indexed: 12/18/2022] Open
Abstract
This paper describes a novel type of nuclear structure - nuclear lipid islets (NLIs). They are of 40-100 nm with a lipidic interior, and phosphatidylinositol 4,5-bisphosphate [PtdIns(4,5)P2] molecules comprise a significant part of their surface. Most of NLIs have RNA at the periphery. Consistent with that, RNA is required for their integrity. The NLI periphery is associated with Pol II transcription machinery, including the largest Pol II subunit, transcription factors and NM1 (also known as NMI). The PtdIns(4,5)P2-NM1 interaction is important for Pol II transcription, since NM1 knockdown reduces the Pol II transcription level, and the overexpression of wild-type NM1 [but not NM1 mutated in the PtdIns(4,5)P2-binding site] rescues the transcription. Importantly, Pol II transcription is dependent on NLI integrity, because an enzymatic reduction of the PtdIns(4,5)P2 level results in a decrease of the Pol II transcription level. Furthermore, about half of nascent transcripts localise to NLIs, and transcriptionally active transgene loci preferentially colocalise with NLIs. We hypothesize that NLIs serve as a structural platform that facilitates the formation of Pol II transcription factories, thus participating in the formation of nuclear architecture competent for transcription.
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Affiliation(s)
- Margarita Sobol
- Institute of Molecular Genetics, CAS, v.v.i., Department of Biology of the Cell Nucleus, Vídeňská 1083, 142 20, Prague 4, Czech Republic
| | - Alžběta Krausová
- Institute of Molecular Genetics, CAS, v.v.i., Department of Biology of the Cell Nucleus, Vídeňská 1083, 142 20, Prague 4, Czech Republic
| | - Sukriye Yildirim
- Institute of Molecular Genetics, CAS, v.v.i., Department of Biology of the Cell Nucleus, Vídeňská 1083, 142 20, Prague 4, Czech Republic
| | - Ilona Kalasová
- Institute of Molecular Genetics, CAS, v.v.i., Department of Biology of the Cell Nucleus, Vídeňská 1083, 142 20, Prague 4, Czech Republic
| | - Veronika Fáberová
- Institute of Molecular Genetics, CAS, v.v.i., Department of Biology of the Cell Nucleus, Vídeňská 1083, 142 20, Prague 4, Czech Republic
| | - Vladimír Vrkoslav
- Institute of Organic Chemistry and Biochemistry, CAS, v.v.i., Research Service Group of Mass Spectrometry, Flemingovo náměstí 2, 166 10, Prague 6, Czech Republic
| | - Vlada Philimonenko
- Institute of Molecular Genetics, CAS, v.v.i., Department of Biology of the Cell Nucleus, Vídeňská 1083, 142 20, Prague 4, Czech Republic.,Institute of Molecular Genetics, CAS, v.v.i., Electron Microscopy Core Facility, Vídeňská 1083, 142 20, Prague 4, Czech Republic
| | - Pavel Marášek
- Institute of Molecular Genetics, CAS, v.v.i., Department of Biology of the Cell Nucleus, Vídeňská 1083, 142 20, Prague 4, Czech Republic
| | - Lukáš Pastorek
- Institute of Molecular Genetics, CAS, v.v.i., Department of Biology of the Cell Nucleus, Vídeňská 1083, 142 20, Prague 4, Czech Republic.,Institute of Molecular Genetics, CAS, v.v.i., Electron Microscopy Core Facility, Vídeňská 1083, 142 20, Prague 4, Czech Republic
| | - Martin Čapek
- Institute of Molecular Genetics, CAS, v.v.i., Light Microscopy Core Facility, Vídeňská 1083, 142 20, Prague 4, Czech Republic
| | - Zuzana Lubovská
- Institute of Molecular Genetics, CAS, v.v.i., Electron Microscopy Core Facility, Vídeňská 1083, 142 20, Prague 4, Czech Republic
| | - Lívia Uličná
- Institute of Molecular Genetics, CAS, v.v.i., Department of Biology of the Cell Nucleus, Vídeňská 1083, 142 20, Prague 4, Czech Republic
| | - Takuma Tsuji
- Nagoya University Graduate School of Medicine, Department of Molecular Cell Biology, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan
| | - Miroslav Lísa
- University of Pardubice, Faculty of Chemical Technology, Department of Analytical Chemistry, Studentská 573, 532 10, Pardubice, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry, CAS, v.v.i., Research Service Group of Mass Spectrometry, Flemingovo náměstí 2, 166 10, Prague 6, Czech Republic
| | - Toyoshi Fujimoto
- Nagoya University Graduate School of Medicine, Department of Molecular Cell Biology, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan
| | - Pavel Hozak
- Institute of Molecular Genetics, CAS, v.v.i., Department of Biology of the Cell Nucleus, Vídeňská 1083, 142 20, Prague 4, Czech Republic .,Institute of Molecular Genetics, CAS, v.v.i., Division BIOCEV, Laboratory of Epigenetics of the Cell Nucleus, Průmyslová 595, 252 50, Vestec, Czech Republic.,Institute of Molecular Genetics, CAS, v.v.i., Microscopy Centre, Vídeňská 1083, 142 20, Prague 4, Czech Republic
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44
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Strmeň T, Vrkoslav V, Pačes O, Cvačka J. Evaluation of an ion source with a tubular nebulizer for microflow atmospheric pressure chemical ionization. Monatsh Chem 2018. [DOI: 10.1007/s00706-018-2172-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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45
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Daňhel A, Trošanová Z, Balintová J, Simonová A, Pospíšil L, Cvačka J, Hocek M, Fojta M. Electrochemical reduction of azidophenyl-deoxynucleoside conjugates at mercury surface. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2017.10.128] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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46
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Mundil R, Sokolohorskyj A, Hošek J, Cvačka J, Císařová I, Kvíčala J, Merna J. Nickel and palladium complexes with fluorinated alkyl substituted α-diimine ligands for living/controlled olefin polymerization. Polym Chem 2018. [DOI: 10.1039/c8py00201k] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Living/controlled olefin polymerization is displayed by novel nickel and palladium diimine catalysts with fluorinated tails.
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Affiliation(s)
- Robert Mundil
- Department of Polymers
- University of Chemistry and Technology
- 166 28 Prague 6
- Czech Republic
| | - Anatolij Sokolohorskyj
- Department of Polymers
- University of Chemistry and Technology
- 166 28 Prague 6
- Czech Republic
| | - Jan Hošek
- Department of Organic Chemistry
- University of Chemistry and Technology
- 166 28 Prague 6
- Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry v.v.i
- Academy of Sciences of the Czech Republic
- Prague 6
- Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University in Prague
- 128 40 Prague 2
- Czech Republic
| | - Jaroslav Kvíčala
- Department of Organic Chemistry
- University of Chemistry and Technology
- 166 28 Prague 6
- Czech Republic
| | - Jan Merna
- Department of Polymers
- University of Chemistry and Technology
- 166 28 Prague 6
- Czech Republic
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47
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Valentová K, Káňová K, Di Meo F, Pelantová H, Chambers CS, Rydlová L, Petrásková L, Křenková A, Cvačka J, Trouillas P, Křen V. Chemoenzymatic Preparation and Biophysical Properties of Sulfated Quercetin Metabolites. Int J Mol Sci 2017; 18:ijms18112231. [PMID: 29068411 PMCID: PMC5713201 DOI: 10.3390/ijms18112231] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 10/02/2017] [Accepted: 10/20/2017] [Indexed: 11/28/2022] Open
Abstract
Sulfated quercetin derivatives are important authentic standards for metabolic studies. Quercetin-3′-O-sulfate, quercetin-4′-O-sulfate, and quercetin-3-O-sulfate as well as quercetin-di-O-sulfate mixture (quercetin-7,3′-di-O-sulfate, quercetin-7,4′-di-O-sulfate, and quercetin-3′,4′-di-O-sulfate) were synthetized by arylsulfotransferase from Desulfitobacterium hafniense. Purified monosulfates and disulfates were fully characterized using MS and NMR and tested for their 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2′-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS+) and N,N-dimethyl-p-phenylenediamine (DMPD) radical scavenging, Folin-Ciocalteau reduction (FCR), ferric reducing antioxidant power (FRAP), and anti-lipoperoxidant activities in rat liver microsomes damaged by tert-butylhydroperoxide. Although, as expected, the sulfated metabolites were usually less active than quercetin, they remained still effective antiradical and reducing agents. Quercetin-3′-O-sulfate was more efficient than quercetin-4′-O-sulfate in DPPH and FCR assays. In contrast, quercetin-4′-O-sulfate was the best ferric reductant and lipoperoxidation inhibitor. The capacity to scavenge ABTS+• and DMPD was comparable for all substances, except for disulfates, which were the most efficient. Quantum calculations and molecular dynamics simulations on membrane models supported rationalization of free radical scavenging and lipid peroxidation inhibition. These results clearly showed that individual metabolites of food bioactives can markedly differ in their biological activity. Therefore, a systematic and thorough investigation of all bioavailable metabolites with respect to native compounds is needed when evaluating food health benefits.
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Affiliation(s)
- Kateřina Valentová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague, Czech Republic.
| | - Kristýna Káňová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague, Czech Republic.
| | - Florent Di Meo
- INSERM U850, Univ. Limoges, School of Pharmacy, 2 rue du Docteur Marcland, F-87025 Limoges, France.
| | - Helena Pelantová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague, Czech Republic.
| | | | - Lenka Rydlová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague, Czech Republic.
| | - Lucie Petrásková
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague, Czech Republic.
| | - Alena Křenková
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague, Czech Republic.
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nám. 2, CZ-16610 Prague, Czech Republic.
| | - Patrick Trouillas
- INSERM U850, Univ. Limoges, School of Pharmacy, 2 rue du Docteur Marcland, F-87025 Limoges, France.
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University, tř. 17. listopadu 12, CZ-77146 Olomouc, Czech Republic.
| | - Vladimír Křen
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Prague, Czech Republic.
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48
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Rejšek J, Vrkoslav V, Pokorný V, Přibyl V, Cvačka J. Ion Source with Laser Triangulation for Ambient Mass Spectrometry of Nonplanar Samples. Anal Chem 2017; 89:11452-11459. [PMID: 28976183 DOI: 10.1021/acs.analchem.7b02568] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The analysis of nonplanar samples in ambient mass spectrometry poses a formidable challenge. Here, an ion source equipped with laser triangulation for analyzing nonplanar surfaces was constructed. It was designed as a two-position device, where the sample height was measured using laser triangulation and the target compounds were then analyzed. Thanks to a stage movable in xyz, the ion source maintained an optimal vertical distance between the sample and the sampling capillary for each measured spot during the surface analysis. The xyz-coordinates for the movement of the sample stage were computed using the laser sensor data in such a way as to avoid direct contact of the sampling capillary and the measured surface. The ion source performance and its ability to analyze various morphologies were tested using desorption electrospray ionization with plastic objects coated by 2,5-dimethoxybenzoic acid. The experiments showed excellent performance for nonplanar samples but also revealed some limitations especially on object edges and steep slopes. The applicability of the ion source operated in desorption electrospray ionization and desorption atmospheric pressure photoionization was examined for food and pharmaceutical samples. Chemicals on the surface of nonplanar samples were probed along a line extending across the surface of the measured objects. The device provided high-quality spectra, regardless of the sample height at the measured spot. The automatic adjustments of the sample stage in xyz proved to be beneficial for analyzing nonplanar samples and for simultaneous measurement of samples with various dimensions and shapes.
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Affiliation(s)
- Jan Rejšek
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences , Flemingovo nám. 2, Prague 6 CZ-166 10, Czech Republic.,Department of Analytical Chemistry, Faculty of Science, Charles University in Prague , Hlavova 2030/8, Prague 2 CZ-128 43, Czech Republic
| | - Vladimír Vrkoslav
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences , Flemingovo nám. 2, Prague 6 CZ-166 10, Czech Republic
| | - Vít Pokorný
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences , Flemingovo nám. 2, Prague 6 CZ-166 10, Czech Republic
| | - Vladimír Přibyl
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences , Flemingovo nám. 2, Prague 6 CZ-166 10, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences , Flemingovo nám. 2, Prague 6 CZ-166 10, Czech Republic.,Department of Analytical Chemistry, Faculty of Science, Charles University in Prague , Hlavova 2030/8, Prague 2 CZ-128 43, Czech Republic
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49
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Kalužíková A, Vrkoslav V, Harazim E, Hoskovec M, Plavka R, Buděšínský M, Bosáková Z, Cvačka J. Cholesteryl esters of ω-( O-acyl)-hydroxy fatty acids in vernix caseosa. J Lipid Res 2017; 58:1579-1590. [PMID: 28576934 DOI: 10.1194/jlr.m075333] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [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: 01/25/2017] [Revised: 05/22/2017] [Indexed: 11/20/2022] Open
Abstract
Cholesteryl esters of ω-(O-acyl)-hydroxy FAs (Chl-ωOAHFAs) were identified for the first time in vernix caseosa and characterized using chromatography and MS. Chl-ωOAHFAs were isolated using adsorption chromatography on silica gel and magnesium hydroxide. Their general structure was established using high-resolution and tandem MS of intact lipids, and products of their transesterification and derivatizations. Individual molecular species were characterized using nonaqueous reversed-phase HPLC coupled to atmospheric pressure chemical ionization. The analytes were detected as protonated molecules, and their structures were elucidated in the negative ion mode using controlled thermal decomposition and data-dependent fragmentation. About three hundred molecular species of Chl-ωOAHFAs were identified in this way. The most abundant Chl-ωOAHFAs contained 32:1 ω-hydroxy FA (ω-HFA) and 14:0, 15:0, 16:0, 16:1, and 18:1 FAs. The double bond in the 32:1 ω-HFA was in the n-7 and n-9 positions. Chl-ωOAHFAs are estimated to account for approximately 1-2% of vernix caseosa lipids.
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Affiliation(s)
- Aneta Kalužíková
- Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, CZ-128 43 Prague 2, Czech Republic; The Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, CZ-166 10 Prague 6, Czech Republic
| | - Vladimír Vrkoslav
- The Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, CZ-166 10 Prague 6, Czech Republic
| | - Eva Harazim
- Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, CZ-128 43 Prague 2, Czech Republic; The Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, CZ-166 10 Prague 6, Czech Republic
| | - Michal Hoskovec
- The Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, CZ-166 10 Prague 6, Czech Republic
| | - Richard Plavka
- Department of Obstetrics and Gynecology, General Faculty Hospital and First Faculty of Medicine, Charles University in Prague, CZ-128 00 Prague 2, Czech Republic
| | - Miloš Buděšínský
- The Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, CZ-166 10 Prague 6, Czech Republic
| | - Zuzana Bosáková
- Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, CZ-128 43 Prague 2, Czech Republic
| | - Josef Cvačka
- Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, CZ-128 43 Prague 2, Czech Republic; The Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, CZ-166 10 Prague 6, Czech Republic.
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Hanáková Z, Hošek J, Kutil Z, Temml V, Landa P, Vaněk T, Schuster D, Dall'Acqua S, Cvačka J, Polanský O, Šmejkal K. Anti-inflammatory Activity of Natural Geranylated Flavonoids: Cyclooxygenase and Lipoxygenase Inhibitory Properties and Proteomic Analysis. J Nat Prod 2017; 80:999-1006. [PMID: 28322565 DOI: 10.1021/acs.jnatprod.6b01011] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Geranyl flavones have been studied as compounds that potentially can be developed as anti-inflammatory agents. A series of natural geranylated flavanones was isolated from Paulownia tomentosa fruits, and these compounds were studied for their anti-inflammatory activity and possible mechanism of action. Two new compounds were characterized [paulownione C (17) and tomentodiplacone O (20)], and all of the isolated derivatives were assayed for their ability to inhibit cyclooxygenases (COX-1 and COX-2) and 5-lipoxygenase (5-LOX). The compounds tested showed variable degrees of activity, with several of them showing activity comparable to or greater than the standards used in COX-1, COX-2, and 5-LOX assays. However, only the compound tomentodiplacone O (20) showed more selectivity against COX-2 versus COX-1 when compared with ibuprofen. The ability of the test compounds to interact with the above-mentioned enzymes was supported by docking studies, which revealed the possible incorporation of selected test substances into the active sites of these enzymes. Furthermore, one of the COX/LOX dual inhibitors, diplacone (14) (a major geranylated flavanone of P. tomentosa), was studied in vitro to obtain a proteomic overview of its effect on inflammation in LPS-treated THP-1 macrophages, supporting its previously observed anti-inflammatory activity and revealing the mechanism of its anti-inflammatory effect.
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Affiliation(s)
| | | | - Zsófia Kutil
- Laboratory of Plant Biotechnologies, Institute of Experimental Botany, The Czech Academy of Sciences , 16502 Prague, Czech Republic
| | | | - Přemysl Landa
- Laboratory of Plant Biotechnologies, Institute of Experimental Botany, The Czech Academy of Sciences , 16502 Prague, Czech Republic
| | - Tomáš Vaněk
- Laboratory of Plant Biotechnologies, Institute of Experimental Botany, The Czech Academy of Sciences , 16502 Prague, Czech Republic
| | | | - Stefano Dall'Acqua
- Department of Pharmaceutical and Pharmacological Sciences, University of Padua , 35131 Padua, Italy
| | - Josef Cvačka
- Mass Spectrometry Group, Institute of Organic Chemistry and Biochemistry, The Czech Academy of Sciences , CZ-16610 Prague, Czech Republic
| | - Ondřej Polanský
- Veterinary Research Institute , CZ-62100 Brno, Czech Republic
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