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Schrader T, Kubik S, Braun M. Günter Wulff (1935 -2023): Father of Molecular Imprinting. Angew Chem Int Ed Engl 2024; 63:e202402244. [PMID: 38372496 DOI: 10.1002/anie.202402244] [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: 02/20/2024]
Abstract
Günter Wulff, internationally well known for his invention of Molecular Imprinting, passed away on December 11, 2023 in Erkrath-Hochdahl, Germany, not far from the University of Düsseldorf, where he made his greatest discoveries. A passionate researcher and deep conceptual thinker, he greatly advanced our understanding of polymer chemistry.
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Affiliation(s)
- Thomas Schrader
- Fakultät für Chemie, Universität Duisburg-Essen, Universitätsstr. 7, 45117, Essen, Germany
| | - Stefan Kubik
- Fachbereich Chemie, Rheinland-Pfälzische Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße, 67663, Kaiserslautern, Germany
| | - Manfred Braun
- Fachbereich Chemie, Universität Düsseldorf, Universitätsstr. 1, 40225, Düsseldorf, Germany
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Kubik S. Synthetic Receptors Based on Abiotic Cyclo(pseudo)peptides. Molecules 2022; 27:molecules27092821. [PMID: 35566168 PMCID: PMC9103335 DOI: 10.3390/molecules27092821] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 04/26/2022] [Accepted: 04/27/2022] [Indexed: 11/17/2022]
Abstract
Work on the use of cyclic peptides or pseudopeptides as synthetic receptors started even before the field of supramolecular chemistry was firmly established. Research initially focused on the development of synthetic ionophores and involved the use of macrocycles with a repeating sequence of subunits along the ring to facilitate the correlation between structure, conformation, and binding properties. Later, nonnatural amino acids as building blocks were also considered. With growing research in this area, cyclopeptides and related macrocycles developed into an important and structurally diverse receptor family. This review provides an overview of these developments, starting from the early years. The presented systems are classified according to characteristic structural elements present along the ring. Wherever possible, structural aspects are correlated with binding properties to illustrate how natural or nonnatural amino acids affect binding properties.
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Affiliation(s)
- Stefan Kubik
- Fachbereich Chemie-Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. 54, 67663 Kaiserslautern, Germany
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Kubik S. When Molecules Meet in Water-Recent Contributions of Supramolecular Chemistry to the Understanding of Molecular Recognition Processes in Water. Chemistry 2022; 11:e202200028. [PMID: 35373466 PMCID: PMC8977507 DOI: 10.1002/open.202200028] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 03/17/2022] [Indexed: 12/19/2022]
Abstract
Molecular recognition processes in water differ from those in organic solvents in that they are mediated to a much greater extent by solvent effects. The hydrophobic effect, for example, causes molecules that only weakly interact in organic solvents to stay together in water. Such water‐mediated interactions can be very efficient as demonstrated by many of the synthetic receptors discussed in this review, some of which have substrate affinities matching or even surpassing those of natural binders. However, in spite of considerable success in designing such receptors, not all factors determining their binding properties in water are fully understood. Existing concepts still provide plausible explanations why the reorganization of water molecules often causes receptor‐substrate interactions in water to be strongly exothermic rather than entropically favored as predicted by the classical view of the hydrophobic effect.
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Affiliation(s)
- Stefan Kubik
- Technische Universität Kaiserslautern, Fachbereich Chemie - Organische Chemie, Erwin-Schrödinger-Straße 54, 67663, Kaiserslautern, Germany
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Bartl J, Reinke L, Koch M, Kubik S. Selective sensing of sulfate anions in water with cyclopeptide-decorated gold nanoparticles. Chem Commun (Camb) 2021; 56:10457-10460. [PMID: 32856639 DOI: 10.1039/d0cc04796a] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The interaction of cyclopeptides bound to the surface of mixed monolayer-protected gold nanoparticles with sulfate anions causes the crosslinking and concomitant precipitation of the nanoparticles from aqueous solutions even in presence of an excess of competing anions, thus allowing the naked eye detection of sulfate in water.
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Affiliation(s)
- Julia Bartl
- Technische Universität Kaiserslautern, Fachbereich Chemie - Organische Chemie, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany.
| | - Lena Reinke
- Technische Universität Kaiserslautern, Fachbereich Chemie - Organische Chemie, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany.
| | - Marcus Koch
- INM - Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany
| | - Stefan Kubik
- Technische Universität Kaiserslautern, Fachbereich Chemie - Organische Chemie, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany.
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Reinke L, Koch M, Müller-Renno C, Kubik S. Selective sensing of adenosine monophosphate (AMP) over adenosine diphosphate (ADP), adenosine triphosphate (ATP), and inorganic phosphates with zinc(II)-dipicolylamine-containing gold nanoparticles. Org Biomol Chem 2021; 19:3893-3900. [PMID: 33949587 DOI: 10.1039/d1ob00341k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Mixed monolayer-protected gold nanoparticles containing surface-bound triethylene glycol and dipicolylamine groups aggregated in water/methanol, 1 : 2 (v/v) in the presence of nucleotides, if the solution also contained zinc(ii) nitrate to convert the dipicolylamine units into the corresponding zinc complexes. Nanoparticle aggregation could be followed with the naked eye by the colour change of the solution from red to purple followed by nanoparticle precipitation. The sensitivity was highest for adenosine triphosphate (ATP), which could be detected at concentrations >10 μM, and decreased over adenosine diphosphate (ADP) to adenosine monophosphate (AMP), consistent with the typically higher affinity of zinc(ii)-dipicolylamine-derived receptors for higher charged nucleotides. Inorganic sodium diphosphate and triphosphate interfered in the assay by also inducing nanoparticle aggregation. However, while the nucleotide-induced aggregates persisted even at higher analyte concentrations, the nanoparticles that were precipitated with inorganic salts redissolved again when the salt concentration was increased. The thus resulting solutions retained their ability to respond to nucleotides, but they now preferentially responded to AMP. Accordingly, AMP could be sensed selectively at concentrations ≥50 μM in an aqueous environment, even in the presence of other nucleotides and inorganic anions. This work thus introduces a novel approach for the sensing of a nucleotide that is often the most difficult analyte to detect with other assays.
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Affiliation(s)
- Lena Reinke
- Technische Universität Kaiserslautern, Fachbereich Chemie - Organische Chemie, Erwin-Schrödinger-Straße 54, 67663 Kaiserslautern, Germany.
| | - Marcus Koch
- INM - Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany
| | - Christine Müller-Renno
- Technische Universität Kaiserslautern, Fachbereich Physik und Forschungszentrum OPTIMAS, AG Grenzflächen, Nanomaterialien und Biophysik, Erwin-Schrödinger-Straße 56, 67663 Kaiserslautern, Germany
| | - Stefan Kubik
- Technische Universität Kaiserslautern, Fachbereich Chemie - Organische Chemie, Erwin-Schrödinger-Straße 54, 67663 Kaiserslautern, Germany.
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Reinke L, Bartl J, Koch M, Kubik S. Optical detection of di- and triphosphate anions with mixed monolayer-protected gold nanoparticles containing zinc(II)-dipicolylamine complexes. Beilstein J Org Chem 2020; 16:2687-2700. [PMID: 33178359 PMCID: PMC7607427 DOI: 10.3762/bjoc.16.219] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 10/22/2020] [Indexed: 01/02/2023] Open
Abstract
Gold nanoparticles covered with a mixture of ligands of which one type contains solubilizing triethylene glycol residues and the other peripheral zinc(II)–dipicolylamine (DPA) complexes allowed the optical detection of hydrogenphosphate, diphosphate, and triphosphate anions in water/methanol 1:2 (v/v). These anions caused the bright red solutions of the nanoparticles to change their color because of nanoparticle aggregation followed by precipitation, whereas halides or oxoanions such as sulfate, nitrate, or carbonate produced no effect. The sensitivity of phosphate sensing depended on the nature of the anion, with diphosphate and triphosphate inducing visual changes at significantly lower concentrations than hydrogenphosphate. In addition, the sensing sensitivity was also affected by the ratio of the ligands on the nanoparticle surface, decreasing as the number of immobilized zinc(II)–dipicolylamine groups increased. A nanoparticle containing a 9:1 ratio of the solubilizing and the anion-binding ligand showed a color change at diphosphate and triphosphate concentrations as low as 10 μmol/L, for example, and precipitated at slightly higher concentrations. Hydrogenphosphate induced a nanoparticle precipitation only at a concentration of ca. 400 μmol/L, at which the precipitates formed in the presence of diphosphates and triphosphates redissolved. A nanoparticle containing fewer binding sites was more sensitive, while increasing the relative number of zinc(II)–dipicolylamine complexes beyond 25% had a negative impact on the limit of detection and the optical response. Transmission electron microscopy provided evidence that the changes of the nanoparticle properties observed in the presence of the phosphates were due to a nanoparticle crosslinking, consistent with the preferred binding mode of zinc(II)–dipicolylamine complexes with phosphate anions which involves binding of the anion between two metal centers. This work thus provided information on how the behavior of mixed monolayer-protected gold nanoparticles is affected by multivalent interactions, at the same time introducing a method to assess whether certain biologically relevant anions are present in an aqueous solution within a specific concentration range.
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Affiliation(s)
- Lena Reinke
- Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
| | - Julia Bartl
- Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
| | - Marcus Koch
- INM - Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany
| | - Stefan Kubik
- Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
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Andrae B, Bauer D, Gaß P, Koller M, Worek F, Kubik S. Influence of cyclic and acyclic cucurbiturils on the degradation pathways of the chemical warfare agent VX. Org Biomol Chem 2020; 18:5218-5227. [PMID: 32602497 DOI: 10.1039/d0ob01167c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The highly toxic nerve agent VX is a methylphosphonothioate that degrades via three pathways in aqueous solution, namely through the hydrolysis of the P-O or P-S bonds, or the cleavage of the C-S bond at the 2-aminoethyl residue. In the latter case, an aziridinium ion and a phosphonothioate is formed. Here it is shown that acyclic or cyclic cucurbiturils inhibit these reactions in phosphate buffer at physiological pH and thus stabilise the nerve agent. When using unbuffered basic solutions as the reaction medium, however, in which the P-S or P-O bonds are normally hydrolysed preferentially, cucurbiturils turned out to strongly shift VX degradation towards the cleavage of the C-S bond. Cucurbit[7]uril, in particular, has a so pronounced effect under suitable conditions that it almost completely suppresses the formation of products resulting from the other degradation pathways. Investigations involving VX analogues in combination with computational methods suggest that one reason for the reaction control exerted by the cucurbiturils is the preorganisation of VX for aziridinium ion formation. In addition, cucurbit[7]uril also lowers the transition state of the reaction by stabilising the positive charge developing on the way to the product. Cucurbiturils thus have a marked effect on the reactivity of a highly toxic nerve agent, which potentially allows using them for decontamination purposes.
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Affiliation(s)
- Beatrice Andrae
- Technische Universität Kaiserslautern, Fachbereich Chemie - Organische Chemie, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany.
| | - Daniel Bauer
- Technische Universität Kaiserslautern, Fachbereich Chemie - Organische Chemie, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany.
| | - Patrick Gaß
- Technische Universität Kaiserslautern, Fachbereich Chemie - Organische Chemie, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany.
| | - Marianne Koller
- Institut für Pharmakologie und Toxikologie der Bundeswehr, Neuherbergstraße 11, 80937 München, Germany
| | - Franz Worek
- Institut für Pharmakologie und Toxikologie der Bundeswehr, Neuherbergstraße 11, 80937 München, Germany
| | - Stefan Kubik
- Technische Universität Kaiserslautern, Fachbereich Chemie - Organische Chemie, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany.
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Bartl J, Kubik S. Anion Binding of a Cyclopeptide-Derived Molecular Cage in Aqueous Solvent Mixtures. Chempluschem 2020; 85:963-969. [PMID: 32406613 DOI: 10.1002/cplu.202000255] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 05/05/2020] [Indexed: 11/06/2022]
Abstract
A molecular cage consisting of two cyclic hexapeptides with an alternating sequence of (2S,4S)-4-aminoproline and 6-aminopicolinic acid subunits, covalently linked via three diglycolic acid subunits, interacts with a variety of inorganic anions in acetonitrile/water. In the respective complexes, the anion resides in a cavity between the two cyclopeptide rings where it interacts with six converging NH groups. The cage binds sulfate anions in acetonitrile/water, 2 : 1 (v/v) with a log Ka of 6.7, ca. 2.5 orders of magnitude stronger than an analogous bis(cyclopeptide) with only one linker whose sulfate affinity log Ka amounts to 4.3. The preorganization induced by the three linking units is thus beneficial for sulfate binding. In addition, these linkers cause the dissociation of the sulfate complex to have a substantial Gibbs free energy of activation ΔG≠ of 68.9 kJ mol-1 and they also seem to affect anion selectivity as illustrated by the different effects some anions produce on the 1 H NMR spectra of the triply and singly-linked bis(cyclopeptides). Such anion binding cages represent promising scaffolds to mimic natural anion receptors such as the sulfate-binding protein.
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Affiliation(s)
- Julia Bartl
- Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße, 67663, Kaiserslautern, Germany
| | - Stefan Kubik
- Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße, 67663, Kaiserslautern, Germany
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Prabodh A, Bauer D, Kubik S, Rebmann P, Klärner FG, Schrader T, Delarue Bizzini L, Mayor M, Biedermann F. Chirality sensing of terpenes, steroids, amino acids, peptides and drugs with acyclic cucurbit[n]urils and molecular tweezers. Chem Commun (Camb) 2020; 56:4652-4655. [PMID: 32253396 DOI: 10.1039/d0cc00707b] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [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
Achiral chromophoric hosts, i.e. acyclic cucurbit[n]urils and molecular tweezers, were found to respond with characteristic Circular Dichroism (CD) spectra to the presence of micromolar concentrations of chiral hydrocarbons, terpenes, steroids, amino acids and their derivates, and drugs in water. In favourable cases, this allows for analyte identification or for reaction monitoring.
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Affiliation(s)
- Amrutha Prabodh
- Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology (INT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
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Mesquita LM, Anhäuser J, Bellaire D, Becker S, Lützen A, Kubik S. Palladium(II)-Mediated Assembly of a M2L2 Macrocycle and M3L6 Cage from a Cyclopeptide-Derived Ligand. Org Lett 2019; 21:6442-6446. [DOI: 10.1021/acs.orglett.9b02338] [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: 12/23/2022]
Affiliation(s)
- Lígia M. Mesquita
- Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
| | - Jana Anhäuser
- Kekulé-Institut für Organische Chemie und Biochemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Straße 1, 53121 Bonn, Germany
| | - Daniel Bellaire
- Fachbereich Maschinenbau und Verfahrenstechnik - Lehrstuhl für Thermodynamik, Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
| | - Sabine Becker
- Fachbereich Chemie - Anorganische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
| | - Arne Lützen
- Kekulé-Institut für Organische Chemie und Biochemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Straße 1, 53121 Bonn, Germany
| | - Stefan Kubik
- Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
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Abstract
Functionalised acyclic cucurbiturils can be prepared in a straightforward fashion and provide access to a wide variety of substituted derivatives.
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Affiliation(s)
- Daniel Bauer
- Technische Universität Kaiserslautern
- Fachbereich Chemie - Organische Chemie
- 67663 Kaiserslautern
- Germany
| | - Beatrice Andrae
- Technische Universität Kaiserslautern
- Fachbereich Chemie - Organische Chemie
- 67663 Kaiserslautern
- Germany
| | - Patrick Gaß
- Technische Universität Kaiserslautern
- Fachbereich Chemie - Organische Chemie
- 67663 Kaiserslautern
- Germany
| | - Danjano Trenz
- Organic Chemistry II
- Saarland University
- 66123 Saarbrücken
- Germany
| | - Sabine Becker
- Technische Universität Kaiserslautern
- Fachbereich Chemie - Anorganische Chemie
- 67663 Kaiserslautern
- Germany
| | - Stefan Kubik
- Technische Universität Kaiserslautern
- Fachbereich Chemie - Organische Chemie
- 67663 Kaiserslautern
- Germany
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Bauer D, Andrae B, Gaß P, Trenz D, Becker S, Kubik S. Correction: Functionalisable acyclic cucurbiturils. Org Chem Front 2019. [DOI: 10.1039/c9qo90027f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Correction for ‘Functionalisable acyclic cucurbiturils’ by Daniel Bauer et al., Org. Chem. Front., 2019, DOI: 10.1039/C9QO00156E.
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Affiliation(s)
- Daniel Bauer
- Technische Universität Kaiserslautern
- Fachbereich Chemie – Organische Chemie
- Erwin-Schrödinger-Straße
- 67663 Kaiserslautern
- Germany
| | - Beatrice Andrae
- Technische Universität Kaiserslautern
- Fachbereich Chemie – Organische Chemie
- Erwin-Schrödinger-Straße
- 67663 Kaiserslautern
- Germany
| | - Patrick Gaß
- Technische Universität Kaiserslautern
- Fachbereich Chemie – Organische Chemie
- Erwin-Schrödinger-Straße
- 67663 Kaiserslautern
- Germany
| | - Danjano Trenz
- Organic Chemistry II
- Saarland University
- 66123 Saarbrücken
- Germany
| | - Sabine Becker
- Technische Universität Kaiserslautern
- Fachbereich Chemie – Anorganische Chemie
- 67663 Kaiserslautern
- Germany
| | - Stefan Kubik
- Technische Universität Kaiserslautern
- Fachbereich Chemie – Organische Chemie
- Erwin-Schrödinger-Straße
- 67663 Kaiserslautern
- Germany
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Kubik S, Thude S, Athanasiadis A, Sechtem U, Ong PE. P768Expansion of CD4+CD28null T-lymphocytes in patients with epicardial coronary spasm - A potential novel pathogenetic pathway. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy564.p768] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- S Kubik
- Vivantes Klinikum im Friedrichshain, Cardiology, Berlin, Germany
| | - S Thude
- Fraunhofer, Institut für Grenzflächen- und Bioverfahrenstechnik, Stuttgart, Germany
| | | | - U Sechtem
- Robert Bosch Hospital, Stuttgart, Germany
| | - P E Ong
- Robert Bosch Hospital, Stuttgart, Germany
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Abstract
Anion receptors often rely on coordinative or multiple ionic interactions to be active in water. In the absence of such strong interactions, anion binding in water can also be efficient, however, as demonstrated by a number of anion receptors developed in recent years. The cyclopeptide-derived receptors comprising an alternating sequence of l-proline and 6-aminopicolinic acid subunits are an example. These cyclopeptides are neutral and, at first sight, can only engage in hydrogen-bond formation with an anionic substrate. Nevertheless, they even interact with strongly solvated sulfate anions in water. The intrinsic anion affinity of these cyclopeptides can be related to structural aspects of their highly preorganized concave binding site, which comprises a wall of hydrophobic proline units arranged around the peptide NH groups at the cavity base. When anions are incorporated into this cavity they can engage in hydrogen-bonding interactions to the NH groups, and complex formation also benefits from cavity dehydration. Formation of 1:1 complexes, in which an anion binds to a single cyclopeptide ring, is associated with only small stability constants, however, whereas significantly more stable complexes are formed if the anion is buried between two cyclopeptide molecules. A major contribution to the formation of these sandwich complexes derives from the addition of the second ring to the initially formed 1:1 cyclopeptide-anion complex. This step brings the apolar proline residues of both cyclopeptides in close proximity, which causes the resulting structure to be stabilized to a large extent by hydrophobic effects. Solvent dependent binding studies provided an estimate to which degree these solvent effects contribute to the overall complex stability. In these studies, bis(cyclopeptides) were used, featuring two cyclopeptide rings covalently connected via linkers that enable both rings to simultaneously interact with the anion. Bis(cyclopeptides) with additional solubilizing groups allowed binding studies in a wide range of solvents, including in water. The systematic analysis of the solvent dependence of anion affinity yielded a quantitative correlation between complex stability and parameters relating to the solvation of the anions and solvent properties, confirming that solvent effects contribute to anion binding. Interestingly, the thermodynamic signature of complex formation in water mirrors that of sulfate binding to a protein complex but is opposite to that of other recently described anion receptors, which also do not engage in ionic or coordinative interactions with the substrate. These receptors not only differ in terms of the thermodynamics of binding from the cyclopeptides but also possess a characteristically different anion selectivity in that they prefer to bind weakly coordinating anions but fail to bind sulfate. Solvent effects likely control the anion binding of both receptors types but their impact on complex formation and anion selectivity seems to be profoundly different. Future work in the area of anion coordination chemistry will benefit from the deeper understanding of these effects and how they can be controlled.
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Affiliation(s)
- Stefan Kubik
- Fachbereich Chemie – Organische
Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
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Affiliation(s)
- Stefan Kubik
- Fachbereich Chemie - Organische Chemie; Technische Universität Kaiserslautern; Erwin-Schrödinger-Straße D-67663 Kaiserslautern Germany
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Mungalpara D, Valkonen A, Rissanen K, Kubik S. Efficient stabilisation of a dihydrogenphosphate tetramer and a dihydrogenpyrophosphate dimer by a cyclic pseudopeptide containing 1,4-disubstituted 1,2,3-triazole moieties. Chem Sci 2017; 8:6005-6013. [PMID: 28989630 PMCID: PMC5621005 DOI: 10.1039/c7sc02700a] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [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: 06/16/2017] [Accepted: 07/12/2017] [Indexed: 12/26/2022] Open
Abstract
A cyclic pseudooctapeptide 2 is described containing 1,4-disubstituted 1,2,3-triazole moieties. This compound features eight converging hydrogen bond donors along the ring, namely four amide NH and four triazole CH groups, which enable 2 to engage in interactions with anions. While fully deprotonated sulfate anions exhibit only moderate affinity for 2, protonated anions such as dihydrogenpyrophosphate and dihydrogenphosphate anions are strongly bound. Complexation of the phosphate-derived anions involves sandwiching of a dihydrogenpyrophosphate dimer or a dihydrogenphosphate tetramer between two pseudopeptide rings. X-ray crystallography provided structural information, while 1H NMR spectroscopy, mass spectrometry, and isothermal titration calorimetry demonstrated that these complexes are stable in solution (2.5 vol% water/DMSO) and can even be transferred without decomposition into the gas phase. The observed high thermodynamic stabilities are attributed to the mutual reinforcement of the interactions between the individual complex components, namely, hydrogen-bonding between the anions, multiple hydrogen bonding interactions between the anion aggregates and the triazole CH and NH hydrogen bond donors of 2, and potential dispersive interactions between the closely arranged pseudopeptide rings. Pseudopeptide 2 thus represents a promising lead for the construction of phosphate receptors, whose binding selectivity makes use of the unique ability of certain anions to assemble into higher aggregates.
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Affiliation(s)
- Disha Mungalpara
- Technische Universität Kaiserslautern , Fachbereich Chemie - Organische Chemie , Erwin-Schrödinger-Straße , 67663 Kaiserslautern , Germany .
| | - Arto Valkonen
- University of Jyvaskyla , Department of Chemistry , Nanoscience Center , P.O. Box 35 , Jyväskylä FI-40014 , Finland
| | - Kari Rissanen
- University of Jyvaskyla , Department of Chemistry , Nanoscience Center , P.O. Box 35 , Jyväskylä FI-40014 , Finland
| | - Stefan Kubik
- Technische Universität Kaiserslautern , Fachbereich Chemie - Organische Chemie , Erwin-Schrödinger-Straße , 67663 Kaiserslautern , Germany .
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Sommer F, Marcus Y, Kubik S. Effects of Solvent Properties on the Anion Binding of Neutral Water-Soluble Bis(cyclopeptides) in Water and Aqueous Solvent Mixtures. ACS Omega 2017; 2:3669-3680. [PMID: 31457681 PMCID: PMC6641638 DOI: 10.1021/acsomega.7b00867] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 07/03/2017] [Indexed: 05/31/2023]
Abstract
In this study, the anion-binding bis(cyclopeptide) 2 is introduced, which dissolves freely in water, affording up to 10 mM concentrations, thanks to triethylene glycol-derived substituents in the cyclopeptide subunits and the linker connecting them. Binding studies provided evidence that the anion affinity previously demonstrated for less-soluble analogs of this compound is retained under highly competitive aqueous conditions. The highest affinity in water was observed for iodide, closely followed by sulfate anions, whereas binding of soft and weakly coordinating anions could not be observed. The anion selectivity of 2 thus differs from that of other recently described receptors, which also do not require electrostatic or coordinative interactions for anion binding in water but typically fail to bind strongly coordinating sulfate anions. The ability of 2 to overcome sulfate hydration is attributed to the special mode of binding, combining direct N-H···A- interactions with the release of water molecules from the receptor cavity. The characterization of the anion binding of 2 and a related bis(cyclopeptide) in a variety of different solvents and aqueous solvent mixtures furthermore allowed the correlation of the binding properties with solvent parameters. These analyses provided qualitative and even quantitative insights into the solvent properties and solvation phenomena that mainly affect anion complexation.
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Affiliation(s)
- Fabian Sommer
- Fachbereich
Chemie—Organische Chemie, Technische
Universität Kaiserslautern, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
| | - Yizhak Marcus
- Institute
of Chemistry, The Hebrew University, Edmund Safra Campus, Givat Ram, Jerusalem 91904, Israel
| | - Stefan Kubik
- Fachbereich
Chemie—Organische Chemie, Technische
Universität Kaiserslautern, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
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20
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Mungalpara D, Stegmüller S, Kubik S. A neutral halogen bonding macrocyclic anion receptor based on a pseudocyclopeptide with three 5-iodo-1,2,3-triazole subunits. Chem Commun (Camb) 2017; 53:5095-5098. [DOI: 10.1039/c7cc02424j] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The converging arrangement of iodine atoms along a confined cavity causes a cyclic pseudopeptide with three 5-iodo-1,2,3-triazole subunits to interact with halides, in particular with chloride, in 2.5 vol% water/DMSO.
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Affiliation(s)
- Disha Mungalpara
- Technische Universität Kaiserslautern, Fachbereich Chemie – Organische Chemie, Erwin-Schrödinger-Straße
- Kaiserslautern
- Germany
| | - Simone Stegmüller
- Technische Universität Kaiserslautern, Fachbereich Chemie – Lebensmittelchemie & Toxikologie, Erwin-Schrödinger-Straße
- Kaiserslautern
- Germany
| | - Stefan Kubik
- Technische Universität Kaiserslautern, Fachbereich Chemie – Organische Chemie, Erwin-Schrödinger-Straße
- Kaiserslautern
- Germany
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21
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Stamm A, Maué D, Schaly A, Schlicher S, Bartl J, Kubik S, Gerhards M. Structural analyses of isolated cyclic tetrapeptides with varying amino acid residues. Phys Chem Chem Phys 2017; 19:10718-10726. [DOI: 10.1039/c6cp08696a] [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: 12/18/2022]
Abstract
Structural analyses of isolated cyclic tetrapeptides with varying amino acid residues were performed by applying combined IR/UV spectroscopy in the molecular beam and DFT calculations. The intrinsic structural properties especially with regard to the influence of different amino acid residues are fundamental for optimizing their binding ability.
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Affiliation(s)
- A. Stamm
- TU Kaiserslautern
- Fachbereich Chemie & Research Center Optimas
- Physikalische Chemie
- D-67663 Kaiserslautern
- Germany
| | - D. Maué
- TU Kaiserslautern
- Fachbereich Chemie & Research Center Optimas
- Physikalische Chemie
- D-67663 Kaiserslautern
- Germany
| | - A. Schaly
- TU Kaiserslautern
- Fachbereich Chemie
- Organische Chemie
- D-67663 Kaiserslautern
- Germany
| | - S. Schlicher
- TU Kaiserslautern
- Fachbereich Chemie
- Organische Chemie
- D-67663 Kaiserslautern
- Germany
| | - J. Bartl
- TU Kaiserslautern
- Fachbereich Chemie
- Organische Chemie
- D-67663 Kaiserslautern
- Germany
| | - S. Kubik
- TU Kaiserslautern
- Fachbereich Chemie
- Organische Chemie
- D-67663 Kaiserslautern
- Germany
| | - M. Gerhards
- TU Kaiserslautern
- Fachbereich Chemie & Research Center Optimas
- Physikalische Chemie
- D-67663 Kaiserslautern
- Germany
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22
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Mungalpara D, Kelm H, Valkonen A, Rissanen K, Keller S, Kubik S. Oxoanion binding to a cyclic pseudopeptide containing 1,4-disubstituted 1,2,3-triazole moieties. Org Biomol Chem 2017; 15:102-113. [DOI: 10.1039/c6ob02172g] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The converging arrangement of hydrogen bond donors from amide NH and 1,2,3-triazole CH groups enables the described cyclic pseudopeptide to interact with oxoanions in water/DMSO mixtures.
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Affiliation(s)
- Disha Mungalpara
- Technische Universität Kaiserslautern
- Fachbereich Chemie – Organische Chemie
- 67663 Kaiserslautern
- Germany
| | - Harald Kelm
- Technische Universität Kaiserslautern
- Fachbereich Chemie – Anorganische Chemie
- 67663 Kaiserslautern
- Germany
| | - Arto Valkonen
- University of Jyvaskyla
- Department of Chemistry
- Nanoscience Center
- Jyvaskyla FI-40014
- Finland
| | - Kari Rissanen
- University of Jyvaskyla
- Department of Chemistry
- Nanoscience Center
- Jyvaskyla FI-40014
- Finland
| | - Sandro Keller
- University of Kaiserslautern
- Molecular Biophysics
- 67663 Kaiserslautern
- Germany
| | - Stefan Kubik
- Technische Universität Kaiserslautern
- Fachbereich Chemie – Organische Chemie
- 67663 Kaiserslautern
- Germany
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23
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Clarke HJ, Howe ENW, Wu X, Sommer F, Yano M, Light ME, Kubik S, Gale PA. Transmembrane Fluoride Transport: Direct Measurement and Selectivity Studies. J Am Chem Soc 2016; 138:16515-16522. [PMID: 27998094 DOI: 10.1021/jacs.6b10694] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [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
Fluoride has been overlooked as a target in the development of synthetic anion transporters despite natural fluoride transport channels being recently discovered. In this paper we report the direct measurement of fluoride transport across lipid bilayers facilitated by a series of strapped calix[4]pyrroles and show that these compounds facilitate transport via an electrogenic mechanism (determined using valinomycin and monensin coupled transport assays and an additional osmotic response assay). An HPTS transport assay was used to quantify this electrogenic process and assess the interference of naturally occurring fatty acids with the transport process and Cl- over H+/OH- transport selectivity.
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Affiliation(s)
- Harriet J Clarke
- Chemistry, University of Southampton , Southampton SO17 1BJ, U.K
| | - Ethan N W Howe
- Chemistry, University of Southampton , Southampton SO17 1BJ, U.K
| | - Xin Wu
- Chemistry, University of Southampton , Southampton SO17 1BJ, U.K
| | - Fabian Sommer
- Department of Chemistry-Organic Chemistry, Kaiserslautern University of Technology , Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
| | - Masafumi Yano
- Chemistry, University of Southampton , Southampton SO17 1BJ, U.K
| | - Mark E Light
- Chemistry, University of Southampton , Southampton SO17 1BJ, U.K
| | - Stefan Kubik
- Department of Chemistry-Organic Chemistry, Kaiserslautern University of Technology , Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
| | - Philip A Gale
- Chemistry, University of Southampton , Southampton SO17 1BJ, U.K
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24
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Banfai P, Karczag A, Kubik S, Lüers P, Sürth W, Banfai S. Extracochlear Eight- and 16-Channel Cochlear Implants with Percutaneous and Transcutaneous Transmission: Experiences with 129 Patients. Ann Otol Rhinol Laryngol 2016. [DOI: 10.1177/00034894870960s163] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The Cologne-Düren research group has developed a multichannel extracochlear method of implantation and has carried out 129 operations as of June 1985. To simulate the basic physiologic principles of the inner ear, we also used the place and periodicity principle. Experience so far has shown that the electrical stimulus pattern is perceived as an auditory sensation by the bony wall of the middle ear, and that even a certain selectivity can be achieved. All 129 patients have attained acoustic contact with the environment. They can largely differentiate environmental noises and distinguish human voices from each other. Their lipreading is substantially improved with the support of the speech processor. Moreover, pronunciation becomes very much more distinct in the congenitally deaf. Apart from these average results, signs of development of open speech were observed in 11% of the patients.
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25
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Bierwisch A, Koller M, Worek F, Kubik S. Front Cover: Pathways for the Reactions Between Neurotoxic Organophosphorus Compounds and Oximes or Hydroxamic Acids (Eur. J. Org. Chem. 35/2016). European J Org Chem 2016. [DOI: 10.1002/ejoc.201670351] [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: 11/07/2022]
Affiliation(s)
- Anne Bierwisch
- Institut für Pharmakologie und Toxikologie der Bundeswehr; Neuherbergstraße 11 80937 München Germany
| | - Marianne Koller
- Institut für Pharmakologie und Toxikologie der Bundeswehr; Neuherbergstraße 11 80937 München Germany
| | - Franz Worek
- Institut für Pharmakologie und Toxikologie der Bundeswehr; Neuherbergstraße 11 80937 München Germany
| | - Stefan Kubik
- Fachbereich Chemie Organische Chemie; Technische Universität Kaiserslautern; Erwin-Schrödinger-Straße 67663 Kaiserslautern Germany
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26
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Bierwisch A, Koller M, Worek F, Kubik S. Pathways for the Reactions Between Neurotoxic Organophosphorus Compounds and Oximes or Hydroxamic Acids. European J Org Chem 2016. [DOI: 10.1002/ejoc.201601053] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Anne Bierwisch
- Institut für Pharmakologie und Toxikologie der Bundeswehr; Neuherbergstraße 11 80937 München Germany
| | - Marianne Koller
- Institut für Pharmakologie und Toxikologie der Bundeswehr; Neuherbergstraße 11 80937 München Germany
| | - Franz Worek
- Institut für Pharmakologie und Toxikologie der Bundeswehr; Neuherbergstraße 11 80937 München Germany
| | - Stefan Kubik
- Fachbereich Chemie Organische Chemie; Technische Universität Kaiserslautern; Erwin-Schrödinger-Straße 67663 Kaiserslautern Germany
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27
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Schneider C, Bierwisch A, Koller M, Worek F, Kubik S. Entgiftung von VX und anderen V-Stoffen in Wasser bei 37 °C und pH 7.4 durch substituierte Sulfonatocalix[4]arene. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201606881] [Citation(s) in RCA: 5] [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: 12/15/2022]
Affiliation(s)
- Christian Schneider
- Fachbereich Chemie - Organische Chemie; Technische Universität Kaiserslautern; Erwin-Schrödinger-Straße 67663 Kaiserslautern Deutschland
| | - Anne Bierwisch
- Institut für Pharmakologie und Toxikologie der Bundeswehr; Neuherbergstraße 11 80937 München Deutschland
| | - Marianne Koller
- Institut für Pharmakologie und Toxikologie der Bundeswehr; Neuherbergstraße 11 80937 München Deutschland
| | - Franz Worek
- Institut für Pharmakologie und Toxikologie der Bundeswehr; Neuherbergstraße 11 80937 München Deutschland
| | - Stefan Kubik
- Fachbereich Chemie - Organische Chemie; Technische Universität Kaiserslautern; Erwin-Schrödinger-Straße 67663 Kaiserslautern Deutschland
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28
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Schneider C, Bierwisch A, Koller M, Worek F, Kubik S. Detoxification of VX and Other V-Type Nerve Agents in Water at 37 °C and pH 7.4 by Substituted Sulfonatocalix[4]arenes. Angew Chem Int Ed Engl 2016; 55:12668-72. [PMID: 27627873 PMCID: PMC5113771 DOI: 10.1002/anie.201606881] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Indexed: 02/02/2023]
Abstract
Sulfonatocalix[4]arenes with an appended hydroxamic acid residue can detoxify VX and related V‐type neurotoxic organophosphonates with half‐lives down to 3 min in aqueous buffer at 37 °C and pH 7.4. The detoxification activity is attributed to the millimolar affinity of the calixarene moiety for the positively charged organophosphonates in combination with the correct arrangement of the hydroxamic acid group. The reaction involves phosphonylation of the hydroxamic acid followed by a Lossen rearrangement, thus rendering the mode of action stoichiometric rather than catalytic. Nevertheless, these calixarenes are currently the most efficient low‐molecular‐weight compounds for detoxifying persistent V‐type nerve agents under mild conditions. They thus represent lead structures for novel antidotes that allow treatment of poisonings by these highly toxic chemicals.
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Affiliation(s)
- Christian Schneider
- Fachbereich Chemie-Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Strasse, 67663, Kaiserslautern, Germany
| | - Anne Bierwisch
- Institut für Pharmakologie und Toxikologie der Bundeswehr, Neuherbergstrasse 11, 80937, München, Germany
| | - Marianne Koller
- Institut für Pharmakologie und Toxikologie der Bundeswehr, Neuherbergstrasse 11, 80937, München, Germany
| | - Franz Worek
- Institut für Pharmakologie und Toxikologie der Bundeswehr, Neuherbergstrasse 11, 80937, München, Germany
| | - Stefan Kubik
- Fachbereich Chemie-Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Strasse, 67663, Kaiserslautern, Germany.
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29
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Naidich P, Valavanis G, Kubik S. Corretta localizzazione anatomica delle principali circonvoluzioni e dei principali solchi lungo la convessità inferiore e mediana con RM in sezione sagittale. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/197140099200500303] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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30
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Bärisch A, Kubik S, Stoeckicht Y, Ince H. Reshaping des linken Ventrikels – innovative Verfahren zur Herzinsuffizienztherapie? Aktuel Kardiol 2016. [DOI: 10.1055/s-0042-106717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- A. Bärisch
- Abteilung für Kardiologie und konservative Intensivmedizin, Vivantes Klinikum im Friedrichshain, Berlin
| | - S. Kubik
- Abteilung für Kardiologie und konservative Intensivmedizin, Vivantes Klinikum im Friedrichshain, Berlin
| | - Y. Stoeckicht
- Abteilung für Kardiologie und konservative Intensivmedizin, Vivantes Klinikum im Friedrichshain, Berlin
| | - H. Ince
- Abteilung für Kardiologie und konservative Intensivmedizin, Vivantes Klinikum im Friedrichshain, Berlin
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31
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Ganß A, Xu C, Guenet A, Kelm H, Kyritsakas N, Planeix JM, Kubik S, Hosseini MW. Molecular tectonics: homochiral coordination polymers based on pyridyl-substituted cyclic tetrapeptides. CrystEngComm 2016. [DOI: 10.1039/c6ce01944g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
Reaction of a tetrafunctionalized cyclen derivative containing four aldehyde groups with an appropriate diamine followed by reduction and demetalation highly efficiently affords a bis(cyclen)-derived molecular cage. Potentiometric investigations show that this compound forms dimetallic complexes with copper(II), with the two metal ions selectively coordinated to the cyclen units. X-ray crystallography indicates that these complexes could give rise to new cascade complexes after incorporation of anions between the metal centers.
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Affiliation(s)
- Alexander Ganss
- Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern , Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
| | - Raquel Belda
- Instituto de Ciencia Molecular, Departamento de Química Inorgánica, Universidad de Valencia , C/Catedrático José Beltrán 2, 46980, Valencia, Spain
| | - Javier Pitarch
- Instituto de Ciencia Molecular, Departamento de Química Inorgánica, Universidad de Valencia , C/Catedrático José Beltrán 2, 46980, Valencia, Spain
| | - Richard Goddard
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim/Ruhr, Germany
| | - Enrique García-España
- Instituto de Ciencia Molecular, Departamento de Química Inorgánica, Universidad de Valencia , C/Catedrático José Beltrán 2, 46980, Valencia, Spain
| | - Stefan Kubik
- Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern , Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
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33
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Kranawetvogl A, Müller S, Kubik S, Spruit H, Thiermann H, Worek F, Noort D, Reiter G. Elimination kinetics and molecular reaction mechanisms of cyclosarin (GF) by an oxime substituted β-cyclodextrin derivative in vitro. Toxicol Lett 2015; 239:41-52. [DOI: 10.1016/j.toxlet.2015.08.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 07/30/2015] [Accepted: 08/04/2015] [Indexed: 11/25/2022]
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Abstract
Anion receptor 2b was designed and synthesized, which was structurally derived from a previously described bis(cyclopeptide) 2a comprising two covalently linked cyclic hexapeptide rings with alternating L-proline and 6-aminopicolinic acid subunits. Solubilizing groups attached to the aromatic cyclopeptide subunits of 2b cause a substantial improvement of water solubility with respect to 2a, but have negligible effects on anion binding properties. Thus, anion affinity of 2b could be evaluated in aqueous solvent mixtures in which 2a is not sufficiently soluble, namely in water–methanol with a water content of up to 95 vol%. The solvent-dependent characterization of anion binding showed that the logKa values of the iodide and sulfate complexes of 2b decrease linearly with increasing water content while the individual contributions of complexation enthalpy and entropy correlate with the solvent composition in a more complex manner. The obtained results provide insight into the factors that control anion affinity and selectivity of these neutral receptors in aqueous media. In addition, they show that substantial anion affinity can be expected even in 100% water.
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Affiliation(s)
- Fabian Sommer
- Technische Universität Kaiserslautern, Fachbereich Chemie - Organische Chemie, Erwin-Schrödinger-Straße, D-67663 Kaiserslautern, Germany.
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35
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Abstract
This themed collection highlights some of the exciting research in supramolecular chemistry in water.
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Affiliation(s)
| | - Stefan Kubik
- Fachbereich Chemie – Organische Chemie
- Technische Universität Kaiserslautern
- 67663 Kaiserslautern
- Germany
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36
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Yapar S, Oikonomou M, Velders AH, Kubik S. Dipeptide recognition in water mediated by mixed monolayer protected gold nanoparticles. Chem Commun (Camb) 2015; 51:14247-50. [DOI: 10.1039/c5cc05909g] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Mixed monolayer protected gold nanoparticles with three orthogonal binding sites on their surface were shown to bind dipeptides in water better than analogues containing only one binding site or a combination of two.
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Affiliation(s)
- Serap Yapar
- Technische Universität Kaiserslautern
- Fachbereich Chemie - Organische Chemie
- D-67663 Kaiserslautern
- Germany
| | - Maria Oikonomou
- Laboratory of BioNanoTechnology
- Wageningen University
- 6703 HB Wageningen
- The Netherlands
| | - Aldrik H. Velders
- Laboratory of BioNanoTechnology
- Wageningen University
- 6703 HB Wageningen
- The Netherlands
| | - Stefan Kubik
- Technische Universität Kaiserslautern
- Fachbereich Chemie - Organische Chemie
- D-67663 Kaiserslautern
- Germany
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38
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Bierwisch A, Zengerle M, Thiermann H, Kubik S, Worek F. Detoxification of alkyl methylphosphonofluoridates by an oxime-substituted β-cyclodextrin – An in vitro structure–activity study. Toxicol Lett 2014; 224:209-14. [DOI: 10.1016/j.toxlet.2013.10.024] [Citation(s) in RCA: 22] [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: 07/24/2013] [Revised: 10/23/2013] [Accepted: 10/24/2013] [Indexed: 11/24/2022]
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Schaly A, Belda R, García-España E, Kubik S. Selective Recognition of Sulfate Anions by a Cyclopeptide-Derived Receptor in Aqueous Phosphate Buffer. Org Lett 2013; 15:6238-41. [DOI: 10.1021/ol4030919] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Astrid Schaly
- Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Strasse, D-67663 Kaiserslautern, Germany, and Departamento de Química, Inorgánica, Universidad de Valencia, Instituto de Ciencia Molecular, C/Catedrático José Beltrán 2, 46980, Paterna (Valencia), Spain
| | - Raquel Belda
- Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Strasse, D-67663 Kaiserslautern, Germany, and Departamento de Química, Inorgánica, Universidad de Valencia, Instituto de Ciencia Molecular, C/Catedrático José Beltrán 2, 46980, Paterna (Valencia), Spain
| | - Enrique García-España
- Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Strasse, D-67663 Kaiserslautern, Germany, and Departamento de Química, Inorgánica, Universidad de Valencia, Instituto de Ciencia Molecular, C/Catedrático José Beltrán 2, 46980, Paterna (Valencia), Spain
| | - Stefan Kubik
- Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Strasse, D-67663 Kaiserslautern, Germany, and Departamento de Química, Inorgánica, Universidad de Valencia, Instituto de Ciencia Molecular, C/Catedrático José Beltrán 2, 46980, Paterna (Valencia), Spain
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40
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Brandhuber F, Zengerle M, Porwol L, Bierwisch A, Koller M, Reiter G, Worek F, Kubik S. Tabun scavengers based on hydroxamic acid containing cyclodextrins. Chem Commun (Camb) 2013; 49:3425-7. [PMID: 23503705 DOI: 10.1039/c3cc41290c] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Arrangement of several hydroxamic acid-derived substituents along the cavity of a cyclodextrin ring leads to compounds that detoxify tabun in TRIS-HCl buffer at physiological pH and 37.0 °C with half-times as low as 3 min.
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Affiliation(s)
- Florian Brandhuber
- Institut für Pharmakologie und Toxikologie der Bundeswehr, Neuherbergstraße 11, D-80937 München, Germany
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41
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Ong PE, Athanasiadis A, Kubik S, Mahrholdt H, Sechtem U. Coronary microvascular dysfunction - a frequent cause for a pathologic exercise ECG in patients with unobstructed coronary arteries. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht309.p4011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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42
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Brandhuber F, Zengerle M, Porwol L, Tenberken O, Thiermann H, Worek F, Kubik S, Reiter G. Detoxification of tabun at physiological pH mediated by substituted β-cyclodextrin and glucose derivatives containing oxime groups. Toxicology 2012; 302:163-71. [DOI: 10.1016/j.tox.2012.08.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Revised: 08/28/2012] [Accepted: 08/29/2012] [Indexed: 01/10/2023]
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43
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44
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Lindhorst TK, Kubik S. Supramolecular Approaches to the Study of Glycobiology. Supramol Chem 2012. [DOI: 10.1002/9780470661345.smc170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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45
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Krause MR, Kubik S. Toward Engineering Intra-Receptor Interactions into Bis(crown ethers). Nat Prod Commun 2012. [DOI: 10.1177/1934578x1200700314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
A synthetic receptor was designed in which cooperative binding of two crown ether moieties to an alkali metal ion simultaneously causes two hydrophobic substituents not involved in direct host-guest interactions to converge. Hydrophobic interactions between these substituents can be expected to contribute to the overall complex stability. Independent binding studies involving two diastereoisomers of this bis(crown ether), one in which intra-receptor interactions between the substituents are potentially possible and one in which they are not, using isothermal titration calorimetry showed that both isomers bind potassium ions in different solvent mixtures with the same overall affinity. Profound differences were observed for each isomer, however, in the enthalpies and entropies of binding, which are consistent with intra-receptor interactions in one compound. These interactions are counteracted by enthalpy-entropy compensation so that no overall improvement in cation affinity could be observed.
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Affiliation(s)
- Martin R. Krause
- Fachbereich Chemie-Organische Chemie, Erwin-Schrödinger-Straße, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany
| | - Stefan Kubik
- Fachbereich Chemie-Organische Chemie, Erwin-Schrödinger-Straße, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany
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46
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Krause MR, Kubik S. Toward engineering intra-receptor interactions into bis(crown ethers). Nat Prod Commun 2012; 7:337-341. [PMID: 22545407] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023] Open
Abstract
A synthetic receptor was designed in which cooperative binding of two crown ether moieties to an alkali metal ion simultaneously causes two hydrophobic substituents not involved in direct host-guest interactions to converge. Hydrophobic interactions between these substituents can be expected to contribute to the overall complex stability. Independent binding studies involving two diastereoisomers of this bis(crown ether), one in which intra-receptor interactions between the substituents are potentially possible and one in which they are not, using isothermal titration calorimetry showed that both isomers bind potassium ions in different solvent mixtures with the same overall affinity. Profound differences were observed for each isomer, however, in the enthalpies and entropies of binding, which are consistent with intra-receptor interactions in one compound. These interactions are counteracted by enthalpy-entropy compensation so that no overall improvement in cation affinity could be observed.
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Affiliation(s)
- Martin R Krause
- Fachbereich Chemie-Organische Chemie, Erwin-Schrödinger-Strasse, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany
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47
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Sheepwash E, Luisier N, Krause MR, Noé S, Kubik S, Severin K. Supramolecular polymers based on dative boron–nitrogen bonds. Chem Commun (Camb) 2012; 48:7808-10. [DOI: 10.1039/c2cc34231f] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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48
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Zengerle M, Brandhuber F, Schneider C, Worek F, Reiter G, Kubik S. Highly efficient cyclosarin degradation mediated by a β-cyclodextrin derivative containing an oxime-derived substituent. Beilstein J Org Chem 2011; 7:1543-54. [PMID: 22238531 PMCID: PMC3252857 DOI: 10.3762/bjoc.7.182] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Accepted: 11/08/2011] [Indexed: 12/02/2022] Open
Abstract
The potential of appropriately substituted cyclodextrins to act as scavengers for neurotoxic organophosphonates under physiological conditions was evaluated. To this end, a series of derivatives containing substituents with an aldoxime or a ketoxime moiety along the narrow opening of the β-cyclodextrin cavity was synthesized, and the ability of these compounds to reduce the inhibitory effect of the neurotoxic organophosphonate cyclosarin on its key target, acetylcholinesterase, was assessed in vitro. All compounds exhibited a larger effect than native β-cyclodextrin, and characteristic differences were noted. These differences in activity were correlated with the structural and electronic parameters of the substituents. In addition, the relatively strong effect of the cyclodextrin derivatives on cyclosarin degradation and, in particular, the observed enantioselectivity are good indications that noncovalent interactions between the cyclodextrin ring and the substrate, presumably involving the inclusion of the cyclohexyl moiety of cyclosarin into the cyclodextrin cavity, contribute to the mode of action. Among the nine compounds investigated, one exhibited remarkable activity, completely preventing acetylcholinesterase inhibition by the (−)-enantiomer of cyclosarin within seconds under the conditions of the assay. Thus, these investigations demonstrate that decoration of cyclodextrins with appropriate substituents represents a promising approach for the development of scavengers able to detoxify highly toxic nerve agents.
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Affiliation(s)
- Michael Zengerle
- Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße, D-67663 Kaiserslautern, Germany
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49
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Krause MR, Goddard R, Kubik S. Anion-Binding Properties of a Cyclic Pseudohexapeptide Containing 1,5-Disubstituted 1,2,3-Triazole Subunits. J Org Chem 2011; 76:7084-95. [DOI: 10.1021/jo201024r] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Martin R. Krause
- Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Strasse, D-67663 Kaiserslautern, Germany,
| | - Richard Goddard
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim/Ruhr, Germany
| | - Stefan Kubik
- Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Strasse, D-67663 Kaiserslautern, Germany,
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50
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Schwing K, Reyheller C, Schaly A, Kubik S, Gerhards M. Structural Analysis of an Isolated Cyclic Tetrapeptide and its Monohydrate by Combined IR/UV Spectroscopy. Chemphyschem 2011; 12:1981-8. [DOI: 10.1002/cphc.201001055] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Revised: 04/07/2011] [Indexed: 11/10/2022]
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