1
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Bertouille J, Kasas S, Martin C, Hennecke U, Ballet S, Willaert RG. Fast Self-Assembly Dynamics of a β-Sheet Peptide Soft Material. Small 2023; 19:e2206795. [PMID: 36807731 DOI: 10.1002/smll.202206795] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 12/28/2022] [Indexed: 05/18/2023]
Abstract
Peptide-based hydrogels are promising biocompatible materials for wound healing, drug delivery, and tissue engineering applications. The physical properties of these nanostructured materials depend strongly on the morphology of the gel network. However, the self-assembly mechanism of the peptides that leads to a distinct network morphology is still a subject of ongoing debate, since complete assembly pathways have not yet been resolved. To unravel the dynamics of the hierarchical self-assembly process of the model β-sheet forming peptide KFE8 (Ac-FKFEFKFE-NH2 ), high-speed atomic force microscopy (HS-AFM) in liquid is used. It is demonstrated that a fast-growing network, based on small fibrillar aggregates, is formed at a solid-liquid interface, while in bulk solution, a distinct, more prolonged nanotube network emerges from intermediate helical ribbons. Moreover, the transformation between these morphologies has been visualized. It is expected that this new in situ and in real-time methodology will set the path for the in-depth unravelling of the dynamics of other peptide-based self-assembled soft materials, as well as gaining advanced insights into the formation of fibers involved in protein misfolding diseases.
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Affiliation(s)
- Jolien Bertouille
- Research Group of Organic Chemistry, Vrije Universiteit Brussel, Brussels, 1050, Belgium
| | - Sandor Kasas
- Laboratory of Biological Electron Microscopy, Ecole Polytechnique Fédérale de Lausanne, Lausanne, 1015, Switzerland
- International Joint Research Group VUB-EPFL BioNanotechnology & NanoMedicine, Vrije Universiteit Brussel, Brussels, 1050, Belgium
| | - Charlotte Martin
- Research Group of Organic Chemistry, Vrije Universiteit Brussel, Brussels, 1050, Belgium
| | - Ulrich Hennecke
- Research Group of Organic Chemistry, Vrije Universiteit Brussel, Brussels, 1050, Belgium
| | - Steven Ballet
- Research Group of Organic Chemistry, Vrije Universiteit Brussel, Brussels, 1050, Belgium
| | - Ronnie G Willaert
- International Joint Research Group VUB-EPFL BioNanotechnology & NanoMedicine, Vrije Universiteit Brussel, Brussels, 1050, Belgium
- Research Group Structural Biology Brussels, Alliance Research Group VUB-UGent NanoMicrobiology, Vrije Universiteit Brussel, Brussels, 1050, Belgium
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2
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Ernst S, Volkov AN, Stark M, Hölscher L, Steinert K, Fetzner S, Hennecke U, Drees SL. Azetidomonamide and Diazetidomonapyridone Metabolites Control Biofilm Formation and Pigment Synthesis in Pseudomonas aeruginosa. J Am Chem Soc 2022; 144:7676-7685. [PMID: 35451837 DOI: 10.1021/jacs.1c13653] [Citation(s) in RCA: 2] [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: 12/24/2022]
Abstract
Synthesis of azetidine-derived natural products by the opportunistic pathogen Pseudomonas aeruginosa is controlled by quorum sensing, a process involving the production and sensing of diffusible signal molecules that is decisive for virulence regulation. In this study, we engineered P. aeruginosa for the titratable expression of the biosynthetic aze gene cluster, which allowed the purification and identification of two new products, azetidomonamide C and diazetidomonapyridone. Diazetidomonapyridone was shown to have a highly unusual structure with two azetidine rings and an open-chain diimide moiety. Expression of aze genes strongly increased biofilm formation and production of phenazine and alkyl quinolone virulence factors. Further physiological studies revealed that all effects were mainly mediated by azetidomonamide A and diazetidomonapyridone, whereas azetidomonamides B and C had little or no phenotypic impact. The P450 monooxygenase AzeF which catalyzes a challenging, stereoselective hydroxylation of the azetidine ring converting azetidomonamide C into azetidomonamide A is therefore crucial for biological activity. Based on our findings, we propose this group of metabolites to constitute a new class of diffusible regulatory molecules with community-related effects in P. aeruginosa.
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Affiliation(s)
- Simon Ernst
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Corrensstr. 3, Münster 48149, Germany
| | - Alexander N Volkov
- VIB Centre for Structural Biology, Vlaams Instituut voor Biotechnologie (VIB), Pleinlaan 2, Brussels 1050, Belgium.,Jean Jeener NMR Centre, Vrije Universiteit Brussel (VUB), Pleinlaan 2, Brussels 1050 Belgium
| | - Melina Stark
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Corrensstr. 3, Münster 48149, Germany
| | - Lea Hölscher
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Corrensstr. 3, Münster 48149, Germany
| | - Katharina Steinert
- Institute for Food Chemistry, University of Münster, Corrensstr. 45, Münster 48149, Germany
| | - Susanne Fetzner
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Corrensstr. 3, Münster 48149, Germany
| | - Ulrich Hennecke
- Organic Chemistry Research Group, Department of Chemistry and Department of Bioengineering Sciences, Vrije Universiteit Brussel (VUB), Pleinlaan 2, Brussels 1050, Belgium
| | - Steffen Lorenz Drees
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Corrensstr. 3, Münster 48149, Germany
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3
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Guria S, Daniliuc CG, Hennecke U. Brønsted Acid‐Catalyzed Enantioselective Iodocycloetherification Enabled by Triphenylphosphine Selenide Cocatalysis. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100605] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Sudip Guria
- Organic Chemistry Research Group (ORGC) Department of Chemistry and Department of Bioengineering Sciences Vrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussel Belgium
| | | | - Ulrich Hennecke
- Organic Chemistry Research Group (ORGC) Department of Chemistry and Department of Bioengineering Sciences Vrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussel Belgium
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4
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Van Lommel R, Bock J, Daniliuc CG, Hennecke U, De Proft F. A dynamic picture of the halolactonization reaction through a combination of ab initio metadynamics and experimental investigations. Chem Sci 2021; 12:7746-7757. [PMID: 34168827 PMCID: PMC8188468 DOI: 10.1039/d1sc01014j] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2021] [Accepted: 04/22/2021] [Indexed: 01/23/2023] Open
Abstract
The halolactonization reaction is one of the most common electrophilic addition reactions to alkenes. The mechanism is generally viewed as a two-step pathway, which involves the formation of an ionic intermediate, in most cases a haliranium ion. Recently, an alternative concerted mechanism was proposed, in which the nucleophile of the reaction played a key role in the rate determining step by forming a pre-polarized complex with the alkene. This pathway was coined the nucleophile-assisted alkene activation (NAAA) mechanism. Metadynamics simulations on a series of model halolactonization reactions were used to obtain the full dynamic trajectory from reactant to product and investigate the explicit role of the halogen source and solvent molecules in the mechanism. The results in this work ratify the occasional preference of a concerted mechanism over the classic two-step transformation under specific reaction conditions. Nevertheless, as the stability of both the generated substrate cation and counter-anion increase, a transition towards the classic two-step mechanism was observed. NCI analyses on the transition states revealed that the activating role of the nucleophile is independent of the formation and stability of the intermediate. Additionally, the dynamic insights obtained from the metadynamics simulations and NCI analyses employed in this work, unveiled the presence of syn-directing noncovalent interactions, such as hydrogen bonding, between the alkenoic acid and the halogen source, which rationalized the experimentally observed diastereoselectivities. Explicit noncovalent interactions between the reactants and a protic solvent or basic additive are able to disrupt these syn-directing noncovalent interactions, affecting the diastereoselective outcome of the reaction.
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Affiliation(s)
- Ruben Van Lommel
- Eenheid Algemene Chemie (ALGC), Department of Chemistry, Vrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussels Belgium
- Molecular Design and Synthesis, Department of Chemistry, KU Leuven Celestijnenlaan 200F Leuven Chem&Tech, box 2404 3001 Leuven Belgium
| | - Jonathan Bock
- Organic Chemistry Research Group (ORGC), Department of Chemistry, Department of Bioengineering Sciences, Vrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussels Belgium
| | - Constantin G Daniliuc
- Institute for Organic Chemistry, University of Muenster Corrensstr. 40 48149 Münster Germany
| | - Ulrich Hennecke
- Organic Chemistry Research Group (ORGC), Department of Chemistry, Department of Bioengineering Sciences, Vrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussels Belgium
| | - Frank De Proft
- Eenheid Algemene Chemie (ALGC), Department of Chemistry, Vrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussels Belgium
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5
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Bock J, Guria S, Wedek V, Hennecke U. Frontispiece: Enantioselective Dihalogenation of Alkenes. Chemistry 2021. [DOI: 10.1002/chem.202181463] [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)
- Jonathan Bock
- Organic Chemistry Research Group (ORGC) Department of Chemistry and Department of Bioengineering Sciences Vrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussels Belgium
| | - Sudip Guria
- Organic Chemistry Research Group (ORGC) Department of Chemistry and Department of Bioengineering Sciences Vrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussels Belgium
| | - Volker Wedek
- Organic Chemistry Research Group (ORGC) Department of Chemistry and Department of Bioengineering Sciences Vrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussels Belgium
| | - Ulrich Hennecke
- Organic Chemistry Research Group (ORGC) Department of Chemistry and Department of Bioengineering Sciences Vrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussels Belgium
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6
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Affiliation(s)
- Jonathan Bock
- Organic Chemistry Research Group (ORGC) Department of Chemistry and Department of Bioengineering Sciences Vrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussels Belgium
| | - Sudip Guria
- Organic Chemistry Research Group (ORGC) Department of Chemistry and Department of Bioengineering Sciences Vrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussels Belgium
| | - Volker Wedek
- Organic Chemistry Research Group (ORGC) Department of Chemistry and Department of Bioengineering Sciences Vrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussels Belgium
| | - Ulrich Hennecke
- Organic Chemistry Research Group (ORGC) Department of Chemistry and Department of Bioengineering Sciences Vrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussels Belgium
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7
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Sartor P, Bock J, Hennecke U, Thierbach S, Fetzner S. Modification of the Pseudomonas aeruginosa toxin 2-heptyl-1-hydroxyquinolin-4(1H)-one and other secondary metabolites by methyltransferases from mycobacteria. FEBS J 2020; 288:2360-2376. [PMID: 33064871 DOI: 10.1111/febs.15595] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 09/22/2020] [Accepted: 10/12/2020] [Indexed: 11/26/2022]
Abstract
The opportunistic pathogen Pseudomonas aeruginosa, one of the most prevalent species in infections of the cystic fibrosis lung, produces a range of secondary metabolites, among them the respiratory toxin 2-heptyl-1-hydroxyquinolin-4(1H)-one (2-heptyl-4-hydroxyquinoline N-oxide, HQNO). Cultures of the emerging cystic fibrosis pathogen Mycobacteroides abscessus detoxify HQNO by methylating the N-hydroxy moiety. In this study, the class I methyltransferase MAB_2834c and its orthologue from Mycobacterium tuberculosis, Rv0560c, were identified as HQNO O-methyltransferases. The P. aeruginosa exoproducts 4-hydroxyquinolin-2(1H)-one (DHQ), 2-heptylquinolin-4(1H)-one (HHQ), and 2-heptyl-3-hydroxyquinolin-4(1H)-one (the 'Pseudomonas quinolone signal', PQS), some structurally related (iso)quinolones, and the flavonol quercetin were also methylated; however, HQNO was by far the preferred substrate. Both enzymes converted a benzimidazole[1,2-a]pyridine-4-carbonitrile-based compound, representing the scaffold of antimycobacterial substances, to an N-methylated derivative. We suggest that these promiscuous methyltransferases, newly termed as heterocyclic toxin methyltransferases (Htm), are involved in cellular response to chemical stress and possibly contribute to resistance of mycobacteria toward antimicrobial natural compounds as well as drugs. Thus, synthetic antimycobacterial agents may be designed to be unamenable to methyl transfer. ENZYMES: S-adenosyl-l-methionine:2-heptyl-1-hydroxyquinolin-4(1H)-one O-methyl-transferase, EC 2.1.1.
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Affiliation(s)
- Pascal Sartor
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Germany
| | - Jonathan Bock
- Organic Chemistry Research Group, Department of Chemistry and Department of Bioengineering Sciences, Vrije Universiteit Brussels, Belgium
| | - Ulrich Hennecke
- Organic Chemistry Research Group, Department of Chemistry and Department of Bioengineering Sciences, Vrije Universiteit Brussels, Belgium
| | - Sven Thierbach
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Germany
| | - Susanne Fetzner
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Germany
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8
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Wullich SC, Kobus S, Wienhold M, Hennecke U, Smits SHJ, Fetzner S. Structural basis for recognition and ring-cleavage of the Pseudomonas quinolone signal (PQS) by AqdC, a mycobacterial dioxygenase of the α/β-hydrolase fold family. J Struct Biol 2019; 207:287-294. [PMID: 31228546 DOI: 10.1016/j.jsb.2019.06.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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: 04/10/2019] [Revised: 06/16/2019] [Accepted: 06/18/2019] [Indexed: 10/26/2022]
Abstract
The cofactor-less dioxygenase AqdC of Mycobacteroides abscessus catalyzes the cleavage and thus inactivation of the Pseudomonas quinolone signal (PQS, 2-heptyl-3-hydroxy-4(1H)-quinolone), which plays a central role in the regulation of virulence factor production by Pseudomonas aeruginosa. We present here the crystal structures of AqdC in its native state and in complex with the PQS cleavage product N-octanoylanthranilic acid, and of mutant AqdC proteins in complex with PQS. AqdC possesses an α/β-hydrolase fold core domain with additional helices forming a cap domain. The protein is traversed by a bipartite tunnel, with a funnel-like entry section leading to an elliptical substrate cavity where PQS positioning is mediated by a combination of hydrophobic interactions and hydrogen bonds, with the substrate's C4 carbonyl and C3 hydroxyl groups tethered by His97 and the catalytic His246, respectively. The side chain of the AqdC-bound product extends deeper into the "alkyl tail section" of the tunnel than PQS, tentatively suggesting product exit via this part of the tunnel. AqdC prefers PQS over congeners with shorter alkyl substituents at C2. Kinetic data confirmed the strict requirement of the active-site base His246 for catalysis, and suggested that evolution of the canonical nucleophile/His/Asp catalytic triad of the hydrolases to an Ala/His/Asp triad is favorable for catalyzing dioxygenolytic PQS ring cleavage.
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Affiliation(s)
- Sandra C Wullich
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Corrensstraße 3, 48149 Münster, Germany.
| | - Stefanie Kobus
- Center for Structural Studies, Heinrich-Heine-University, Universitätsstraße 1, 40225 Düsseldorf, Germany.
| | - Max Wienhold
- Organic Chemistry Institute, University of Münster, Corrensstraße 40, 48149 Münster, Germany.
| | - Ulrich Hennecke
- Organic Chemistry Institute, University of Münster, Corrensstraße 40, 48149 Münster, Germany; Organic Chemistry Research Group, Department of Chemistry and Department of Bioengineering Sciences, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussel, Belgium.
| | - Sander H J Smits
- Center for Structural Studies, Heinrich-Heine-University, Universitätsstraße 1, 40225 Düsseldorf, Germany; Institute of Biochemistry, Heinrich-Heine-University, Universitätsstraße 1, 40225 Düsseldorf, Germany.
| | - Susanne Fetzner
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Corrensstraße 3, 48149 Münster, Germany.
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9
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Ritzmann NH, Mährlein A, Ernst S, Hennecke U, Drees SL, Fetzner S. Bromination of alkyl quinolones by Microbulbifer sp. HZ11, a marine Gammaproteobacterium, modulates their antibacterial activity. Environ Microbiol 2019; 21:2595-2609. [PMID: 31087606 DOI: 10.1111/1462-2920.14654] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Revised: 04/24/2019] [Accepted: 05/10/2019] [Indexed: 01/12/2023]
Abstract
Alkyl quinolones (AQs) are multifunctional bacterial secondary metabolites generally known for their antibacterial and algicidal properties. Certain representatives are also employed as signalling molecules of Burkholderia strains and Pseudomonas aeruginosa. The marine Gammaproteobacterium Microbulbifer sp. HZ11 harbours an AQ biosynthetic gene cluster with unusual topology but does not produce any AQ-type metabolites under laboratory conditions. In this study, we demonstrate the potential of strain HZ11 for AQ production by analysing intermediates and key enzymes of the pathway. Moreover, we demonstrate that exogenously added AQs such as 2-heptyl-1(H)-quinolin-4-one (referred to as HHQ) or 2-heptyl-1-hydroxyquinolin-4-one (referred to as HQNO) are brominated by a vanadium-dependent haloperoxidase (V-HPOHZ11 ), which preferably is active towards AQs with C5-C9 alkyl side chains. Bromination was specific for the third position and led to 3-bromo-2-heptyl-1(H)-quinolin-4-one (BrHHQ) and 3-bromo-2-heptyl-1-hydroxyquinolin-4-one (BrHQNO), both of which were less toxic for strain HZ11 than the respective parental compounds. In contrast, BrHQNO showed increased antibiotic activity against Staphylococcus aureus and marine isolates. Therefore, bromination of AQs by V-HPOHZ11 can have divergent consequences, eliciting a detoxifying effect for strain HZ11 while simultaneously enhancing antibiotic activity against other bacteria.
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Affiliation(s)
- Niklas H Ritzmann
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Münster, Germany
| | - Almuth Mährlein
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Münster, Germany
| | - Simon Ernst
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Münster, Germany
| | - Ulrich Hennecke
- Organic Chemistry Institute, University of Münster, Münster, Germany.,Organic Chemistry Research Group, Department of Chemistry and Department of Bioengineering Sciences, Vrije Universiteit Brussel, Brussel, Belgium
| | - Steffen L Drees
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Münster, Germany
| | - Susanne Fetzner
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Münster, Germany
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10
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Wedek V, Van Lommel R, Daniliuc CG, De Proft F, Hennecke U. Organokatalytische, enantioselektive Dichlorierung unfunktionalisierter Alkene. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201901777] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Volker Wedek
- Organisch-Chemisches InstitutWestfälische Wilhelms-Universität Münster Corrensstr. 40 48149 Münster Deutschland
| | - Ruben Van Lommel
- General Chemistry Research GroupDepartment of ChemistryVrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussels Belgien
| | - Constantin G. Daniliuc
- Organisch-Chemisches InstitutWestfälische Wilhelms-Universität Münster Corrensstr. 40 48149 Münster Deutschland
| | - Frank De Proft
- General Chemistry Research GroupDepartment of ChemistryVrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussels Belgien
| | - Ulrich Hennecke
- Organisch-Chemisches InstitutWestfälische Wilhelms-Universität Münster Corrensstr. 40 48149 Münster Deutschland
- Organic Chemistry Research GroupDepartment of Chemistry and Department of Bioengineering SciencesVrije Universiteit Brussel (VUB) Pleinlaan 2 1050 Brussels Belgien
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11
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Wedek V, Van Lommel R, Daniliuc CG, De Proft F, Hennecke U. Organocatalytic, Enantioselective Dichlorination of Unfunctionalized Alkenes. Angew Chem Int Ed Engl 2019; 58:9239-9243. [PMID: 31012510 DOI: 10.1002/anie.201901777] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [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: 02/10/2019] [Revised: 03/27/2019] [Indexed: 12/14/2022]
Abstract
The use of a new class of unsymmetrical cinchona-alkaloid-based, phthalazine-bridged organocatalysts enabled the highly enantioselective dichlorination of unfunctionalized alkenes. In combination with the electrophilic chlorinating agent 1,3-dichloro-5,5-dimethylhydantoin (DCDMH) and triethylsilyl chloride (TES-Cl) as the source of nucleophilic chloride, 1-aryl-2-alkyl alkenes were dichlorinated with enantioselectivities of up to 94:6 er. Initial mechanistic investigations suggest that no free chlorine is formed, and by replacement of the chloride by fluoride, enantioselective chlorofluorinations of alkenes are possible.
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Affiliation(s)
- Volker Wedek
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstr. 40, 48149, Münster, Germany
| | - Ruben Van Lommel
- General Chemistry Research Group, Department of Chemistry, Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050, Brussels, Belgium
| | - Constantin G Daniliuc
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstr. 40, 48149, Münster, Germany
| | - Frank De Proft
- General Chemistry Research Group, Department of Chemistry, Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050, Brussels, Belgium
| | - Ulrich Hennecke
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstr. 40, 48149, Münster, Germany.,Organic Chemistry Research Group, Department of Chemistry and Department of Bioengineering Sciences, Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050, Brussels, Belgium
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12
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Bock J, Daniliuc CG, Bergander K, Mück-Lichtenfeld C, Hennecke U. Synthesis, structural characterisation, and synthetic application of stable seleniranium ions. Org Biomol Chem 2019; 17:3181-3185. [PMID: 30839043 DOI: 10.1039/c9ob00078j] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Stable seleniranium ions were prepared from easily available stable bromiranium ions and diselenides. The solid state structure of the obtained seleniranium ions was determined by X-ray crystallographic analysis and their alkene-to-alkene transfer was investigated by NMR techniques. The rapid alkene-to-alkene transfer of the selenium group enabled the application of the seleniranium ion salts as selenenylating agents, which led to very efficient and highly diastereoselective, selenium-induced polyene-type cyclisations of terpene analogues.
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Affiliation(s)
- Jonathan Bock
- Organic Chemistry Institute, University of Muenster, Corrensstr. 40, 48149 Muenster, Germany
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13
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Affiliation(s)
- Jonathan Bock
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Correnssstrasse 40, 48149 Münster, Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Correnssstrasse 40, 48149 Münster, Germany
| | - Ulrich Hennecke
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Correnssstrasse 40, 48149 Münster, Germany
- Organic Chemistry Research Group, Departments of Chemistry and Bioengineering Sciences, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Elsene, Belgium
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14
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Thierbach S, Wienhold M, Fetzner S, Hennecke U. Synthesis and biological activity of methylated derivatives of the Pseudomonas metabolites HHQ, HQNO and PQS. Beilstein J Org Chem 2019; 15:187-193. [PMID: 30745993 PMCID: PMC6350858 DOI: 10.3762/bjoc.15.18] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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: 09/29/2018] [Accepted: 01/02/2019] [Indexed: 01/24/2023] Open
Abstract
Selectively methylated analogues of naturally occurring 2-heptyl-4(1H)-quinolones, which are alkaloids common within the Rutaceae family and moreover are associated with quorum sensing and virulence of the human pathogen Pseudomonas aeruginosa, have been prepared. While the synthesis by direct methylation was successful for 3-unsubstituted 2-heptyl-4(1H)-quinolones, methylated derivatives of the Pseudomonas quinolone signal (PQS) were synthesized from 3-iodinated quinolones by methylation and iodine–metal exchange/oxidation. The two N- and O-methylated derivatives of the PQS showed strong quorum sensing activity comparable to that of PQS itself. Staphylococcus aureus, another pathogenic bacterium often co-occurring with P. aeruginosa especially in the lung of cystic fibrosis patients, was inhibited in planktonic growth and cellular respiration by the 4-O-methylated derivatives of HQNO and HHQ, respectively.
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Affiliation(s)
- Sven Thierbach
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Corrensstr. 3, 48149 Münster, Germany
| | - Max Wienhold
- Organic Chemistry Institute, University of Münster, Corrensstr. 40, 48149 Münster, Germany
| | - Susanne Fetzner
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Corrensstr. 3, 48149 Münster, Germany
| | - Ulrich Hennecke
- Organic Chemistry Institute, University of Münster, Corrensstr. 40, 48149 Münster, Germany.,Organic Chemistry Research Group, Departments of Chemistry and Bioengineering Sciences, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussel, Belgium
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15
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Fricke C, Wilking M, Daniliuc CG, Hennecke U. An Enantioselective Iodolactonization/Cross-Coupling Protocol for the Synthesis of Highly Substituted Enol Lactones. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800642] [Citation(s) in RCA: 8] [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: 12/17/2022]
Affiliation(s)
- Christoph Fricke
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
| | - Michael Wilking
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
| | - Ulrich Hennecke
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
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16
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Drees SL, Ernst S, Belviso BD, Jagmann N, Hennecke U, Fetzner S. PqsL uses reduced flavin to produce 2-hydroxylaminobenzoylacetate, a preferred PqsBC substrate in alkyl quinolone biosynthesis in Pseudomonas aeruginosa. J Biol Chem 2018; 293:9345-9357. [PMID: 29669807 DOI: 10.1074/jbc.ra117.000789] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [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: 11/03/2017] [Revised: 04/06/2018] [Indexed: 01/05/2023] Open
Abstract
Alkyl hydroxyquinoline N-oxides (AQNOs) are antibiotic compounds produced by the opportunistic bacterial pathogen Pseudomonas aeruginosa They are products of the alkyl quinolone (AQ) biosynthetic pathway, which also generates the quorum-sensing molecules 2-heptyl-4(1H)-quinolone (HHQ) and 2-heptyl-3-hydroxy-4(1H)-quinolone (PQS). Although the enzymatic synthesis of HHQ and PQS had been elucidated, the route by which AQNOs are synthesized remained elusive. Here, we report on PqsL, the key enzyme for AQNO production, which structurally resembles class A flavoprotein monooxygenases such as p-hydroxybenzoate 3-hydroxylase (pHBH) and 3-hydroxybenzoate 6-hydroxylase. However, we found that unlike related enzymes, PqsL hydroxylates a primary aromatic amine group, and it does not use NAD(P)H as cosubstrate, but unexpectedly required reduced flavin as electron donor. We also observed that PqsL is active toward 2-aminobenzoylacetate (2-ABA), the central intermediate of the AQ pathway, and forms the unstable compound 2-hydroxylaminobenzoylacetate, which was preferred over 2-ABA as substrate of the downstream enzyme PqsBC. In vitro reconstitution of the PqsL/PqsBC reaction was feasible by using the FAD reductase HpaC, and we noted that the AQ:AQNO ratio is increased in an hpaC-deletion mutant of P. aeruginosa PAO1 compared with the ratio in the WT strain. A structural comparison with pHBH, the model enzyme of class A flavoprotein monooxygenases, revealed that structural features associated with NAD(P)H binding are missing in PqsL. Our study completes the AQNO biosynthetic pathway in P. aeruginosa, indicating that PqsL produces the unstable product 2-hydroxylaminobenzoylacetate from 2-ABA and depends on free reduced flavin as electron donor instead of NAD(P)H.
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Affiliation(s)
| | - Simon Ernst
- From the Institute for Molecular Microbiology and Biotechnology and
| | - Benny Danilo Belviso
- the Institute of Crystallography, Consiglio Nazionale delle Ricerche, 70126 Bari, Italy
| | - Nina Jagmann
- From the Institute for Molecular Microbiology and Biotechnology and
| | - Ulrich Hennecke
- Organic Chemistry Institute, University of Münster, D-48149 Münster, Germany and
| | - Susanne Fetzner
- From the Institute for Molecular Microbiology and Biotechnology and
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17
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Thierbach S, Birmes FS, Letzel MC, Hennecke U, Fetzner S. Chemical Modification and Detoxification of the Pseudomonas aeruginosa Toxin 2-Heptyl-4-hydroxyquinoline N-Oxide by Environmental and Pathogenic Bacteria. ACS Chem Biol 2017; 12:2305-2312. [PMID: 28708374 DOI: 10.1021/acschembio.7b00345] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
2-Heptyl-4-hydroxyquinoline N-oxide (HQNO), a major secondary metabolite and virulence factor produced by the opportunistic pathogen Pseudomonas aeruginosa, acts as a potent inhibitor of respiratory electron transfer and thereby affects host cells as well as microorganisms. In this study, we demonstrate the previously unknown capability of environmental and pathogenic bacteria to transform and detoxify this compound. Strains of Arthrobacter and Rhodococcus spp. as well as Staphylococcus aureus introduced a hydroxyl group at C-3 of HQNO, whereas Mycobacterium abscessus, M. fortuitum, and M. smegmatis performed an O-methylation, forming 2-heptyl-1-methoxy-4-oxoquinoline as the initial metabolite. Bacillus spp. produced the glycosylated derivative 2-heptyl-1-(β-d-glucopyranosydyl)-4-oxoquinoline. Assaying the effects of these metabolites on cellular respiration and on quinol oxidase activity of membrane fractions revealed that their EC50 values were up to 2 orders of magnitude higher than that of HQNO. Furthermore, cellular levels of reactive oxygen species were significantly lower in the presence of the metabolites than under the influence of HQNO. Therefore, the capacity to transform HQNO should lead to a competitive advantage against P. aeruginosa. Our findings contribute new insight into the metabolic diversity of bacteria and add another layer of complexity to the metabolic interactions which likely contribute to shaping polymicrobial communities comprising P. aeruginosa.
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Affiliation(s)
- Sven Thierbach
- Institute
for Molecular Microbiology and Biotechnology, University of Münster, 48149 Münster, Germany
| | - Franziska S. Birmes
- Institute
for Molecular Microbiology and Biotechnology, University of Münster, 48149 Münster, Germany
| | - Matthias C. Letzel
- Organic
Chemistry Institute, University of Münster, 48149 Münster, Germany
| | - Ulrich Hennecke
- Organic
Chemistry Institute, University of Münster, 48149 Münster, Germany
| | - Susanne Fetzner
- Institute
for Molecular Microbiology and Biotechnology, University of Münster, 48149 Münster, Germany
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18
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Ascheberg C, Bock J, Buß F, Mück-Lichtenfeld C, Daniliuc CG, Bergander K, Dielmann F, Hennecke U. Stable Bromiranium Ions with Weakly-Coordinating Counterions as Efficient Electrophilic Brominating Agents. Chemistry 2017. [DOI: 10.1002/chem.201701643] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Christoph Ascheberg
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität; Corrensstr. 40 48149 Münster Germany
| | - Jonathan Bock
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität; Corrensstr. 40 48149 Münster Germany
| | - Florenz Buß
- Institut für Anorganische Chemie; Westfälische Wilhelms-Universität; Corrensstr. 28/30 48149 Münster Germany
| | | | - Constantin G. Daniliuc
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität; Corrensstr. 40 48149 Münster Germany
| | - Klaus Bergander
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität; Corrensstr. 40 48149 Münster Germany
| | - Fabian Dielmann
- Institut für Anorganische Chemie; Westfälische Wilhelms-Universität; Corrensstr. 28/30 48149 Münster Germany
| | - Ulrich Hennecke
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität; Corrensstr. 40 48149 Münster Germany
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19
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Marek JJ, Singh RP, Heuer A, Hennecke U. Inside Back Cover: Enantioselective Catalysis by Using Short, Structurally Defined DNA Hairpins as Scaffold for Hybrid Catalysts (Chem. Eur. J. 25/2017). Chemistry 2017. [DOI: 10.1002/chem.201700923] [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: 11/11/2022]
Affiliation(s)
- Jasmin J. Marek
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität; Corrensstrasse 40 48149 Münster Germany
| | - Raghvendra P. Singh
- Institut für Physikalische Chemie; Westfälische Wilhelms-Universität; Corrensstrasse 28/30 48149 Münster Germany
| | - Andreas Heuer
- Institut für Physikalische Chemie; Westfälische Wilhelms-Universität; Corrensstrasse 28/30 48149 Münster Germany
| | - Ulrich Hennecke
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität; Corrensstrasse 40 48149 Münster Germany
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20
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Marek JJ, Hennecke U. Why DNA Is a More Effective Scaffold than RNA in Nucleic Acid-Based Asymmetric Catalysis-Supramolecular Control of Cooperative Effects. Chemistry 2017; 23:6009-6013. [DOI: 10.1002/chem.201606043] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Jasmin J. Marek
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Correnstraße 40 48149 Münster Germany
| | - Ulrich Hennecke
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Correnstraße 40 48149 Münster Germany
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21
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Marek JJ, Singh RP, Heuer A, Hennecke U. Enantioselective Catalysis by Using Short, Structurally Defined DNA Hairpins as Scaffold for Hybrid Catalysts. Chemistry 2017; 23:6004-6008. [PMID: 28029714 DOI: 10.1002/chem.201606002] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Indexed: 11/09/2022]
Abstract
A new type of DNA metal complex hybrid catalyst, which is based on single-stranded DNA oligonucleotides, is described. It was shown that oligonucleotides as short as 14 nucleotides that fold into hairpin structures are suitable as nucleic acid components for DNA hybrid catalysts. With these catalysts, excellent enantioinduction in asymmetric Diels-Alder reactions with selectivity values as high as 96 % enantiomeric excess (ee) can be achieved. Molecular dynamics simulations indicate that a rather flexible loop combined with a rigid stem region provides DNA scaffolds with these high selectivity values.
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Affiliation(s)
- Jasmin J Marek
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149, Münster, Germany
| | - Raghvendra P Singh
- Institut für Physikalische Chemie, Westfälische Wilhelms-Universität, Corrensstrasse 28/30, 48149, Münster, Germany
| | - Andreas Heuer
- Institut für Physikalische Chemie, Westfälische Wilhelms-Universität, Corrensstrasse 28/30, 48149, Münster, Germany
| | - Ulrich Hennecke
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149, Münster, Germany
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22
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Hennecke U, Müller CH, Daniliuc CG. Synthesis of Chiral Heterocyclic N
-Haloamides and -imides and Their Applications as Halogenating Agents and Mechanistic Probes. European J Org Chem 2016. [DOI: 10.1002/ejoc.201601159] [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: 11/07/2022]
Affiliation(s)
- Ulrich Hennecke
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
| | - Christian H. Müller
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
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23
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Wilking M, Daniliuc CG, Hennecke U. Monomeric Cinchona Alkaloid-Based Catalysts for Highly Enantioselective Bromolactonisation of Alkynes. Chemistry 2016; 22:18601-18607. [DOI: 10.1002/chem.201604003] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Indexed: 01/14/2023]
Affiliation(s)
- Michael Wilking
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Correnstraße 40 48149 Münster Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Correnstraße 40 48149 Münster Germany
| | - Ulrich Hennecke
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Correnstraße 40 48149 Münster Germany
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24
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Drees SL, Li C, Prasetya F, Saleem M, Dreveny I, Williams P, Hennecke U, Emsley J, Fetzner S. PqsBC, a Condensing Enzyme in the Biosynthesis of the Pseudomonas aeruginosa Quinolone Signal: CRYSTAL STRUCTURE, INHIBITION, AND REACTION MECHANISM. J Biol Chem 2016; 291:6610-24. [PMID: 26811339 PMCID: PMC4807248 DOI: 10.1074/jbc.m115.708453] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Indexed: 01/02/2023] Open
Abstract
Pseudomonas aeruginosa produces a number of alkylquinolone-type secondary metabolites best known for their antimicrobial effects and involvement in cell-cell communication. In the alkylquinolone biosynthetic pathway, the β-ketoacyl-(acyl carrier protein) synthase III (FabH)-like enzyme PqsBC catalyzes the condensation of octanoyl-coenzyme A and 2-aminobenzoylacetate (2-ABA) to form the signal molecule 2-heptyl-4(1H)-quinolone. PqsBC, a potential drug target, is unique for its heterodimeric arrangement and an active site different from that of canonical FabH-like enzymes. Considering the sequence dissimilarity between the subunits, a key question was how the two subunits are organized with respect to the active site. In this study, the PqsBC structure was determined to a 2 Å resolution, revealing that PqsB and PqsC have a pseudo-2-fold symmetry that unexpectedly mimics the FabH homodimer. PqsC has an active site composed of Cys-129 and His-269, and the surrounding active site cleft is hydrophobic in character and approximately twice the volume of related FabH enzymes that may be a requirement to accommodate the aromatic substrate 2-ABA. From physiological and kinetic studies, we identified 2-aminoacetophenone as a pathway-inherent competitive inhibitor of PqsBC, whose fluorescence properties could be used for in vitro binding studies. In a time-resolved setup, we demonstrated that the catalytic histidine is not involved in acyl-enzyme formation, but contributes to an acylation-dependent increase in affinity for the second substrate 2-ABA. Introduction of Asn into the PqsC active site led to significant activity toward the desamino substrate analog benzoylacetate, suggesting that the substrate 2-ABA itself supplies the asparagine-equivalent amino function that assists in catalysis.
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Affiliation(s)
| | | | | | | | | | - Paul Williams
- Life Sciences, University of Nottingham, Nottingham NG7 2RD, United Kingdom
| | - Ulrich Hennecke
- Organic Chemistry Institute, University of Münster, D-48149 Münster, Germany and the Centre for Biomolecular Sciences
| | | | - Susanne Fetzner
- From the Institute for Molecular Microbiology and Biotechnology and
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25
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Abstract
An efficient method for the halocyclization of cyclopropanes has been developed. The cyclopropanes undergo a 1,3-addition reaction to form homohalocyclization products compared to conventional alkene halocyclizations. The reaction can be induced by various electrophilic halogenating agents including 1,3-dibromo-5,5-dimethylhydantoin and N-iodosuccinimide. In cyclopropane derivatives with a preexisting stereocenter, excellent induced diastereoselectivities can be observed.
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Affiliation(s)
- Christian Rösner
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstr. 40, 48149 Münster, Germany
| | - Ulrich Hennecke
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstr. 40, 48149 Münster, Germany
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26
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27
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Müller CH, Rösner C, Hennecke U. Enantioselective haloetherifications catalyzed by 1,1'-bi-2-naphthol (BINOL) phosphates: from symmetrical alkenediols to simple alkenols. Chem Asian J 2014; 9:2162-9. [PMID: 24840391 DOI: 10.1002/asia.201402229] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [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: 03/13/2014] [Indexed: 12/19/2022]
Abstract
Asymmetric haloetherifications can be conducted using 1,1'-bi-2-naphthol (BINOL) phosphates as catalyst. In combination with simple N-haloamides such as N-iodopyrrolidinone or N-bromosuccinimide, good enantioselectivities can be achieved. However, depending on the substrate, the choice of BINOL phosphate is important, and different catalysts show remarkably different selectivities.
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Affiliation(s)
- Christian H Müller
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Fachbereich Chemie und Pharmazie, Corrensstrasse 40, 48151 Münster (Germany), Fax: (+49) 0251-83-36523
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28
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Wilking M, Hennecke U. The influence of G-quadruplex structure on DNA-based asymmetric catalysis using the G-quadruplex-bound cationic porphyrin TMPyP4·Cu. Org Biomol Chem 2014; 11:6940-5. [PMID: 23959382 DOI: 10.1039/c3ob41366g] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [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 DNA G-quadruplex-binding porphyrin TMPyP4·Cu was found to form efficient hybrid catalysts for DNA-based asymmetric catalysis when bound to DNA G-quadruplexes. Nucleobase substitution experiments using human telomere-derived G-quadruplex sequences suggest binding of the porphyrin on the 3'-face.
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Affiliation(s)
- Michael Wilking
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstr. 40, D-48149 Münster, Germany.
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29
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30
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Affiliation(s)
- Michael Wilking
- Organisch-Chemisches
Institut, Westfälische Wilhelms-Universität Münster, Corrensstrasse
40, 48149 Münster, Germany
| | - Christian Mück-Lichtenfeld
- Organisch-Chemisches
Institut, Westfälische Wilhelms-Universität Münster, Corrensstrasse
40, 48149 Münster, Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches
Institut, Westfälische Wilhelms-Universität Münster, Corrensstrasse
40, 48149 Münster, Germany
| | - Ulrich Hennecke
- Organisch-Chemisches
Institut, Westfälische Wilhelms-Universität Münster, Corrensstrasse
40, 48149 Münster, Germany
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31
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Affiliation(s)
- Ulrich Hennecke
- Organisch-Chemisches Institut, WWU Münster, Corrensstrasse 40, D-48149 Münster, Germany
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32
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Affiliation(s)
- Christian H. Müller
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149 Münster, Germany
| | - Roland Fröhlich
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149 Münster, Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149 Münster, Germany
| | - Ulrich Hennecke
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149 Münster, Germany
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33
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Hennecke U. Organic Syntheses Based on Name Reactions. A Practical Guide to 750 Transformations. 3. Auflage. Von Alfred Hassner und Irishi Namboothiri. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201203537] [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] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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34
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Hennecke U. Organic Syntheses Based on Name Reactions. A Practical Guide to 750 Transformations. 3rd Edition. By Alfred Hassner and Irishi Namboothiri. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/anie.201203537] [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] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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35
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Thierbach S, Büldt-Karentzopoulos K, Dreiling A, Hennecke U, König S, Fetzner S. Hydrolase-like properties of a cofactor-independent dioxygenase. Chembiochem 2012; 13:1125-7. [PMID: 22549932 DOI: 10.1002/cbic.201200152] [Citation(s) in RCA: 4] [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] [Received: 03/02/2012] [Indexed: 11/09/2022]
Abstract
Mechanistic promiscuity: The (2-alkyl)-3-hydroxy-4(1H)-quinolone-cleaving dioxygenase Hod has an α/β-hydrolase fold and a Ser/His/Asp triad in its active site. Isatoic anhydride, a suicide substrate of serine hydrolases, inactivates Hod by covalent modification of the active-site serine, thus indicating that the α/β-hydrolase fold can accommodate dioxygenase chemistry without completely abandoning hydrolase-like properties.
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Affiliation(s)
- Sven Thierbach
- Institute of Molecular Microbiology and Biotechnology, University of Muenster, Corrensstrasse 3, 48149 Muenster, Germany
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36
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Hennecke U. A New Approach towards the Asymmetric Fluorination of Alkenes Using Anionic Phase-Transfer Catalysts. Angew Chem Int Ed Engl 2012; 51:4532-4. [DOI: 10.1002/anie.201200831] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Indexed: 01/11/2023]
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Abstract
The addition of electrophilic reagents to the carbon-carbon double bond is one of the most fundamental reactions in organic chemistry. Halogen electrophiles constitute probably the most important class of electrophiles and have been widely used to induce electrophilic addition reactions to alkenes like halolactonizations or dihalogenations. Despite their long history and high importance, catalytic, asymmetric variants of these reactions have been underdeveloped until very recently. During the last two years this has changed and many novel approaches have been reported. This review aims to cover these new developments through discussing the common themes as well as the suggested mechanistic scenarios.
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Affiliation(s)
- Ulrich Hennecke
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstrasse 40, 48151 Münster, Germany.
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38
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Hennecke U, Müller C, Wilking M, Rühlmann A, Wibbeling B. Catalytic, Asymmetric, Bromine-Induced Semipinacol Rearrangements at Unactivated Double Bonds. Synlett 2011. [DOI: 10.1055/s-0030-1260983] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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39
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Abstract
A new approach to enantioselective haloetherification reactions via desymmetrization of in situ-generated meso-halonium ions is described. The combination of N-haloamides as a halogen source and sodium salts of chiral phosphoric acids as catalysts can be used for the cyclization of symmetrical ene-diol substrates, yielding the haloetherification products under practical conditions in enantioenriched form.
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Affiliation(s)
- Ulrich Hennecke
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Münster, Germany.
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40
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Tetlow DJ, Hennecke U, Raftery J, Waring MJ, Clarke DS, Clayden J. Sequential double α-arylation of N-allylureas by asymmetric deprotonation and N→C aryl migration. Org Lett 2010; 12:5442-5. [PMID: 21062018 DOI: 10.1021/ol102155h] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
On lithiation with lithium amides, N-allyl-N'-aryl ureas undergo rearrangement with transfer of the aryl ring from N to the allylic α carbon. From the α-arylated products, a further aryl transfer under the influence of a chiral lithium amide allows the enantioselective construction of 1,1-diarylallylamine derivatives. Stereoselectivity in these reactions results from the enantioselective formation of a planar chiral allyllithium under kinetic control.
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Affiliation(s)
- Daniel J Tetlow
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK
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41
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Clayden J, Hennecke U, Vincent MA, Hillier IH, Helliwell M. The origin of the conformational preference of N,N′-diaryl-N,N′-dimethyl ureas. Phys Chem Chem Phys 2010; 12:15056-64. [DOI: 10.1039/c0cp00571a] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [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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Glas AF, Schneider S, Maul MJ, Hennecke U, Carell T. Crystal structure of the T(6-4)C lesion in complex with a (6-4) DNA photolyase and repair of UV-induced (6-4) and Dewar photolesions. Chemistry 2009; 15:10387-96. [PMID: 19722240 DOI: 10.1002/chem.200901004] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
UV-light irradiation induces the formation of highly mutagenic lesions in DNA, such as cis-syn cyclobutane pyrimidine dimers (CPD photoproducts), pyrimidine(6-4)pyrimidone photoproducts ((6-4) photoproducts) and their Dewar valence isomers ((Dew) photoproducts). Here we describe the synthesis of defined DNA strands containing these lesions by direct irradiation. We show that all lesions are efficiently repaired except for the T(Dew)T lesion, which cannot be cleaved by the repair enzyme under our conditions. A crystal structure of a T(6-4)C lesion containing DNA duplex in complex with the (6-4) photolyase from Drosophila melanogaster provides insight into the molecular recognition event of a cytosine derived photolesion for the first time. In light of the previously postulated repair mechanism, which involves rearrangement of the (6-4) lesions into strained four-membered ring repair intermediates, it is surprising that the not rearranged T(6-4)C lesion is observed in the active site. The structure, therefore, provides additional support for the newly postulated repair mechanism that avoids this rearrangement step and argues for a direct electron injection into the lesion as the first step of the repair reaction performed by (6-4) DNA photolyases.
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Affiliation(s)
- Andreas F Glas
- Department for Chemistry and Biochemistry, Ludwig-Maximilians University, Butenandtstr. 5-13, 81377 Munich, Germany
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Glas A, Schneider S, Maul M, Hennecke U, Carell T. Cover Picture: Crystal Structure of the T(6-4)C Lesion in Complex with a (6-4) DNA Photolyase and Repair of UV-Induced (6-4) and Dewar Photolesions (Chem. Eur. J. 40/2009). Chemistry 2009. [DOI: 10.1002/chem.200990154] [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] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Clayden J, Farnaby W, Grainger DM, Hennecke U, Mancinelli M, Tetlow DJ, Hillier IH, Vincent MA. N to C Aryl Migration in Lithiated Carbamates: α-Arylation of Benzylic Alcohols. J Am Chem Soc 2009; 131:3410-1. [DOI: 10.1021/ja808959e] [Citation(s) in RCA: 52] [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: 11/28/2022]
Affiliation(s)
- Jonathan Clayden
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - William Farnaby
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Damian M. Grainger
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Ulrich Hennecke
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Michele Mancinelli
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Daniel J. Tetlow
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Ian H. Hillier
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Mark A. Vincent
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
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Abstract
2-, 3- and 4-Bromopyridine, along with other brominated electron-deficient arenes, undergo palladium-catalyzed coupling with ureas of structure RNMeCONHMe. Where R is a chiral, alpha-substituted benzyl group, treatment with LDA leads to a benzylic organolithium which undergoes rearrangement with stereospecific and regiospecific transfer of the pyridyl group, generating a quaternary stereogenic center with high enantioselectivity. Alcoholysis of the urea under neutral conditions reveals the pyridyl amine.
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Affiliation(s)
- Jonathan Clayden
- School of Chemistry, Univesity of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom.
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Brueckner F, Hennecke U, Carell T, Cramer P. CPD damage recognition by transcribing RNA polymerase II. Acta Crystallogr A 2007. [DOI: 10.1107/s0108767307097073] [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] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
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Carell T, Hennecke U, Kuch D. A General Route to 4-C-Substituted Pyrimidine Nucleosides. SYNTHESIS-STUTTGART 2007. [DOI: 10.1055/s-2007-965935] [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] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Abstract
Cells use transcription-coupled repair (TCR) to efficiently eliminate DNA lesions such as ultraviolet light-induced cyclobutane pyrimidine dimers (CPDs). Here we present the structure-based mechanism for the first step in eukaryotic TCR, CPD-induced stalling of RNA polymerase (Pol) II. A CPD in the transcribed strand slowly passes a translocation barrier and enters the polymerase active site. The CPD 5'-thymine then directs uridine misincorporation into messenger RNA, which blocks translocation. Artificial replacement of the uridine by adenosine enables CPD bypass; thus, Pol II stalling requires CPD-directed misincorporation. In the stalled complex, the lesion is inaccessible, and the polymerase conformation is unchanged. This is consistent with nonallosteric recruitment of repair factors and excision of a lesion-containing DNA fragment in the presence of Pol II.
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Affiliation(s)
- Florian Brueckner
- Munich Center for Integrated Protein Science CiPS, Ludwig-Maximilians-Universität München, Feodor-Lynen-Strasse 25, 81377 Munich, Germany
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