51
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Hartmann O, Kalesse M. The Structure Elucidation and Total Synthesis of β‐Lipomycin. Angew Chem Int Ed Engl 2014; 53:7335-8. [DOI: 10.1002/anie.201402259] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Indexed: 01/15/2023]
Affiliation(s)
- Olaf Hartmann
- Institute for Organic Chemistry and Centre of Biomolecular Drug Research (BMWZ), Leibniz Universität Hannover, Schneiderberg 1B, 30167 Hannover (Germany)
- Helmholtz Centre for Infection Research (HZI), Inhoffenstrasse 7, 38124 Braunschweig (Germany)
| | - Markus Kalesse
- Institute for Organic Chemistry and Centre of Biomolecular Drug Research (BMWZ), Leibniz Universität Hannover, Schneiderberg 1B, 30167 Hannover (Germany)
- Helmholtz Centre for Infection Research (HZI), Inhoffenstrasse 7, 38124 Braunschweig (Germany)
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52
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Xu Z, Baunach M, Ding L, Peng H, Franke J, Hertweck C. Biosynthetic code for divergolide assembly in a bacterial mangrove endophyte. Chembiochem 2014; 15:1274-9. [PMID: 24867126 DOI: 10.1002/cbic.201402071] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Indexed: 02/04/2023]
Abstract
Divergolides are structurally diverse ansamycins produced by a bacterial endophyte (Streptomyces sp.) of the mangrove tree Bruguiera gymnorrhiza. By genomic analyses a gene locus coding for the divergolide pathway was detected. The div gene cluster encodes genes for the biosynthesis of 3-amino-5-hydroxybenzoate and the rare extender units ethylmalonyl-CoA and isobutylmalonyl-CoA, polyketide assembly by a modular type I polyketide synthase (PKS), and enzymes involved in tailoring reactions, such as a Baeyer-Villiger oxygenase. A detailed PKS domain analysis confirmed the stereochemical integrity of the divergolides and provided valuable new insights into the formation of the diverse aromatic chromophores. The bioinformatic analyses and the isolation and full structural elucidation of four new divergolide congeners led to a revised biosynthetic model that illustrates the formation of four different types of ansamycin chromophores from a single polyketide precursor.
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Affiliation(s)
- Zhongli Xu
- Department of Biomolecular Chemistry, Leibniz Institute for Natural Product Research and Infection Biology (HKI), Beutenbergstrasse 11a, 07745 Jena (Germany)
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53
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Hartmann O, Kalesse M. Die Strukturaufklärung und Totalsynthese von β‐Lipomycin. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402259] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Olaf Hartmann
- Institut für Organische Chemie und Biomolekulares Wirkstoff‐ zentrum (BMWZ), Leibniz Universität Hannover, Schneiderberg 1B, 30167 Hannover (Deutschland)
- Helmholtz Zentrum für Infektionsforschung (HZI), Inhoffenstraße 7, 38124 Braunschweig (Deutschland)
| | - Markus Kalesse
- Institut für Organische Chemie und Biomolekulares Wirkstoff‐ zentrum (BMWZ), Leibniz Universität Hannover, Schneiderberg 1B, 30167 Hannover (Deutschland)
- Helmholtz Zentrum für Infektionsforschung (HZI), Inhoffenstraße 7, 38124 Braunschweig (Deutschland)
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54
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Abstract
Covering: up to the end of 2013. Myxobacteria produce a vast range of structurally diverse natural products with prominent biological activities. Here, we provide a detailed description and judge the potential of all antibiotically active myxobacterial compounds as lead structures, pointing out their particularities and, if known, their mode of action. Thus, the review provides an overview of the potential of specific compounds, suitable for future investigations and possible clinical applications.
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Affiliation(s)
- Till F Schäberle
- Institute for Pharmaceutical Biology, University of Bonn, Nussallee 6, 53115 Bonn, Germany.
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55
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Till M, Race PR. Progress challenges and opportunities for the re-engineering of trans-AT polyketide synthases. Biotechnol Lett 2014; 36:877-88. [PMID: 24557077 DOI: 10.1007/s10529-013-1449-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2013] [Accepted: 12/23/2013] [Indexed: 12/13/2022]
Abstract
Polyketides are a structurally and functionally diverse family of bioactive natural products that are used extensively as pharmaceuticals and agrochemicals. In bacteria these molecules are biosynthesized by giant, multi-functional enzymatic complexes, termed modular polyketide synthases (PKSs), that function in assembly-line like fashion to fuse and tailor simple carboxylic acid monomers into a vast array of elaborate chemical scaffolds. Modifying PKSs through targeted synthase re-engineering is a promising approach for accessing functionally-optimized polyketides. Due to their highly mosaic architectures the recently identified trans-AT family of modular synthases appear inherently more amenable to re-engineering than their well studied cis-AT counterparts. Here, we review recent progress in the re-engineering of trans-AT PKSs, summarize opportunities for harnessing the biosynthetic potential of these systems, and highlight challenges that such re-engineering approaches present.
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Affiliation(s)
- M Till
- School of Biochemistry, Medical Sciences, University of Bristol, Bristol, BS8 1TD, UK
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56
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Herkommer D, Schmalzbauer B, Menche D. Sequential catalysis for stereoselective synthesis of complex polyketides. Nat Prod Rep 2014; 31:456-67. [DOI: 10.1039/c3np70093c] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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57
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Biodiversity in production of antibiotics and other bioactive compounds. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2014; 147:37-58. [PMID: 24840777 DOI: 10.1007/10_2014_268] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
Abstract
Microbes continue to play a highly considerable role in the drug discovery and development process. Nevertheless, the number of new chemical entities (NCEs) of microbial origin that has been approved by the Food and Drug Administration (FDA) has been reduced in the past decade. This scarcity can be partly attributed to the redundancy in the discovered molecules from microbial isolates, which are isolated from common terrestrial ecological units. However, this situation can be partly overcome by exploring rarely exploited ecological niches as the source of microbes, which reduces the chances of isolating compounds similar to existing ones. The use of modern and advanced isolation techniques, modification of the existing fermentation methods, genetic modifications to induce expression of silent genes, analytical tools for the detection and identification of new chemical entities, use of polymers in fermentation to enhance yield of fermented compounds, and so on, have all aided in enhancing the frequency of acquiring novel compounds. These compounds are representative of numerous classes of diverse compounds. Thus, compounds of microbial origin and their analogues undergoing clinical trials continue to demonstrate the importance of compounds from microbial sources in modern drug discovery.
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58
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Lu HH, Raja A, Franke R, Landsberg D, Sasse F, Kalesse M. Die Synthese und biologische Evaluierung von Paläo-Soraphenen. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305331] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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59
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Lu HH, Raja A, Franke R, Landsberg D, Sasse F, Kalesse M. Synthesis and Biological Evaluation of Paleo-Soraphens. Angew Chem Int Ed Engl 2013; 52:13549-52. [DOI: 10.1002/anie.201305331] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Revised: 09/09/2013] [Indexed: 01/26/2023]
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60
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Parella T, Espinosa JF. Long-range proton-carbon coupling constants: NMR methods and applications. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2013; 73:17-55. [PMID: 23962883 DOI: 10.1016/j.pnmrs.2013.07.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Revised: 07/03/2013] [Accepted: 07/03/2013] [Indexed: 06/02/2023]
Abstract
A general review of novel NMR methods to measure heteronuclear long-range proton-carbon coupling constants ((n)JCH; n>1) in small molecules is made. NMR experiments are classified in terms of NMR pulse scheme and cross-peak nature. A discussion about simplicity, general applicability and accuracy for each particular NMR experiment is presented and exemplified. Important aspects such as the sign determination and measurement of very small coupling values involving protonated and non-protonated carbons as well as the complementarity between different experiments are also discussed. Finally, a compilation of applications in structural and conformational analysis of different types of molecules since 2000 is surveyed.
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Affiliation(s)
- Teodor Parella
- Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
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61
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Irschik H, Washausen P, Sasse F, Fohrer J, Huch V, Müller R, Prusov EV. Isolierung, Strukturaufklärung und biologische Untersuchung von Maltepoliden: bemerkenswerte Makrolide aus Myxobakterien. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201210113] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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62
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Irschik H, Washausen P, Sasse F, Fohrer J, Huch V, Müller R, Prusov EV. Isolation, Structure Elucidation, and Biological Activity of Maltepolides: Remarkable Macrolides from Myxobacteria. Angew Chem Int Ed Engl 2013; 52:5402-5. [DOI: 10.1002/anie.201210113] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Indexed: 11/12/2022]
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63
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Kitsche A, Kalesse M. Configurational Assignment of Secondary Hydroxyl Groups and Methyl Branches in Polyketide Natural Products through Bioinformatic Analysis of the Ketoreductase Domain. Chembiochem 2013; 14:851-61. [DOI: 10.1002/cbic.201300063] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Indexed: 12/17/2022]
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64
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Abstract
Polyketides are a very diverse family of natural products with an extremely broad range of biological activities and pharmacological properties, including antiproliferative, antibiotic, antifungal, or antiplasmodial activities, and in many cases specific targets are addressed at the molecular level. Their structures are characterized by diverse assemblies of methyl- and hydroxyl-bearing stereogenic centers enabling large numbers of stereochemical permutations, which are often embedded into macrolide rings. This complexity renders the stereochemical assignment and directed total synthesis challenging tasks. Within this review, we will detail practicable approaches for the stereochemical determination of diverse complex polyketides of myxobacterial origin by using computational and NMR methods in combination with novel procedures based on bioinformatics. Furthermore, we have developed efficient preparative strategies for the synthesis of these compounds, which have culminated in several first total syntheses. Key aspects of these various endeavors, which will also focus on the importance of conformational bias in complex polyketide analysis and synthesis, will be discussed within this review in the realm of the potent macrolide antibiotics etnangien and rhizopodin. Along these lines, we will also summarize novel methods for the rapid assembly of key structural elements of polyketides including a novel domino concept relying on a combination of a nucleophilic addition and a Tsuji–Trost reaction.
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Affiliation(s)
- Sebastian Essig
- 1Institut für Organische Chemie, Universität Heidelberg, INF 270, D-69120 Heidelberg, Germany
| | - Dirk Menche
- 2Kekulé-Institut für Organische Chemie und Biochemie der Universität Bonn, Gerhard-Domagk-Str. 1, D-53121 Bonn, Germany
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65
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Prusov EV. Total synthesis of antibiotics: recent achievements, limitations, and perspectives. Appl Microbiol Biotechnol 2013; 97:2773-95. [DOI: 10.1007/s00253-013-4757-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Revised: 02/04/2013] [Accepted: 02/05/2013] [Indexed: 10/27/2022]
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66
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Koryakina I, McArthur J, Randall S, Draelos MM, Musiol EM, Muddiman DC, Weber T, Williams GJ. Poly specific trans-acyltransferase machinery revealed via engineered acyl-CoA synthetases. ACS Chem Biol 2013; 8:200-8. [PMID: 23083014 DOI: 10.1021/cb3003489] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Polyketide synthases construct polyketides with diverse structures and biological activities via the condensation of extender units and acyl thioesters. Although a growing body of evidence suggests that polyketide synthases might be tolerant to non-natural extender units, in vitro and in vivo studies aimed at probing and utilizing polyketide synthase specificity are severely limited to only a small number of extender units, owing to the lack of synthetic routes to a broad variety of acyl-CoA extender units. Here, we report the construction of promiscuous malonyl-CoA synthetase variants that can be used to synthesize a broad range of malonyl-CoA extender units substituted at the C2-position, several of which contain handles for chemoselective ligation and are not found in natural biosynthetic systems. We highlighted utility of these enzymes by probing the acyl-CoA specificity of several trans-acyltransferases, leading to the unprecedented discovery of poly specificity toward non-natural extender units, several of which are not found in naturally occurring biosynthetic pathways. These results reveal that polyketide biosynthetic machinery might be more tolerant to non-natural substrates than previously established, and that mutant synthetases are valuable tools for probing the specificity of biosynthetic machinery. Our data suggest new synthetic biology strategies for harnessing this promiscuity and enabling the regioselective modification of polyketides.
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Affiliation(s)
| | | | | | | | - Ewa M. Musiol
- Eberhard-Karls-Universität Tübingen, Interfakultäres Institut für
Mikrobiologie und Infektionsmedizin, Mikrobiologie/Biotechnologie,
Tübingen, Germany
| | | | - Tilmann Weber
- Eberhard-Karls-Universität Tübingen, Interfakultäres Institut für
Mikrobiologie und Infektionsmedizin, Mikrobiologie/Biotechnologie,
Tübingen, Germany
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67
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Zheng J, Keatinge-Clay AT. The status of type I polyketide synthase ketoreductases. MEDCHEMCOMM 2013. [DOI: 10.1039/c2md20191g] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The functional dissection of type I polyketide synthases has established that ketoreductases most commonly set the orientations of the hydroxyl and alkyl substituents of complex polyketides. Here we review the biochemical, structural biology, and engineering studies that have helped elucidate how stereocontrol is enforced by these enzymes.
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Affiliation(s)
- Jianting Zheng
- Department of Chemistry and Biochemistry
- The University of Texas at Austin
- USA
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68
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Altendorfer M, Raja A, Sasse F, Irschik H, Menche D. Modular synthesis of polyene side chain analogues of the potent macrolide antibiotic etnangien by a flexible coupling strategy based on hetero-bis-metallated alkenes. Org Biomol Chem 2013. [DOI: 10.1039/c2ob26906f] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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69
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Letzel AC, Pidot SJ, Hertweck C. A genomic approach to the cryptic secondary metabolome of the anaerobic world. Nat Prod Rep 2012; 30:392-428. [PMID: 23263685 DOI: 10.1039/c2np20103h] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A total of 211 complete and published genomes from anaerobic bacteria are analysed for the presence of secondary metabolite biosynthesis gene clusters, in particular those tentatively coding for polyketide synthases (PKS) and non-ribosomal peptide synthetases (NRPS). We investigate the distribution of these gene clusters according to bacterial phylogeny and, if known, correlate these to the type of metabolic pathways they encode. The potential of anaerobes as secondary metabolite producers is highlighted.
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Affiliation(s)
- Anne-Catrin Letzel
- Leibniz Institute for Natural Product Research and Infection Biology HKI, Beutenbergstr. 11a, Jena, 07745, Germany
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70
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Essig S, Bretzke S, Müller R, Menche D. Full Stereochemical Determination of Ajudazols A and B by Bioinformatics Gene Cluster Analysis and Total Synthesis of Ajudazol B by an Asymmetric Ortholithiation Strategy. J Am Chem Soc 2012; 134:19362-5. [DOI: 10.1021/ja309685n] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Sebastian Essig
- Institut für Organische
Chemie, Ruprecht-Karls Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Sebastian Bretzke
- Institut für Organische
Chemie, Ruprecht-Karls Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Rolf Müller
- Helmholtz-Institut für
Pharmazeutische Forschung Saarland (HIPS) and Institut für
Pharmazeutische Biotechnologie, Universität des Saarlandes, Gebäude C 2.3, 66123 Saarbrücken,
Germany
| | - Dirk Menche
- Kekulé-Institut
für
Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany
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71
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Matilla MA, Stöckmann H, Leeper FJ, Salmond GPC. Bacterial biosynthetic gene clusters encoding the anti-cancer haterumalide class of molecules: biogenesis of the broad spectrum antifungal and anti-oomycete compound, oocydin A. J Biol Chem 2012; 287:39125-38. [PMID: 23012376 PMCID: PMC3493953 DOI: 10.1074/jbc.m112.401026] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Revised: 09/05/2012] [Indexed: 01/16/2023] Open
Abstract
Haterumalides are halogenated macrolides with strong antitumor properties, making them attractive targets for chemical synthesis. Unfortunately, current synthetic routes to these molecules are inefficient. The potent haterumalide, oocydin A, was previously identified from two plant-associated bacteria through its high bioactivity against plant pathogenic fungi and oomycetes. In this study, we describe oocydin A (ooc) biosynthetic gene clusters identified by genome sequencing, comparative genomics, and chemical analysis in four plant-associated enterobacteria of the Serratia and Dickeya genera. Disruption of the ooc gene cluster abolished oocydin A production and bioactivity against fungi and oomycetes. The ooc gene clusters span between 77 and 80 kb and encode five multimodular polyketide synthase (PKS) proteins, a hydroxymethylglutaryl-CoA synthase cassette and three flavin-dependent tailoring enzymes. The presence of two free-standing acyltransferase proteins classifies the oocydin A gene cluster within the growing family of trans-AT PKSs. The amino acid sequences and organization of the PKS domains are consistent with the chemical predictions and functional peculiarities associated with trans-acyltransferase PKS. Based on extensive in silico analysis of the gene cluster, we propose a biosynthetic model for the production of oocydin A and, by extension, for other members of the haterumalide family of halogenated macrolides exhibiting anti-cancer, anti-fungal, and other interesting biological properties.
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Affiliation(s)
- Miguel A. Matilla
- From the Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QW and
| | - Henning Stöckmann
- the Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Finian J. Leeper
- the Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - George P. C. Salmond
- From the Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QW and
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72
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Altendorfer M, Irschik H, Menche D. Design, synthesis and biological evaluation of simplified side chains of the macrolide antibiotic etnangien. Bioorg Med Chem Lett 2012; 22:5731-4. [DOI: 10.1016/j.bmcl.2012.06.070] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Revised: 06/22/2012] [Accepted: 06/24/2012] [Indexed: 10/28/2022]
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73
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Biosynthesis of the Respiratory Toxin Bongkrekic Acid in the Pathogenic Bacterium Burkholderia gladioli. ACTA ACUST UNITED AC 2012; 19:1164-74. [DOI: 10.1016/j.chembiol.2012.07.022] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Revised: 07/20/2012] [Accepted: 07/24/2012] [Indexed: 11/18/2022]
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74
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Crosby J, Crump MP. The structural role of the carrier protein--active controller or passive carrier. Nat Prod Rep 2012; 29:1111-37. [PMID: 22930263 DOI: 10.1039/c2np20062g] [Citation(s) in RCA: 132] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Common to all FASs, PKSs and NRPSs is a remarkable component, the acyl or peptidyl carrier protein (A/PCP). These take the form of small individual proteins in type II systems or discrete folded domains in the multi-domain type I systems and are characterized by a fold consisting of three major α-helices and between 60-100 amino acids. This protein is central to these biosynthetic systems and it must bind and transport a wide variety of functionalized ligands as well as mediate numerous protein-protein interactions, all of which contribute to efficient enzyme turnover. This review covers the structural and biochemical characterization of carrier proteins, as well as assessing their interactions with different ligands, and other synthase components. Finally, their role as an emerging tool in biotechnology is discussed.
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Affiliation(s)
- John Crosby
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
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75
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ZHU LP, Li ZF, HAN K, LI SG, LI YZ. Novel Characters of Myxobacterial Modular Natural Product Assembly Lines*. PROG BIOCHEM BIOPHYS 2012. [DOI: 10.3724/sp.j.1206.2011.00325] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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76
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Ishida K, Lincke T, Hertweck C. Assembly and Absolute Configuration of Short-Lived Polyketides fromBurkholderia thailandensis. Angew Chem Int Ed Engl 2012; 51:5470-4. [PMID: 22517609 DOI: 10.1002/anie.201200067] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Revised: 03/05/2012] [Indexed: 11/10/2022]
Affiliation(s)
- Keishi Ishida
- Leibniz Institute for Natural Product Research and Infection Biology, HKI, Dept. of Biomolecular Chemistry, and Bio Pilot Plant, Jena, Germany
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77
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Ishida K, Lincke T, Hertweck C. Assembly and Absolute Configuration of Short-Lived Polyketides fromBurkholderia thailandensis. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201200067] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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78
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Huang SX, Wang XJ, Yan Y, Wang JD, Zhang J, Liu CX, Xiang WS, Shen B. Neaumycin: a new macrolide from Streptomyces sp. NEAU-x211. Org Lett 2012; 14:1254-7. [PMID: 22332843 PMCID: PMC3293494 DOI: 10.1021/ol300074d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Neaumycin, a new 30-membered macrolide featuring an internal diester bridge, a molecular architecture that is unprecedented among known macrolide natural products, was isolated from a soil actinomycete strain Streptomyces sp. NEAU-x211. The structure of neaumycin was elucidated on the basis of comprehensive mass and NMR spectroscopic interpretation, including the relative stereochemistry of four independent coupling systems.
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Affiliation(s)
- Sheng-Xiong Huang
- Department of Chemistry, The Scripps Research Institute, Jupiter, Florida 33458, USA
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79
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Pistorius D, Müller R. Discovery of the Rhizopodin Biosynthetic Gene Cluster in Stigmatella aurantiaca Sg a15 by Genome Mining. Chembiochem 2012; 13:416-26. [DOI: 10.1002/cbic.201100575] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Indexed: 11/06/2022]
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80
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Altendorfer M, Menche D. Efficient synthesis of diverse hetero-bis-metallated alkenes as modular reagents towards highly conjugated and isolated olefinic systems. Chem Commun (Camb) 2012; 48:8267-9. [DOI: 10.1039/c2cc34052f] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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81
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Kwan DH, Schulz F. The stereochemistry of complex polyketide biosynthesis by modular polyketide synthases. Molecules 2011; 16:6092-115. [PMID: 21775938 PMCID: PMC6264292 DOI: 10.3390/molecules16076092] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2011] [Revised: 07/06/2011] [Accepted: 07/18/2011] [Indexed: 11/24/2022] Open
Abstract
Polyketides are a diverse class of medically important natural products whose biosynthesis is catalysed by polyketide synthases (PKSs), in a fashion highly analogous to fatty acid biosynthesis. In modular PKSs, the polyketide chain is assembled by the successive condensation of activated carboxylic acid-derived units, where chain extension occurs with the intermediates remaining covalently bound to the enzyme, with the growing polyketide tethered to an acyl carrier domain (ACP). Carboxylated acyl-CoA precursors serve as activated donors that are selected by the acyltransferase domain (AT) providing extender units that are added to the growing chain by condensation catalysed by the ketosynthase domain (KS). The action of ketoreductase (KR), dehydratase (DH), and enoylreductase (ER) activities can result in unreduced, partially reduced, or fully reduced centres within the polyketide chain depending on which of these enzymes are present and active. The PKS-catalysed assembly process generates stereochemical diversity, because carbon–carbon double bonds may have either cis- or trans- geometry, and because of the chirality of centres bearing hydroxyl groups (where they are retained) and branching methyl groups (the latter arising from use of propionate extender units). This review shall cover the studies that have determined the stereochemistry in many of the reactions involved in polyketide biosynthesis by modular PKSs.
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Affiliation(s)
- David H. Kwan
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver B.C., V6T 1Z1, Canada
- Authors to whom correspondence should be addressed; (D.H.K.); (F.S.); Tel.: +1-604-822-9300 (D.H.K.); +49-231-133-2429 (F.S.); Fax: +1-604-822-9126 (D.H.K.); +49-231-133-2498 (F.S.)
| | - Frank Schulz
- Fakultät für Chemie, Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 6, 44221 Dortmund, Germany
- Max-Planck-Institut für Molekulare Physiologie, Abteilung für Chemische Biologie, Otto-Hahn- Straße 11, 44227 Dortmund, Germany
- Authors to whom correspondence should be addressed; (D.H.K.); (F.S.); Tel.: +1-604-822-9300 (D.H.K.); +49-231-133-2429 (F.S.); Fax: +1-604-822-9126 (D.H.K.); +49-231-133-2498 (F.S.)
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82
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Khatri Y, Hannemann F, Perlova O, Müller R, Bernhardt R. Investigation of cytochromes P450 in myxobacteria: Excavation of cytochromes P450 from the genome ofSorangium cellulosumSo ce56. FEBS Lett 2011; 585:1506-13. [DOI: 10.1016/j.febslet.2011.04.035] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2011] [Revised: 04/13/2011] [Accepted: 04/14/2011] [Indexed: 10/18/2022]
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83
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Teta R, Gurgui M, Helfrich EJN, Künne S, Schneider A, Van Echten-Deckert G, Mangoni A, Piel J. Genome mining reveals trans-AT polyketide synthase directed antibiotic biosynthesis in the bacterial phylum bacteroidetes. Chembiochem 2011; 11:2506-12. [PMID: 21080397 DOI: 10.1002/cbic.201000542] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Roberta Teta
- Kekulé Institute of Organic Chemistry and Biochemistry, University of Bonn, Gerhard-Domagk-Strasse 1, 53121 Bonn, Germany
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84
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Gulder TAM, Freeman MF, Piel J. The Catalytic Diversity of Multimodular Polyketide Synthases: Natural Product Biosynthesis Beyond Textbook Assembly Rules. Top Curr Chem (Cham) 2011. [PMID: 21360321 DOI: 10.1007/128_2010_113] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Bacterial multimodular polyketide synthases (PKSs) are responsible for the biosynthesis of a wide range of pharmacologically active natural products. These megaenzymes contain numerous catalytic and structural domains and act as biochemical templates to generate complex polyketides in an assembly line-like fashion. While the prototypical PKS is composed of only a few different domain types that are fused together in a combinatorial fashion, an increasing number of enzymes is being found that contain additional components. These domains can introduce remarkably diverse modifications into polyketides. This review discusses our current understanding of such noncanonical domains and their role in expanding the biosynthetic versatility of bacterial PKSs.
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85
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Irschik H, Kopp M, Weissman KJ, Buntin K, Piel J, Müller R. Analysis of the sorangicin gene cluster reinforces the utility of a combined phylogenetic/retrobiosynthetic analysis for deciphering natural product assembly by trans-AT PKS. Chembiochem 2011; 11:1840-9. [PMID: 20715267 DOI: 10.1002/cbic.201000313] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Herbert Irschik
- Microbial Drugs, Helmholtz Center for Infection Research, Inhoffenstrasse 7, 38124 Braunschweig, Germany
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86
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Kwan DH, Leadlay PF. Mutagenesis of a modular polyketide synthase enoylreductase domain reveals insights into catalysis and stereospecificity. ACS Chem Biol 2010; 5:829-38. [PMID: 20666435 DOI: 10.1021/cb100175a] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Modular type I polyketide synthases (PKSs) such as the 6-deoxyerythronolide B synthase (DEBS) or the rapamycin synthase (RAPS) biosynthesize their polyketide products in a fashion similar to fatty acid biosynthesis. Each module of these enzymes consists of multiple catalytic domains. The constituent enoylreductase (ER) domain of a given module stereospecifically reduces an enzyme-bound 2-enoyl intermediate. In a recombinant model PKS containing an ER domain derived from module 13 of RAPS, we have previously used site-specific mutagenesis to identify a key active site residue that influences the stereochemistry of enoylreduction. In this study we have identified further residues involved in stereospecificity. We show here that several other residues, previously considered as catalytically important in the medium-chain dehydrogenase/reductase family of enzymes to which PKS ERs belong, are not essential for enoylreduction in polyketide biosynthesis. However, our results suggest that a lysine residue, also modeled to lie at the active site, might serve as a proton donor to the C-2 position during enoylreduction, as previously proposed for an analogously placed lysine in mammalian fatty acid synthase. These findings further highlight the close mechanistic link between fatty acid and polyketide synthases and provide useful guidance for future biosynthetic engineering of complex polyketide biosynthesis.
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Affiliation(s)
- David H. Kwan
- Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge, United Kingdom CB2 1GA
| | - Peter F. Leadlay
- Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge, United Kingdom CB2 1GA
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87
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Marine myxobacteria as a source of antibiotics--comparison of physiology, polyketide-type genes and antibiotic production of three new isolates of Enhygromyxa salina. Mar Drugs 2010; 8:2466-79. [PMID: 20948900 PMCID: PMC2953396 DOI: 10.3390/md8092466] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 08/25/2010] [Accepted: 09/01/2010] [Indexed: 12/04/2022] Open
Abstract
Three myxobacterial strains, designated SWB004, SWB005 and SWB006, were obtained from beach sand samples from the Pacific Ocean and the North Sea. The strains were cultivated in salt water containing media and subjected to studies to determine their taxonomic status, the presence of genes for the biosynthesis of polyketides and antibiotic production. 16S rDNA sequence analysis revealed the type strain Enhygromyxa salina SHK-1T as their closest homolog, displaying between 98% (SWB005) and 99% (SWB004 and SWB006) sequence similarity. All isolates were rod-shaped cells showing gliding motility and fruiting body formation as is known for myxobacteria. They required NaCl for growth, with an optimum concentration of around 2% [w/v]. The G + C-content of genomic DNA ranged from 63.0 to 67.3 mol%. Further, the strains were analyzed for their potential to produce polyketide-type structures. PCR amplified ketosynthase-like gene fragments from all three isolates enhances the assumption that these bacteria produce polyketides. SWB005 was shown to produce metabolites with prominent antibacterial activity, including activity towards methicillin resistant Staphylococcus aureus (MRSA) and Staphylococcus epidermidis (MRSE).
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88
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Khatri Y, Girhard M, Romankiewicz A, Ringle M, Hannemann F, Urlacher VB, Hutter MC, Bernhardt R. Regioselective hydroxylation of norisoprenoids by CYP109D1 from Sorangium cellulosum So ce56. Appl Microbiol Biotechnol 2010; 88:485-95. [PMID: 20645086 DOI: 10.1007/s00253-010-2756-3] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2010] [Revised: 06/29/2010] [Accepted: 06/29/2010] [Indexed: 11/26/2022]
Abstract
Sesquiterpenes are particularly interesting as flavorings and fragrances or as pharmaceuticals. Regio- or stereoselective functionalizations of terpenes are one of the main goals of synthetic organic chemistry, which are possible through radical reactions but are not selective enough to introduce the desired chiral alcohol function into those compounds. Cytochrome P450 monooxygenases are versatile biocatalysts and are capable of performing selective oxidations of organic molecules. We were able to demonstrate that CYP109D1 from Sorangium cellulosum So ce56 functions as a biocatalyst for the highly regioselective hydroxylation of norisoprenoids, alpha- and beta-ionone, which are important aroma compounds of floral scents. The substrates alpha- and beta-ionone were regioselectively hydroxylated to 3-hydroxy-alpha-ionone and 4-hydroxy-beta-ionone, respectively, which was confirmed by (1)H NMR and (13)C NMR. The results of docking alpha- and beta-ionone into a homology model of CYP109D1 gave a rational explanation for the regio-selectivity of the hydroxylation. Kinetic studies revealed that alpha- and beta-ionone can be hydroxylated with nearly identical V (max) and K (m) values. This is the first comprehensive investigation of the regioselective hydroxylation of norisoprenoids by CYP109D1.
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Affiliation(s)
- Yogan Khatri
- Department of Biochemistry, Saarland University, Saarbrücken, Germany
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89
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Erol Ö, Schäberle TF, Schmitz A, Rachid S, Gurgui C, El Omari M, Lohr F, Kehraus S, Piel J, Müller R, König GM. Biosynthesis of the Myxobacterial Antibiotic Corallopyronin A. Chembiochem 2010; 11:1253-65. [DOI: 10.1002/cbic.201000085] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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90
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Abstract
This review discusses the biosynthesis of natural products that are generated by trans-AT polyketide synthases, a family of catalytically versatile enzymes that have recently been recognized as one of the major group of proteins involved in the production of bioactive polyketides. 436 references are cited.
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Affiliation(s)
- Jörn Piel
- Kekulé Institute of Organic Chemistry and Biochemistry, University of Bonn, Bonn, Germany.
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91
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Li P, Li J, Arikan F, Ahlbrecht W, Dieckmann M, Menche D. Stereoselective Total Synthesis of Etnangien and Etnangien Methyl Ester. J Org Chem 2010; 75:2429-44. [DOI: 10.1021/jo100201f] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pengfei Li
- Institut für Organische Chemie, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Jun Li
- Helmholtz-Zentrum für Infektionsforschung, Medizinische Chemie, Inhoffenstrasse 7, D-38124 Braunschweig, Germany
| | - Fatih Arikan
- Helmholtz-Zentrum für Infektionsforschung, Medizinische Chemie, Inhoffenstrasse 7, D-38124 Braunschweig, Germany
| | - Wiebke Ahlbrecht
- Institut für Organische Chemie, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Michael Dieckmann
- Institut für Organische Chemie, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Dirk Menche
- Institut für Organische Chemie, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
- Helmholtz-Zentrum für Infektionsforschung, Medizinische Chemie, Inhoffenstrasse 7, D-38124 Braunschweig, Germany
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92
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Menche D, Li P, Irschik H. Design, synthesis and biological evaluation of simplified analogues of the RNA polymerase inhibitor etnangien. Bioorg Med Chem Lett 2010; 20:939-41. [DOI: 10.1016/j.bmcl.2009.12.066] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2009] [Revised: 12/15/2009] [Accepted: 12/15/2009] [Indexed: 11/16/2022]
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93
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Weissman KJ, Müller R. Myxobacterial secondary metabolites: bioactivities and modes-of-action. Nat Prod Rep 2010; 27:1276-95. [DOI: 10.1039/c001260m] [Citation(s) in RCA: 225] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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94
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The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2008. Coord Chem Rev 2010. [DOI: 10.1016/j.ccr.2009.07.018] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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95
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Fisch KM, Gurgui C, Heycke N, van der Sar SA, Anderson SA, Webb VL, Taudien S, Platzer M, Rubio BK, Robinson SJ, Crews P, Piel J. Polyketide assembly lines of uncultivated sponge symbionts from structure-based gene targeting. Nat Chem Biol 2009; 5:494-501. [PMID: 19448639 DOI: 10.1038/nchembio.176] [Citation(s) in RCA: 162] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2008] [Accepted: 03/25/2009] [Indexed: 11/09/2022]
Abstract
There is increasing evidence that uncultivated bacterial symbionts are the true producers of numerous bioactive compounds isolated from marine sponges. The localization and heterologous expression of biosynthetic genes could clarify this issue and provide sustainable supplies for a wide range of pharmaceuticals. However, identification of genes in the usually highly complex symbiont communities remains a challenging task. For polyketides, one of the most important groups of sponge-derived drug candidates, we have developed a general strategy that allows one to rapidly access biosynthetic gene clusters based on chemical moieties. Using this method, we targeted polyketide synthase genes from two different sponge metagenomes. We have obtained from a sponge-bacterial association a complete pathway for the rare and potent antitumor agent psymberin from Psammocinia aff. bulbosa. The data support the symbiont hypothesis and provide insights into natural product evolution in previously inaccessible bacteria.
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Affiliation(s)
- Katja M Fisch
- Kekulé Institute of Organic Chemistry and Biochemistry, University of Bonn, Bonn, Germany
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96
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Li P, Li J, Arikan F, Ahlbrecht W, Dieckmann M, Menche D. Total Synthesis of Etnangien. J Am Chem Soc 2009; 131:11678-9. [DOI: 10.1021/ja9056163] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pengfei Li
- Institut für Organische Chemie, Ruprecht-Karls-Universität Heidelberg, INF 270, D-69120 Heidelberg, Germany, and Helmholtz-Zentrum für Infektionsforschung, Medizinische Chemie, Inhoffenstr. 7, D-38124 Braunschweig, Germany
| | - Jun Li
- Institut für Organische Chemie, Ruprecht-Karls-Universität Heidelberg, INF 270, D-69120 Heidelberg, Germany, and Helmholtz-Zentrum für Infektionsforschung, Medizinische Chemie, Inhoffenstr. 7, D-38124 Braunschweig, Germany
| | - Fatih Arikan
- Institut für Organische Chemie, Ruprecht-Karls-Universität Heidelberg, INF 270, D-69120 Heidelberg, Germany, and Helmholtz-Zentrum für Infektionsforschung, Medizinische Chemie, Inhoffenstr. 7, D-38124 Braunschweig, Germany
| | - Wiebke Ahlbrecht
- Institut für Organische Chemie, Ruprecht-Karls-Universität Heidelberg, INF 270, D-69120 Heidelberg, Germany, and Helmholtz-Zentrum für Infektionsforschung, Medizinische Chemie, Inhoffenstr. 7, D-38124 Braunschweig, Germany
| | - Michael Dieckmann
- Institut für Organische Chemie, Ruprecht-Karls-Universität Heidelberg, INF 270, D-69120 Heidelberg, Germany, and Helmholtz-Zentrum für Infektionsforschung, Medizinische Chemie, Inhoffenstr. 7, D-38124 Braunschweig, Germany
| | - Dirk Menche
- Institut für Organische Chemie, Ruprecht-Karls-Universität Heidelberg, INF 270, D-69120 Heidelberg, Germany, and Helmholtz-Zentrum für Infektionsforschung, Medizinische Chemie, Inhoffenstr. 7, D-38124 Braunschweig, Germany
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Cheng YQ, Coughlin JM, Lim SK, Shen B. Type I polyketide synthases that require discrete acyltransferases. Methods Enzymol 2009; 459:165-86. [PMID: 19362640 DOI: 10.1016/s0076-6879(09)04608-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
The diverse structures of polyketide natural products are reflected by the equally diverse polyketide biosynthetic enzymes, namely polyketide synthases (PKSs). Three major classes of PKSs are known-noniterative type I PKSs, iterative type II PKSs and acyl carrier protein-independent type III PKSs, each of which consists of additional variants. One such variant is the noniterative type I PKS in which each PKS module lacks the cognate acyltransferase (AT) domain. The essential AT activity is instead provided by a discrete AT in trans. Termed "AT-less" type I PKSs, the loading of the malonate extender units by the discrete AT enzyme LnmG to each of the AT-less PKS modules of LnmI and LnmJ was confirmed experimentally for biosynthesis of the anticancer antibiotic leinamycin (LNM). The LNM PKS has since served as a model for the continuous discovery of numerous additional AT-less type I PKSs incorporating variable extender units. However, biochemical characterization of AT-less type I PKSs remains very limited, and the mechanism by which AT-less type I PKSs accommodate multiple extender units is unknown. This chapter provides the protocols used to establish and characterize the LNM PKS. Application of these methods to other AT-less type I PKSs should aid the biochemical characterization and hence possible exploitation of these unique PKSs for polyketide natural product structural diversity by combinatorial biosynthetic methods.
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Affiliation(s)
- Yi-Qiang Cheng
- Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, USA
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99
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100
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Wenzel SC, Müller R. The impact of genomics on the exploitation of the myxobacterial secondary metabolome. Nat Prod Rep 2009; 26:1385-407. [DOI: 10.1039/b817073h] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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