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Bilyk O, Oliveira GS, de Angelo RM, Almeida MO, Honório KM, Leeper FJ, Dias MVB, Leadlay PF. Enzyme-Catalyzed Spiroacetal Formation in Polyketide Antibiotic Biosynthesis. J Am Chem Soc 2022; 144:14555-14563. [PMID: 35921248 DOI: 10.1021/jacs.2c03313] [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: 12/12/2022]
Abstract
A key step in the biosynthesis of numerous polyketides is the stereospecific formation of a spiroacetal (spiroketal). We report here that spiroacetal formation in the biosynthesis of the macrocyclic polyketides ossamycin and oligomycin involves catalysis by a novel spiroacetal cyclase. OssO from the ossamycin biosynthetic gene cluster (BGC) is homologous to OlmO, the product of an unannotated gene from the oligomycin BGC. The deletion of olmO abolished oligomycin production and led to the isolation of oligomycin-like metabolites lacking the spiroacetal structure. Purified OlmO catalyzed complete conversion of the major metabolite into oligomycin C. Crystal structures of OssO and OlmO reveal an unusual 10-strand β-barrel. Three conserved polar residues are clustered together in the β-barrel cavity, and site-specific mutation of any of these residues either abolished or substantially diminished OlmO activity, supporting a role for general acid/general base catalysis in spiroacetal formation.
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Affiliation(s)
- Oksana Bilyk
- Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA, United Kingdom
| | - Gabriel S Oliveira
- Department of Microbiology, Institute of Biomedical Science, University of Sao Paulo, Av. Prof. Lineu Prestes, 1374, São Paulo, SP 05508-000, Brazil
| | - Rafaela M de Angelo
- School of Arts, Sciences and Humanities (EACH), University of Sao Paulo, São Paulo, SP 03828-000, Brazil
| | - Michell O Almeida
- Institute of Chemistry of Sao Carlos (IQSC), University of Sao Paulo, Sao Carlos, SP 13566-590, Brazil
| | - Kathia Maria Honório
- School of Arts, Sciences and Humanities (EACH), University of Sao Paulo, São Paulo, SP 03828-000, Brazil
| | - Finian J Leeper
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Marcio V B Dias
- Department of Microbiology, Institute of Biomedical Science, University of Sao Paulo, Av. Prof. Lineu Prestes, 1374, São Paulo, SP 05508-000, Brazil.,Department of Chemistry, University of Warwick, Coventry CV47 7AL, United Kingdom
| | - Peter F Leadlay
- Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA, United Kingdom
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2
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Jiang C, Zhou H, Sun H, He R, Song C, Cui T, Luan J, Fu J, Zhang Y, Jiao N, Wang H. Establishing an efficient salinomycin biosynthetic pathway in three heterologous Streptomyces hosts by constructing a 106-kb multioperon artificial gene cluster. Biotechnol Bioeng 2021; 118:4668-4677. [PMID: 34436784 DOI: 10.1002/bit.27928] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 08/06/2021] [Accepted: 08/19/2021] [Indexed: 11/09/2022]
Abstract
Salinomycin is a promising anticancer drug for chemotherapy. A highly productive biosynthetic gene cluster will facilitate the creation of analogs with improved therapeutic activity and reduced side effects. In this study, we engineered an artificial 106-kb salinomycin gene cluster and achieved efficient heterologous expression in three hosts: Streptomyces coelicolor CH999, S. lividans K4-114, and S. albus J1074. The six-operon artificial gene cluster consists of 25 genes from the native gene cluster organized into five operons and five fatty acid β-oxidation genes into one operon. All operons are driven by strong constitutive promoters. For K4-114 and J1074 harboring the artificial gene cluster, salinomycin production in shake flask cultures was 14.3 mg L-1 and 19.3 mg L-1 , respectively. The production was 1.3-fold and 1.7-fold higher, respectively, than that of the native producer S. albus DSM41398. K4-114 and J1074 harboring the native gene cluster produced an undetectable amount of salinomycin and 0.5 mg L-1 , respectively. CH999 harboring the artificial gene cluster produced 10.3 mg L-1 of salinomycin, which was 92% of the production by DSM41398. The efficient heterologous expression system based on the 106-kb multioperon artificial gene cluster established in this study will facilitate structural diversification of salinomycin, which is valuable for drug development and structure-activity studies.
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Affiliation(s)
- Chanjuan Jiang
- Institute of Marine Science and Technology, Shandong University, Qingdao, Shandong, China.,State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Helmholtz International Lab for Anti-infectives, Shandong University-Helmholtz Institute of Biotechnology, Shandong University, Qingdao, Shandong, China
| | - Haibo Zhou
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Helmholtz International Lab for Anti-infectives, Shandong University-Helmholtz Institute of Biotechnology, Shandong University, Qingdao, Shandong, China
| | - Hongluan Sun
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Helmholtz International Lab for Anti-infectives, Shandong University-Helmholtz Institute of Biotechnology, Shandong University, Qingdao, Shandong, China
| | - Ruoting He
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Helmholtz International Lab for Anti-infectives, Shandong University-Helmholtz Institute of Biotechnology, Shandong University, Qingdao, Shandong, China
| | - Chaoyi Song
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Helmholtz International Lab for Anti-infectives, Shandong University-Helmholtz Institute of Biotechnology, Shandong University, Qingdao, Shandong, China
| | - Tianqi Cui
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Helmholtz International Lab for Anti-infectives, Shandong University-Helmholtz Institute of Biotechnology, Shandong University, Qingdao, Shandong, China
| | - Ji Luan
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Helmholtz International Lab for Anti-infectives, Shandong University-Helmholtz Institute of Biotechnology, Shandong University, Qingdao, Shandong, China
| | - Jun Fu
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Helmholtz International Lab for Anti-infectives, Shandong University-Helmholtz Institute of Biotechnology, Shandong University, Qingdao, Shandong, China
| | - Youming Zhang
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Helmholtz International Lab for Anti-infectives, Shandong University-Helmholtz Institute of Biotechnology, Shandong University, Qingdao, Shandong, China
| | - Nianzhi Jiao
- Institute of Marine Science and Technology, Shandong University, Qingdao, Shandong, China
| | - Hailong Wang
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Helmholtz International Lab for Anti-infectives, Shandong University-Helmholtz Institute of Biotechnology, Shandong University, Qingdao, Shandong, China
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Abstract
Covering: up to 2020Polyketides form a large group of bioactive secondary metabolites that usually contain one or more double bonds. Although most of the double bonds found in polyketides are trans or E-configured, several cases are known in which cis or Z-configurations are observed. Double bond formation by polyketide synthases (PKSs) is widely recognised to be catalysed by ketoreduction and subsequent dehydration of the acyl carrier protein (ACP)-tethered 3-ketoacyl intermediate in the PKS biosynthetic assembly line with a specific stereochemical course in which the ketoreduction step determines the usual trans or more rare cis double bond configuration. Occasionally, other mechanisms for the installation of cis double bonds such as double bond formation during chain release or post-PKS modifications including, amongst others, isomerisations or double bond installations by oxidation are observed. This review discusses the peculiar mechanisms of cis double bond formation in polyketide biosynthesis.
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Affiliation(s)
- Zhiyong Yin
- Kekulé-Institute for Organic Chemistry and Biochemistry, University of Bonn, Gerhard-Domagk-Straße 1, 53121 Bonn, Germany.
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Park D, Swayambhu G, Lyga T, Pfeifer BA. Complex natural product production methods and options. Synth Syst Biotechnol 2021; 6:1-11. [PMID: 33474503 PMCID: PMC7803631 DOI: 10.1016/j.synbio.2020.12.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 11/19/2020] [Accepted: 12/21/2020] [Indexed: 12/29/2022] Open
Abstract
Natural products have had a major impact upon quality of life, with antibiotics as a classic example of having a transformative impact upon human health. In this contribution, we will highlight both historic and emerging methods of natural product bio-manufacturing. Traditional methods of natural product production relied upon native cellular host systems. In this context, pragmatic and effective methodologies were established to enable widespread access to natural products. In reviewing such strategies, we will also highlight the development of heterologous natural product biosynthesis, which relies instead on a surrogate host system theoretically capable of advanced production potential. In comparing native and heterologous systems, we will comment on the base organisms used for natural product biosynthesis and how the properties of such cellular hosts dictate scaled engineering practices to facilitate compound distribution. In concluding the article, we will examine novel efforts in production practices that entirely eliminate the constraints of cellular production hosts. That is, cell free production efforts will be introduced and reviewed for the purpose of complex natural product biosynthesis. Included in this final analysis will be research efforts made on our part to test the cell free biosynthesis of the complex polyketide antibiotic natural product erythromycin.
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Affiliation(s)
- Dongwon Park
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, USA
| | - Girish Swayambhu
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, USA
| | - Thomas Lyga
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, USA
| | - Blaine A Pfeifer
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, USA
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Drufva EE, Hix EG, Bailey CB. Site directed mutagenesis as a precision tool to enable synthetic biology with engineered modular polyketide synthases. Synth Syst Biotechnol 2020; 5:62-80. [PMID: 32637664 PMCID: PMC7327777 DOI: 10.1016/j.synbio.2020.04.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 04/01/2020] [Accepted: 04/06/2020] [Indexed: 12/04/2022] Open
Abstract
Modular polyketide synthases (PKSs) are a multidomain megasynthase class of biosynthetic enzymes that have great promise for the development of new compounds, from new pharmaceuticals to high value commodity and specialty chemicals. Their colinear biosynthetic logic has been viewed as a promising platform for synthetic biology for decades. Due to this colinearity, domain swapping has long been used as a strategy to introduce molecular diversity. However, domain swapping often fails because it perturbs critical protein-protein interactions within the PKS. With our increased level of structural elucidation of PKSs, using judicious targeted mutations of individual residues is a more precise way to introduce molecular diversity with less potential for global disruption of the protein architecture. Here we review examples of targeted point mutagenesis to one or a few residues harbored within the PKS that alter domain specificity or selectivity, affect protein stability and interdomain communication, and promote more complex catalytic reactivity.
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Key Words
- ACP, acyl carrier protein
- AT, acyltransferase
- DEBS, 6-deoxyerthronolide B synthase
- DH, dehydratase
- EI, enoylisomerase
- ER, enoylreductase
- KR, ketoreductase
- KS, ketosynthase
- LM, loading module
- MT, methyltransferase
- Mod, module
- PKS, polyketide synthase
- PS, pyran synthase
- Polyketide synthase
- Protein engineering
- Rational design
- SNAC, N-acetyl cysteamine
- Saturation mutagenesis
- Site directed mutagenesis
- Synthetic biology
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Affiliation(s)
- Erin E. Drufva
- Department of Chemistry, University of Tennessee-Knoxville, Knoxville, TN, 37996, USA
| | - Elijah G. Hix
- Department of Chemistry, University of Tennessee-Knoxville, Knoxville, TN, 37996, USA
| | - Constance B. Bailey
- Department of Chemistry, University of Tennessee-Knoxville, Knoxville, TN, 37996, USA
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Zhang K, Mohsin A, Dai Y, Chen Z, Zhuang Y, Chu J, Guo M. Combinatorial Effect of ARTP Mutagenesis and Ribosome Engineering on an Industrial Strain of Streptomyces albus S12 for Enhanced Biosynthesis of Salinomycin. Front Bioeng Biotechnol 2019; 7:212. [PMID: 31552238 PMCID: PMC6733881 DOI: 10.3389/fbioe.2019.00212] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [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: 06/26/2019] [Accepted: 08/20/2019] [Indexed: 12/20/2022] Open
Abstract
Salinomycin, an important polyketide, has been widely utilized in agriculture to inhibit growth of pathogenic bacteria. In addition, salinomycin has great potential in treatment of cancer cells. Due to inherited characteristics and beneficial potential, its demand is also inclining. Therefore, there is an urgent need to increase the current high demand of salinomycin. In order to obtain a high-yield mutant strain of salinomycin, the present work has developed an efficient breeding process of Streptomyces albus by using atmospheric and room temperature plasma (ARTP) combined with ribosome engineering. In this study, we investigate the presented method as it has the advantage of significantly shortening mutant screening duration by using an agar block diffusion method, as compared to other traditional strain breeding methods. As a result, the obtained mutant Tet30Chl25 with tetracycline and chloramphenicol resistance provided a salinomycin yield of 34,712 mg/L in shake flask culture, which was over 2.0-fold the parental strain S12. In addition, comparative transcriptome analysis of low and high yield mutants, and a parental strain revealed the mechanistic insight of biosynthesis pathways, in which metabolic pathways including butanoate metabolism, starch and sucrose metabolism and glyoxylate metabolism were closely associated with salinomycin biosynthesis. Moreover, we also confirmed that enhanced flux of glyoxylate metabolism via overexpression gene of isocitrate lyase (icl) promoted salinomycin biosynthesis. Based on these results, it has been successfully verified that the overexpression of crotonyl-CoA reductase gene (crr) and transcriptional regulator genes (orf 3 and orf 15), located in salinomycin synthesis gene cluster, is possibly responsible for the increase in salinomycin production in a typical strain Streptomyces albus DSM41398. Conclusively, a tentative regulatory model of ribosome engineering combined with ARTP in S. ablus is proposed to explore the roles of transcriptional regulators and stringent responses in the biosynthesis regulation of salinomycin.
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Affiliation(s)
- Kuipu Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Ali Mohsin
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Yichen Dai
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Zhongbing Chen
- Zhejiang Biok Biology Co., Ltd., Zhongguan Industrial Park, Zhejiang, China
| | - Yingping Zhuang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Ju Chu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Meijin Guo
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
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7
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Bilyk O, Samborskyy M, Leadlay PF. The biosynthetic pathway to ossamycin, a macrocyclic polyketide bearing a spiroacetal moiety. PLoS One 2019; 14:e0215958. [PMID: 31039188 PMCID: PMC6490886 DOI: 10.1371/journal.pone.0215958] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 04/11/2019] [Indexed: 01/08/2023] Open
Abstract
Ossamycin from Streptomyces hygroscopicus var. ossamyceticus is an antifungal and cytotoxic polyketide and a potent inhibitor of the mitochondrial ATPase. Analysis of a near-complete genome sequence of the ossamycin producer has allowed the identification of the 127-kbp ossamycin biosynthetic gene cluster. The presence in the cluster of a specific crotonyl-CoA carboxylase/reductase homologue suggests that the 5-methylhexanoate extension unit used in construction of the macrocyclic core is incorporated intact from the unusual precursor isobutyrylmalonyl-CoA. Surprisingly, the modular polyketide synthase uses only 14 extension modules to accomplish 15 cycles of polyketide chain extension, a rare example of programmed iteration on a modular polyketide synthase. Specific deletion of genes encoding cytochrome P450 enzymes has given insight into the late-stage tailoring of the ossamycin macrocycle required for the attachment of the unusual 2,3,4,6-deoxyaminohexose sugar l-ossamine to C-8 of the ossamycin macrocycle. The ossamycin cluster also encodes a putative spirocyclase enzyme, OssO, which may play a role in establishing the characteristic spiroketal moiety of the natural product.
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Affiliation(s)
- Oksana Bilyk
- Department of Biochemistry, University of Cambridge, Cambridge, United Kingdom
- * E-mail:
| | - Markiyan Samborskyy
- Department of Biochemistry, University of Cambridge, Cambridge, United Kingdom
| | - Peter F. Leadlay
- Department of Biochemistry, University of Cambridge, Cambridge, United Kingdom
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8
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Antoszczak M. A medicinal chemistry perspective on salinomycin as a potent anticancer and anti-CSCs agent. Eur J Med Chem 2019; 164:366-377. [DOI: 10.1016/j.ejmech.2018.12.057] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 12/20/2018] [Accepted: 12/24/2018] [Indexed: 01/30/2023]
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9
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Tocchetti A, Donadio S, Sosio M. Large inserts for big data: artificial chromosomes in the genomic era. FEMS Microbiol Lett 2018; 365:4935161. [DOI: 10.1093/femsle/fny064] [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] [Received: 01/09/2018] [Accepted: 03/13/2018] [Indexed: 02/07/2023] Open
Affiliation(s)
| | - Stefano Donadio
- Naicons Srl, 20139 Milano, Italy
- Ktedogen Srl, Via Ortles 22/4, 20139 Milano, Italy
| | - Margherita Sosio
- Naicons Srl, 20139 Milano, Italy
- Ktedogen Srl, Via Ortles 22/4, 20139 Milano, Italy
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10
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Zhang X, Lu C, Bai L. Mechanism of salinomycin overproduction in Streptomyces albus as revealed by comparative functional genomics. Appl Microbiol Biotechnol 2017; 101:4635-44. [DOI: 10.1007/s00253-017-8278-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Revised: 03/26/2017] [Accepted: 03/29/2017] [Indexed: 12/11/2022]
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Wilkening I, Gazzola S, Riva E, Parascandolo JS, Song L, Tosin M. Second-generation probes for biosynthetic intermediate capture: towards a comprehensive profiling of polyketide assembly. Chem Commun (Camb) 2016; 52:10392-5. [PMID: 27481638 PMCID: PMC5050551 DOI: 10.1039/c6cc04681a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 07/28/2016] [Indexed: 12/12/2022]
Abstract
Malonyl carba(dethia) N-decanoyl cysteamine methyl esters and novel acetoxymethyl esters were utilised as second-generation probes for polyketide intermediate capture. The use of these tools in vivo led to the characterisation of an almost complete set of biosynthetic intermediates from a modular assembly line, providing a first kinetic overview of intermediate processing leading to complex natural product formation.
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Affiliation(s)
- Ina Wilkening
- Department of Chemistry, University of Warwick, Library Road, CV4 7AL, UK.
| | - Silvia Gazzola
- Department of Chemistry, University of Warwick, Library Road, CV4 7AL, UK. and Dipartimento di Scienza ed Alta Tecnologia, Universita' dell'Insubria, Via Valleggio 11, 22100 Como, Italy
| | - Elena Riva
- Department of Chemistry, University of Warwick, Library Road, CV4 7AL, UK.
| | | | - Lijiang Song
- Department of Chemistry, University of Warwick, Library Road, CV4 7AL, UK.
| | - Manuela Tosin
- Department of Chemistry, University of Warwick, Library Road, CV4 7AL, UK.
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Zheng Q, Tian Z, Liu W. Recent advances in understanding the enzymatic reactions of [4+2] cycloaddition and spiroketalization. Curr Opin Chem Biol 2016; 31:95-102. [DOI: 10.1016/j.cbpa.2016.01.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Revised: 01/25/2016] [Accepted: 01/25/2016] [Indexed: 11/25/2022]
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Luhavaya H, Dias MVB, Williams SR, Hong H, de Oliveira LG, Leadlay PF. Enzymology of Pyran Ring A Formation in Salinomycin Biosynthesis. ACTA ACUST UNITED AC 2015; 127:13826-13829. [PMID: 27587902 PMCID: PMC4988243 DOI: 10.1002/ange.201507090] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Indexed: 01/25/2023]
Abstract
Tetrahydropyran rings are a common feature of complex polyketide natural products, but much remains to be learned about the enzymology of their formation. The enzyme SalBIII from the salinomycin biosynthetic pathway resembles other polyether epoxide hydrolases/cyclases of the MonB family, but SalBIII plays no role in the conventional cascade of ring opening/closing. Mutation in the salBIII gene gave a metabolite in which ring A is not formed. Using this metabolite in vitro as a substrate analogue, SalBIII has been shown to form pyran ring A. We have determined the X-ray crystal structure of SalBIII, and structure-guided mutagenesis of putative active-site residues has identified Asp38 and Asp104 as an essential catalytic dyad. The demonstrated pyran synthase activity of SalBIII further extends the impressive catalytic versatility of α+β barrel fold proteins.
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Affiliation(s)
- Hanna Luhavaya
- Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA (UK)
| | - Marcio V B Dias
- Department of Microbiology, Institute of Biomedical Science, University of São Paulo, Av. Prof. Lineu Prestes, 1374, 05508-000, São Paulo-SP (Brazil)
| | - Simon R Williams
- University Chemical Laboratory, University of Cambridge, Lensfield Road, Cambridge CB2 1EW (UK)
| | - Hui Hong
- Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA (UK)
| | - Luciana G de Oliveira
- Department of Organic Chemistry, University of Campinas UNICAMP, Cidade Universitária Zeferino Vaz s/n, P.O. Box 6154, 13083-970, Campinas-SP (Brazil)
| | - Peter F Leadlay
- Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA (UK)
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14
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Luhavaya H, Dias MVB, Williams SR, Hong H, de Oliveira LG, Leadlay PF. Enzymology of Pyran Ring A Formation in Salinomycin Biosynthesis. Angew Chem Int Ed Engl 2015; 54:13622-5. [PMID: 26377145 PMCID: PMC4648038 DOI: 10.1002/anie.201507090] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Indexed: 02/06/2023]
Abstract
Tetrahydropyran rings are a common feature of complex polyketide natural products, but much remains to be learned about the enzymology of their formation. The enzyme SalBIII from the salinomycin biosynthetic pathway resembles other polyether epoxide hydrolases/cyclases of the MonB family, but SalBIII plays no role in the conventional cascade of ring opening/closing. Mutation in the salBIII gene gave a metabolite in which ring A is not formed. Using this metabolite in vitro as a substrate analogue, SalBIII has been shown to form pyran ring A. We have determined the X-ray crystal structure of SalBIII, and structure-guided mutagenesis of putative active-site residues has identified Asp38 and Asp104 as an essential catalytic dyad. The demonstrated pyran synthase activity of SalBIII further extends the impressive catalytic versatility of α+β barrel fold proteins.
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Affiliation(s)
- Hanna Luhavaya
- Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA (UK)
| | - Marcio V B Dias
- Department of Microbiology, Institute of Biomedical Science, University of São Paulo, Av. Prof. Lineu Prestes, 1374, 05508-000, São Paulo-SP (Brazil)
| | - Simon R Williams
- University Chemical Laboratory, University of Cambridge, Lensfield Road, Cambridge CB2 1EW (UK)
| | - Hui Hong
- Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA (UK)
| | - Luciana G de Oliveira
- Department of Organic Chemistry, University of Campinas UNICAMP, Cidade Universitária Zeferino Vaz s/n, P.O. Box 6154, 13083-970, Campinas-SP (Brazil)
| | - Peter F Leadlay
- Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA (UK).
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Jiang C, Qi Z, Kang Q, Liu J, Jiang M, Bai L. Formation of the Δ 18,19Double Bond and Bis(spiroacetal) in Salinomycin Is Atypically Catalyzed by SlnM, a Methyltransferase-like Enzyme. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201503561] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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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16
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Jiang C, Qi Z, Kang Q, Liu J, Jiang M, Bai L. Formation of the Δ(18,19) Double Bond and Bis(spiroacetal) in Salinomycin Is Atypically Catalyzed by SlnM, a Methyltransferase-like Enzyme. Angew Chem Int Ed Engl 2015; 54:9097-100. [PMID: 26096919 PMCID: PMC4744726 DOI: 10.1002/anie.201503561] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [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: 04/19/2015] [Indexed: 11/30/2022]
Abstract
Salinomycin is a widely used polyether coccidiostat and was recently found to have antitumor activities. However, the mechanism of its biosynthesis remained largely speculative until now. Reported herein is the identification of an unprecedented function of SlnM, homologous to O‐methyltransferases, by correlating its activity with the formation of the Δ18,19 double bond and bis(spiroacetal). Detailed in vivo and in vitro investigations revealed that SlnM, using positively charged S‐adenosylmethionine (SAM) or sinefungin as the cofactor, catalyzed the spirocyclization‐coupled dehydration of C19 in a highly atypical fashion to yield salinomycin.
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Affiliation(s)
- Chunyan Jiang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Rd. Shanghai 200240 (China)
| | - Zhen Qi
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Rd. Shanghai 200240 (China)
| | - Qianjin Kang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Rd. Shanghai 200240 (China)
| | - Jing Liu
- Institute of Health Sciences, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601 (China)
| | - Ming Jiang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Rd. Shanghai 200240 (China)
| | - Linquan Bai
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Rd. Shanghai 200240 (China).
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