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Smith MD, Robinson SL, Molomjamts M, Wackett LP. In Vivo Assay Reveals Microbial OleA Thiolases Initiating Hydrocarbon and β-Lactone Biosynthesis. mBio 2020; 11:e00111-20. [PMID: 32156808 PMCID: PMC7064751 DOI: 10.1128/mbio.00111-20] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 01/22/2020] [Indexed: 12/29/2022] Open
Abstract
OleA, a member of the thiolase superfamily, is known to catalyze the Claisen condensation of long-chain acyl coenzyme A (acyl-CoA) substrates, initiating metabolic pathways in bacteria for the production of membrane lipids and β-lactone natural products. OleA homologs are found in diverse bacterial phyla, but to date, only one homodimeric OleA has been successfully purified to homogeneity and characterized in vitro A major impediment for the identification of new OleA enzymes has been protein instability and time-consuming in vitro assays. Here, we developed a bioinformatic pipeline to identify OleA homologs and a new rapid assay to screen OleA enzyme activity in vivo and map their taxonomic diversity. The screen is based on the discovery that OleA displayed surprisingly high rates of p-nitrophenyl ester hydrolysis, an activity not shared by other thiolases, including FabH. The high rates allowed activity to be determined in vitro and with heterologously expressed OleA in vivo via the release of the yellow p-nitrophenol product. Seventy-four putative oleA genes identified in the genomes of diverse bacteria were heterologously expressed in Escherichia coli, and 25 showed activity with p-nitrophenyl esters. The OleA proteins tested were encoded in variable genomic contexts from seven different phyla and are predicted to function in distinct membrane lipid and β-lactone natural product metabolic pathways. This study highlights the diversity of unstudied OleA proteins and presents a rapid method for their identification and characterization.IMPORTANCE Microbially produced β-lactones are found in antibiotic, antitumor, and antiobesity drugs. Long-chain olefinic membrane hydrocarbons have potential utility as fuels and specialty chemicals. The metabolic pathway to both end products share bacterial enzymes denoted as OleA, OleC, and OleD that transform acyl-CoA cellular intermediates into β-lactones. Bacteria producing membrane hydrocarbons via the Ole pathway additionally express a β-lactone decarboxylase, OleB. Both β-lactone and olefin biosynthesis pathways are initiated by OleA enzymes that define the overall structure of the final product. There is currently very limited information on OleA enzymes apart from the single representative from Xanthomonas campestris In this study, bioinformatic analysis identified hundreds of new, putative OleA proteins, 74 proteins were screened via a rapid whole-cell method, leading to the identification of 25 stably expressed OleA proteins representing seven bacteria phyla.
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Affiliation(s)
- Megan D Smith
- Biotechnology Institute, University of Minnesota, St. Paul, Minnesota, USA
- Department of Microbiology and Immunology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Serina L Robinson
- Biotechnology Institute, University of Minnesota, St. Paul, Minnesota, USA
- Department of Microbiology and Immunology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Mandkhai Molomjamts
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, Minnesota, USA
| | - Lawrence P Wackett
- Biotechnology Institute, University of Minnesota, St. Paul, Minnesota, USA
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, Minnesota, USA
- Microbial and Plant Genomics Institute, University of Minnesota, St. Paul, Minnesota, USA
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Tan L, Li P, Zhang Q, Izquierdo R, Chaker M, Ma D. Toward Enhancing Solar Cell Performance: An Effective and "Green" Additive. ACS APPLIED MATERIALS & INTERFACES 2018; 10:6498-6504. [PMID: 29401370 DOI: 10.1021/acsami.7b17495] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Performance of bulk heterojunction polymer solar cells (PSCs) highly relies on the morphology of the photoactive layer involving conjugated polymers and fullerene derivatives as donors and acceptors, respectively. Herein, butylamine was found to be able to optimize the morphology of the donor/acceptor (D/A) film composed of a blend of poly(3-hexylthiophene-2,5-diyl) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM). Compared to the commonly used alkane dithiols and halogenated additives with high boiling points, butylamine has a much lower boiling point between 77 and 79 °C, and it is also much "greener". A specific interaction between butylamine and PCBM was demonstrated to account for the morphology improvement. Essentially, butylamine can selectively dissolve PCBM in the P3HT:PCBM blend and facilitate the diffusion of PCBM in the film fabrication processes. Atomic force microscopy and X-ray photoelectron spectroscopy investigations confirmed the formation of the P3HT-enriched top surface and the abundance of PCBM at the bottom side, i.e., the formation of vertical phase segregation, as a consequence of the specific PCBM-butylamine interaction. The D/A film with inhomogeneously distributed D and A components in the vertical film direction, with more P3HT at the hole extraction side and more PCBM at the electron extraction side, enables more efficient charge extraction in the D/A film, reflected by the largely enhanced fill factor. The power conversion efficiency of devices reached 4.03 and 4.61%, respectively, depending on the thickness of the D/A film, and these are among the best values reported for P3HT:PCBM-based devices. As compared to the devices fabricated without the introduction of butylamine under otherwise the same processing conditions, they represented 19.6 and 21.6% improvement in the efficiency, respectively. The discovery of butylamine as a new, effective additive in enhancing the performance of PSCs strongly suggests that the differential affinity of additives toward donors and acceptors likely plays a more important role in morphology optimization than their boiling point, different from what was reported previously. The finding provides useful information for realizing large-area PSC fabrication, where a "greener" additive is always preferred.
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Affiliation(s)
- Long Tan
- Énergie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique (INRS) , 1650 Boul. Lionel-Boulet, Varennes, Quebec J3X 1S2, Canada
| | - Pandeng Li
- Énergie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique (INRS) , 1650 Boul. Lionel-Boulet, Varennes, Quebec J3X 1S2, Canada
| | - Qingzhe Zhang
- Énergie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique (INRS) , 1650 Boul. Lionel-Boulet, Varennes, Quebec J3X 1S2, Canada
| | - Ricardo Izquierdo
- Department of Electrical Engineering, École de technologie supérieure, Université du Quebec 1100 , rue Notre-Dame Ouest, Montreal, Quebec H3C 1K3, Canada
| | - Mohamed Chaker
- Énergie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique (INRS) , 1650 Boul. Lionel-Boulet, Varennes, Quebec J3X 1S2, Canada
| | - Dongling Ma
- Énergie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique (INRS) , 1650 Boul. Lionel-Boulet, Varennes, Quebec J3X 1S2, Canada
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Cheng Y, Wang X, Li W, Chang D. DFT study on the effects of catalysis by β-cyclodextrin in the reaction of p-nitrophenyl acetate. J Mol Model 2017; 23:21. [DOI: 10.1007/s00894-016-3197-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Accepted: 12/16/2016] [Indexed: 11/28/2022]
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4
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Rougier NM, Vico RV, de Rossi RH, Buján EI. Stabilization of the pesticide Fenitrothion towardOandNnucleophiles in the presence of cyclodextrins. J PHYS ORG CHEM 2014. [DOI: 10.1002/poc.3373] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Natalia M. Rougier
- Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC), CONICET and Departamento de Química Orgánica, Facultad de Ciencias Químicas; Universidad Nacional de Córdoba; Haya de la Torre y Medina Allende, Ciudad Universitaria X5000HUA Córdoba Argentina
| | - Raquel V. Vico
- Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC), CONICET and Departamento de Química Orgánica, Facultad de Ciencias Químicas; Universidad Nacional de Córdoba; Haya de la Torre y Medina Allende, Ciudad Universitaria X5000HUA Córdoba Argentina
| | - Rita H. de Rossi
- Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC), CONICET and Departamento de Química Orgánica, Facultad de Ciencias Químicas; Universidad Nacional de Córdoba; Haya de la Torre y Medina Allende, Ciudad Universitaria X5000HUA Córdoba Argentina
| | - Elba I. Buján
- Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC), CONICET and Departamento de Química Orgánica, Facultad de Ciencias Químicas; Universidad Nacional de Córdoba; Haya de la Torre y Medina Allende, Ciudad Universitaria X5000HUA Córdoba Argentina
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Affiliation(s)
- Jorge Morales
- a Department of Physical Chemistry, Faculty of Sciences , University of Vigo , 32004 , Ourense , Spain
| | - José A. Manso
- a Department of Physical Chemistry, Faculty of Sciences , University of Vigo , 32004 , Ourense , Spain
| | - Juan C. Mejuto
- a Department of Physical Chemistry, Faculty of Sciences , University of Vigo , 32004 , Ourense , Spain
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Jiang BP, Guo DS, Liu Y. Reversible and Selective Sensing of Aniline Vapor by Perylene-Bridged Bis(cyclodextrins) Assembly. J Org Chem 2011; 76:6101-7. [DOI: 10.1021/jo2007576] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Bang-Ping Jiang
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Dong-Sheng Guo
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Yu Liu
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P. R. China
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Flores-Morales P, Diema C, Vilaseca M, Estelrich J, Luque FJ, Gutiérrez-Oliva S, Toro-Labbé A, Silva E. Enhanced reactivity of Lys182 explains the limited efficacy of biogenic amines in preventing the inactivation of glucose-6-phosphate dehydrogenase by methylglyoxal. Bioorg Med Chem 2011; 19:1613-22. [DOI: 10.1016/j.bmc.2011.01.044] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2010] [Revised: 01/14/2011] [Accepted: 01/21/2011] [Indexed: 11/25/2022]
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Zhao Y, Yang YC, Shi H, Zhao Y, Chi SM, Zhu HY, Huang R. Molecular Recognition of Bridged Bis(β-cyclodextrin) Linked by the 4,4′-Diaminodiphenyl Sulfone Tether with Non-aromatic Oligopeptides. J SOLUTION CHEM 2010. [DOI: 10.1007/s10953-010-9564-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Astray G, Mejuto J, Morales J, Rial-Otero R, Simal-Gándara J. Factors controlling flavors binding constants to cyclodextrins and their applications in foods. Food Res Int 2010. [DOI: 10.1016/j.foodres.2010.02.017] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Cabaleiro-Lago C, García-Río L, Hervés P, Mejuto JC, Pérez-Juste J. Characterization of Alkane Diol-CD Complexes. Acid Denitrosation of N-Methyl-N-Nitroso-p-Toluenesulphonamide as a Chemical Probe. J INCL PHENOM MACRO 2006. [DOI: 10.1007/s10847-005-7379-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Andrés GO, Silva OF, de Rossi RH. Hydrolysis of aryl hydrogen maleate esters mediated by cyclodextrins Effect on the intramolecular catalysis. CAN J CHEM 2005. [DOI: 10.1139/v05-144] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Kinetic studies of the hydrolysis of Z-aryl hydrogen maleates (Z = H, p-CH3, m-CH3, p-Cl, m-Cl) were carried out in the presence and absence of hydroxypropyl-β-cyclodextrin (HPCD) at variable pH from 1.00 to 3.00. The reaction involves the formation of maleic anhydride as an intermediate and the rate of its formation is strongly dependent on the pH. This is because the neighboring carboxylate group is a better catalyst than the carboxylic group. The rate constant for the formation of maleic anhydride decreases as the HPCD concentration increases in a nonlinear fashion. The results were interpreted in terms of the formation of a 1:1 inclusion complex of the esters with HPCD. The neutral (HA) and anionic (A) species of the substrate have different association constants (K[Formula: see text] and K[Formula: see text]). In all cases studied,K[Formula: see text] is higher than K[Formula: see text] for the same substrate. This difference is responsible for a decrease in the amount of the anionic substrate (reactive species) in the presence of HPCD, which results in a diminution of the observed rate constant. Besides, the rate constant for the reaction of the complexed substrate is smaller than that in the bulk solution indicating that the transition state of the cyclodextrin mediated reaction is less stabilized than the anionic substrate. The values of ΔΔGare almost independent of the substituent on the aryl ring and range within 0.48 and 1.05 kcal mol1(1 cal = 4.184 J). There is no correlation between KTSand the association constant of the substrate indicating that the factors stabilizing the transition state are different from those that stabilize the substrate. Key words: cyclodextrins, intramolecular catalysis, hydrolysis, inhibition.
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Thermodynamics of binding between α- and β-cyclodextrins and some p-nitro-aniline derivatives: reconsidering the enthalpy–entropy compensation effect. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.07.079] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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