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Hall BW, Bingman CA, Fox BG, Noguera DR, Donohue TJ. A broad specificity β-propeller enzyme from Rhodopseudomonas palustris that hydrolyzes many lactones including γ-valerolactone. J Biol Chem 2023; 299:102782. [PMID: 36502920 PMCID: PMC9843451 DOI: 10.1016/j.jbc.2022.102782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 11/30/2022] [Accepted: 12/03/2022] [Indexed: 12/13/2022] Open
Abstract
Lactones are prevalent in biological and industrial settings, yet there is a lack of information regarding enzymes used to metabolize these compounds. One compound, γ-valerolactone (GVL), is used as a solvent to dissolve plant cell walls into sugars and aromatic molecules for subsequent microbial conversion to fuels and chemicals. Despite the promise of GVL as a renewable solvent for biomass deconstruction, residual GVL can be toxic to microbial fermentation. Here, we identified a Ca2+-dependent enzyme from Rhodopseudomonas palustris (Rpa3624) and showed that it can hydrolyze aliphatic and aromatic lactones and esters, including GVL. Maximum-likelihood phylogenetic analysis of other related lactonases with experimentally determined substrate preferences shows that Rpa3624 separates by sequence motifs into a subclade with preference for hydrophobic substrates. Additionally, we solved crystal structures of this β-propeller enzyme separately with either phosphate, an inhibitor, or a mixture of GVL and products to define an active site where calcium-bound water and calcium-bound aspartic and glutamic acid residues make close contact with substrate and product. Our kinetic characterization of WT and mutant enzymes combined with structural insights inform a reaction mechanism that centers around activation of a calcium-bound water molecule promoted by general base catalysis and close contacts with substrate and a potential intermediate. Similarity of Rpa3624 with other β-propeller lactonases suggests this mechanism may be relevant for other members of this emerging class of versatile catalysts.
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Affiliation(s)
- Benjamin W Hall
- Laboratory of Genetics, University of Wisconsin-Madison, Madison, Wisconsin, USA; Department of Energy Great Lakes Bioenergy Research Center, Madison, Wisconsin, USA; Wisconsin Energy Institute, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Craig A Bingman
- Department of Energy Great Lakes Bioenergy Research Center, Madison, Wisconsin, USA; Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Brian G Fox
- Department of Energy Great Lakes Bioenergy Research Center, Madison, Wisconsin, USA; Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Daniel R Noguera
- Department of Energy Great Lakes Bioenergy Research Center, Madison, Wisconsin, USA; Wisconsin Energy Institute, University of Wisconsin-Madison, Madison, Wisconsin, USA; Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Timothy J Donohue
- Department of Energy Great Lakes Bioenergy Research Center, Madison, Wisconsin, USA; Wisconsin Energy Institute, University of Wisconsin-Madison, Madison, Wisconsin, USA; Department of Bacteriology, University of Wisconsin-Madison, Madison, Wisconsin, USA.
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Feng K, Qi N, Jin Q, Gao L, Zhang J, Tian Q. Cloning and characterization of four enzymes responsible for cyclohexylamine degradation from Paenarthrobacter sp. TYUT067. Protein Expr Purif 2022; 198:106136. [PMID: 35760252 DOI: 10.1016/j.pep.2022.106136] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Revised: 06/11/2022] [Accepted: 06/22/2022] [Indexed: 01/25/2023]
Abstract
Paenarthrobacter sp. TYUT067 is a soil bacterium that can degrade and use cyclohexylamine as the sole source of carbon and energy. However, the responsible enzymes involved in cyclohexylamine degradation by TYUT067 have not been cloned and characterized in detail yet. In this study, four possible cyclohexylamine degradation genes, one cyclohexylamine oxidase (Pachao), two cyclohexanone monooxygenases (Pachms) and one lactone hydrolase (Pamlh) were successfully cloned and heterologous expressed in Escherichia coli T7 host cells. The four enzymes were purified and characterized. The optimal pH and temperature of the purified enzymes toward their own substrates were 7.0 (PaCHAO), 8.0 (PaCHM1), 9.0 (PaCHM2 and PaMLH) and 30 °C (PaCHAO and PaMLH), 40 °C (PaCHM2) and 45 °C (PaCHM1), respectively, with KM of 1.1 mM (PaCHAO), 0.1 mM (PaCHM1), 0.1 mM (PaCHM2) and 0.8 mM (PaMLH), and yielding a catalytic efficiency kcat/KM of 16.1 mM-1 s-1 (PaCHAO), 1.0 mM-1 s-1 (PaCHM1), 5.0 mM-1 s-1 (PaCHM2) and 124.4 mM-1 s-1 (PaMLH). In vitro mimicking the cyclohexylamine degradation pathway was conducted by using the combined three cyclohexylamine degradation enzymes (PaCHAO, PaCHM2 and PaMLH) with 10-50 mM cyclohexylamine, 100% conversion of cyclohexylamine could be finished within 12 h without any detected intermediates. The current study confirmed the enzymes responsible for cyclohexylamine degradation in TYUT067 for the first time, provide basic information for further investigation and application of these specific enzymes in pollution control.
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Affiliation(s)
- Kaiqing Feng
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, PR China
| | - Ning Qi
- Department of Biological and Pharmaceutical Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, PR China
| | - Qi Jin
- Department of Biological and Pharmaceutical Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, PR China
| | - Lili Gao
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, PR China.
| | - Jiandong Zhang
- Department of Biological and Pharmaceutical Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, PR China
| | - Qi Tian
- College of Civil Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, PR China
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Shimotori Y, Hoshi M, Seki S, Osanai T, Okabe H, Ikeda Y, Miyakoshi T. Preparation of optically pure δ-lactones using diastereomeric resolution with amino acid as resolving agent. J Oleo Sci 2015; 64:75-90. [PMID: 25742924 DOI: 10.5650/jos.ess14124] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Synthesis of optically pure δ-lactones by diastereomeric resolution was investigated. Amino acid derivatives, which can be obtained at a relatively low cost, were used as resolving agents. Six optically pure δ-lactones were efficiently synthesized using Cbz-L-alanine without other expensive resolving agents. Both enantiomers of δ-lactone obtained had over 98% enantiomeric excesses. This diastereomeric resolution is very efficient for the preparation of optically pure δ-lactones.
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Affiliation(s)
- Yasutaka Shimotori
- Department of Biotechnology and Environmental Chemistry, Kitami Institute of Technology
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Characterization of CpdC, a large-ring lactone-hydrolyzing enzyme from Pseudomonas sp. strain HI-70, and its use as a fusion tag facilitating overproduction of proteins in Escherichia coli. Appl Environ Microbiol 2013; 79:7091-100. [PMID: 24038681 DOI: 10.1128/aem.02435-13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
There are few entries of carbon-carbon bond hydrolases (EC 3.7.1.-) in the ExPASy database. In microbes, these enzymes play an essential role in the metabolism of alicyclic or aromatic compounds as part of the global carbon cycle. CpdC is a ω-pentadecalactone hydrolase derived from the degradation pathway of cyclopentadecanol or cyclopentadecanone by Pseudomonas sp. strain HI-70. CpdC was purified to homogeneity and characterized. It is active as a dimer of 56,000 Da with a subunit molecular mass of 33,349. Although CpdC has the highest activity and reaction rate (kcat) toward ω-pentadecalactone, its catalytic efficiency favors lauryl lactone as a substrate. The melting temperature (Tm) of CpdC was estimated to be 50.9 ± 0.1°C. The half-life of CpdC at 35°C is several days. By virtue of its high level of expression in Escherichia coli, the intact CpdC-encoding gene and progressive 3'-end deletions were employed in the construction of a series of fusion plasmid system. Although we found them in inclusion bodies, proof-of-concept of overproduction of three microbial cutinases of which the genes were otherwise expressed poorly or not at all in E. coli was demonstrated. On the other hand, two antigenic proteins, azurin and MPT63, were readily produced in soluble form.
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Biocatalytic Properties of a Recombinant Fusarium proliferatum Lactonase with Significantly Enhanced Production by Optimal Expression in Escherichia coli. Appl Biochem Biotechnol 2009; 162:744-56. [DOI: 10.1007/s12010-009-8819-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2009] [Accepted: 10/11/2009] [Indexed: 11/26/2022]
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Kataoka M, Honda K, Sakamoto K, Shimizu S. Microbial enzymes involved in lactone compound metabolism and their biotechnological applications. Appl Microbiol Biotechnol 2007; 75:257-66. [PMID: 17333168 DOI: 10.1007/s00253-007-0896-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2006] [Revised: 02/15/2007] [Accepted: 02/19/2007] [Indexed: 10/23/2022]
Abstract
Lactone compounds are widely distributed in nature and play important roles in organisms. These compounds are synthesized and metabolized enzymatically in vivo; however, detailed investigation of these enzymes lags behind that of other common enzymes. In this paper, recent work on the enzymes involved in the metabolism of lactone compounds will be reviewed. In particular, fundamental and application studies on lactonases and Baeyer-Villiger monooxgenases of microbial origin are described.
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Affiliation(s)
- Michihiko Kataoka
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
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Hwang BY, Lee HB, Kim YG, Kim BG. Lipase-catalyzed kinetic resolutions of racemic β- and γ-thiolactones. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcatb.2006.05.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Iwaki H, Hasegawa Y, Wang S, Kayser MM, Lau PCK. Cloning and characterization of a gene cluster involved in cyclopentanol metabolism in Comamonas sp. strain NCIMB 9872 and biotransformations effected by Escherichia coli-expressed cyclopentanone 1,2-monooxygenase. Appl Environ Microbiol 2002; 68:5671-84. [PMID: 12406764 PMCID: PMC129933 DOI: 10.1128/aem.68.11.5671-5684.2002] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2002] [Accepted: 08/23/2002] [Indexed: 11/20/2022] Open
Abstract
Cyclopentanone 1,2-monooxygenase, a flavoprotein produced by Pseudomonas sp. strain NCIMB 9872 upon induction by cyclopentanol or cyclopentanone (M. Griffin and P. W. Trudgill, Biochem. J. 129:595-603, 1972), has been utilized as a biocatalyst in Baeyer-Villiger oxidations. To further explore this biocatalytic potential and to discover new genes, we have cloned and sequenced a 16-kb chromosomal locus of strain 9872 that is herein reclassified as belonging to the genus COMAMONAS: Sequence analysis revealed a cluster of genes and six potential open reading frames designated and grouped in at least four possible transcriptional units as (orf11-orf10-orf9)-(cpnE-cpnD-orf6-cpnC)-(cpnR-cpnB-cpnA)-(orf3-orf4 [partial 3' end]). The cpnABCDE genes encode enzymes for the five-step conversion of cyclopentanol to glutaric acid catalyzed by cyclopentanol dehydrogenase, cyclopentanone 1,2-monooxygenase, a ring-opening 5-valerolactone hydrolase, 5-hydroxyvalerate dehydrogenase, and 5-oxovalerate dehydrogenase, respectively. Inactivation of cpnB by using a lacZ-Km(r) cassette resulted in a strain that was not capable of growth on cyclopentanol or cyclopentanone as a sole carbon and energy source. The presence of sigma(54)-dependent regulatory elements in front of the divergently transcribed cpnB and cpnC genes supports the notion that cpnR is a regulatory gene of the NtrC type. Knowledge of the nucleotide sequence of the cpn genes was used to construct isopropyl-beta-thio-D-galactoside-inducible clones of Escherichia coli cells that overproduce the five enzymes of the cpn pathway. The substrate specificities of CpnA and CpnB were studied in particular to evaluate the potential of these enzymes and establish the latter recombinant strain as a bioreagent for Baeyer-Villiger oxidations. Although frequently nonenantioselective, cyclopentanone 1,2-monooxygenase was found to exhibit a broader substrate range than the related cyclohexanone 1,2-monooxygenase from Acinetobacter sp. strain NCIMB 9871. However, in a few cases opposite enantioselectivity was observed between the two biocatalysts.
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Affiliation(s)
- Hiroaki Iwaki
- Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec H4P 2R2, Department of Physical Sciences, University of New Brunswick, Saint John, New Brunswick E2L 4L5, Canada, Department of Biotechnology, Faculty of Engineering and High Technology Research Center, Kansai University, Suita, Osaka 564-8680, Japan
| | - Yoshie Hasegawa
- Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec H4P 2R2, Department of Physical Sciences, University of New Brunswick, Saint John, New Brunswick E2L 4L5, Canada, Department of Biotechnology, Faculty of Engineering and High Technology Research Center, Kansai University, Suita, Osaka 564-8680, Japan
| | - Shaozhao Wang
- Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec H4P 2R2, Department of Physical Sciences, University of New Brunswick, Saint John, New Brunswick E2L 4L5, Canada, Department of Biotechnology, Faculty of Engineering and High Technology Research Center, Kansai University, Suita, Osaka 564-8680, Japan
| | - Margaret M. Kayser
- Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec H4P 2R2, Department of Physical Sciences, University of New Brunswick, Saint John, New Brunswick E2L 4L5, Canada, Department of Biotechnology, Faculty of Engineering and High Technology Research Center, Kansai University, Suita, Osaka 564-8680, Japan
| | - Peter C. K. Lau
- Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec H4P 2R2, Department of Physical Sciences, University of New Brunswick, Saint John, New Brunswick E2L 4L5, Canada, Department of Biotechnology, Faculty of Engineering and High Technology Research Center, Kansai University, Suita, Osaka 564-8680, Japan
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Khalameyzer V, Fischer I, Bornscheuer UT, Altenbuchner J. Screening, nucleotide sequence, and biochemical characterization of an esterase from Pseudomonas fluorescens with high activity towards lactones. Appl Environ Microbiol 1999; 65:477-82. [PMID: 9925571 PMCID: PMC91050 DOI: 10.1128/aem.65.2.477-482.1999] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A genomic library of Pseudomonas fluorescens DSM 50106 in a lambdaRESIII phage vector was screened in Escherichia coli K-12 for esterase activity by using alpha-naphthyl acetate and Fast Blue RR. A 3.2-kb DNA fragment was subcloned from an esterase-positive clone and completely sequenced. Esterase EstF1 was encoded by a 999-bp open reading frame (ORF) and exhibited significant amino acid sequence identity with members of the serine hydrolase family. The deduced amino acid sequences of two other C-terminal truncated ORFs exhibited homology to a cyclohexanone monooxygenase and an alkane hydroxylase. However, esterase activity was not induced by growing of P. fluorescens DSM 50106 in the presence of several cyclic ketones. The esterase gene was fused to a His tag and expressed in E. coli. The gene product was purified by zinc ion affinity chromatography and characterized. Detergents had to be added for purification, indicating that the enzyme was membrane bound or membrane associated. The optimum pH of the purified enzyme was 7.5, and the optimum temperature was 43 degreesC. The showed highest purified enzyme activities towards lactones. The activity increased from gamma-butyrolactone (18.1 U/mg) to epsilon-caprolactone (21.8 U/mg) to delta-valerolactone (36.5 U/mg). The activities towards the aliphatic esters were significantly lower; the only exception was the activity toward ethyl caprylate, which was the preferred substrate.
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Affiliation(s)
- V Khalameyzer
- Institute for Technical Biochemistry, University of Stuttgart, 70569 Stuttgart, Germany
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