1
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Wu P, Luo D, Wang Y, Shang X, Wang B, Deng X, Yuan J. Biosynthesis of Diverse Ephedra-Type Alkaloids via a Newly Identified Enzymatic Cascade. BIODESIGN RESEARCH 2024; 6:0048. [PMID: 39228751 PMCID: PMC11371322 DOI: 10.34133/bdr.0048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2024] [Accepted: 08/11/2024] [Indexed: 09/05/2024] Open
Abstract
Ephedra-type alkaloids represent a large class of natural and synthetic phenylpropanolamine molecules with great pharmaceutical values. However, the existing methods typically rely on chemical approaches to diversify the N-group modification of Ephedra-type alkaloids. Herein, we report a 2-step enzymatic assembly line for creating structurally diverse Ephedra-type alkaloids to replace the conventional chemical modification steps. We first identified a new carboligase from Bacillus subtilis (BsAlsS, acetolactate synthase) as a robust catalyst to yield different phenylacetylcarbinol (PAC) analogs from diverse aromatic aldehydes with near 100% conversions. Subsequently, we screened imine reductases (IREDs) for the reductive amination of PAC analogs. It was found that IRG02 from Streptomyces albidoflavus had good activities with conversions ranging from 37% to 84% for the reductive alkylamination with diverse amine partners such as allylamine, propargylamine, and cyclopropylamine. Overall, 3 new bio-modifications at the N-group of Ephedra-type alkaloids were established. Taken together, our work lays a foundation for the future implementation of biocatalysis for synthesizing structurally diverse Ephedra-type alkaloids with potential new pharmaceutical applications.
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Affiliation(s)
- Peiling Wu
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences,
Faculty of Medicine and Life Sciences, Xiamen University, Fujian 361102, China
| | - Ding Luo
- College of Chemistry and Chemical Engineering,
Xiamen University, Fujian 361105, China
| | - Yuezhou Wang
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences,
Faculty of Medicine and Life Sciences, Xiamen University, Fujian 361102, China
| | - Xiaoxu Shang
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences,
Faculty of Medicine and Life Sciences, Xiamen University, Fujian 361102, China
| | - Binju Wang
- College of Chemistry and Chemical Engineering,
Xiamen University, Fujian 361105, China
| | - Xianming Deng
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences,
Faculty of Medicine and Life Sciences, Xiamen University, Fujian 361102, China
| | - Jifeng Yuan
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences,
Faculty of Medicine and Life Sciences, Xiamen University, Fujian 361102, China
- Shenzhen Research Institute of Xiamen University, Shenzhen 518057, China
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2
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Smith MA, Kang RJD, Kumar R, Roy B, Gaunt MJ. Modular synthesis of α-branched secondary alkylamines via visible-light-mediated carbonyl alkylative amination. Chem Sci 2024:d4sc03916e. [PMID: 39184289 PMCID: PMC11342158 DOI: 10.1039/d4sc03916e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2024] [Accepted: 08/16/2024] [Indexed: 08/27/2024] Open
Abstract
The development of methods for the assembly of secondary α-alkyl amines remains a central challenge to chemical synthesis because of their critical importance in modulating the physical properties of biologically active molecules. Despite decades of intensive research, chemists still rely on selective N-alkylation and carbonyl reductive amination to make most amine products. Here we report the further evolution of a carbonyl alkylative amination process that, for the first time, brings together primary amines, aldehydes and alkyl iodides in a visible-light-mediated multicomponent coupling reaction for the synthesis of a wide range of α-branched secondary alkylamines. In addition to exploring the tolerance and limitations in each reaction component, we also report preliminary applications to the telescoped synthesis of α-branched N-heterocycles and an N-alkylation protocol that is selective for primary over cyclic secondary amines. Our data support a mechanism involving addition of an alkyl radical to an uncharged alkyl imine which, to the best of our knowledge, has not previously been described. We believe that this method will enable practitioners of synthetic chemistry in academic and industrial settings to approach the synthesis of these important molecules in a manner that is streamlined compared to established approaches.
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Affiliation(s)
- Milo A Smith
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Ryan J D Kang
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Roopender Kumar
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Biswarup Roy
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Matthew J Gaunt
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK
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3
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Huang A, Zhang X, Yang Y, Shi C, Zhang B, Tuo X, Shen P, Jiao X, Zhang N. Biocatalytic Synthesis of Ruxolitinib Intermediate via Engineered Imine Reductase. J Org Chem 2024; 89:11446-11454. [PMID: 39113180 DOI: 10.1021/acs.joc.4c01119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/17/2024]
Abstract
An enzyme catalyzed strategy for the synthesis of a chiral hydrazine from 3-cyclopentyl-3-oxopropanenitrile 5 and hydrazine hydrate 2 is presented. An imine reductase (IRED) from Streptosporangium roseum was identified to catalyze the reaction between 3-cyclopentyl-3-oxopropanenitrile 5 and hydrazine hydrate 2 to produce trace amounts of (R)-3-cyclopentyl-3-hydrazineylpropanenitrile 4. We employed a 2-fold approach to optimize the catalytic performance of this enzyme. First, a transition state analogue (TSA) model was constructed to illuminate the enzyme-substrate interactions. Subsequently, the Enzyme_design and Funclib methods were utilized to predict mutants for experimental evaluation. Through three rounds of site-directed mutagenesis, site saturation mutagenesis, and combinatorial mutagenesis, we obtained mutant M6 with a yield of 98% and an enantiomeric excess (ee) of 99%. This study presents an effective method for constructing a hydrazine derivative via IRED-catalyzed reductive amination of ketone and hydrazine. Furthermore, it provides a general approach for constructing suitable enzymes, starting from nonreactive enzymes and gradually enhancing their catalytic activity through active site modifications.
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Affiliation(s)
- Aiping Huang
- Center of Biosynthesis Technology, Asymchem Life Science (Tianjin) Co, Ltd, Tianjin 300457, P.R. China
| | - Xuewen Zhang
- Center of Biosynthesis Technology, Asymchem Life Science (Tianjin) Co, Ltd, Tianjin 300457, P.R. China
| | - Yiming Yang
- Center of Biosynthesis Technology, Asymchem Life Science (Tianjin) Co, Ltd, Tianjin 300457, P.R. China
| | - Chengcheng Shi
- Center of Biosynthesis Technology, Asymchem Life Science (Tianjin) Co, Ltd, Tianjin 300457, P.R. China
| | - Bifei Zhang
- Center of Biosynthesis Technology, Asymchem Life Science (Tianjin) Co, Ltd, Tianjin 300457, P.R. China
| | - Xinkun Tuo
- Center of Biosynthesis Technology, Asymchem Life Science (Tianjin) Co, Ltd, Tianjin 300457, P.R. China
| | - Peili Shen
- Center of Biosynthesis Technology, Asymchem Life Science (Tianjin) Co, Ltd, Tianjin 300457, P.R. China
| | - Xuecheng Jiao
- Center of Biosynthesis Technology, Asymchem Life Science (Tianjin) Co, Ltd, Tianjin 300457, P.R. China
| | - Na Zhang
- Center of Biosynthesis Technology, Asymchem Life Science (Tianjin) Co, Ltd, Tianjin 300457, P.R. China
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4
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Daniel-Ivad P, Ryan KS. New reactions by pyridoxal phosphate-dependent enzymes. Curr Opin Chem Biol 2024; 81:102472. [PMID: 38815536 DOI: 10.1016/j.cbpa.2024.102472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Revised: 05/02/2024] [Accepted: 05/08/2024] [Indexed: 06/01/2024]
Abstract
Pyridoxal phosphate (PLP) is a cofactor that is widely employed in enzymology. This pyridine-containing cofactor can be used for reactions ranging from transaminations to oxidations. The catalytic versatility can be understood by considering the chemical features of this cofactor. In recent years, exciting new reactions involving PLP have been discovered in natural products biosynthesis, upending our understanding of what this cofactor is capable of. Here we review some of the most exciting PLP-dependent reactions from the last five years.
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Affiliation(s)
- Phillip Daniel-Ivad
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Katherine S Ryan
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada.
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5
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Vikhrankar SS, Satbhai S, Kulkarni P, Ranbhor R, Ramakrishnan V, Kodgire P. Enzymatic Routes for Chiral Amine Synthesis: Protein Engineering and Process Optimization. Biologics 2024; 18:165-179. [PMID: 38948006 PMCID: PMC11214570 DOI: 10.2147/btt.s446712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Accepted: 06/14/2024] [Indexed: 07/02/2024]
Abstract
Chiral amines are essential motifs in pharmaceuticals, agrochemicals, and specialty chemicals. While traditional chemical routes to chiral amines often lack stereoselectivity and require harsh conditions, biocatalytic methods using engineered enzymes can offer high efficiency and selectivity under sustainable conditions. This review discusses recent advances in protein engineering of transaminases, oxidases, and other enzymes to improve catalytic performance. Strategies such as directed evolution, immobilization, and computational redesign have expanded substrate scope and enhanced efficiency. Furthermore, process optimization guided by techno-economic assessments has been crucial for establishing viable biomanufacturing routes. Combining state-of-the-art enzyme engineering with multifaceted process development will enable scalable, economical enzymatic synthesis of diverse chiral amine targets.
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Affiliation(s)
| | | | | | | | - Vibin Ramakrishnan
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India
| | - Prashant Kodgire
- Biosciences and Biomedical Engineering, Indian Institute of Technology Indore, Indore, MP, India
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6
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Li X, Hu Y, Bailey JD, Lipshutz BH. Impact of Nonionic Surfactants on Reactions of IREDs. Applications to Tandem Chemoenzymatic Sequences in Water. Org Lett 2024; 26:2778-2783. [PMID: 37883080 DOI: 10.1021/acs.orglett.3c02790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2023]
Abstract
The influence of added surfactant to aqueous reaction mixtures containing various IREDs has been determined. Just the presence of a nonionic surfactant tends to increase both rates and extent of conversion to the targeted amines. The latter can be as much as >40% relative to buffer alone. Several tandem sequences featuring several steps that combine use of an IRED together with various types of chemocatalysis are also presented, highlighting the opportunities for utilizing chemoenzymatic catalysis, all in water.
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Affiliation(s)
- Xiaohan Li
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Yuting Hu
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - J Daniel Bailey
- Process Chemistry Development, Takeda Pharmaceuticals, Cambridge, Massachusetts 02139, United States
| | - Bruce H Lipshutz
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, California 93106, United States
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7
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Phelps J, Kumar R, Robinson JD, Chu JCK, Flodén NJ, Beaton S, Gaunt MJ. Multicomponent Synthesis of α-Branched Amines via a Zinc-Mediated Carbonyl Alkylative Amination Reaction. J Am Chem Soc 2024; 146:9045-9062. [PMID: 38488310 PMCID: PMC10996026 DOI: 10.1021/jacs.3c14037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 02/09/2024] [Accepted: 02/20/2024] [Indexed: 03/21/2024]
Abstract
Methods for the synthesis of α-branched alkylamines are important due to their ubiquity in biologically active molecules. Despite the development of many methods for amine preparation, C(sp3)-rich nitrogen-containing compounds continue to pose challenges for synthesis. While carbonyl reductive amination (CRA) between ketones and alkylamines is the cornerstone method for α-branched alkylamine synthesis, it is sometimes limited by the sterically demanding condensation step between dialkyl ketones and amines and the more restricted availability of ketones compared to aldehydes. We recently reported a "higher-order" variant of this transformation, carbonyl alkylative amination (CAA), which utilized a halogen atom transfer (XAT)-mediated radical mechanism, enabling the streamlined synthesis of complex α-branched alkylamines. Despite the efficacy of this visible-light-driven approach, it displayed scalability issues, and competitive reductive amination was a problem for certain substrate classes, limiting applicability. Here, we report a change in the reaction regime that expands the CAA platform through the realization of an extremely broad zinc-mediated CAA reaction. This new strategy enabled elimination of competitive CRA, simplified purification, and improved reaction scope. Furthermore, this new reaction harnessed carboxylic acid derivatives as alkyl donors and facilitated the synthesis of α-trialkyl tertiary amines, which cannot be accessed via CRA. This Zn-mediated CAA reaction can be carried out at a variety of scales, from a 10 μmol setup in microtiter plates enabling high-throughput experimentation, to the gram-scale synthesis of medicinally-relevant compounds. We believe that this transformation enables robust, efficient, and economical access to α-branched alkylamines and provides a viable alternative to the current benchmark methods.
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Affiliation(s)
| | | | | | | | - Nils J. Flodén
- Yusuf Hamied Department of
Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
| | - Sarah Beaton
- Yusuf Hamied Department of
Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
| | - Matthew J. Gaunt
- Yusuf Hamied Department of
Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
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8
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Qiao L, Zhang J, Jiang Y, Ma B, Chen H, Gao P, Zhang P, Wang A, Sheldon RA. Near-infrared light-driven asymmetric photolytic reduction of ketone using inorganic-enzyme hybrid biocatalyst. Int J Biol Macromol 2024; 264:130612. [PMID: 38447845 DOI: 10.1016/j.ijbiomac.2024.130612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 02/18/2024] [Accepted: 03/02/2024] [Indexed: 03/08/2024]
Abstract
Effective photolytic regeneration of the NAD(P)H cofactor in enzymatic reductions is an important and elusive goal in biocatalysis. It can, in principle, be achieved using a near-infrared light (NIR) driven artificial photosynthesis system employing H2O as the sacrificial reductant. To this end we utilized TiO2/reduced graphene quantum dots (r-GQDs), combined with a novel rhodium electron mediator, to continuously supply NADPH in situ for aldo-keto reductase (AKR) mediated asymmetric reductions under NIR irradiation. This upconversion system, in which the Ti-O-C bonds formed between r-GQDs and TiO2 enabled efficient interfacial charge transfer, was able to regenerate NADPH efficiently in 64 % yield in 105 min. Based on this, the pharmaceutical intermediate (R)-1-(3,5-bis(trifluoromethyl)phenyl)ethan-1-ol was obtained, in 84 % yield and 99.98 % ee, by reduction of the corresponding ketone. The photo-enzymatic system is recyclable with a polymeric electron mediator, which maintained 66 % of its original catalytic efficiency and excellent enantioselectivity (99.9 % ee) after 6 cycles.
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Affiliation(s)
- Li Qiao
- Key Laboratory of Organosilicon Chemistry and Materials Technology, Ministry of Education, College of Materials Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, Zhejiang, China
| | - Jing Zhang
- Key Laboratory of Organosilicon Chemistry and Materials Technology, Ministry of Education, College of Materials Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, Zhejiang, China
| | - Yongjian Jiang
- Key Laboratory of Organosilicon Chemistry and Materials Technology, Ministry of Education, College of Materials Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, Zhejiang, China
| | - Bianqin Ma
- Key Laboratory of Organosilicon Chemistry and Materials Technology, Ministry of Education, College of Materials Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, Zhejiang, China
| | - Haomin Chen
- Key Laboratory of Organosilicon Chemistry and Materials Technology, Ministry of Education, College of Materials Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, Zhejiang, China
| | - Peng Gao
- Key Laboratory of Organosilicon Chemistry and Materials Technology, Ministry of Education, College of Materials Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, Zhejiang, China
| | - Pengfei Zhang
- Key Laboratory of Organosilicon Chemistry and Materials Technology, Ministry of Education, College of Materials Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, Zhejiang, China
| | - Anming Wang
- Key Laboratory of Organosilicon Chemistry and Materials Technology, Ministry of Education, College of Materials Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, Zhejiang, China.
| | - Roger A Sheldon
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, PO Wits, 2050 Johannesburg, South Africa; Department of Biotechnology, Section BOC, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, the Netherlands.
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9
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Thorpe T, Marshall JR, Turner NJ. Multifunctional Biocatalysts for Organic Synthesis. J Am Chem Soc 2024; 146:7876-7884. [PMID: 38489244 PMCID: PMC10979396 DOI: 10.1021/jacs.3c09542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 02/13/2024] [Accepted: 02/15/2024] [Indexed: 03/17/2024]
Abstract
Biocatalysis is becoming an indispensable tool in organic synthesis due to high enzymatic catalytic efficiency as well as exquisite chemo- and stereoselectivity. Some biocatalysts display great promiscuity including a broad substrate scope as well as the ability to catalyze more than one type of transformation. These promiscuous activities have been applied individually to efficiently access numerous valuable target molecules. However, systems in which enzymes possessing multiple different catalytic activities are applied in the synthesis are less well developed. Such multifunctional biocatalysts (MFBs) would simplify chemical synthesis by reducing the number of operational steps and enzyme count, as well as simplifying the sequence space that needs to be engineered to develop an efficient biocatalyst. In this Perspective, we highlight recently reported MFBs focusing on their synthetic utility and mechanism. We also offer insight into their origin as well as comment on potential strategies for their discovery and engineering.
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Affiliation(s)
- Thomas
W. Thorpe
- Department
of Chemistry, University of Manchester,
Manchester Institute of Biotechnology, 131 Princess Street, Manchester, United Kingdom, M1
7DN
| | - James R. Marshall
- Department
of Chemistry, University of Manchester,
Manchester Institute of Biotechnology, 131 Princess Street, Manchester, United Kingdom, M1
7DN
| | - Nicholas J. Turner
- Department
of Chemistry, University of Manchester,
Manchester Institute of Biotechnology, 131 Princess Street, Manchester, United Kingdom, M1
7DN
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10
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Roth S, Niese R, Müller M, Hall M. Redox Out of the Box: Catalytic Versatility Across NAD(P)H-Dependent Oxidoreductases. Angew Chem Int Ed Engl 2024; 63:e202314740. [PMID: 37924279 DOI: 10.1002/anie.202314740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Revised: 11/02/2023] [Accepted: 11/03/2023] [Indexed: 11/06/2023]
Abstract
The asymmetric reduction of double bonds using NAD(P)H-dependent oxidoreductases has proven to be an efficient tool for the synthesis of important chiral molecules in research and on industrial scale. These enzymes are commercially available in screening kits for the reduction of C=O (ketones), C=C (activated alkenes), or C=N bonds (imines). Recent reports, however, indicate that the ability to accommodate multiple reductase activities on distinct C=X bonds occurs in different enzyme classes, either natively or after mutagenesis. This challenges the common perception of highly selective oxidoreductases for one type of electrophilic substrate. Consideration of this underexplored potential in enzyme screenings and protein engineering campaigns may contribute to the identification of complementary biocatalytic processes for the synthesis of chiral compounds. This review will contribute to a global understanding of the promiscuous behavior of NAD(P)H-dependent oxidoreductases on C=X bond reduction and inspire future discoveries with respect to unconventional biocatalytic routes in asymmetric synthesis.
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Affiliation(s)
- Sebastian Roth
- Institute of Chemistry, University of Graz, Heinrichstrasse 28, 8010, Graz, Austria
| | - Richard Niese
- Institute of Pharmaceutical Sciences, University of Freiburg, Albertstrasse 25, 79104, Freiburg, Germany
| | - Michael Müller
- Institute of Pharmaceutical Sciences, University of Freiburg, Albertstrasse 25, 79104, Freiburg, Germany
| | - Mélanie Hall
- Institute of Chemistry, University of Graz, Heinrichstrasse 28, 8010, Graz, Austria
- BioHealth, Field of Excellence, University of Graz, 8010, Graz, Austria
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11
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Daniel-Ivad P, Ryan KS. An imine reductase that captures reactive intermediates in the biosynthesis of the indolocarbazole reductasporine. J Biol Chem 2024; 300:105642. [PMID: 38199566 PMCID: PMC10851217 DOI: 10.1016/j.jbc.2024.105642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 12/21/2023] [Accepted: 12/31/2023] [Indexed: 01/12/2024] Open
Abstract
Imine reductases (IREDs) and reductive aminases have been used in the synthesis of chiral amine products for drug manufacturing; however, little is known about their biological contexts. Here we employ structural studies and site-directed mutagenesis to interrogate the mechanism of the IRED RedE from the biosynthetic pathway to the indolocarbazole natural product reductasporine. Cocrystal structures with the substrate-mimic arcyriaflavin A reveal an extended active site cleft capable of binding two indolocarbazole molecules. Site-directed mutagenesis of a conserved aspartate in the primary binding site reveals a new role for this residue in anchoring the substrate above the NADPH cofactor. Variants targeting the secondary binding site greatly reduce catalytic efficiency, while accumulating oxidized side-products. As indolocarbazole biosynthetic intermediates are susceptible to spontaneous oxidation, we propose the secondary site acts to protect against autooxidation, and the primary site drives catalysis through precise substrate orientation and desolvation effects. The structure of RedE with its extended active site can be the starting point as a new scaffold for engineering IREDs and reductive aminases to intercept large substrates relevant to industrial applications.
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Affiliation(s)
- Phillip Daniel-Ivad
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Katherine S Ryan
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada.
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12
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Wu K, Yan J, Liu Q, Wang X, Wu P, Cao Y, Lu X, Xu Y, Huang J, Shao L. Computational design of an imine reductase: mechanism-guided stereoselectivity reversion and interface stabilization. Chem Sci 2024; 15:1431-1440. [PMID: 38274081 PMCID: PMC10806680 DOI: 10.1039/d3sc04636b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Accepted: 12/12/2023] [Indexed: 01/27/2024] Open
Abstract
Imine reductases (IREDs) are important biocatalysts in the asymmetric synthesis of chiral amines. However, a detailed understanding of the stereocontrol mechanism of IRED remains incomplete, making the design of IRED for producing the desired amine enantiomers challenging. In this study, we investigated the stereoselective catalytic mechanism and designed an (R)-stereoselective IRED from Paenibacillus mucilaginosus (PmIR) using pharmaceutically relevant 2-aryl-substituted pyrrolines as substrates. A putative mechanism for controlling stereoselectivity was proposed based on the crucial role of electrostatic interactions in controlling iminium cation orientation and employed to achieve complete inversion of stereoselectivity in PmIR using computational design. The variant PmIR-Re (Q138M/P140M/Y187E/Q190A/D250M/R251N) exhibited opposite (S)-stereoselectivity, with >96% enantiomeric excess (ee) towards tested 2-aryl-substituted pyrrolines. Computational tools were employed to identify stabilizing mutations at the interface between the two subunits. The variant PmIR-6P (P140A/Q190S/R251N/Q217E/A257R/T277M) showed a nearly 5-fold increase in activity and a 12 °C increase in melting temperature. The PmIR-6P successfully produced (R)-2-(2,5-difluorophenyl)-pyrrolidine, a key chiral pharmaceutical intermediate, at a concentration of 400 mM with an ee exceeding 99%. This study provides insight into the stereocontrol elements of IREDs and demonstrates the potential of computational design for tailored stereoselectivity and thermal stability.
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Affiliation(s)
- Kai Wu
- School of Pharmacy, Shanghai University of Medicine & Health Sciences 279 Zhouzhu Highway, Pudong New Area Shanghai 201318 China
| | - Jinrong Yan
- College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science 333 Longteng Road Shanghai 201620 China
- State Key Laboratory of New Drug and Pharmaceutical Process, Shanghai Institute of Pharmaceutical Industry 285 Gebaini Rd. Shanghai 200040 China
| | - Qinde Liu
- School of Pharmacy, Shanghai University of Medicine & Health Sciences 279 Zhouzhu Highway, Pudong New Area Shanghai 201318 China
- Shanghai University of Traditional Chinese Medicine 1200 Cailun Road Shanghai 201203 China
| | - Xiaojing Wang
- School of Pharmacy, Shanghai University of Medicine & Health Sciences 279 Zhouzhu Highway, Pudong New Area Shanghai 201318 China
| | - Piaoru Wu
- School of Pharmacy, Shanghai University of Medicine & Health Sciences 279 Zhouzhu Highway, Pudong New Area Shanghai 201318 China
| | - Yiyang Cao
- School of Pharmacy, Shanghai University of Medicine & Health Sciences 279 Zhouzhu Highway, Pudong New Area Shanghai 201318 China
| | - Xiuhong Lu
- School of Pharmacy, Shanghai University of Medicine & Health Sciences 279 Zhouzhu Highway, Pudong New Area Shanghai 201318 China
| | - Yixin Xu
- School of Pharmacy, Shanghai University of Medicine & Health Sciences 279 Zhouzhu Highway, Pudong New Area Shanghai 201318 China
| | - Junhai Huang
- College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science 333 Longteng Road Shanghai 201620 China
- State Key Laboratory of New Drug and Pharmaceutical Process, Shanghai Institute of Pharmaceutical Industry 285 Gebaini Rd. Shanghai 200040 China
| | - Lei Shao
- School of Pharmacy, Shanghai University of Medicine & Health Sciences 279 Zhouzhu Highway, Pudong New Area Shanghai 201318 China
- State Key Laboratory of New Drug and Pharmaceutical Process, Shanghai Institute of Pharmaceutical Industry 285 Gebaini Rd. Shanghai 200040 China
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13
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Prout L, Hailes HC, Ward JM. Natural transaminase fusions for biocatalysis. RSC Adv 2024; 14:4264-4273. [PMID: 38298934 PMCID: PMC10829540 DOI: 10.1039/d3ra07081f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Accepted: 01/23/2024] [Indexed: 02/02/2024] Open
Abstract
Biocatalytic approaches are used widely for the synthesis of amines from abundant or low cost starting materials. This is a fast-developing field where novel enzymes and enzyme combinations emerge quickly to enable the production of new and complex compounds. Natural multifunctional enzymes represent a part of multi-step biosynthetic pathways that ensure a one-way flux of reactants. In vivo, they confer a selective advantage via increased reaction rates and chemical stability or prevention of toxicity from reactive intermediates. Here we report the identification and analysis of a natural transaminase fusion, PP_2782, from Pseudomonas putida KT2440, as well as three of its thermophilic homologs from Thermaerobacter marianensis, Thermaerobacter subterraneus, and Thermincola ferriacetica. Both the fusions and their truncated transaminase-only derivatives showed good activity with unsubstituted aliphatic and aromatic aldehydes and amines, as well as with a range of α-keto acids, and l-alanine, l-glutamate, and l-glutamine. Through structural similarity, the fused domain was recognised as the acyl-[acyl-carrier-protein] reductase that affects reductive chain release. These natural transaminase fusions could have a great potential for industrial applications.
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Affiliation(s)
- Luba Prout
- Department of Biochemical Engineering, University College London London WC1E 6BT UK
| | - Helen C Hailes
- Department of Chemistry, University College London 20 Gordon Street London WC1H 0AJ UK
| | - John M Ward
- Department of Biochemical Engineering, University College London London WC1E 6BT UK
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14
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Yuan B, Yang D, Qu G, Turner NJ, Sun Z. Biocatalytic reductive aminations with NAD(P)H-dependent enzymes: enzyme discovery, engineering and synthetic applications. Chem Soc Rev 2024; 53:227-262. [PMID: 38059509 DOI: 10.1039/d3cs00391d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2023]
Abstract
Chiral amines are pivotal building blocks for the pharmaceutical industry. Asymmetric reductive amination is one of the most efficient and atom economic methodologies for the synthesis of optically active amines. Among the various strategies available, NAD(P)H-dependent amine dehydrogenases (AmDHs) and imine reductases (IREDs) are robust enzymes that are available from various sources and capable of utilizing a broad range of substrates with high activities and stereoselectivities. AmDHs and IREDs operate via similar mechanisms, both involving a carbinolamine intermediate followed by hydride transfer from the co-factor. In addition, both groups catalyze the formation of primary and secondary amines utilizing both organic and inorganic amine donors. In this review, we discuss advances in developing AmDHs and IREDs as biocatalysts and focus on evolutionary history, substrate scope and applications of the enzymes to provide an outlook on emerging industrial biotechnologies of chiral amine production.
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Affiliation(s)
- Bo Yuan
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China.
- Key Laboratory of Engineering Biology for Low-Carbon Manufacturing, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, China
| | - Dameng Yang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China.
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China.
- Key Laboratory of Engineering Biology for Low-Carbon Manufacturing, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, China
| | - Nicholas J Turner
- Department of Chemistry, Manchester Institute of Biotechnology, University of Manchester, Manchester M1 7DN, UK.
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China.
- Key Laboratory of Engineering Biology for Low-Carbon Manufacturing, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, China
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15
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Zhou H, Chuang P, Xu L, Wu Q. Asymmetric Synthesis of Bulky N-Cyclopropylmethyl-1-aryl-1-phenylmethylamines Catalyzed by Engineered Imine Reductases. Org Lett 2023; 25:6688-6692. [PMID: 37671859 DOI: 10.1021/acs.orglett.3c02542] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/07/2023]
Abstract
Enzymatic reduction of diphenylmethanimine derivatives has rarely been reported owing to their steric hindrance. Herein, imine reductase (IRED) from Nocardia cyriacigeorgica rationally engineered with an efficient strategy of focused rational iterative site-specific mutagenesis (FRISM) was selected for the reduction of a series of N-cyclopropylmethyl-1-aryl-1-phenylmethylimines. Two highly enantioselective IRED variants were identified, providing various bulky amine products with moderate to high yields and high ee values (up to >99%). This work provided an effective method to construct these important pharmaceutical intermediates.
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Affiliation(s)
- Haonan Zhou
- Center of Chemistry for Frontier Technologies, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310058, P. R. China
| | - Peihsuan Chuang
- Center of Chemistry for Frontier Technologies, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310058, P. R. China
| | - Leyan Xu
- Center of Chemistry for Frontier Technologies, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310058, P. R. China
| | - Qi Wu
- Center of Chemistry for Frontier Technologies, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310058, P. R. China
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16
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Sharma M, Cuetos A, Willliams A, González-Martínez D, Grogan G. Structure of the imine reductase from Ajellomyces dermatitidis in three crystal forms. Acta Crystallogr F Struct Biol Commun 2023; 79:224-230. [PMID: 37581897 PMCID: PMC10478762 DOI: 10.1107/s2053230x23006672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 07/31/2023] [Indexed: 08/16/2023] Open
Abstract
The NADPH-dependent imine reductase from Ajellomyces dermatitidis (AdRedAm) catalyzes the reductive amination of certain ketones with amine donors supplied in an equimolar ratio. The structure of AdRedAm has been determined in three forms. The first form, which belongs to space group P3121 and was refined to 2.01 Å resolution, features two molecules (one dimer) in the asymmetric unit in complex with the redox-inactive cofactor NADPH4. The second form, which belongs to space group C21 and was refined to 1.73 Å resolution, has nine molecules (four and a half dimers) in the asymmetric unit, each complexed with NADP+. The third form, which belongs to space group P3121 and was refined to 1.52 Å resolution, has one molecule (one half-dimer) in the asymmetric unit. This structure was again complexed with NADP+ and also with the substrate 2,2-difluoroacetophenone. The different data sets permit the analysis of AdRedAm in different conformational states and also reveal the molecular basis of stereoselectivity in the transformation of fluorinated acetophenone substrates by the enzyme.
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Affiliation(s)
- Mahima Sharma
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
| | - Anibal Cuetos
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
| | - Adam Willliams
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
| | | | - Gideon Grogan
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
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17
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Abstract
The ability to site-selectively modify equivalent functional groups in a molecule has the potential to streamline syntheses and increase product yields by lowering step counts. Enzymes catalyze site-selective transformations throughout primary and secondary metabolism, but leveraging this capability for non-native substrates and reactions requires a detailed understanding of the potential and limitations of enzyme catalysis and how these bounds can be extended by protein engineering. In this review, we discuss representative examples of site-selective enzyme catalysis involving functional group manipulation and C-H bond functionalization. We include illustrative examples of native catalysis, but our focus is on cases involving non-native substrates and reactions often using engineered enzymes. We then discuss the use of these enzymes for chemoenzymatic transformations and target-oriented synthesis and conclude with a survey of tools and techniques that could expand the scope of non-native site-selective enzyme catalysis.
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Affiliation(s)
- Dibyendu Mondal
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Harrison M Snodgrass
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Christian A Gomez
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Jared C Lewis
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
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18
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Heckmann CM, Paul CE. Enantio-Complementary Synthesis of 2-Substituted Pyrrolidines and Piperidines via Transaminase-Triggered Cyclizations. JACS AU 2023; 3:1642-1649. [PMID: 37388678 PMCID: PMC10301811 DOI: 10.1021/jacsau.3c00103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 04/21/2023] [Accepted: 04/21/2023] [Indexed: 07/01/2023]
Abstract
Chiral N-heterocycles are a common motif in many active pharmaceutical ingredients; however, their synthesis often relies on the use of heavy metals. In recent years, several biocatalytic approaches have emerged to reach enantiopurity. Here, we describe the asymmetric synthesis of 2-substituted pyrrolidines and piperidines, starting from commercially available ω-chloroketones by using transaminases, which has not yet been comprehensively studied. Analytical yields of up to 90% and enantiomeric excesses of up to >99.5% for each enantiomer were achieved, which has not previously been shown for bulky substituents. This biocatalytic approach was applied to synthesize (R)-2-(p-chlorophenyl)pyrrolidine on a 300 mg scale, affording 84% isolated yield, with >99.5% ee.
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19
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Zhang J, Ma Y, Zhu F, Bao J, Wu Q, Gao SS, Cui C. Structure-guided semi-rational design of an imine reductase for enantio-complementary synthesis of pyrrolidinamine. Chem Sci 2023; 14:4265-4272. [PMID: 37123194 PMCID: PMC10132124 DOI: 10.1039/d2sc07014f] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Accepted: 03/03/2023] [Indexed: 05/02/2023] Open
Abstract
In this study, engineered imine reductases (IREDs) of IRED M5, originally from Actinoalloteichus hymeniacidonis, were obtained through structure-guided semi-rational design. By focusing on mutagenesis of the residues that directly interact with the ketone donor moiety, we identified two residues W234 and F260, playing essential roles in enhancing and reversing the stereoselectivity, respectively. Moreover, two completely enantio-complementary variants S241L/F260N (R-selectivity up to 99%) and I149D/W234I (S-selectivity up to 99%) were achieved. Both variants showed excellent stereoselectivity toward the tested substrates, offering valuable biocatalysts for synthesizing pyrrolidinamines. Its application was demonstrated in a short synthesis of the key intermediates of potential drug molecules leniolisib and JAK1 inhibitor 4, from cheap and commercially available pro-chiral N-Boc-piperidone 1 (2 and 3 steps, respectively).
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Affiliation(s)
- Jun Zhang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences Tianjin 300308 China
- School of Life Science, Hebei University Baoding 071002 China
| | - Yaqing Ma
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences Tianjin 300308 China
- CAS Key Laboratory of Microbial Physiological and Metabolic Engineering, State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences Beijing 100101 China
| | - Fangfang Zhu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences Tianjin 300308 China
- College of Biotechnology, Tianjin University of Science and Technology Tianjin 300457 China
| | - Jinping Bao
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences Tianjin 300308 China
| | - Qiaqing Wu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences Tianjin 300308 China
- National Technology Innovation Center of Synthetic Biology Tianjin 300308 China
| | - Shu-Shan Gao
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences Tianjin 300308 China
- National Technology Innovation Center of Synthetic Biology Tianjin 300308 China
| | - Chengsen Cui
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences Tianjin 300308 China
- National Technology Innovation Center of Synthetic Biology Tianjin 300308 China
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20
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France SP, Lewis RD, Martinez CA. The Evolving Nature of Biocatalysis in Pharmaceutical Research and Development. JACS AU 2023; 3:715-735. [PMID: 37006753 PMCID: PMC10052283 DOI: 10.1021/jacsau.2c00712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 02/13/2023] [Accepted: 02/13/2023] [Indexed: 06/19/2023]
Abstract
Biocatalysis is a highly valued enabling technology for pharmaceutical research and development as it can unlock synthetic routes to complex chiral motifs with unparalleled selectivity and efficiency. This perspective aims to review recent advances in the pharmaceutical implementation of biocatalysis across early and late-stage development with a focus on the implementation of processes for preparative-scale syntheses.
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21
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Gilio A, Thorpe TW, Heyam A, Petchey MR, Pogrányi B, France SP, Howard RM, Karmilowicz MJ, Lewis R, Turner N, Grogan G. A Reductive Aminase Switches to Imine Reductase Mode for a Bulky Amine Substrate. ACS Catal 2023; 13:1669-1677. [PMID: 36776386 PMCID: PMC9903292 DOI: 10.1021/acscatal.2c06066] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Indexed: 01/15/2023]
Abstract
Imine reductases (IREDs) catalyze the asymmetric reduction of cyclic imines, but also in some cases the coupling of ketones and amines to form secondary amine products in an enzyme-catalyzed reductive amination (RedAm) reaction. Enzymatic RedAm reactions have typically used small hydrophobic amines, but many interesting pharmaceutical targets require that larger amines be used in these coupling reactions. Following the identification of IR77 from Ensifer adhaerens as a promising biocatalyst for the reductive amination of cyclohexanone with pyrrolidine, we have characterized the ability of this enzyme to catalyze couplings with larger bicyclic amines such as isoindoline and octahydrocyclopenta(c)pyrrole. By comparing the activity of IR77 with reductions using sodium cyanoborohydride in water, it was shown that, while the coupling of cyclohexanone and pyrrolidine involved at least some element of reductive amination, the amination with the larger amines likely occurred ex situ, with the imine recruited from solution for enzyme reduction. The structure of IR77 was determined, and using this as a basis, structure-guided mutagenesis, coupled with point mutations selecting improving amino acid sites suggested by other groups, permitted the identification of a mutant A208N with improved activity for amine product formation. Improvements in conversion were attributed to greater enzyme stability as revealed by X-ray crystallography and nano differential scanning fluorimetry. The mutant IR77-A208N was applied to the preparative scale amination of cyclohexanone at 50 mM concentration, with 1.2 equiv of three larger amines, in isolated yields of up to 93%.
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Affiliation(s)
- Amelia
K. Gilio
- Department
of Chemistry, University of York, Heslington, York YO10 5DD, U.K.
| | - Thomas W. Thorpe
- School
of Chemistry, Manchester Institute of Biotechnology, University of Manchester, 131 Princess Street, Manchester M1 7DN, U.K.
| | - Alex Heyam
- Department
of Chemistry, University of York, Heslington, York YO10 5DD, U.K.
| | - Mark R. Petchey
- Department
of Chemistry, University of York, Heslington, York YO10 5DD, U.K.
| | - Balázs Pogrányi
- Department
of Chemistry, University of York, Heslington, York YO10 5DD, U.K.
| | - Scott P. France
- Pfizer
Worldwide Research and Development, 445 Eastern Point Road, Groton, Connecticut 06340, United States
| | - Roger M. Howard
- Pfizer
Worldwide Research and Development, 445 Eastern Point Road, Groton, Connecticut 06340, United States
| | - Michael J. Karmilowicz
- Pfizer
Worldwide Research and Development, 445 Eastern Point Road, Groton, Connecticut 06340, United States
| | - Russell Lewis
- Pfizer
Worldwide Research and Development, 445 Eastern Point Road, Groton, Connecticut 06340, United States
| | - Nicholas Turner
- School
of Chemistry, Manchester Institute of Biotechnology, University of Manchester, 131 Princess Street, Manchester M1 7DN, U.K.
| | - Gideon Grogan
- Department
of Chemistry, University of York, Heslington, York YO10 5DD, U.K.,
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22
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Cárdenas‐Fernández M, Roddan R, Carter EM, Hailes HC, Ward JM. The Discovery of Imine Reductases and their Utilisation for the Synthesis of Tetrahydroisoquinolines. ChemCatChem 2023; 15:e202201126. [PMID: 37081856 PMCID: PMC10107726 DOI: 10.1002/cctc.202201126] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 12/13/2022] [Indexed: 01/13/2023]
Abstract
Imine reductases (IREDs) are NADPH-dependent enzymes with significant biocatalytic potential for the synthesis of primary, secondary, and tertiary chiral amines. Their applications include the reduction of cyclic imines and the reductive amination of prochiral ketones. In this study, twenty-nine novel IREDs were revealed through genome mining. Imine reductase activities were screened at pH 7 and 9 and in presence of either NADPH or NADH; some IREDs showed good activities at both pHs and were able to accept both cofactors. IREDs with Asn and Glu at the key 187 residue showed preference for NADH. IREDs were also screened against a series of dihydroisoquinolines to synthesise tetrahydroisoquinolines (THIQs), bioactive alkaloids with a wide range of therapeutic properties. Selected IREDs showed high stereoselectivity, as well high THIQ yields (>90 %) when coupled to a glucose-6-phosphate dehydrogenase for NADPH cofactor recycling.
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Affiliation(s)
- Max Cárdenas‐Fernández
- Department of Biochemical Engineering University College London Gower Street, Bernard Katz Building London WC1E 6BT UK
- School of Biosciences University of Kent K ent CT2 7NJ UK
| | - Rebecca Roddan
- Department of Chemistry University College London 20 Gordon Street London WC1H 0AJ UK
| | - Eve M. Carter
- Department of Chemistry University College London 20 Gordon Street London WC1H 0AJ UK
| | - Helen C. Hailes
- Department of Chemistry University College London 20 Gordon Street London WC1H 0AJ UK
| | - John M. Ward
- Department of Biochemical Engineering University College London Gower Street, Bernard Katz Building London WC1E 6BT UK
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23
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M VNUM, Faidh MA, Chadha A. The ornithine cyclodeaminase/µ-crystallin superfamily of proteins: A novel family of oxidoreductases for the biocatalytic synthesis of chiral amines. CURRENT RESEARCH IN BIOTECHNOLOGY 2022. [DOI: 10.1016/j.crbiot.2022.09.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022] Open
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