1
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Sugunan A, Aparna VM, Rajendar G. Phosphonium Ion-Tethered Secondary Amines for Chemospecific 5- Enolexo Aldol Condensations of 6-Ketoaldehydes. J Org Chem 2023. [PMID: 38014421 DOI: 10.1021/acs.joc.3c02285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
A novel and highly selective 5-enolexo-exo-trig aldol condensation of 6-ketoaldehydes is presented using a proline-based alkylphosphonium ion catalyst. Bulky and oxophilic phosphonium ion plays a vital role in facilitating kinetic aldenamine formation and activating keto groups for aldol addition. This innovative approach exclusively targets five-membered carbo- and heterocyclic aldehydes, involving unusual aldehydes as donors and ketones as acceptors. Especially, enolizable aryl keto aldehydes and heteroatom-embedded ketoaldehydes exclusively produced cyclized products with our new catalyst, while other catalysts provided predominantly self-aldol or decomposed products. The scope and diversity of the method demonstrated by synthesizing different carboxaldehydes, including cyclopentene, indene, dihydrofuran, benzofuran, dihydropyrrole, indole, thiofuran, dihydrothiofuran, and benzothiofurans.
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Affiliation(s)
- Akash Sugunan
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala 695551, India
| | - V M Aparna
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala 695551, India
| | - Goreti Rajendar
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala 695551, India
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2
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Xu G, Poelarends GJ. Unlocking New Reactivities in Enzymes by Iminium Catalysis. Angew Chem Int Ed Engl 2022; 61:e202203613. [PMID: 35524737 PMCID: PMC9400869 DOI: 10.1002/anie.202203613] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Indexed: 12/11/2022]
Abstract
The application of biocatalysis in conquering challenging synthesis requires the constant input of new enzymes. Developing novel biocatalysts by absorbing catalysis modes from synthetic chemistry has yielded fruitful new-to-nature enzymes. Organocatalysis was originally bio-inspired and has become the third pillar of asymmetric catalysis. Transferring organocatalytic reactions back to enzyme platforms is a promising approach for biocatalyst creation. Herein, we summarize recent developments in the design of novel biocatalysts that adopt iminium catalysis, a fundamental branch in organocatalysis. By repurposing existing enzymes or constructing artificial enzymes, various biocatalysts for iminium catalysis have been created and optimized via protein engineering to promote valuable abiological transformations. Recent advances in iminium biocatalysis illustrate the power of combining chemomimetic biocatalyst design and directed evolution to generate useful new-to-nature enzymes.
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Affiliation(s)
- Guangcai Xu
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713, AV Groningen, The Netherlands
| | - Gerrit J Poelarends
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713, AV Groningen, The Netherlands
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3
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Xu G, Poelarends GJ. Unlocking New Reactivities in Enzymes by Iminium Catalysis. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202203613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Guangcai Xu
- University of Groningen: Rijksuniversiteit Groningen Chemical and Pharmaceutical Biology NETHERLANDS
| | - Gerrit J. Poelarends
- University of Groningen Chemical and Pharmaceutical Biology Antonius Deusinglaan 1 9713 AV Groningen NETHERLANDS
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4
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Cornelio J, Telfer S. Tuning the Stereoselectivity of an Intramolecular Aldol Reaction by Precisely Modifying a Metal-Organic Framework Catalyst. Chem Asian J 2022; 17:e202200243. [PMID: 35466580 PMCID: PMC9323468 DOI: 10.1002/asia.202200243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 03/30/2022] [Indexed: 11/17/2022]
Abstract
We report the catalysis of an enantioselective, intramolecular aldol reaction accelerated by an organocatalyst embedded in a series of multicomponent metal‐organic frameworks. By precisely programming the pore microenvironment around the site of catalysis, we show how important features of an intramolecular aldol reaction can be tuned, such as the substrate consumption, enantioselectivity, and degree of dehydration of the products. This tunability arises from non‐covalent interactions between the reaction participants and modulator groups that occupy positions in the framework remote from the catalytic site. Further, the catalytic moiety can be switched form one framework linker to another. Deliberately building up microenvironments that can influence the outcome of reaction processes in this way is not possible in conventional homogenous catalysts but is reminiscent of enzymes.
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Affiliation(s)
- Joel Cornelio
- Massey University, School of Fundamental Sciences, NEW ZEALAND
| | - Shane Telfer
- Massey University, IFS - Chemistry, PO Box 11 222, 4442, Palmerston North, NEW ZEALAND
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5
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Abstract
The traditional end-to-end cyclization of long-chain linear precursors is difficult and often unpredictable because the unfavorable entropy of macrocyclic closure allows undesired intermolecular reactions to compete. Here, we apply cavitands to the selective intramolecular aldol/dehydration reaction of long-chain α,ω-dialdehydes in aqueous solution. Hydrophobic forces drive the dialdehydes into the cavitands in folded conformations and favor macrocyclization reactions over intermolecular reactions observed in bulk solution. The macrocyclic aldol reaction products are isolated in good yields (30-85%) over a wide range (11 to 17-membered rings). Unlike conventional templates that become guests inside their assembled hosts, cavitands reverse the roles and resemble the situation in biological catalysis-the templates are hosts for guests undergoing the assisted reaction processes.
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Affiliation(s)
- Ji-Min Yang
- Skaggs Institute for Chemical Biology and Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Yang Yu
- Center for Supramolecular Chemistry & Catalysis and Department of Chemistry, College of Science, Shanghai University, 99 Shang-Da Road, Shanghai 200444, China
| | - Julius Rebek
- Skaggs Institute for Chemical Biology and Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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6
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Xu G, Crotti M, Saravanan T, Kataja KM, Poelarends GJ. Enantiocomplementary Epoxidation Reactions Catalyzed by an Engineered Cofactor-Independent Non-natural Peroxygenase. Angew Chem Int Ed Engl 2020; 59:10374-10378. [PMID: 32160395 PMCID: PMC7317984 DOI: 10.1002/anie.202001373] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 03/06/2020] [Indexed: 11/29/2022]
Abstract
Peroxygenases are heme-dependent enzymes that use peroxide-borne oxygen to catalyze a wide range of oxyfunctionalization reactions. Herein, we report the engineering of an unusual cofactor-independent peroxygenase based on a promiscuous tautomerase that accepts different hydroperoxides (t-BuOOH and H2 O2 ) to accomplish enantiocomplementary epoxidations of various α,β-unsaturated aldehydes (citral and substituted cinnamaldehydes), providing access to both enantiomers of the corresponding α,β-epoxy-aldehydes. High conversions (up to 98 %), high enantioselectivity (up to 98 % ee), and good product yields (50-80 %) were achieved. The reactions likely proceed via a reactive enzyme-bound iminium ion intermediate, allowing tweaking of the enzyme's activity and selectivity by protein engineering. Our results underscore the potential of catalytic promiscuity for the engineering of new cofactor-independent oxidative enzymes.
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Affiliation(s)
- Guangcai Xu
- Department of Chemical and Pharmaceutical BiologyGroningen Research Institute of PharmacyUniversity of GroningenAntonius Deusinglaan 19713AVGroningenThe Netherlands
| | - Michele Crotti
- Department of Chemical and Pharmaceutical BiologyGroningen Research Institute of PharmacyUniversity of GroningenAntonius Deusinglaan 19713AVGroningenThe Netherlands
| | - Thangavelu Saravanan
- Department of Chemical and Pharmaceutical BiologyGroningen Research Institute of PharmacyUniversity of GroningenAntonius Deusinglaan 19713AVGroningenThe Netherlands
- Present address: School of ChemistryUniversity of HyderabadP.O. Central University, GachibowliHyderabad500046India
| | - Kim M. Kataja
- Department of Chemical and Pharmaceutical BiologyGroningen Research Institute of PharmacyUniversity of GroningenAntonius Deusinglaan 19713AVGroningenThe Netherlands
| | - Gerrit J. Poelarends
- Department of Chemical and Pharmaceutical BiologyGroningen Research Institute of PharmacyUniversity of GroningenAntonius Deusinglaan 19713AVGroningenThe Netherlands
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7
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Santi N, Morrill LC, Luk LYP. Streptavidin-Hosted Organocatalytic Aldol Addition. Molecules 2020; 25:E2457. [PMID: 32466220 PMCID: PMC7287710 DOI: 10.3390/molecules25102457] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 05/18/2020] [Accepted: 05/20/2020] [Indexed: 12/27/2022] Open
Abstract
In this report, the streptavidin-biotin technology was applied to enable organocatalytic aldol addition. By attaching pyrrolidine to the valeric motif of biotin and introducing it to streptavidin (Sav), a protein-based organocatalytic system was created, and the aldol addition of acetone with p-nitrobenzaldehyde was tested. The conversion of substrate to product can be as high as 93%. Although the observed enantioselectivity was only moderate (33:67 er), further protein engineering efforts can be included to improve the selectivity. These results have proven the concept that Sav can be used to host stereoselective aldol addition.
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Affiliation(s)
- Nicolò Santi
- School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT, UK; (N.S.); (L.C.M.)
| | - Louis C. Morrill
- School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT, UK; (N.S.); (L.C.M.)
- Cardiff Catalysis Institute, School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT, UK
| | - Louis Y. P. Luk
- School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT, UK; (N.S.); (L.C.M.)
- Cardiff Catalysis Institute, School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT, UK
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8
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Nödling AR, Santi N, Williams TL, Tsai YH, Luk LYP. Enabling protein-hosted organocatalytic transformations. RSC Adv 2020; 10:16147-16161. [PMID: 33184588 PMCID: PMC7654312 DOI: 10.1039/d0ra01526a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 03/25/2020] [Indexed: 12/30/2022] Open
Abstract
In this review, the development of organocatalytic artificial enzymes will be discussed. This area of protein engineering research has underlying importance, as it enhances the biocompatibility of organocatalysis for applications in chemical and synthetic biology research whilst expanding the catalytic repertoire of enzymes. The approaches towards the preparation of organocatalytic artificial enzymes, techniques used to improve their performance (selectivity and reactivity) as well as examples of their applications are presented. Challenges and opportunities are also discussed.
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Affiliation(s)
- Alexander R Nödling
- School of Chemistry, Cardiff University, Main Building, Cardiff, CF10 3AT, UK.
| | - Nicolò Santi
- School of Chemistry, Cardiff University, Main Building, Cardiff, CF10 3AT, UK.
| | - Thomas L Williams
- School of Chemistry, Cardiff University, Main Building, Cardiff, CF10 3AT, UK.
| | - Yu-Hsuan Tsai
- School of Chemistry, Cardiff University, Main Building, Cardiff, CF10 3AT, UK.
| | - Louis Y P Luk
- School of Chemistry, Cardiff University, Main Building, Cardiff, CF10 3AT, UK.
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9
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Xu G, Crotti M, Saravanan T, Kataja KM, Poelarends GJ. Enantiocomplementary Epoxidation Reactions Catalyzed by an Engineered Cofactor‐Independent Non‐natural Peroxygenase. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202001373] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Guangcai Xu
- Department of Chemical and Pharmaceutical Biology Groningen Research Institute of Pharmacy University of Groningen Antonius Deusinglaan 1 9713 AV Groningen The Netherlands
| | - Michele Crotti
- Department of Chemical and Pharmaceutical Biology Groningen Research Institute of Pharmacy University of Groningen Antonius Deusinglaan 1 9713 AV Groningen The Netherlands
| | - Thangavelu Saravanan
- Department of Chemical and Pharmaceutical Biology Groningen Research Institute of Pharmacy University of Groningen Antonius Deusinglaan 1 9713 AV Groningen The Netherlands
- Present address: School of Chemistry University of Hyderabad P.O. Central University, Gachibowli Hyderabad 500046 India
| | - Kim M. Kataja
- Department of Chemical and Pharmaceutical Biology Groningen Research Institute of Pharmacy University of Groningen Antonius Deusinglaan 1 9713 AV Groningen The Netherlands
| | - Gerrit J. Poelarends
- Department of Chemical and Pharmaceutical Biology Groningen Research Institute of Pharmacy University of Groningen Antonius Deusinglaan 1 9713 AV Groningen The Netherlands
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10
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Saifuddin M, Guo C, Biewenga L, Saravanan T, Charnock SJ, Poelarends GJ. Enantioselective Aldol Addition of Acetaldehyde to Aromatic Aldehydes Catalyzed by Proline-Based Carboligases. ACS Catal 2020; 10:2522-2527. [PMID: 32117575 PMCID: PMC7045556 DOI: 10.1021/acscatal.0c00039] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Revised: 01/27/2020] [Indexed: 01/22/2023]
Abstract
![]()
Aromatic
β-hydroxyaldehydes, 1,3-diols, and α,β-unsaturated
aldehydes are valuable precursors to biologically active natural products
and drug molecules. Herein we report the biocatalytic aldol condensation
of acetaldehyde with various aromatic aldehydes to give a number of
aromatic α,β-unsaturated aldehydes using a previously
engineered variant of 4-oxalocrotonate tautomerase [4-OT(M45T/F50A)]
as carboligase. Moreover, an efficient one-pot two-step chemoenzymatic
route toward chiral aromatic 1,3-diols has been developed. This one-pot
chemoenzymatic strategy successfully combined a highly enantioselective
aldol addition step catalyzed by a proline-based carboligase [4-OT(M45T/F50A)
or TAUT015] with a chemical reduction step to convert enzymatically
prepared aromatic β-hydroxyaldehydes into the corresponding
1,3-diols with high optical purity (e.r. up to >99:1) and in good
isolated yield (51–92%). These developed (chemo)enzymatic methodologies
offer alternative synthetic choices to prepare a variety of important
drug precursors.
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Affiliation(s)
- Mohammad Saifuddin
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Chao Guo
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Lieuwe Biewenga
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Thangavelu Saravanan
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Simon J. Charnock
- Prozomix Ltd., Station Court, Haltwhistle, Northumberland NE49 9HN, U.K
| | - Gerrit J. Poelarends
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
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11
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Abstract
Amide rotation of peptidyl-prolyl fragments is an important factor in backbone structure organization of proteins. Computational studies have indicated that this rotation preferentially proceeds through a defined transition-state structure (syn/exo). Here, we complement the computational findings by determining the amide bond rotation barriers for derivatives of the two symmetric proline analogues, meso and racemic pyrrolidine-2,5-dicarboxylic acids. The rotations around these residues represent syn/exo-syn/exo and anti/endo-syn/exo hybrid transition states for the meso and racemic diastereomer, respectively. The rotation barriers are lower for the former rotation by about 9 kJ mol-1 (aqueous medium), suggesting a strong preference for the syn/exo (clockwise) rotation over the anti/endo (anticlockwise) rotation. The results show that both hybrid rotation processes are enthalpically driven but respond differently to solvent polarity changes due to the different transition state dipole-dipole interactions.
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Affiliation(s)
- Vladimir Kubyshkin
- Biocatalysis Group, Institute of Chemistry, Technical University of Berlin, Müller-Breslau-Str. 10, Berlin 10623, Germany.
| | - Nediljko Budisa
- Biocatalysis Group, Institute of Chemistry, Technical University of Berlin, Müller-Breslau-Str. 10, Berlin 10623, Germany.
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12
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In situ determination of potential-driven structural changes in a redox-active plumbagin polymer film on a glassy carbon electrode using PM IRRAS under electrochemical control. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.09.152] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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Rahimi M, van der Meer J, Geertsema EM, Poelarends GJ. Engineering a Promiscuous Tautomerase into a More Efficient Aldolase for Self-Condensations of Linear Aliphatic Aldehydes. Chembiochem 2017; 18:1435-1441. [PMID: 28426139 PMCID: PMC5575498 DOI: 10.1002/cbic.201700121] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Indexed: 01/04/2023]
Abstract
The enzyme 4-oxalocrotonate tautomerase (4-OT) from Pseudomonas putida mt-2 takes part in a catabolic pathway for aromatic hydrocarbons, where it catalyzes the conversion of 2hydroxyhexa-2,4-dienedioate into 2-oxohexa-3-enedioate. This tautomerase can also promiscuously catalyze carbon-carbon bond-forming reactions, including various types of aldol reactions, by using its amino-terminal proline as a key catalytic residue. Here, we used systematic mutagenesis to identify two hotspots in 4-OT (Met45 and Phe50) at which single mutations give marked improvements in aldolase activity for the self-condensation of propanal. Activity screening of a focused library in which these two hotspots were varied led to the discovery of a 4-OT variant (M45Y/F50V) with strongly enhanced aldolase activity in the self-condensation of linear aliphatic aldehydes, such as acetaldehyde, propanal, and butanal, to yield α,β-unsaturated aldehydes. With both propanal and benzaldehyde, this double mutant, unlike the previously constructed single mutant F50A, mainly catalyzes the self-condensation of propanal rather than the cross-condensation of propanal and benzaldehyde, thus indicating that it indeed has altered substrate specificity. This variant could serve as a template to create new biocatalysts that lack dehydration activity and possess further enhanced aldolase activity, thus enabling the efficient enzymatic self-coupling of aliphatic aldehydes.
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Affiliation(s)
- Mehran Rahimi
- Department of Chemical and Pharmaceutical BiologyGroningen Research Institute of PharmacyUniversity of GroningenAntonius Deusinglaan 19713 AVGroningenThe Netherlands
| | - Jan‐Ytzen van der Meer
- Department of Chemical and Pharmaceutical BiologyGroningen Research Institute of PharmacyUniversity of GroningenAntonius Deusinglaan 19713 AVGroningenThe Netherlands
| | - Edzard M. Geertsema
- Department of Chemical and Pharmaceutical BiologyGroningen Research Institute of PharmacyUniversity of GroningenAntonius Deusinglaan 19713 AVGroningenThe Netherlands
- Present address: Institute for Life Science and TechnologyHanze University of Applied SciencesZernikeplein 119747 ASGroningenThe Netherlands
| | - Gerrit J. Poelarends
- Department of Chemical and Pharmaceutical BiologyGroningen Research Institute of PharmacyUniversity of GroningenAntonius Deusinglaan 19713 AVGroningenThe Netherlands
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