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| Home > Publications database > Multi-enzyme catalysed processes using purified and whole-cell biocatalysts towards a 1,3,4-substituted tetrahydroisoquinoline > print |
| 001 | 1006586 | ||
| 005 | 20231027114400.0 | ||
| 024 | 7 | _ | |a 10.1039/D3RA01210G |2 doi |
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| 100 | 1 | _ | |a Weber, Douglas |0 P:(DE-Juel1)174463 |b 0 |
| 245 | _ | _ | |a Multi-enzyme catalysed processes using purified and whole-cell biocatalysts towards a 1,3,4-substituted tetrahydroisoquinoline |
| 260 | _ | _ | |a London |c 2023 |b RSC Publishing |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 336 | 7 | _ | |a Journal Article |0 0 |2 EndNote |
| 520 | _ | _ | |a In this work, two multi-enzyme catalysed processes to access a 1,3,4-substituted tetrahydroisoquinoline (THIQ), using either purified enzymes or lyophilised whole-cell catalysts, are presented. A key focus was the first step in which the reduction of 3-hydroxybenzoic acid (3-OH-BZ) into 3-hydroxybenzaldehyde (3-OH-BA) was catalysed by a carboxylate reductase (CAR) enzyme. Incorporation of the CAR-catalysed step enables substituted benzoic acids as the aromatic components, which can potentially be obtained from renewable resources by microbial cell factories. In this reduction, the implementation of an efficient cofactor regeneration system of both ATP and NADPH was crucial. Two different recycling approaches, either using purified enzymes or lyophilised whole-cells, were established and compared. Both of them showed high conversions of the acid into 3-OH-BA (>80%). However, the whole-cell system showed superior performance because it allowed the combination of the first and second steps into a one-pot cascade with excellent HPLC yields (>99%, enantiomeric excess (ee) ≥ 95%) producing the intermediate 3-hydroxyphenylacetylcarbinol. Moreover, enhanced substrate loads could be achieved compared to the system employing only purified enzymes. The third and fourth steps were performed in a sequential mode to avoid cross-reactivities and the formation of several side products. Thus, (1R,2S)-metaraminol could be formed with high HPLC yields (>90%, isomeric content (ic) ≥ 95%) applying either purified or whole-cell transaminases from Bacillus megaterium (BmTA) or Chromobacterium violaceum (Cv2025). Finally, the cyclisation step was performed using either a purified or lyophilised whole-cell norcoclaurine synthase variant from Thalictrum flavum (ΔTfNCS-A79I), leading to the formation of the target THIQ product with high HPLC yields (>90%, ic > 90%). As many of the educts applied are from renewable resources and a complex product with three chiral centers can be gained by only four highly selective steps, a very step- and atom efficient approach to stereoisomerically pure THIQ is shown. |
| 536 | _ | _ | |a 2172 - Utilization of renewable carbon and energy sources and engineering of ecosystem functions (POF4-217) |0 G:(DE-HGF)POF4-2172 |c POF4-217 |f POF IV |x 0 |
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| 700 | 1 | _ | |a de Souza Bastos, Lucas |0 P:(DE-Juel1)186708 |b 1 |
| 700 | 1 | _ | |a Winkler, Margit |0 0000-0002-0754-9704 |b 2 |
| 700 | 1 | _ | |a Ni, Yeke |0 P:(DE-HGF)0 |b 3 |
| 700 | 1 | _ | |a Aliev, Abil E. |0 P:(DE-HGF)0 |b 4 |
| 700 | 1 | _ | |a Hailes, Helen C. |0 0000-0001-5574-4742 |b 5 |
| 700 | 1 | _ | |a Rother, Doerte |0 P:(DE-Juel1)144643 |b 6 |e Corresponding author |
| 773 | _ | _ | |a 10.1039/D3RA01210G |g Vol. 13, no. 15, p. 10097 - 10109 |0 PERI:(DE-600)2623224-8 |n 15 |p 10097 - 10109 |t RSC Advances |v 13 |y 2023 |x 2046-2069 |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/1006586/files/Invoice_INV_025167.pdf |
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