Biocatalytic Synthesis of Moclobemide Using the Amide Bond Synthetase McbA Coupled with an ATP Recycling System
| Autor: | Richard C. Lloyd, Benjamin Rowlinson, Ian J. S. Fairlamb, Gideon Grogan, Mark R. Petchey |
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| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Letter biocatalysis cofactor recycling 010405 organic chemistry Methylamine Carboxylic acid McbA General Chemistry 010402 general chemistry 01 natural sciences Combinatorial chemistry Catalysis Pyrrolidine 0104 chemical sciences amides ATP chemistry.chemical_compound chemistry Morpholine Amide Peptide bond Amine gas treating Piperidine |
| Zdroj: | ACS Catalysis |
| ISSN: | 2155-5435 |
| Popis: | The biocatalytic synthesis of amides from carboxylic acids and primary amines in aqueous media can be achieved using the ATP-dependent amide bond synthetase McbA, via an adenylate intermediate, using only 1.5 equiv of the amine nucleophile. Following earlier studies that characterized the broad carboxylic acid specificity of McbA, we now show that, in addition to the natural amine substrate 2-phenylethylamine, a range of simple aliphatic amines, including methylamine, butylamine, and hexylamine, and propargylamine are coupled efficiently to the native carboxylic acid substrate 1-acetyl-9H-β-carboline-3-carboxylic acid by the enzyme, to give amide products with up to >99% conversion. The structure of wild-type McbA in its amidation conformation, coupled with modeling and mutational studies, reveal an amine access tunnel and a possible role for residue D201 in amine activation. Amide couplings were slower with anilines and alicyclic secondary amines such as pyrrolidine and piperidine. The broader substrate specificity of McbA was exploited in the synthesis of the monoamine oxidase A inhibitor moclobemide, through the reaction of 4-chlorobenzoic acid with 1.5 equiv of 4-(2-aminoethyl)morpholine, and utilizing polyphosphate kinases SmPPK and AjPPK in the presence of polyphosphoric acid and 0.1 equiv of ATP, required for recycling of the cofactor. |
| Databáze: | OpenAIRE |
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