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Whole cells and cell extracts of Pseudomonas putida grown in a medium containing ammonium mandelate have the capacity to produce the acyloin compound 2-hydroxypropiophenone when incubated with benzoylformate and acetaldehyde. Benzaldehyde and benzyl alcohol were formed as reaction by-products. The enantiomeric excess of the 2-hydroxypropiophenone product was found to be 91 to 92%. The absolute configuration of the enzymatically prepared product at the carbinol carbon was found to be S. The thiamine PPi-linked enzyme benzoylformate decarboxylase, purified to give a single protein band on polyacrylamide gel electrophoresis, was shown to be responsible for the catalysis of this novel condensation reaction.
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Biochemistry,
R Wilcocks, and
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Biotechnology and bioengineering,
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Protein engineering,
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Bioscience, biotechnology, and biochemistry,
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Chirality,
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Applied and environmental microbiology,
