Steitz JP, Krug L, Walter L, Hernández K, Röhr C, Clapés P, Müller M. Unifying Scheme for the Biosynthesis of Acyl-Branched Sugars: Extended Substrate Scope of Thiamine-Dependent Enzymes.
Angew Chem Int Ed Engl 2022;
61:e202113405. [PMID:
35092140 PMCID:
PMC9306805 DOI:
10.1002/anie.202113405]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Indexed: 12/19/2022]
Abstract
Thiamine diphosphate (ThDP) dependent enzymes are useful catalysts for asymmetric C−C bond formation through benzoin‐type condensation reactions that result in α‐hydroxy ketones. A wide range of aldehydes and ketones can be used as acceptor substrates; however, the donor substrate range is mostly limited to achiral α‐keto acids and simple aldehydes. By using a unifying retro‐biosynthetic approach towards acyl‐branched sugars, we identified a subclass of (myco)bacterial ThDP‐dependent enzymes with a greatly extended donor substrate range, namely functionalized chiral α‐keto acids with a chain length from C4 to C8. Highly enantioenriched acyloin products were obtained in good to high yields and several reactions were performed on a preparative scale. The newly introduced functionalized α‐keto acids, accessible by known aldolase‐catalyzed transformations, substantially broaden the donor substrate range of ThDP‐dependent enzymes, thus enabling a more general use of these already valuable catalysts.
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