4.8 Article

Cleavage of Aliphatic a-Hydroxy Ketones by Evolved Transketolase from Geobacillus stearothermophilus

Journal

ACS CATALYSIS
Volume -, Issue -, Pages -

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acscatal.1c051403566

Keywords

biocatalysis; transketolase; C-C bond cleavage; mutagenesis; a-hydroxy ketones

Funding

  1. Auvergne Rhone-Alpes Region through the Pack Ambition Recherche VALCOUPENZ [1701105201-61617]
  2. ERA CoBioTech TRALAMINOL [64]

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Thermostable transketolase variants from Geobacillus stearothermophilus obtained through rational design can be used in vitro to cleave aliphatic alpha-hydroxy ketones, with high activity and yield.
The reaction catalyzed by ubiquitous thiamine pyrophosphate-dependent transketolase engaged in cells in the pentose phosphate pathway can be applied in vitro to the cleavage of aliphatic alpha-hydroxy ketones with thermostable transketolase variants from Geobacillus stearothermophilus obtained through rational design. The simple variant F435I gave the best activity toward (3S)-1,3-dihydroxyhexan-2-one 3, leading to the correspond-ing product with 92% yield after only 2 h of reaction time. Three triple variants H102L/H474 (S, G, or A)/F118I were found to cleave (+/-)-4-hydroxyhexan-3-one 6, giving the corresponding product with 90, 82, and 79% yield, respectively, after 24 h, whereas wild-type transketolase was almost ineffective. This biocatalytic strategy offers a promising one-step alternative to other multienzyme or chemical ways for the cleavage of aliphatic alpha-hydroxy ketones.

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