화학공학소재연구정보센터
Biotechnology Letters, Vol.42, No.12, 2643-2651, 2020
Enantioselective synthesis of a chiral intermediate of himbacine analogs byBurkholderia cepacialipase A
The enantiomers of (4R/S)-4-hydroxy-N,N-diphenyl-2-pentynamide are key chiral synthons for the synthesis of thrombin receptor antagonists such as vorapaxar. In this paper, we report the enzymatic preparation of enantiomerically enriched (4R)-4-hydroxy-N,N-diphenyl-2-pentynamide using lipase A fromBurkholderia cepaciaATCC 25416 as the catalyst. First, the lipase gene (lipA) and its chaperone gene (lipB) was cloned and expressed inEscherichia colisystem. After purification, lipase A activation was performed with the assistance of foldase lipase B. Enzyme assay revealed that the activated lipase A showed the optimal catalytic activity at 60 oC and pH 7. The effects of various metals on the activity were investigated and results demonstrated that most of the metals inhibited the activity. To further improve the catalytic outcome, two-phase reaction was studied, andn-hexane proved to be a good organic solvent for the combination system. Using the optimize conditions, (4R)-4-hydroxy-N,N-diphenyl-2-pentynamide with 94.5% ee value and 48.93% conversion ratio was achieved. Our investigation on this lipase reveals lipase A as a promising biocatalyst for producing chiral propargyl alcohol for preparation of novel himbacine analogs.