June 1, 2018
Aliquots of the supernatants (20 ÎźL) were transferred from the master plates to two replica plates with the aid of a liquid handler robotic station Freedom EVO (Tecan, Switzerland).
Propranolol is a widely used beta-blocker that is metabolized by human liver P450 monooxygenases into equipotent hydroxylated human drug metabolites (HDMs). It is paramount for the pharmaceutical industry to evaluate the toxicity and activity of these metabolites, but unfortunately, their synthesis has hitherto involved the use of severe conditions, with poor reaction yields and unwanted byproducts. Unspecific peroxygenases (UPOs) catalyze the selective oxyfunctionalization of CâH bonds, and they are of particular interest in synthetic organic chemistry. Here, we describe the engineering of UPO from Agrocybe aegerita for the efficient synthesis of 5â˛-hydroxypropranolol (5â˛-OHP). We employed a structure-guided evolution approach combined with computational analysis, with the aim of avoiding unwanted phenoxyl radical coupling without having to dope the reaction with radical scavengers. The evolved biocatalyst showed a catalytic efficiency enhanced by 2 orders of magnitude and 99% regioselectivity for the synthesis of 5â˛-OHP. When the UPO mutant was combined with an H2O2 in situ generation system using methanol as sacrificial electron donor, total turnover numbers of up to 264 000 were achieved, offering a cost-effective and readily scalable method to rapidly prepare 5â˛-OHP.
Gomez de Santos, P; CaĂąellas, M; Tieves, F; Younes, S; Molina-Espeja, P; Hofrichter, M; Hollmann, F; Guallar, V; Alcalde, M;
Journal: ACS Catal. Pages: 4789-4799