Open AccessAtropselective Hydrolysis of Chiral Binol-Phosphate Esters Catalyzed by the Phosphotriesterase from Sphingobium sp. TCM1
Author(s) -
Dao Feng Xiang,
Tamari Narindoshvili,
Frank M. Raushel
Publication year - 2020
Publication title -
biochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.43
H-Index - 253
eISSN - 1520-4995
pISSN - 0006-2960
DOI - 10.1021/acs.biochem.0c00831
Subject(s) - chemistry , hydrolysis , phosphate , enantiomer , organic chemistry , catalysis , tris , enzyme , triphenyl phosphate , stereoselectivity , medicinal chemistry , stereochemistry , biochemistry , fire retardant
The phosphotriesterase from Sphingobium sp. TCM1 ( Sb -PTE) is notable for its ability to hydrolyze a broad spectrum of organophosphate triesters, including organophosphorus flame retardants and plasticizers such as triphenyl phosphate and tris(2-chloroethyl) phosphate that are not substrates for other enzymes. This enzyme is also capable of hydrolyzing any one of the three ester groups attached to the central phosphorus core. The enantiomeric isomers of 1,1'-bi-2-naphthol (BINOL) have become among the most widely used chiral auxiliaries for the chemical synthesis of chiral carbon centers. PTE was tested for its ability to hydrolyze a series of biaryl phosphate esters, including mono- and bis-phosphorylated BINOL derivatives and cyclic phosphate triesters. Sb -PTE was shown to be able to catalyze the hydrolysis of the chiral phosphate triesters with significant stereoselectivity. The catalytic efficiency, k cat / K m , of Sb -PTE toward the test phosphate triesters ranged from ∼10 to 10 5 M -1 s -1 . The product ratios and stereoselectivities were determined for four pairs of phosphorylated BINOL derivatives.