Characterization of a newly isolated strain Rhodococcus erythropolis ZJB-09149 transforming 2-chloro-3-cyanopyridine to 2-chloronicotinic acid

Abstract

2-Chloronicotinic acid is receiving much attention for its effective applications as a key precursor in the synthesis of pesticides and medicines. In this study, a strain ZJB-09149 converting 2-chloro-3-cyanopyridine to 2-chloronicotinic acid was newly isolated and identified as Rhodococcus erythropolis, based on its physiological and biological tests, and 16S rDNA sequence analysis. In addition, the effects of inducer, carbon source and nitrogen source were examined. Maximum activity was achieved when the above parameters were set as 8 g/l ɛ-caprolactam, 7 g/l yeast extract and 5 g/l maltose. Moreover, the biotransformation pathway of 2-chloro-3-cyanopyridine to 2-chloronicotinic acid in strain ZJB-09149 was investigated as well. This study revealed that the nitrile hydratase (NHase) and amidase expressed in R. erythropolis ZJB-09149 are responsible for the conversion of 2-chloro-3-cyanopyridine. This is the first time to report on the biotransformation preparation of 2-chloronicotinic acid.