Abstract

Abstract Nitrilases have long been considered as an attractive alternative to chemical catalyst in carboxylic acids biosynthesis due to their green characteristics and the catalytic potential in nitrile hydrolysis. A novel nitrilase from Pseudomonas putida CGMCC3830 was purified to homogeneity. pI value was estimated to be 5.2 through two-dimensional electrophoresis. The amino acid sequence of NH2 terminus was determined. Nitrilase gene was cloned through CODEHOP PCR, Degenerate PCR and TAIL-PCR. The open reading frame consisted of 1113 bp encoding a protein of 370 amino acids. The predicted amino acid sequence showed the highest identity (61.6%) to nitrilase from Rhodococcus rhodochrous J1. The enzyme was highly specific toward aromatic nitriles such as 3-cyanopyridine, 4-cyanopyridine, and 2-chloro-4-cyanopyridine. It was classified as aromatic nitrilase. The nitrilase activity could reach up to 71.8 U/mg with 3-cyanopyridine as substrate, which was a prominent level among identified cyanopyridine converting enzymes. The kinetic parameters Km and Vmax for 3-cyanopyridine were 27.9 mM and 84.0 U/mg, respectively. These data would warrant it as a novel and potential candidate for creating effective nitrilases in catalytic applications of carboxylic acids synthesis through further protein engineering.

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